JP2017051083A - Power generation system, power generation method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation system which can effectively use a surplus power at load restriction.SOLUTION: The power generation system includes: a solar panel; an energy conversion device which converts electric energy into predetermined energy; a storage battery which is charged by power generated by the solar panel; a first power conversion device which causes an inverse power flow generated by the solar panel into an electric power system; a second power conversion device which controls the charge and discharge of the storage battery; and a third power conversion device which converts the generation power of the solar panel or the discharge power of the storage battery into predetermined power, to supply to an energy conversion device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power generation system, a power generation method, and a program.

  Renewable energy has been attracting attention, and in particular, solar power generation is easy to install and can be installed from small to large facilities ranging from rooftop power generation to mega solar. It is rapidly spreading due to the factors listed above. (1) Setting the introduction target by the government, (2) Legalization of electricity sales through the fixed purchase system, (3) Expansion of the subsidy system by the government and local governments, and (4) No emission of greenhouse gases. From this social background, the introduction of photovoltaic power generation is expected to expand further in the future. However, on the other hand, when the solar power generation system is connected to the power system, there is a concern about the influence on the stability of the power system.

  The power generation capacity of solar power generation depends on the natural environment such as the weather, the power generation amount varies depending on the amount of solar radiation and temperature, and the power generation amount increases or decreases depending on the weather. Electric power companies adjust the output fluctuations of photovoltaic power generation and adjust the output of centralized power sources such as pumping, gas turbines and thermal power to maintain the balance between supply and demand of the power system. If the amount of photovoltaic power generation introduced exceeds a certain level, there is a possibility that the output fluctuation of solar power generation cannot be adjusted and the stability of the power system cannot be secured.

  For this reason, on the day when adjustment power shortage is assumed, some solar power generation is restricted or stopped. When the power sale is restricted or stopped, the generated power of the photovoltaic power generation that should be originally obtained is discarded as surplus power.

  Under the circumstances described above, there is a demand for a system that effectively uses the generated power when the output of solar power generation is limited. As an example of such a system, there is a system described in Patent Document 1. The system described in Patent Document 1 is a system that adjusts the output to a commercial system using a storage battery when the output is limited. Therefore, for example, when it is intended to be applied to a large-scale system such as a mega solar, there is a problem that a storage battery capacity required for power storage increases and a great cost is generated.

JP 2012-75224 A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a power generation system, a power generation method, and a program that can effectively utilize surplus power at the time of output limitation.

  In order to solve the above problems, an aspect of the power generation system of the present invention includes a solar panel, an energy conversion device that converts electrical energy into predetermined energy, a storage battery that is charged by electric power generated by the solar panel, A first power conversion device that reversely flows power generated by the solar panel to the power system, a second power conversion device that controls charging / discharging of the storage battery, and the generated power of the solar panel or the discharge power of the storage battery A third power conversion device that converts the power into power and supplies the power to the energy conversion device.

  In addition, according to an aspect of the present invention, in the power generation system described above, the first power conversion device controls the power to be reversely flowed to the power system so that the power is less than or equal to an output limit value for the power system, and the second The power converter controls charging / discharging of the storage battery so that the power supplied from the third power converter to the energy converter is stabilized.

  Moreover, 1 aspect of this invention is further equipped with the circuit breaker which connects or interrupts | blocks the said 2nd power converter device with respect to the output of the said solar panel in said electric power generation system.

  In addition, according to one aspect of the present invention, in the above power generation system, the first power conversion device and the second power conversion device have a function of performing maximum power tracking control of the solar panel.

  Moreover, one aspect of the power generation method of the present invention is a first power using a solar panel, an energy conversion device that converts electrical energy into predetermined energy, and a storage battery that is charged by the power generated by the solar panel. The power generated by the solar panel by the conversion device is reversely flowed to the power system, the charge / discharge of the storage battery is controlled by the second power conversion device, and the generated power of the solar panel or the discharge of the storage battery by the third power conversion device Electric power is converted into predetermined electric power and supplied to the energy conversion device.

