JP2015079799A - Power generation monitoring device and power generation monitoring system - Google Patents

Abstract

A power generation monitoring apparatus capable of improving the communication accuracy of data communication is provided. A power generation monitoring apparatus for monitoring a solar cell string in which a solar cell module or a plurality of solar cell modules are connected in series via a power line, and acquiring power generation information of the solar cell module or solar cell string And a wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit. The power generation monitoring device is disposed at a position where the signal strength of the communication signal communicated by the wireless communication unit is equal to or greater than a predetermined value. [Selection] Figure 2

Description

  The present invention relates to a power generation monitoring device and a power generation monitoring system.

  2. Description of the Related Art Conventionally, solar power generation that uses solar power generation panels (PV (Photo Voltaic) panels) to convert solar energy into electrical energy has been widespread. In solar power generation, waste, drainage, noise, vibration, and the like are not generated during power generation, and are expected to be used as an emergency power source.

  As a conventional solar power generation system, a system in which a plurality of solar cell strings in which a plurality of solar power generation modules are connected in series is provided, and a backflow prevention diode is connected to each power output end of the plurality of solar cell strings is known. . Further, as an abnormality detection device for detecting an abnormality in the solar power generation system, a measurement unit that measures a current flowing through the backflow prevention diode and a wireless communication unit that wirelessly transmits the measured data to the central information management device are provided. An apparatus is known (see, for example, Patent Document 1).

JP 2010-263027 A

  In the abnormality detection device described in Patent Document 1, the communication accuracy of data communication is insufficient.

  The present invention has been made in view of the above circumstances, and provides a power generation monitoring device and a power generation monitoring system capable of improving the communication accuracy of data communication.

  The power generation monitoring device of the present invention is a power generation monitoring device that monitors a solar cell module or a solar cell string in which a plurality of solar cell modules are connected in series via a power line, and includes the solar cell module or the solar cell string. An acquisition unit that acquires power generation information; and a wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit, wherein the power generation monitoring device has a signal strength of a communication signal communicated by the wireless communication unit. It is arranged at a position that is equal to or greater than a predetermined value.

  The power generation monitoring system of the present invention is a power generation monitoring system comprising a plurality of power generation monitoring devices that monitor a solar cell module or a solar cell string in which a plurality of solar cell modules are connected in series via a power line. Includes an acquisition unit that acquires power generation information of the solar cell module or the solar cell string, and a wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit, and each power generation monitoring device includes the wireless The communication signal communicated by the communication unit is intensively arranged at a position where the signal intensity is a predetermined value or more.

  According to the present invention, the communication accuracy of data communication can be improved.

The schematic diagram which shows the structural example of the solar energy power generation system in 1st Embodiment. The schematic diagram which shows the structural example of PV panel in 1st Embodiment The block diagram which shows the structural example of the subunit | mobile_unit in 1st Embodiment. The schematic diagram which shows the structural example around the housing | casing of the subunit | mobile_unit in 1st Embodiment (A), (B) The schematic diagram which shows the connection example of the connector directly connected to the housing | casing of the subunit | mobile_unit in 1st Embodiment. (A), (B) The schematic diagram which shows the structure of the connector and cable which were provided in the conventional subunit | mobile_unit The schematic diagram which shows the structural example of the solar energy power generation system in 2nd Embodiment. The block diagram which shows the structural example of the subunit | mobile_unit in 2nd Embodiment. The schematic diagram which shows the structural example of the solar energy power generation system in 3rd Embodiment. (A), (B) Schematic diagram showing an example of arrangement of slave units installed around the PV panel (side surface side) in the third embodiment, (C) Installed around the conventional PV panel (side surface side) Schematic diagram showing the arrangement of the handset (A) The schematic diagram which shows the example of arrangement | positioning of the subunit | mobile_unit installed in the circumference | surroundings (back side) of the PV panel in 3rd Embodiment, (B) The subunit | mobile_unit installed in the circumference | surroundings (back side) of the conventional PV panel Schematic diagram showing the arrangement of (A)-(F) The schematic diagram which shows the example of arrangement | positioning of the connector directly connected to the housing | casing of the subunit | mobile_unit in 3rd Embodiment. The schematic diagram which shows the example of arrangement | positioning of the some subunit | mobile_unit accommodated in the 2nd junction box in 3rd Embodiment. The schematic diagram which shows the structural example of the solar energy power generation system in 4th Embodiment. The schematic diagram which shows the structural example of the solar energy power generation system in 5th Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Background to obtaining one embodiment of the present invention)
In the conventional abnormality detection device, the communication environment is not always good in all places where the abnormality detection device is installed. For example, it is conceivable that the communication environment depends on the geographical position where the solar cell string is installed, the shape, the building, the shape of the problem, or the environment around the installation location. Further, for example, it is conceivable that the communication quality is affected depending on the orientation, height, directivity of the antenna in the abnormality detection device, or in which position in the sunlight string the abnormality detection device is installed. Due to the factors exemplified above, for example, interference, reflection, or diffraction of communication radio waves may occur, and the received radio wave intensity may vary.

  Therefore, the quality of wireless communication is deteriorated, so that data measured by the abnormality detection device is not transmitted correctly, and the accuracy of abnormality detection may be reduced.

  Hereinafter, a power generation monitoring device and a power generation monitoring system that can improve the communication accuracy of data communication will be described.

  The power generation monitoring system in the embodiment is applied to, for example, a large-scale solar power generation system (for example, a mega solar). This solar power generation system operates, for example, as a remote monitoring system that collects the performance or degree of deterioration of a solar panel, and a failure detection system that detects an abnormal site from the collected data. In addition, each device in the photovoltaic power generation system may operate based on, for example, an algorithm for specifying an abnormal site or an abnormal cause.

(First embodiment)
FIG. 1 is a schematic diagram illustrating a configuration example of a photovoltaic power generation system 10 according to the first embodiment. The photovoltaic power generation system 10 includes a photovoltaic power generation panel (PV panel) 20, a slave unit 30, a connection box 40, a current collection box 50, a power conditioner (PCS: Power Conditioning System) 60, and a gateway 70.

  The PV panel 20 is a panel including a solar cell that converts light energy into electric power by a photoelectric effect. The PV panel 20 is a solar cell module (PV module) including a plurality of solar cells (PV cells).

  PV panels 20 are connected in series via power line PL to form a solar cell string (PV string) 20ST. PV string 20ST is connected in parallel via power line PL to form a solar cell cluster (PV cluster) 20CL. PV cluster 20CL is connected in parallel via power line PL to form a solar cell array (PV array) 20AR.

  In FIG. 1, the PV string 20ST includes 18 PV panels 20, but the number of the PV panels 20 in the PV string 20ST is not limited to this. The PV cluster 20CL includes eight PV strings 20ST, but the number of PV strings 20ST in the PV cluster 20CL is not limited to this. The PV array 20AR includes, for example, four PV clusters 20CL, but the number of PV clusters 20CL in the PV array 20AR is not limited to this.

  Each PV cluster 20CL is connected to each connection box 40. The connection box 40 includes, for example, a plurality of slave units 30 and a backflow prevention diode (blocking diode) 42. In FIG. 1, one set of handset 30 and a backflow prevention diode 42 are connected to one PV string 20ST via a power line PL. The plurality of connection boxes 40 are connected in parallel and collected in the current collection box 50 via the power line PL.

  For example, one PV cluster 20CL has 18 series × 8 parallel = 144 PV panels 10. Therefore, when one PV array 20AR includes four PV clusters 20CL, the scale includes 144 × 4 = 576 PV panels 10.

  The photovoltaic power generation system 10 can cope with a mega solar in which the output current of the PV array 20AR is a large current (for example, 10A) and the output voltage of the PV array 20AR is a high voltage (for example, 1000V). However, the solar power generation system 10 may not be a mega solar.

  The subunit | mobile_unit 30 acquires electric power generation information (for example, detection, measurement). The power generation information includes, for example, information on voltage, current, and power. In the connection example of FIG. 1, each slave unit 30 acquires, for example, power generation information of each PV string 20ST (detection (measurement) of voltage, current, or power) and transmits the power generation information to, for example, the base unit 80. The power generation information is used, for example, when the parent device 80 determines whether there is an abnormality in the PV panel 10, the PV string 20ST, the PV cluster 20CL, or the PV array 20AR. Note that the power generation information may include, for example, information on calculation results and determination results for directly measured values.

  The subunit | mobile_unit 30 may control MPPT (Maximum Power Point Tracking). The MPPT control of the slave unit 30 is control for maximizing the power generation amount of the PV panel 20 to which the slave unit 30 is connected. This MPPT control can be realized by a known method, for example, a hill climbing method is adopted. The slave unit 30 is managed by the master unit 80. The subunit | mobile_unit 30 is provided with a voltage adjustment circuit (for example, DCDC converter), for example, and controls the electric power of PV string 20ST by switching. The subunit | mobile_unit 30 is supplied with the electric power for operate | moving from the connection box 40 or PV string 20ST, for example.