  Moreover, one aspect of the program of the present invention is the first power conversion using a solar panel, an energy conversion device that converts electrical energy into predetermined energy, and a storage battery that is charged by the power generated by the solar panel. The power generated by the solar panel by the device is reversely flowed to the power system, the charge / discharge of the storage battery is controlled by the second power conversion device, and the generated power of the solar panel or the discharge power of the storage battery by the third power conversion device Is converted into predetermined power and supplied to the energy conversion device by a computer.

  According to the present invention, surplus power can be converted into predetermined energy using the energy conversion device, so that surplus power at the time of output limitation can be effectively utilized.

It is a schematic block diagram which shows the basic structural example of embodiment of the electric power generation system 100 by this invention. 3 is a flowchart for explaining an operation example of the power generation system 100 shown in FIG. 1. It is a figure for demonstrating the operation example of the electric power generation system 100 shown in FIG. It is a figure for demonstrating the operation example of the electric power generation system 100 shown in FIG. It is a figure for demonstrating the operation example of the electric power generation system 100 shown in FIG. It is a figure for demonstrating output restrictions. It is a figure for demonstrating the change of the electric power supplied to the energy converter device shown in FIG. It is a schematic block diagram which shows 100 A of electric power generation systems which are the other structural examples of embodiment by this invention.

  Hereinafter, embodiments of a power generation system according to the present invention will be described with reference to the drawings. A power generation system 100 of the present embodiment illustrated in FIG. 1 includes a first power conversion device 101, a second power conversion device 102, a third power conversion device 103, a PV (Photovoltaic) panel (solar panel) 104, A storage battery 105, an energy conversion device 106, a circuit breaker 107, a control device 108, and a wattmeter 109 are provided. The first power converter 101 connects the DC input terminal to the DC output terminal of the PV panel 104 and connects the AC output terminal to the commercial system (power system) 200 via the wattmeter 109. The second power converter 102 has two DC input / output terminals, one connected to the DC output terminal of the PV panel 104 via the circuit breaker 107 and the other connected to the DC input / output terminal of the storage battery 105. . The third power converter 103 connects the DC input terminal to the DC input / output terminal of the second power converter 102 and the circuit breaker 107, and the DC (or AC) output terminal to the DC (or AC) of the energy converter 106. Connect to the input terminal.

The first power conversion device 101 is a device that converts DC power generated by the PV panel 104 into AC power and causes the commercial system 200 to reversely flow. The first power conversion device 101 can be configured using, for example, a grid-connected PCS (power conditioner). The first power converter 101 is, for example, a DC / DC converter (DC-DC converter) for performing constant voltage output of the PV panel 104 and maximum power tracking control (MPPT (Maximum Power Point Tracking) control). And an inverter that converts direct current to alternating current, a grid connection protection device, and the like.
In this embodiment, the 1st power converter device 101 monitors the output voltage and output current of the PV panel 104 using the measurement part which is not illustrated, and performs MPPT control. However, the MPPT control can be executed or stopped by an instruction from the control device 108. Further, in the present embodiment, the first power conversion device 101 controls the power flowing backward to the commercial system 200 to be the maximum allowable power according to the output limit value instructed from the control device 108. It is also possible to have a function. The output limit value is based on an output limit command specified by an electric power company or the like, and is specified as a ratio with respect to the rated output of the first power converter 101. For example, when the output limit value is 0%, the first power converter 101 stops and the reverse power flow becomes zero. Further, for example, when the output limit value is 100%, the first power converter 101 reversely flows power having a magnitude up to the rated output.