  The connection box 40 collects and connects the power lines PL as wiring in units of PV strings to the current collection box 50. The connection box 40 includes, for example, a terminal for connecting the power line PL, a switch (not shown) used during inspection or maintenance, a lightning protection element (not shown), and a backflow for preventing a backflow of electricity. A prevention diode 42 is included. The casing of the junction box 40 is formed including, for example, a modified PPE (modified-polyphenylene ether) or a glass fiber composite material.

  In the present embodiment, since the casing of the connection box 40 is not formed of a metallic material, wireless communication by the slave unit 30 is not hindered by the conductor.

  In the solar power generation system 10, the wireless communication status is estimated in advance. As the wireless communication status, for example, the received radio wave intensity (for example, RSSI (Received Signal Strength Indicator)) around the photovoltaic power generation system 10 is measured in advance. This is because, for example, the wireless communication status is considered to be diverse depending on the positional relationship between the location where the slave unit 30 is located and the location where the master unit 80 is located. Base unit 80 may be, for example, a device for collecting data in a control room installed indoors. RSSI is an example of signal strength of a communication signal.

  In the present embodiment, for example, the received radio wave intensity when the slave unit 30 is arranged in the connection box 40 is compared with the received radio wave intensity when the slave unit 30 is arranged at another position in the solar power generation system 10. The slave unit 30 is arranged in the connection box 40 so as to be large. When the reception radio wave intensity when the slave unit 30 is arranged in the connection box 40 is a predetermined value or more, the slave unit 30 may be arranged in the junction box 40. In the connection box 40, it is assumed that the wireless communication state is good as a result of estimating (for example, measuring) the wireless communication state (for example, RSSI). The place where the wireless communication condition is good includes, for example, a place where the surrounding building or other structure does not fall into the shadow.

  The backflow prevention diode 42 prevents a current from flowing back to the PV string 20ST having a low potential when a potential difference occurs between the plurality of PV strings 20ST connected to the connection box 40. The backflow prevention diode 42 includes, for example, two diodes connected in series for high voltage withstand voltage.

  The current collection box 50 collects power from a plurality of sets of input terminals via each power line PL connected to each connection box 40 and outputs power to the power conditioner 60 from one set of output terminals. The configuration of the current collection box 50 is the same as that of the connection box 40. The current collection box 50 is installed in a control room, for example. The current collection box 50 may be omitted.

  The power conditioner 60 converts DC power corresponding to power generated by the plurality of PV panels 20 (for example, the PV array 20AR) into AC power. The power conditioner 60 may perform MPPT control. The MPPT control of the power conditioner 60 is control for maximizing the total sum of the generated power generated by each PV panel 20. This MPPT control can be realized by a known method, for example, a hill climbing method is adopted. For example, a distribution board (not shown) that distributes the electric power from the power conditioner 60 to each electric load (not shown) is connected to the power conditioner 60. The power conditioner 60 is installed for each PV array 20AR, for example.

  For example, the gateway 70 performs predetermined protocol conversion and relays data communication with other networks. For example, the gateway 70 controls access to the power conditioner 60 from a plurality of parent devices 80.

  The parent device 80 can communicate with the child device 30 wirelessly or in a wired manner, and receives predetermined information from the child device 30. The predetermined information includes, for example, power generation information of the PV string 20ST. The power generation information may include, for example, information that the slave unit 30 has detected an abnormality, current information in the PV string 20ST, voltage information, or power information. The parent device 80 manages the child device 30. In FIG. 1, one master unit 80 is arranged for one PV cluster 20CL. The base unit 80 is disposed in the current collection box 50, for example.

  The subunit | mobile_unit 30 and the main | base station 80 are examples of a communication apparatus. The subunit | mobile_unit 30 is an example of a power generation monitoring apparatus. The arrangement position of the subunit | mobile_unit 30 is not restricted to the arrangement position illustrated in FIG.

Next, a configuration example of the PV panel 20 will be described.
FIG. 2 is a schematic diagram illustrating a configuration example of the PV panel 20.

  The PV panel 20 includes a plurality of solar cell groups (PV cell groups) 20G. Each PV cell group 20G includes a plurality of PV cells 20C. The plurality of PV cells 20C included in the PV cell group 20G are connected in series. In addition, bypass diodes BD (BD1 to BD3) are connected in parallel to each of PV cell groups 20G (20G1 to 20G3). In FIG. 2, three PV cell groups 20G and three bypass diodes BD are provided, but the number is not limited to this.

  When no malfunction occurs in the PV cell 20C, each PV cell group 20G generates power and generates a voltage. Thereby, since a reverse voltage is applied to the bypass diode BD, the bypass diode BD does not pass current.

  On the other hand, it is assumed that a malfunction (for example, failure or shadow) occurs in the PV cell 20C included in the PV cell group 20G1. In this case, the defective PV cell 20 </ b> C does not generate power and becomes a simple resistor, so that the energy generated by the other PV cell groups 20 </ b> G <b> 2 and 20 </ b> G <b> 3 is consumed and the generated power of the PV panel 20 is reduced.

  Further, when the supply of current to the defective PV cell 20C is continued, the PV cell 20C may be thermally damaged, for example. The bypass diode BD1 connected in parallel to the PV cell group 20G1 bypasses and passes the current flowing through the PV cell group 20G including the PV cell 20C in which a failure has occurred.

Next, a configuration example of the slave unit 30 will be described.
FIG. 3 is a block diagram illustrating a configuration example of the slave unit 30.

  The subunit | mobile_unit 30 is provided with the power supply part 32, the voltage detection part 33, the electric current detection part 34, the control part 36, the radio | wireless communication part 37, the input terminal 38, and the output terminal 39. In FIG. 1, one slave unit 30 is provided for each PV string 20ST. The subunit | mobile_unit 30 measures the electric current and voltage of PV string 20ST, for example between the terminals of the backflow prevention diode 42 provided in the connection box 40 as a measurement location.

  For example, the power supply unit 32 receives power from the PV panel 20, the PV string 20 </ b> ST, or the connection box 40 to which the slave unit 30 is connected or arranged, and supplies power to each unit in the slave unit 30.

  The voltage detector 33 detects the output voltage of the PV string 20ST connected to the child device 30. The current detection unit 34 detects the output current of the PV string 20ST connected to the child device 30. The voltage detection unit 33 and the current detection unit 34 are examples of an acquisition unit. The voltage detection unit 33 and the current detection unit 34 directly detect the current flowing through the shunt resistor and the voltage applied to the shunt resistor as IV characteristics using, for example, a shunt resistor.

  The control unit 36 includes, for example, a CPU (Central Processing Unit) and a ROM (Read Only Memory). Various processes of the control unit 36 are performed by the CPU executing programs stored in the ROM.

  The control unit 36 may calculate the output power of the PV string 20ST as a product of the output voltage of the PV string 20ST and the output current of the PV string 20ST. The output power of the PV panel 20 may be detected by a power detection unit (not shown).

  For example, the wireless communication unit 37 receives detection information including the current value detected by the current detection unit 34 or the voltage value detected by the voltage detection unit 33, or information on abnormality in the PV string 20ST based on the detected information. , To the base unit 80. For example, the wireless communication unit 37 may wirelessly communicate with other slave units 30, the power conditioner 60, and the gateway 70.

  The wireless communication includes, for example, communication using DECT (Digital Enhanced Cordless Communication), communication using a wireless LAN (Local Area Network), or communication using Zigbee (registered trademark).

  The input terminal 38 receives, for example, a voltage or current from the PV string 20ST. The output terminal 39 outputs, for example, a voltage or current from the PV string 20ST.

Next, a structural example of the slave unit 30 will be described.
FIG. 4 is a schematic diagram showing an example of the structure around the housing 31 of the slave unit 30. The housing 31 is provided with connectors for the input terminal 38 and the output terminal 39. The housing 31 stores, for example, a board on which electronic components (not shown) are mounted.

  The housing | casing 31 of the subunit | mobile_unit 30 is formed including PC (polycarbonate) resin, ABS resin, or PPE, for example. The casing 31 can be kept waterproof and dustproof, for example, by being sealed with a waterproof packing (for example, rubber packing). A connector 45 (45 a, 45 b) into which a cable having rigidity is inserted is provided on the side surface of the housing 31 corresponding to the input terminal 38 and the output terminal 39. The connector 45 has rigidity. Note that a rigid cable may not be inserted into the connector 45, but may be directly connected to a connector of another device or housing. For example, each component of the slave unit 30 is accommodated in the casing 31. The connector 45 includes, for example, PPE or a composite material of PPE and glass fiber.

  One end of a pair of panel connectors 45a is directly connected to one side surface (surface on the X-axis negative side in FIG. 4) of the casing 31. The panel connector 45 a is a connector to which the other end of the connector 45 a is connected to the PV panel 20. The panel connector 45a is an example of a first connector.

  One end of a pair of line connectors 45b is directly connected to other side surfaces of the casing 31 (upper side surface and lower side surface in FIG. 4, surfaces on the Y axis positive side and negative side). The line connector 45 b is a connector that connects the slave units 30 or is connected to both ends of the backflow prevention diode 42. When connecting the subunit | mobile_unit 30, it connects with the other end of the connector 45b for lines of the other subunit | mobile_unit 30, for example. The line connector 45b is an example of a second connector.