  The second power conversion device 102 is a bidirectional DC / DC converter, converts the output voltage of the PV panel 104 into a predetermined voltage and applies it to the storage battery 105 to charge the storage battery 105, or the output voltage of the storage battery 105 The voltage is converted into a predetermined voltage, applied to the third power converter 103 and discharged from the storage battery 105. The second power conversion device 102 controls the charge / discharge power in the charge / discharge control so that the voltage and current input to the third power conversion device 103 are stabilized, or based on an instruction input from the control device 108. And control. Moreover, the 2nd power converter device 102 monitors the output voltage and output current of the PV panel 104 using the measurement part which is not shown in figure, and performs MPPT control. However, the MPPT control is set to an execution state or a stop state according to an instruction from the control device 108.

  The third power converter 103 is a DC / DC converter or a DC / AC inverter (DC-AC converter), and generates the generated power of the PV panel 104 or the discharged power from the storage battery 105 output by the second power converter 102. As an input, it is converted into DC power or AC power of a predetermined voltage and supplied to the energy conversion device 106. The third power conversion device 103 alone or in cooperation with the power consumption control of the energy conversion device 106 in accordance with the instruction input from the control device 108. Control based on.

  The PV 104 is a panel composed of a plurality of solar cells, and is also called a solar cell panel, a solar cell module, or the like.

  The storage battery 105 is a secondary battery, is charged by the power generated by the PV panel 104, converts electrical energy into chemical energy, and stores the energy. The storage battery 105 is, for example, a lead storage battery, a lithium ion battery, a nickel hydrogen battery, a sodium sulfur battery, or the like. The storage battery 105 may include a plurality of types of storage batteries. The storage battery 105 may be replaced with, for example, an electric double layer capacitor that stores electric energy as electric energy.

  The energy conversion device 106 is an energy conversion device that converts electrical energy supplied from the third power conversion device 103 into predetermined energy. As the energy conversion device 106, a hydrogen generation device that converts electrical energy into hydrogen energy (hydrogen fuel), a flywheel that converts kinetic energy, a pumping system that converts potential energy, a heat pump or electric heater that converts thermal energy, Examples include a compressor that converts pressure energy, and a superconducting power storage device that converts magnetic energy. The energy conversion device 106 may have a plurality of types.

  The circuit breaker 107 is a contact inserted in the connection cable between the PV panel 104 and the second power conversion device 102 and the third power conversion device 103, and the contact is set according to the control signal output from the control device 108. Open and close.

  The control device 108 includes a computer and a communication device. The control device 108 includes a first power conversion device 101, a second power conversion device 102, a third power conversion device 103, an energy conversion device 106, a circuit breaker 107, and a power meter via a wireless or wired signal line (not shown). 109, connected to each unit such as a measurement unit (not shown) that measures the output voltage and output current of the PV panel 104, and controls each unit by transmitting and receiving predetermined measurement / control signals, and obtains information from each unit Or Further, the control device 108 has a function of receiving an output restriction command instructed by an electric power company or the like.

  The wattmeter 109 measures the power flowing backward from the first power converter 101 to the commercial system 200. The commercial system 200 is an electric power system provided by an electric power company or the like.

Here, the concept of the basic operation of the power generation system 100 will be described with reference to FIG.
FIG. 6 is a diagram showing an example of the relationship between the output limit value and the output of the PV panel 104. The horizontal axis is time, and the vertical axis is power. In FIG. 6, the rated output of the first power converter 101 is indicated by a thin broken line. The output limit value is shown as a ratio to the rated output of the first power converter 101 and is indicated by a thick broken line. The output of the PV panel 104 is indicated by a solid line. When the output limit is not issued, the output limit value is 100%, and when no power can be sold due to the output limit, the output limit value is 0%. The “surplus power” portion shaded in FIG. 6 indicates power that cannot be sold.