  Here, the panel connector 45a and the line connector 45b are collectively referred to as the connector 45 unless particularly distinguished.

  In FIG. 4, in the connector 45 connected to the positive terminal and the negative terminal, the shape of the engaging portion that engages with the connector of another device or the housing is different, but may be the same. Moreover, the arrangement position of each connector 45 with respect to the housing | casing 31 may be arrangement positions other than FIG. The connector 45 satisfies, for example, the IEC standard 1000V withstand voltage and IP67.

  FIGS. 5A and 5B are schematic diagrams illustrating a connection example of the connector 45 directly connected to the housing 31 of the slave unit 30. FIG. 5A shows an example of a state before the connector 45 is assembled to the housing 31. FIG. 5B shows an example of a state after the connector 45 is assembled to the housing 31.

  5A and 5B, the connector 45 is directly inserted into the connector connection portion 31a on the side surface of the housing 31. FIG. The connector 45 is fixed to the housing 31 by sandwiching the housing side wall 31b with a washer 47 connected to the cable 48 on the inner side. The cable 48 on the inner side has rigidity, for example. A connector 45 that is engaged with an external connector or a cable having rigidity is disposed on the outside of the housing side wall 31b. An external connector or a rigid cable is connected to the connector 45.

  By providing the connector 45 shown in FIGS. 4, 5 </ b> A, and 5 </ b> B, it is possible to suppress deterioration of the waterproof function at the interface of different materials around the connector as compared with the conventional slave unit.

  6 (A) and 6 (B) are schematic views showing structural examples of connectors and cables provided in a conventional slave unit. In FIG. 6A, the panel connector and the line connector are connected to each other on the same side surface of the housing 31 via a flexible cable. FIG. 6B shows that a panel connector 45a is connected via a flexible cable on one side surface of the housing 31, and a line connector 45b is formed on the opposite surface facing the one side surface of the housing 31. Are connected via a flexible cable.

  In the conventional structure around the connector, there are many places that are easily damaged by an external force. In FIGS. 6A and 6B, a portion where water easily enters is indicated by an arrow α, and a portion that is easily damaged by an external force is indicated by an arrow β.

  6A and 6B, it can be understood that the waterproof function and the dustproof function of the connector 45 can be maintained because, for example, the number of dissimilar material interfaces where there are locations α where water easily enters is reduced. The waterproof function and the dustproof function are at a level satisfying IP67 or IP68, which is a protection characteristic in the IEC (International Electrotechnical Commission) standard, for example.

  When the flexible cable connected to the slave unit is to be connected to the connection terminal of another slave unit or the case as in the conventional case shown in FIGS. A load is applied to the cable due to the weight (self-weight) of the housing, and for example, the cable may be deteriorated or disconnected. In addition, if a force is applied when attaching a flexible cable, that is, if an external force is applied, for example, the cable may be deteriorated or disconnected. If the cable is flexible, the cable is likely to be tangled, Pulling in a tangled state may cause the cable to deteriorate or break.

  On the other hand, as shown in FIGS. 4 and 5A, 5B, by using the connector 45 having rigidity, for example, the connectors 45 or connectors 45 with respect to the housing 31 of the other slave unit 30 are used. And a rigid cable can be directly connected. Therefore, unlike connection using a cable having flexibility, it is possible to prevent deterioration or disconnection of the cable.

  Moreover, even when attaching the subunit | mobile_unit 30 to the PV panel 20, or when conveying the subunit | mobile_unit 30, since a cable is not inserted in the housing | casing 31 from the exterior side, for example, the weight is applied to the rubber packing, It is possible to prevent the pressure contact surface between the cable and the rubber packing from moving. Therefore, it can suppress impairing the waterproofness and dustproofness of the subunit | mobile_unit 30. FIG.

  Therefore, the quality (for example, communication quality, various measurement quality, abnormality detection quality) of the subunit | mobile_unit 30 can be guaranteed over a long period (for example, 20 years).

  As described above, in the solar power generation system 10, the plurality of slave units 30 connected to each PV string 20ST are intensively arranged in the connection box 40 where the wireless communication state is favorable. According to the solar power generation system 10, it is possible to suppress deterioration in the quality of wireless communication and improve the accuracy of abnormality detection in the PV panel 20, the PV string 20ST, the PV cluster 20CL, or the PV array 20AR.

  Moreover, according to the solar power generation system 10, since the deterioration of the quality of wireless communication is suppressed, the performance of the PV string 20ST or the collection accuracy of the deterioration degree can be improved. Moreover, long-term reliability of the solar power generation system 10 can be ensured, and maintenance and maintenance work of the solar power generation system 10 can be facilitated.

  Further, when an external cable is connected to the connector 45 directly connected to the housing 31 of the slave unit 30, an external force is applied to the waterproof packing in the housing 31 during transportation or handling, for example, waterproof or dustproof. It can suppress that it falls.

(Second Embodiment)
In 1st Embodiment, the subunit | mobile_unit was arrange | positioned in the junction box and illustrated acquiring the power generation information of PV string. The second embodiment exemplifies that the slave unit is arranged in the connection box and acquires the power generation information of one PV panel in the PV string.

  FIG. 7 is a schematic diagram illustrating a configuration example of a solar power generation system 10A according to the second embodiment. In the photovoltaic power generation system 10A, the same components as those in the photovoltaic power generation system 10 illustrated in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  The solar power generation system 10 </ b> A includes a PV panel 20, a slave unit 30 </ b> A, a connection box 40, a current collection box 50, a power conditioner 60, and a gateway 70.

  The subunit | mobile_unit 30A acquires electric power generation information. In the connection example of FIG. 7, each slave unit 30A acquires power generation information of any PV panel 20 in each PV string 20ST (for example, detects (measures) voltage, current, or power), and generates power generation information, for example, as a parent. To the machine 80. The power generation information is used, for example, when the parent device 80 determines whether there is an abnormality in the PV panel 10, the PV string 20ST, the PV cluster 20CL, or the PV array 20AR.

  The subunit | mobile_unit 30A may perform MPPT (Maximum Power Point Tracking) control. The slave unit 30A is managed by the master unit 80. The subunit | mobile_unit 30A is provided with a voltage adjustment circuit (for example, DCDC converter), for example, and controls the electric power of the PV panel 20 connected to subunit | mobile_unit 30A by switching. The subunit | mobile_unit 30A is supplied with the electric power for operate | moving from the PV panel 20 to which the junction box 40 or subunit | mobile_unit 30A was connected, for example.

  The master unit 80 can communicate with the slave unit 30A wirelessly or by wire, and receives predetermined information (for example, power generation information) from the slave unit 30A. The power generation information may include, for example, information that the slave unit 30A has detected an abnormality, current information in the PV panel 20, voltage information, or power information. The master unit 80 manages the slave unit 30A.

Next, a configuration example of the slave unit 30A will be described.
FIG. 8 is a block diagram showing a configuration example of the slave unit 30A. Here, the difference between slave unit 30A and slave unit 30 will be mainly described.

  The slave unit 30A includes a power supply unit 32, a voltage detection unit 33A, a current detection unit 34A, a control unit 36, a wireless communication unit 37, an input terminal 38, and an output terminal 39. In FIG. 7, the slave unit 30A is connected to an arbitrary PV panel 20 in the PV string 20ST. The subunit | mobile_unit 30A measures the electric current and voltage of PV panel 20, for example, between the terminals of PV panel 20 as a measurement location.

  The arbitrary PV panel 20 to which the child device 30A is connected is determined according to, for example, the installation position of the child device 30A, the shaded state, and the wireless communication state. For example, the position where the shade is generated and whether or not the wireless communication status is good may be measured in advance to be used as a judgment material for the arbitrary PV panel 20. For example, the RSSI may be determined based on the RSSI.

  In FIG. 7, for example, in the PV panel 10 located closest to the connection box 40 in each PV string, the wireless communication status is good, and the slave unit 30A is connected to the PV panel arranged at this position. Illustrate. The wiring of the subunit | mobile_unit 30 can be shortened by making the PV panel 10 located in the side nearest to the connection box 40 in each PV string into the acquisition object of power generation information. The power generation information acquisition target is, for example, a measurement target that measures voltage, current, or power.

  The voltage detection unit 33A detects the output voltage of the PV panel 20 connected to the child device 30A. The current detection unit 34A detects the output current of the PV panel 20 connected to the slave unit 30A.

  The control unit 36 may calculate the output power of the PV panel 20 as a product of the output voltage of the PV panel 20 and the output current of the PV panel 20. The output power of the PV panel 20 may be detected by a power detection unit (not shown).

  The wireless communication unit 37 detects, for example, detection information including the current value detected by the current detection unit 34 or the voltage value detected by the voltage detection unit 33, or information on abnormality in the PV panel 20 based on the detected information. , To the base unit 80.

  The input terminal 38A inputs a voltage or current from the PV panel 20, for example. The output terminal 39A outputs the voltage or current from the PV panel 20, for example.

  The structural example of the handset 30A is the same as the structural example of the handset 30 in the first embodiment.

  As described above, in the solar power generation system 10A, the plurality of slave units 30A connected to any PV panel 20 in the PV string 20ST are intensively arranged in the connection box 40 where the wireless communication state is good. . According to the solar power generation system 10A, it is possible to prevent deterioration in the quality of wireless communication and improve the accuracy of abnormality detection in the PV panel 20, the PV string 20ST, the PV cluster 20CL, or the PV array 20AR.

  Moreover, according to the solar power generation system 10A, the collection accuracy of the performance or deterioration degree of the PV panel 20 can be improved. Moreover, long-term reliability of the solar power generation system 10A can be ensured, and maintenance and maintenance work of the solar power generation system 10A can be facilitated.

  In addition, since the slave unit 30A acquires the power generation information of one PV panel 20 in each PV string 20ST, the investment cost can be reduced as compared with the case where the information of all the PV panels 20 is acquired in each PV string 20ST.

(Third embodiment)

  In 1st Embodiment and 2nd Embodiment, having illustrated the subunit | mobile_unit arrange | positioning at a connection box was illustrated. In 3rd Embodiment, it assumes that a subunit | mobile_unit is arrange | positioned in positions other than the connection box in which the backflow prevention diode was incorporated. In the third embodiment, as in the second embodiment, the power generation information of one PV panel in the PV string is exemplified.

  FIG. 9 is a schematic diagram illustrating a configuration example of the solar power generation system 10B according to the third embodiment. In the photovoltaic power generation system 10B, the same components as those of the photovoltaic power generation system 10 or 10A are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  The solar power generation system 10 </ b> B includes a PV panel 20, a slave unit 30 </ b> B, a connection box 40, a current collection box 50, a second connection box 55, a power conditioner 60, and a gateway 70.

  A configuration example of the slave unit 30B is the same as the configuration example of the slave unit 30A. The subunit | mobile_unit 30B acquires the electric power generation information of the arbitrary PV panels 20 in PV string 20ST. Since the conditions of the arbitrary PV panel 20 to which the slave unit 30B is connected in each PV string 20ST are the same as the contents described in the second embodiment, the description thereof is omitted.

  In FIG. 9, for example, the PV panel 20 located closest to the connection box 40 in each PV string has good wireless communication status, and the slave unit 30B is connected to the PV panel 20 arranged at this position. Is illustrated.

  For example, a wireless communication situation (for example, RSSI) is estimated (for example, measured) in advance around a place where the solar power generation system 10B is installed using a measurement device (not shown). The subunit | mobile_unit 30B is installed in the place where a radio | wireless communication condition is favorable as a result of a measurement.

  In FIG. 9, it is assumed that the wireless communication status is good in the second connection box 55. That is, it is exemplified that the slave units 30B are intensively arranged in the second connection box 55. In this case, the power to the slave unit 30B is supplied from the PV panel 20 to which the second connection box 55 or the slave unit 30B is connected. The subunit | mobile_unit 30B may be supplied with the electric power for operate | moving from the PV panel 20 with the minimum IV fluctuation | variation by MPPT operation | movement.

  The second junction box 55 is formed including, for example, PC resin, ABS resin, PPE, or a composite material of PPE and glass fiber. The second connection box 55 has, for example, a waterproof and dustproof function of IP65 or higher, which is a protective characteristic in the IEC (International Electrotechnical Commission) standard. The second connection box 55 is an example of a storage box.

  The second connection box 55 and the slave unit 30B are arranged at the end (lower end in FIG. 9) of the PV array 20AR. Thereby, the influence resulting from the PV panel 10 with respect to communication by the subunit | mobile_unit 30B can be suppressed, and the communication precision of the subunit | mobile_unit 30B can be improved.

  There may be a plurality of second connection boxes 55. In this case, a plurality of slave units 30B may be disposed in the connection box 55 for each PV cluster 20CL.

  When the child device 30B is accommodated in the second connection box 55, each component in the child device 30B is protected by the double structure of the housing 31 of the child device 30B and the housing of the second connection box 55. . Moreover, you may simplify the housing | casing 31 of the subunit | mobile_unit 30B by setting it as a double structure. For example, the housing 31 of the slave unit 30B may include PC having slightly inferior characteristics (weather resistance, water absorption, electrical insulation), and a composite material of PC and ABS. The casing 31 satisfies, for example, LP94 V0 or higher in order to maintain flame retardancy. Even in this case, the desired waterproof function and dustproof function can be satisfied, and the slave unit 30B can be made inexpensive.

  Unlike the configuration example of FIG. 9, the slave unit 30B may not be accommodated in the second connection box 55 and may be installed in a place where the slave unit 30B alone has a good wireless communication status. In this case, in the solar power generation system 10B, the second junction box 55 may be omitted. In the solar power generation system 10 </ b> B, the slave unit 30 </ b> B accommodated in the connection box 55 and the slave unit 30 </ b> B installed alone may be mixed.

  Next, the example of arrangement | positioning of the subunit | mobile_unit 30B with respect to the PV panel 20 is demonstrated.

  FIGS. 10A and 10B are schematic diagrams illustrating an arrangement example of the slave units 30B installed around the PV panel 20 (side surfaces). 10A and 10B, for example, three PV strings 20ST are included.

  As shown in FIG. 10 (A), for example, at least some of the slave units 30B among the plurality of slave units 30B may be bundled and installed by the mounting bracket 53. The place where the handset 30B is collectively installed is a place where the wireless communication status is good. The slave unit 30 </ b> B may be accommodated in the second connection box 55 in a state where the slave units 30 </ b> B are gathered together using the mounting bracket 35.

  By gathering together with the mounting bracket 53, the number of parts for installing each cordless handset 30B can be reduced. Further, for example, a binding band for bundling flexible cables can be omitted.

  As shown in FIG. 10 (B), for example, the side panel (Y-axis positive side end part) of the PV panel 20 or the corner part (X-axis positive side end part and Y-axis positive side end part) of the side surface part is collected. The handset 30B may be installed. You may accommodate in the 2nd connection box 55 in the state which the subunit | mobile_unit 30B was put together. By gathering together with the mounting bracket 53, the number of parts for installing each cordless handset 30B can be reduced. The place where the handset 30B is collectively installed is a place where the wireless communication status is good. Compared with the back side of the PV panel 20, the side surface portion or the corner portion has a better wireless communication situation.

  FIG. 10C is a schematic diagram showing the arrangement of the slave unit 30x installed on the side surface of the conventional PV panel 20x. In FIG. 4C, the slave unit 30x is installed at the same position (the lower end in FIG. 10C) with respect to each PV panel 20x. In this case, the slave unit 30x may be arranged in a place where the wireless communication status is not always good.

  FIG. 11A is a schematic diagram showing an arrangement example of the slave units 30B installed around the PV panel 20 (back surface). In FIG. 11 (A), the subunit | mobile_unit 30B is concentrated and installed in a place with a favorable wireless communication condition. In FIG. 11 (A), reference numerals a to e are places where the wireless communication status is good.

  Whether the wireless communication status is good or not is determined, for example, by a measurement device (not shown) before the slave unit 30B is installed. For example, when the reception sensitivity is equal to or higher than a predetermined value, the measurement device determines that the wireless communication state is good.

  FIG. 11 (B) is a schematic diagram showing an arrangement of slave units 30x installed on the back surface of a conventional PV panel 20x. In FIG. 11B, for example, the slave unit 30x is evenly installed at the upper end (Y-axis positive side end) of the PV panel 20x, and the slave unit 30x is arranged in a place where the wireless communication status is not always good. There was also.

  As shown in FIGS. 10A, 10B, and 11A, the slave units 30B are collectively arranged on the side surface of the PV panel 20 (PV string 20ST, PV cluster 20CL, PV array 20AR), Or you may aggregate and arrange | position to a side surface. Thereby, the arrangement position of the subunit | mobile_unit 30B can be determined flexibly according to the shape of the roof in which the PV panel 20 is installed, the position of a shadow, and the wireless communication condition, for example. That is, the degree of freedom of arrangement of the PV panel 20 can be improved according to the restrictions on the arrangement of the PV panel 20. Therefore, the subunit | mobile_unit 30B can be installed collectively, for example also with respect to the roof which has a complicated shape.

Next, the arrangement position of the connector 45 with respect to the housing | casing 31 of the subunit | mobile_unit 30B is demonstrated.
FIGS. 12A to 12F are schematic diagrams illustrating an arrangement example of the connector 45 directly connected to the housing 31. In FIGS. 12A to 12F, the connector 45 disposed in the housing 31 is also shown for easy understanding.

  In FIG. 12A, the positive terminal and the negative terminal (positive / negative pair) of the panel connector 45a are arranged on the same side surface (same surface). The positive and negative pairs of the line connector 45b are arranged on the side surfaces (opposing surfaces) facing each other. The panel connector 45a and the line connector 45b are arranged on side surfaces (adjacent surfaces) adjacent to each other. The arrangement example in FIG. 12A is the same as the arrangement example shown in FIG.

  In FIG. 12B, the positive and negative pairs of panel connectors 45a are arranged on adjacent surfaces. The positive and negative pairs of line connectors 45b are arranged on adjacent surfaces. The panel connector 45a and the line connector 45b are arranged on opposing surfaces.