  The power generation system 100 according to the present embodiment converts surplus power electrical energy that cannot be reversely flowed to the commercial system 200 illustrated in FIG. 6 into predetermined energy by the energy conversion device 106. In general, it is desirable that the power supplied to the energy conversion device 106 is stable, that is, the voltage and current are constant. However, the generated power of the PV panel 104 may be unstable. Therefore, in the power generation system 100, the energy conversion device is supplied by supplying the power discharged from the storage battery 105 to the energy conversion device 106 or charging the storage battery 105 with the generated power of the PV panel 104 under the control of the control device 108. The power supplied to 106 is stabilized.

  In the present embodiment, stabilization of the power supplied to the energy conversion device 106 has the following meaning. That is, it means that the magnitude of the power supplied to the energy conversion device 106 is continuously maintained for a certain period of time at a level equal to or higher than the minimum power required for operation of the energy conversion device 106 (referred to as operation minimum power). This is due to the following reason. That is, when the operation and stop of the energy conversion device 106 are frequently repeated, for example, in the case of a hydrogen generation device, some adverse effects on the energy conversion device 106 such as electrode deterioration may be considered. Therefore, it can be said that the power supply in which operation and stop must be repeated frequently is unstable, and in this embodiment, the stabilization of power is defined in the above sense. The control device 108 controls the charge / discharge power of the storage battery 105 based on the output state of the PV panel 104, the storage state of the storage battery 105, the output limit value, the measured value of the wattmeter 109, and the like.

Further, when the amount of energy to be converted can be varied according to the amount of power supplied by the energy conversion device 106, stabilization of the power supplied to the energy conversion device 106 in the present embodiment means the following. It has. In this case, the energy conversion device 106 consumes all of the supplied power by changing the magnitude of energy to be converted, for example, when the supplied power changes between the minimum operating power of the energy conversion device 106 and the rated power. can do. However, as shown in FIG. 7, when the supply power repeatedly changes suddenly, for example, in the case of a hydrogen generation device, it is assumed that some adverse effect is exerted on the energy conversion device 106 such as electrode deterioration. Here, FIG. 7 is a diagram schematically showing a change in power supply with time.
In the present embodiment, the control device 108 controls the charge / discharge power of the storage battery 105 based on the output state of the PV panel 104, the storage state of the storage battery 105, the value of the output limit value, the measured value of the wattmeter 109, and the like. 7 can be adjusted with reference to a target value indicated by a chain line, for example. In this case, the stabilization of the power supplied to the energy conversion device 106 is to control the magnitude of the supplied power based on a certain target value in the range from the minimum operating power to the rated power. Can do. The reference target value may have a certain width.

  Next, an operation example of the power generation system 100 illustrated in FIG. 1 will be described with reference to FIGS. FIG. 2 is a flowchart showing a flow of processing executed by the control device 108 shown in FIG. The process shown in FIG. 2 is executed when the power generation system 100 is activated or when the control device 108 receives an output restriction command. 3 to 5 show the power flow and the operating state of the circuit breaker 107 when the output limit value = 100%, 0% <output limit value <100%, and the output limit value = 0%, respectively. It is a figure.

  Hereinafter, the operation of the power generation system 100 will be described for each output limit value.

  B) Output limit value = 100% (output stop) (see Fig. 3)

  First, the control device 108 closes the circuit breaker 107 (step S101: since it is 100%, step S102). Next, the control apparatus 108 stops the 1st power converter device 101 (step S103). Next, the control apparatus 108 starts charge / discharge control of the storage battery 105 by the 2nd power converter device 102 (step S104). Next, the control apparatus 108 starts the output of the 3rd power converter device 103 (step S105). And the control apparatus 108 starts MPPT control with the 2nd power converter device 102 (step S106).

  In this case, as shown in FIG. 3, the first power converter 101 stops and does not input / output power. The power generated by the PV panel 104 is basically all used by the energy conversion device 106. However, in order to stably operate the energy conversion device 106, the power supplied to the energy conversion device 106 is stabilized by compensating the output fluctuation of the PV panel 104 with the storage battery 105. The output of the storage battery 105 (that is, the set value of the discharge power) can be controlled by the control device 108 according to the generated power of the PV panel 104, for example. In this case, since the first power converter 101 is stopped and the MPPT control by the first power converter 101 cannot be performed, the MPPT control is executed by the second power converter 102, and the output power of the PV panel 104 is Maximized.