  In FIG. 12C, the positive and negative pairs of panel connectors 45a are arranged on the same plane. The positive and negative pairs of line connectors 45b are arranged on adjacent surfaces. The panel connector 45a and the line connector 45b are arranged on an adjacent surface or an opposing surface.

  In FIG. 12D, the positive and negative pairs of panel connectors 45a are arranged on the same plane. The positive and negative pairs of line connectors 45b are arranged on the same plane. The panel connector 45a and the line connector 45b are disposed on adjacent surfaces.

  In FIG. 12E, the positive and negative pairs of panel connectors 45a are arranged on the same plane. The positive and negative pairs of line connectors 45b are arranged on the same plane. The panel connector 45a and the line connector 45b are disposed on adjacent surfaces. In FIG. 12E, the line connector 45b extends in the Z-axis direction and is disposed at the Y-axis negative side end.

  In FIG. 12F, the positive and negative pairs of panel connectors 45a are arranged on the same plane. The positive and negative pairs of line connectors 45b are arranged on the same plane. The panel connector 45a and the line connector 45b are disposed on adjacent surfaces. In FIG. 12F, the line connector 45b extends in the Z-axis direction and is disposed at the X-axis positive side end.

  12A to 12F, the panel connector 45a and the line connector 45b may be reversed.

  As shown in FIGS. 4 and 12A to 12F, the positive and negative pairs of the panel connector 45a or the line connector 45b may have different shapes. Since the shapes of the positive and negative pair connectors are different, it is easy for the user of the slave unit 30B to recognize whether it is a positive terminal or a negative terminal, and erroneous connection can be suppressed.

  Thus, since various positions are conceivable as the connection position of the connector 45 to the housing 31 of the slave unit 30B, the connection can be made at a distance close to the shortest distance no matter which direction the other slave unit 30B is located. Therefore, for example, the degree of freedom of arrangement of the plurality of slave units 30B can be improved. For example, the arrangement position of the child device 30B can be determined flexibly according to the shape of the roof on which the PV panel 20 is installed, the position of the shade, and the communication state.

  Therefore, the subunit | mobile_unit 30B can be installed collectively, for example also with respect to the roof which has a complicated shape. Moreover, the subunit | mobile_unit 30B can be installed in the empty space in a roof with the PV panel 20 already installed. Moreover, even if the arrangement | positioning place of the subunit | mobile_unit 30B which makes a communication state favorable is restricted according to the structure of the installation location of the PV panel 20, the surrounding building, and a radio wave condition, the subunit | mobile_unit 30B can be installed flexibly.

  Further, since the connector 45 connected to the housing 31 is not symmetrical with respect to the housing 31 with respect to the housing 31 of the slave unit 30B, The possibility of erroneous connection with the line connector 45b can be suppressed, and human errors can be suppressed. The structure having no symmetry with respect to the casing 31 is, for example, a structure that is asymmetric with respect to the top, bottom, left and right of the casing 31.

  As described above, in the slave unit 30 </ b> B, the panel connector 45 a and the line connector 45 b are arranged on the same surface or adjacent surfaces of the side surfaces of the housing 31. Moreover, in the subunit | mobile_unit 30B, the positive / negative pair of the connector 45a for panels or the positive / negative pair of the connector 45b for lines is arrange | positioned among the side surfaces of the housing | casing 31 on the same surface, adjoining, or an opposing surface. Thereby, according to the various installation environments where the subunit | mobile_unit 30B is installed, the some subunit | mobile_unit 30B can be installed compactly and installation enforcement can be made easy.

  Next, an arrangement example of the plurality of slave units 30B accommodated in the second connection box 55 will be described.

  FIG. 13 is a schematic diagram illustrating an arrangement example of the plurality of slave units 30 </ b> B accommodated in the second connection box 55. In FIG. 13, a plurality of slave units 30 are connected by connectors 45 without a cable in the X-axis direction, for example. Therefore, the volume occupied by the plurality of slave units 30B can be made more compact.

  In the second connection box 55, a common antenna 46 is installed as an antenna connected to the communication antennas of the plurality of slave units 30B or as an antenna replacing the communication antennas of the plurality of slave units 30B. By using the same antenna for the plurality of slave units 30B, variation in signal strength of communication signals can be suppressed. Moreover, the some subunit | mobile_unit 30B may transmit using the same common antenna 46, and the main | base station 80 may receive the information from the subunit | mobile_unit 30B. In this case, it can be easily estimated whether the PV panel 20 or the PV string 20ST is defective or the wireless communication status is defective.

  For example, in the case of a malfunction of the PV panel 20 or the PV string 20ST, the master unit 80 cannot normally receive information (for example, measurement value information) from the defective PV panel 20 or the PV string 20ST. Therefore, when the communication between the specific slave unit 30 and B is poor, the master unit 80 can determine that there is a malfunction in the specific PV panel 20 or PV string 20ST.

  Further, for example, when the wireless communication environment in the second connection box 55 is bad, the master unit 80 cannot normally receive information (for example, measurement value information) from all the PV panels 20 or PV strings 20ST. . Accordingly, the base unit 80 can determine that the communication environment is bad when communication with all the handset units 30B is bad.

  Moreover, since RSSI of the subunit | mobile_unit 30B installed in the 2nd connection box 55 shows a substantially identical value, you may determine the presence or absence of abnormality using the value of RSSI. For example, when there are slave units 30 having different RSSI values, for example, it can be determined that there is an abnormality in the common antenna 46 or the slave unit 30B having different RSSI values.

  In the signal cable 49 that connects each slave unit 30B, for example, power generation information transmitted to the master unit 80 (for example, information on measurement results by each slave unit 30B, information on the presence or absence of abnormality detection) is transmitted. The common antenna 46 transmits information transmitted via the signal cable 49 to, for example, the parent device 80. Information received by the common antenna 46 (for example, control information from the parent device 80) is sent to each child device 30B via the signal cable 49. A current flows through each connector 45 connected to each slave unit 30B.

  The second connection box 55 includes a cable in addition to the connector 45, and this cable has rigidity, for example. The connector provided in the second connection box 55 is connected to the housing of the second connection box 55 in the same manner as the connector 45 provided in the slave unit 30 shown in FIGS. 5 (A) and 5 (B), for example. And fixed. Therefore, in the second connection box 55, the cable is not entangled and a waterproof function and a dustproof function can be secured.

  The housing 31 and the second connection box 55 of the slave unit 30B may be provided with, for example, a vent filter, a drain plug, or a drain outlet. The vent filter has a function of maintaining a constant air pressure through the air. The casing 31 and the second junction box 55 may be filled with a potting resin. Thereby, generation | occurrence | production of dew condensation can be suppressed.

  In the solar power generation system 10 </ b> B, the slave unit 30 </ b> B is installed in a place other than the connection box 40 in which the backflow prevention diode 42 is built. The backflow prevention diode 42 has many opportunities for current to flow in the forward direction, and easily generates heat due to the resistance component of the backflow prevention diode 42. In addition, since a large power of, for example, 1000 V is collected in the connection box 40, noise is easily superimposed on the electric signal in the connection box 40.

  By accommodating the subunit | mobile_unit 30B in the 2nd connection box 55 or installing the subunit | mobile_unit 30B independently, it is spaced apart from the backflow prevention diode 42 and the influence by the heat_generation | fever of the backflow prevention diode 42 can be suppressed. Further, the influence of noise on wireless communication is further reduced, and communication deterioration of data communication can be suppressed.

  Further, for example, it is not necessary to correct the temperature of the power generation information (for example, measurement result) of the PV panel 20 by the slave unit 30B, and the measurement accuracy by the voltage detection unit 33A or the current detection unit 34A of the slave unit 30B can be improved. Therefore, malfunction due to the heat of the electronic component in the slave unit 30B, temperature characteristics of the current value, voltage value, or power value acquired (for example, measured) by the slave unit 30B can be improved, and the accuracy of abnormality detection can be improved.

  Moreover, when connecting the subunit | mobile_unit 30B in the 2nd junction box 55, the volume which several subunit | mobile_unit 30B occupies spatially can be decreased. Further, since the distance from the backflow prevention diode 42 is increased, the heat resistance of the components accommodated in the slave unit 30B can be reduced.

  Moreover, the dustproof and waterproof function can be achieved by providing the dustproof / waterproof casing 31 with the electronic component of the slave unit 30B and the slave unit 30B being accommodated in the second junction box 55. It can be further improved. Therefore, the reliability of the subunit | mobile_unit 30B installed, for example in the outdoors severe environment can be improved.

  Moreover, the subunit | mobile_unit 30B and the 2nd connection box 55 can guarantee waterproofness (for example, IP65 or more in IEC specification), a weather resistance, and reliability for a long period (for example, 10 years-20 years). The weather resistance indicates, for example, the degree of deterioration resistance due to a combination of ultraviolet rays, temperature, and humidity.

(Fourth embodiment)
The fourth embodiment is a modification of the third embodiment. In the fourth embodiment, it is assumed that there is a shadow at an arbitrary place in the PV array. For example, it is assumed that there is a PV panel whose light receiving surface is shaded in the PV array due to surrounding buildings or other structures.

  FIG. 14 is a schematic diagram illustrating a configuration example of a solar power generation system 10C according to the fourth embodiment. In the solar power generation system 10C, the same components as those of the solar power generation systems 10, 10A, and 10B are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  The solar power generation system 10 </ b> C includes a PV panel 20, a slave unit 30 </ b> C, a connection box 40, a current collection box 50, a second connection box 55, a power conditioner 60, and a gateway 70.

  The configuration example of the slave unit 30C is the same as the configuration example of the slave units 30A and 30B. The subunit | mobile_unit 30C acquires the electric power generation information of the arbitrary PV panels 20 in PV string 20ST. Since the conditions of the arbitrary PV panel 20 to which the child device 30C is connected in each PV string 20ST are the same as the contents described in the second embodiment, the description thereof is omitted.

  In FIG. 14, similarly to the third embodiment, the slave unit 30 </ b> C is arranged at a position where the wireless communication status is good, for example, the slave unit 30 </ b> C alone or included in the second connection box 55. Although FIG. 14 illustrates the case where there is one second connection box 55, a plurality of second connection boxes 55 may be provided.

  On the other hand, in the PV panel 20, for example, the PV panel 20 existing at the position where the shadow 112 of the utility pole extends is not the acquisition target of the power generation information, and the PV panel 20 that does not become the shade is the acquisition target of the power generation information. That is, for example, the slave unit 30C is connected to the PV panel 20 in which the amount of light received by the PV panel 20 is equal to or greater than a predetermined amount (for example, does not become a shade). Similar to the second embodiment, the plurality of slave units 30C are concentrated in one place and accommodated in the second connection box 55 having a good communication environment. This is because, when the PV panel 20 enters the shade, for example, the IV characteristic or the PV characteristic of the PV panel 20 to be measured is affected. Further, this is because the PV characteristics are affected, and the power supplied to the slave unit becomes insufficient, resulting in deterioration of communication quality (cannot be communicated).

  In the present embodiment, it is possible to determine in which time zone and at which position the shade is present by performing a simulation in advance. For example, the child device 30C may be always connected to the PV panel 20 arranged at a position that does not become shade in any time zone, and the child device 30C may acquire (for example, measure) the power generation information of the PV panel 20. In addition, for example, when the position of the shade moves depending on the time zone, the PV panel 20 arranged at a location that does not become the shade among the plurality of PV panels 20 is selected as the acquisition target of the power generation information according to the time zone. Therefore, the control unit 36 of the slave unit 30C may perform switching.

  According to the solar power generation system 10C, for example, the power generation information of the PV panel 10 in each PV string 20ST can be acquired without being affected by the shade, and for example, the measurement accuracy regarding power generation can be improved. Furthermore, by arranging the slave unit 30C in a place where the wireless communication status is good, the communication system of data communication by the slave unit 30C is improved, and for example, the accuracy of abnormality detection by the master unit 80 can be improved.

(Fifth embodiment)
In the fifth embodiment, it is assumed that the child device is supplied with power for operating the child device from any PV panel or PV string. Further, it is assumed that the power generation amount of the PV panel from which the slave unit acquires power generation information is equal to or less than a predetermined amount, and the power for operating the slave unit cannot be obtained from the PV panel from which the power generation information is acquired.

  FIG. 15 is a schematic diagram illustrating a configuration example of a solar power generation system 10D according to the fifth embodiment. In the solar power generation system 10D, the same components as those of the solar power generation systems 10, 10A, 10B, and 10C are denoted by the same reference numerals, and description thereof is omitted or simplified.

  The photovoltaic power generation system 10 </ b> D includes a PV panel 20, a slave unit 30 </ b> D, a connection box 40, a current collection box 50, a second connection box 55, a power conditioner 60, and a gateway 70.

  In FIG. 15, slave units 30D1 and D2 are illustrated as the slave units 30D. The subunit | mobile_unit 30D1 is provided with the power supply part 32D1, the voltage detection part 33A, the current detection part 34A, the control part 36D1, the radio | wireless communication part 37D1, the input terminal 38, and the output terminal 39. The slave unit 30D2 includes a power supply unit 32D2, a voltage detection unit 33A, a current detection unit 34A, a control unit 36D2, a wireless communication unit 37D2, an input terminal 38, and an output terminal 39. In the slave unit 30D, the description of the same configuration as that of the slave units 30 and 30A is omitted or simplified.

  Here, a configuration example of the slave unit 30D1 is mainly exemplified.

  The power supply unit 32D1 receives power supply from the PV panel 20 to which the slave unit 30D1 is connected, and supplies power to each unit in the slave unit 30D1.

  The power supply unit 32D1 may supply power to the other slave unit 30D (for example, the slave unit 30D2) via the power line PL in a predetermined case. The predetermined case includes, for example, a case where power for operating the other child device 30D is insufficient (the power of the other child device 30D is equal to or lower than the predetermined power). In the above predetermined case, for example, the power for operating the other slave unit 30D is insufficient, and even if the slave unit 30D1 supplies power to the other slave unit 30D, the slave unit 30D1 This includes a case where power for operation is sufficient (the power of the slave unit 30D1 is equal to or higher than a predetermined power).

  The power supply unit 32D1 may be supplied with power from the other slave unit 30D (for example, the slave unit 30D2) via the power line PL in a predetermined case. The predetermined case includes, for example, a case where power for operating the slave unit 30D1 is insufficient (the power of the slave unit 30D1 is equal to or less than the predetermined power). Further, in the above predetermined case, for example, the power for operating the slave unit 30D1 is insufficient, and even if another slave unit 30D supplies power to the slave unit 30D1, the other slave unit 30D This includes a case where power for operation is sufficient (the power of the other slave unit 30D is equal to or higher than a predetermined power).

  The power for operating the slave unit 30D (D1, D2) includes, for example, power for maintaining the measurement function, the wireless communication function, or the control function. That is, the power for operating the slave unit 30D (D1, D2) is, for example, the voltage detection unit 33A, the current detection unit 34A, the wireless communication unit 37D (37D1, 37D2), or the control unit 36D (36D1, 36D2). Includes power to operate.

  The power supply unit 32D1 is configured to be able to supply power to the other slave unit 30D. For example, the power supply unit 32D1 may be connected to another child device 30D by a power cable. The power supply unit 32D1 may perform non-contact power transmission or non-contact power reception, for example, by electromagnetic induction between the power supply unit 32D (for example, the power supply unit 32D2) of another child device 30D (for example, the child device 30D2).

  Therefore, it can be said that the subunit | mobile_unit 30D1 can receive electric power supply indirectly (via other subunit | mobile_unit 30D) from PV panel 20 or PV string 20ST other than the acquisition object of electric power generation information. That is, the PV panel 20 from which power generation information is acquired can be separated from the PV panel 20 that receives power supply. Even if an abnormality (for example, a decrease in power generation amount or a shadow) occurs in the PV panel 20, the slave unit 30D1 can operate and can notify power generation information.

  For example, the control unit 36D1 cooperates with another child device 30D accommodated in the second connection box 55, and holds data stored in each child device 30D (for example, power generation information of the PV panel 20 acquired by each child device 30D). ) May be shared. The shared data is stored in the memory of the slave unit 30D1 (not shown).

  For example, the control unit 36D1 monitors whether or not power for operating the slave unit 30D1 is sufficient. Whether the power for operating the slave unit 30D1 is sufficient is notified from the power supply unit 32D1, for example. For example, the control unit 36D1 monitors the wireless communication unit 37D1, and monitors whether there is sufficient power for the operation of the other child device 30D. Whether or not the power for operating the other slave unit 30D is sufficient is notified from the other slave unit 30D, for example.

  For example, the wireless communication unit 37D1 receives, from the other child device 30D, information indicating whether or not power for operating the other child device 30D is insufficient. For example, the wireless communication unit 37D transmits information on whether or not power for operating the slave unit 30D1 is insufficient to the other slave unit 30D.

  For example, the wireless communication unit 37D1 transmits the data held by the slave unit 30D1 to another slave unit 30D at a predetermined timing. The predetermined timing is, for example, a timing at which power generation information is obtained by the slave unit 30D1 that is periodically implemented. For example, the wireless communication unit 37D1 receives data held by the other child device 30D at a predetermined timing. Thereby, data can be shared among the plurality of slave units 30D.

  Data communicated by the wireless communication unit 37D1 may be wired. Wired communication includes, for example, power line communication via the power line PL.

  Here, although it was mainly about the subunit | mobile_unit 30D1, it is the same also about subunit | mobile_unit 30D2. In this case, the other child device 30D is, for example, the child device 30D1.

  Note that at least one of data sharing between the slave units 30D and transmission / reception of power between the slave units 30D may be performed. Either one of the configuration for implementing data sharing between the slave units 30D and the configuration for implementing transmission and reception of power between the slave units 30D may be omitted. By performing at least one of the above, the slave unit 30D1 can transmit data directly or indirectly to the master unit 80, for example, even if the slave unit 30D1 does not receive power from the PV panel 20 or the PV string 20ST from which the power generation information is acquired. Therefore, for example, the master unit 80 can recognize the power generation information held or acquired by the slave unit 30D1, and can detect an abnormality in the PV panel 20 or the PV string 20ST.

  As described above, when the power generation amount of the PV panel 20 from which the power generation information is acquired is equal to or less than the predetermined amount, the slave unit 30D1 connected to the PV panel 20 is generating a PV panel during power generation other than the power generation information acquisition target. It may operate by receiving power supply from 20 indirectly. When the power generation amount of the PV panel 20 becomes a predetermined amount or less, this corresponds to the power supplied from the PV panel 20 becoming a predetermined power or less. The subunit | mobile_unit 30D1 receives electric power supply from the subunit | mobile_unit 30D2 arrange | positioned in the 2nd junction box 55 near the subunit | mobile_unit 30D1, for example.

  Thereby, when the place where the second connection box 55 is arranged has a good wireless communication status, data (for example, power generation information) can be notified to the parent device 80. That is, even if the slave unit 30D1 has a communication failure, the operation voltage can be recovered when the communication failure is caused by a decrease in the operation voltage, so that the measurement function, the wireless communication function, and the control function can be maintained. Therefore, the slave unit 30D1 can directly notify the power generation information to the master unit 80. Moreover, when receiving electric power supply from other subunit | mobile_unit 30D arrange | positioned adjacently, the loss of the electric power received can be suppressed.

  Further, for example, the slave unit 30D1 may transmit and share data to be transmitted to the master unit 80 to another slave unit 30D, and the other slave unit 30D may transmit the data to the master unit 80. The communication destination may be other than the parent device 80.

  Thereby, even when it is not possible to receive power supply from the PV panel 20 from which the power generation information is acquired, the power generation information can be indirectly notified to the master unit 80 via the other slave unit 30D. Therefore, data communication between the child device 30D1 and the parent device 80 can be maintained. For example, the parent device 80 can detect an abnormality in the PV panel 20, the PV string 20ST, the PV cluster 20CL, or the PV array 20AR.

  In FIG. 15, the connection cable L1 and the extension cable L2 are shown. The PV panel 20 has a connection cable L1. The connection cable L1 is a cable from which the PV panel 20 outputs power generated by the PV panel 20. The subunit | mobile_unit 30D is connected to the connection cable L1. When the position of the slave unit 30D is arranged at a position where the signal strength is good, for example, the length of the connection cable L1 may be insufficient, and the slave unit 30D may not be connected. The extension cable L2 is a cable that supplements this shortage. The extension cable L2 is a cable that the slave unit 30D has, for example. The connection cable L1 and the extension cable L2 are connected via a connector. By using the extension cable L2, the power generated by the PV panel 20 can be reliably output to the slave unit 30D. The connection cable L1 and the extension cable L2 may be used in the photovoltaic power generation systems 10, 10A to 10C in the first to fourth embodiments.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Is also applicable.

  For example, in the above embodiment, the slave units 30A to 30D are exemplified to be provided for each PV string 20ST, but a plurality of slave units 30A to 30D are connected to the plurality of PV panels 20 in the PV string 20ST. Also good.

  Moreover, in 3rd Embodiment-5th Embodiment, although subunit | mobile_unit 30B-30D illustrated acquiring the power generation information of PV panel 20, you may acquire the power generation information of PV string 20ST. Therefore, the subunit | mobile_unit 30B-30D may transmit the electric power generation information about PV string 20ST to the main | base station 80, for example.

  In the above embodiment, the PV string 20ST including the plurality of PV panels 20 is illustrated, but the PV string 20ST may be composed of a single PV panel 20.

(Overview of one embodiment of the present invention)
The power generation monitoring device according to one aspect of the present invention is a power generation monitoring device that monitors a solar cell module or a solar cell string in which a plurality of solar cell modules are connected in series via a power line, the solar cell module or the solar cell An acquisition unit that acquires power generation information of the battery string; and a wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit, wherein the power generation monitoring device includes a communication signal communicated by the wireless communication unit. It is arranged at a position where the signal intensity is a predetermined value or more.

  According to this configuration, it is possible to suppress deterioration in the quality of wireless communication and improve the communication accuracy of data communication (for example, transmission of power generation information). Therefore, the accuracy of abnormality detection in the solar cell string or solar cell module to be acquired from which power generation information is acquired can be improved, and maintenance and maintenance work can be facilitated.

  The power generation monitoring device of one embodiment of the present invention is a signal at a position where the first power generation monitoring device and the second power generation monitoring device other than the power generation monitoring device are present and the first power generation monitoring device is disposed. When the strength is higher than the signal strength at the position where the second power generation monitoring device is disposed, the power generation monitoring device is disposed closer to the first power generation monitoring device than the second power generation monitoring device. The

  According to this configuration, it is possible to suppress deterioration in the quality of wireless communication and improve the communication accuracy of data communication (for example, transmission of power generation information).

  The power generation monitoring device of one embodiment of the present invention further includes an extension cable that connects the power generation monitoring device at a position where the signal intensity is equal to or higher than a predetermined value and the connection cable included in the solar cell module.

  According to this configuration, it is possible to suppress deterioration in the quality of wireless communication and improve the communication accuracy of data communication (for example, transmission of power generation information).

  In addition, the power generation monitoring device of one embodiment of the present invention is arranged in a connection box in which a plurality of solar cell modules are connected in parallel.

  According to this configuration, when the wireless communication state in the connection box is good, the power generation monitoring device is arranged in the connection box, thereby suppressing deterioration in the quality of wireless communication and improving the communication accuracy of data communication. .

  Moreover, the power generation monitoring device of one embodiment of the present invention is arranged in a storage box different from the connection box connected to the solar cell string.

  According to this configuration, when the wireless communication state in the storage box is good, the power generation monitoring device is arranged in the storage box, thereby suppressing deterioration in the quality of wireless communication and improving the communication accuracy of data communication. . Moreover, the influence of the electrical components (for example, backflow prevention diode) accommodated in the connection box can be suppressed, and further the communication accuracy of data communication can be improved.

  In the power generation monitoring device of one embodiment of the present invention, the solar cell string includes a first solar cell module and a second solar cell module, and the first solar cell module is a second solar cell module. The amount of received light is more than a predetermined amount, and the acquisition unit acquires the power generation information of the first solar cell module.

  According to this configuration, when there is no abnormality, the amount of power generated by the first solar cell module is equal to or greater than a predetermined amount, so that power generation information (for example, current, voltage, power measurement information, abnormality information) Good notification. Moreover, sufficient electric power supply can be received from a 1st solar cell module, and it can operate | move stably (for example, operation | movement of an acquisition part and a radio | wireless communication part).

  The power generation monitoring device of one embodiment of the present invention includes a housing that houses the acquisition unit and the wireless communication unit, and a rigid connector is directly connected to the housing.

  According to this configuration, the cable for connecting the power generation monitoring device to another device can be prevented from being entangled, and a load on the cable due to the weight of the casing of the power generation monitoring device itself can be prevented. Therefore, disconnection of the power line or signal line can be suppressed, and a good power generation state can be maintained. In addition, for example, it is possible to suppress a load on the packing when the cable is inserted, and it is possible to suppress a decrease in waterproofness and dustproofness. For example, when connecting another power generation monitoring device and a connector, the power generation monitoring device can be installed compactly according to various installation environments where the power generation monitoring device is installed, installation can be facilitated, and installation efficiency can be improved.

  Further, in the power generation monitoring device of one embodiment of the present invention, the connector includes a pair of first connectors connected to a solar cell module to be acquired for acquiring power generation information by the acquisition unit, and a sun other than the acquisition target. A pair of second connectors connected to backflow prevention diodes arranged for each battery module or solar cell string, and the first connector and the second connector are asymmetric in a predetermined plane It is in.

  According to this configuration, for example, it is possible to suppress the possibility that the first connector and the second connector are erroneously connected during construction.

  In the power generation monitoring device of one embodiment of the present invention, the housing is housed in a housing box, and the wireless communication unit performs wireless communication using a communication antenna provided in the housing box.

  According to this configuration, for example, regardless of the state of the antenna of the power generation monitoring device, stable communication can be performed using the antenna of the storage box in which the wireless communication state is good.

  The power generation monitoring system according to one aspect of the present invention is a power generation monitoring system including a plurality of power generation monitoring devices that monitor a solar cell module or a solar cell string in which a plurality of solar cell modules are connected in series via a power line. The power generation monitoring device includes an acquisition unit that acquires power generation information of the solar cell module or solar cell string, and a wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit, and each power generation monitoring device Are intensively arranged at a position where the signal strength of the communication signal communicated by the wireless communication unit is a predetermined value or more.

  According to this configuration, it is possible to suppress variations in the wireless communication status in which each power generation monitoring device is installed. Therefore, it is possible to suppress deterioration in the quality of wireless communication and improve the communication accuracy of data communication (for example, transmission of power generation information). Therefore, the accuracy of abnormality detection in the solar cell string or solar cell module to be acquired from which power generation information is acquired can be improved, and maintenance and maintenance work can be facilitated.

  In the power generation monitoring system of one embodiment of the present invention, each power generation monitoring device is intensively arranged in a connection box to which a plurality of solar cell strings are connected in parallel.

  According to this configuration, when the wireless communication state in the connection box is good, a plurality of power generation monitoring devices are intensively arranged in the connection box, thereby suppressing deterioration in the quality of wireless communication by each power generation monitoring device. In addition, the communication accuracy of data communication can be improved.

  In the power generation monitoring system of one embodiment of the present invention, each power generation monitoring device is concentratedly arranged in a storage box different from a connection box connected to the solar cell string.

  According to this configuration, when the wireless communication state in the connection box is good, a plurality of power generation monitoring devices are intensively arranged in the connection box, thereby suppressing deterioration in the quality of wireless communication by each power generation monitoring device. In addition, the communication accuracy of data communication can be improved.

  In the power generation monitoring system of one embodiment of the present invention, each power generation monitoring device uses a communication antenna provided in the housing box as a common antenna.

  According to this configuration, each power generation monitoring device can perform wireless communication with substantially uniform communication characteristics regardless of the communication characteristics of the communication antenna in each power generation monitoring device.

  Further, in the power generation monitoring system according to one aspect of the present invention, the power generation monitoring device is supplied with power from an acquisition target solar cell string or an arbitrary solar cell module in the solar cell string from which the acquisition unit acquires power generation information, A power supply unit that supplies power to the acquisition unit and the wireless communication unit, a plurality of power generation monitoring devices include a first power generation monitoring device and a second power generation monitoring device, the first power generation monitoring device, The power generation information acquired by the acquisition unit of the second power generation monitoring device is shared with the second power generation monitoring device, and the acquisition target solar cell string or solar cell of the second power generation monitoring device When the power supplied from any solar cell module in the string to the second power generation monitoring device is equal to or lower than a predetermined power, the power generation information of the shared second power generation monitoring device To send.

  According to this configuration, even when the power supplied from the solar cell string or the solar cell module is insufficient with respect to the first power generation monitoring device, the first power generation monitoring device passes through the second power generation monitoring device. The power generation information acquired by the first power generation monitoring device can be transmitted. Thereby, the occurrence of an abnormality can be detected based on the power generation information acquired by the first power generation monitoring device.

  Further, in the power generation monitoring system according to one aspect of the present invention, the power generation monitoring device is supplied with power from an acquisition target solar cell string or an arbitrary solar cell module in the solar cell string from which the acquisition unit acquires power generation information, A power supply unit that supplies power to the acquisition unit and the wireless communication unit, a plurality of power generation monitoring devices include a first power generation monitoring device and a second power generation monitoring device, the first power generation monitoring device, When the power supplied from the solar cell string to be acquired or any solar cell module in the solar cell string to acquire power generation information by the acquisition unit of the second power generation monitoring device is equal to or lower than a predetermined power, the second power generation Supply power to the monitoring device.

  According to this configuration, even when the power supplied from the solar cell string or the solar cell module is insufficient for the first power generation monitoring device, the first power generation monitoring device supplies power from the second power generation monitoring device. It is possible to operate by receiving. Accordingly, the first power generation monitoring device can maintain the wireless communication function, and can detect the occurrence of abnormality based on the power generation information acquired by the first power generation monitoring device.

  The present invention is useful for a power generation monitoring device, a power generation monitoring system, and the like that can improve the communication accuracy of data communication.

10, 10A, 10B, 10C, 10D Solar power generation system 20 PV panel 20AR PV array 20C PV cell 20CL PV cluster 20G PV cell group 20ST PV string 30, 30A, 30B, 30C, 30D, 30D1, slave unit 31 housing 31a Connector connection part 31b Case side wall part 32, 32D, 32D1, 32D2 Power supply part 33, 33A Voltage detection part 34, 34A Current detection part 36, 36D, 36D1, 36D2 Control part 37, 37D, 37D1, 37D2 Wireless communication part 38 , 38A input terminal 39, 39A output terminal 40 connection box 42 backflow prevention diode 45, 45a, 45b connector 46 common antenna 47 washer 48 cable 49 signal cable 50 current collection box 53 mounting bracket 55 second connection box 60 power conditioner Shona 70 gateway 80 parent unit

Claims (15)

A power generation monitoring device that monitors a solar cell string in which a solar cell module or a plurality of solar cell modules are connected in series via a power line,
An acquisition unit for acquiring power generation information of the solar cell module or the solar cell string;
A wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit;
With
The said power generation monitoring apparatus is a power generation monitoring apparatus arrange | positioned in the position where the signal strength of the communication signal communicated by the said wireless communication part is more than predetermined value. The power generation monitoring device according to claim 1,
There is a first power generation monitoring device and a second power generation monitoring device other than the power generation monitoring device, and the signal strength at the position where the first power generation monitoring device is disposed is the second power generation monitoring device. Higher than the signal strength at
The power generation monitoring device is a power generation monitoring device arranged closer to the first power generation monitoring device than the second power generation monitoring device. The power generation monitoring device according to claim 1 or 2,
A power generation monitoring apparatus further comprising an extension cable that connects the power generation monitoring apparatus at a position where the signal intensity is equal to or greater than a predetermined value and the connection cable of the solar cell module. The power generation monitoring device according to any one of claims 1 to 3,
A power generation monitoring device arranged in a junction box in which a plurality of solar cell modules are connected in parallel. The power generation monitoring device according to any one of claims 1 to 3,
A power generation monitoring device disposed in a storage box different from a connection box connected to the solar cell string. The power generation monitoring device according to any one of claims 1 to 5,
The solar cell string includes a first solar cell module and a second solar cell module,
In the first solar cell module, the amount of received light is more than a predetermined amount more than the second solar cell module,
The acquisition unit is a power generation monitoring device that acquires power generation information of the first solar cell module. The power generation monitoring device according to any one of claims 1 to 6, further comprising:
A housing for accommodating the acquisition unit and the wireless communication unit;
A power generation monitoring apparatus in which a rigid connector is directly connected to the housing. The power generation monitoring device according to claim 7,
The connector includes a pair of first connectors connected to an acquisition target solar cell module that acquires power generation information by the acquisition unit, and a backflow prevention arranged for each of the solar cell modules or solar cell strings other than the acquisition target. A pair of second connectors connected to the diode;
The power generation monitoring device in which the first connector and the second connector are in an asymmetric positional relationship on a predetermined plane. The power generation monitoring device according to claim 7 or 8,
The housing is accommodated in a storage box,
The wireless communication unit is a power generation monitoring device that performs wireless communication using a communication antenna provided in the storage box. A power generation monitoring system comprising a plurality of power generation monitoring devices for monitoring a solar cell module or a solar cell string in which a plurality of solar cell modules are connected in series via a power line,
The power generation monitoring device is
An acquisition unit for acquiring power generation information of the solar cell module or the solar cell string;
A wireless communication unit that wirelessly communicates the power generation information acquired by the acquisition unit;
With
Each power generation monitoring device is a power generation monitoring system that is intensively arranged at a position where the signal intensity of a communication signal communicated by the wireless communication unit is a predetermined value or more. The power generation monitoring system according to claim 10, wherein
Each power generation monitoring device is a power generation monitoring system that is centrally arranged in a connection box in which a plurality of solar cell strings are connected in parallel. The monitoring system according to claim 10, wherein
Each power generation monitoring device is a power generation monitoring system that is centrally arranged in a storage box that is different from a connection box connected to the solar cell string. The monitoring system according to claim 12, comprising:
Each power generation monitoring device is a power generation monitoring system that uses a communication antenna provided in the housing box as a common antenna. The monitoring system according to any one of claims 10 to 12,
The power generation monitoring device is supplied with power from an acquisition target solar cell string or an arbitrary solar cell module in the solar cell string for acquiring power generation information by the acquisition unit, and supplies power to the acquisition unit and the wireless communication unit With power supply,
The plurality of power generation monitoring devices includes a first power generation monitoring device and a second power generation monitoring device,
The first power generation monitoring device shares power generation information acquired by the acquisition unit of the second power generation monitoring device with a second power generation monitoring device, and the second power generation monitoring device When the electric power supplied from the solar cell string to be acquired or an arbitrary solar cell module in the solar cell string to the second power generation monitoring device is equal to or less than a predetermined power, the shared power generation information of the second power generation monitoring device Transmit power generation monitoring system. The monitoring system according to any one of claims 10 to 12,
The power generation monitoring device is supplied with power from an acquisition target solar cell string or an arbitrary solar cell module in the solar cell string for acquiring power generation information by the acquisition unit, and supplies power to the acquisition unit and the wireless communication unit With power supply,
The plurality of power generation monitoring devices includes a first power generation monitoring device and a second power generation monitoring device,
In the first power generation monitoring device, the power supplied from the solar cell string to be acquired or the arbitrary solar cell module in the solar cell string that acquires the power generation information by the acquisition unit of the second power generation monitoring device is equal to or lower than the predetermined power. A power generation monitoring system that supplies power to the second power generation monitoring device.

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