  B) When 0% <output limit value <100% (see Fig. 4)

  First, the control device 108 closes the circuit breaker 107 (step S101: since it is larger than 0% and smaller than 100%, step S107). Next, the control device 108 sets the maximum value of the reverse flow power to the power limit value in the first power conversion device 101 and starts the reverse flow control (step S108). Next, the control apparatus 108 starts MPPT control by the 1st power converter device 101 (step S109). Next, the control apparatus 108 starts charge / discharge control of the storage battery 105 by the 2nd power converter device 102 (step S110). And the control apparatus 108 starts the output of the 3rd power converter device 103 (step S111).

  In this case, the control device 108 controls the power sold, that is, the power supplied to the energy conversion device 106 and the charge / discharge power of the storage battery so that the measured value of the power meter 109 in FIG. Further, in order to stably operate the energy conversion device 106, the power supplied to the energy conversion device 106 is stabilized by compensating the output from the PV panel 104 or the fluctuation of the output limit value by the storage battery 105. The output of the storage battery 105 is controlled by the control device 108.

  C) Output limit value = 0% (outputs all generated power) (see Fig. 5)

  First, the control device 108 opens the circuit breaker 107 (step S101: 0% because it is 0%). Next, the control device 108 sets the maximum value of the reverse flow power to the rated power in the first power conversion device 101 and starts the reverse flow control (step S113). Next, MPPT control is started by the first power converter 101 (step S114). Next, the control apparatus 108 starts the discharge control of the storage battery 105 by the 2nd power converter device 102 (step S115). And the control apparatus 108 starts the output of the 3rd power converter device 103 (step S116).

  In this case, the power generation system 100 opens the circuit breaker 107 connected to the primary side of the second power converter 102 and sells the generated power to the entire commercial system. In this case, when the amount of power stored in the storage battery 105 remains, power is supplied to the energy conversion device 106 as necessary. The output of the storage battery 105 is controlled by the control device 108.

  As described above, in the present embodiment, surplus power of solar power generation can be converted into predetermined energy using the energy conversion device 106, so that surplus power at the time of output limitation can be effectively utilized.

  Further, in the power generation system 1010, the power that the first power conversion device 101 flows backward to the commercial system 200 is controlled so as to be equal to or less than the output limit value for the commercial system 200, and the second power conversion device 102 includes the third power. Charging / discharging of the storage battery 105 is controlled so that the electric power which the converter 103 supplies to the energy converter 106 is stabilized. Therefore, the power selling power can be stably controlled below the upper limit of the output limit value, and the power supplied to the energy conversion device 106 can be stabilized.

  In addition, the power generation system 100 includes a circuit breaker 107 that connects or disconnects the second power converter 102 to the output of the PV panel 104. Therefore, when the output limit value is 100%, the generated power of the PV panel 104 can be sold to the rated output with a small loss, and the energy conversion device 106 can be operated by discharging the storage battery 105. .

  In the power generation system 100, the first power conversion device 101 and the second power conversion device 102 have a function of performing MPPT control of the PV panel 104. Therefore, the MPPT control can be performed by the second power converter 102 when the first power converter 101 is stopped or when the reverse flow power is controlled to a predetermined constant value.

  Hereinafter, another configuration example of the power generation system according to the present embodiment will be described with reference to the drawings. The power generation system 100A of the present embodiment illustrated in FIG. 8 includes a first power conversion device 101, a second power conversion device 102, a third power conversion device 103, a PV panel 104_1, a PV panel 104_2, and a PV panel. 104_3, storage battery 105, energy conversion device 106, changeover switch 107_1, changeover switch 107_2, changeover switch 107_3, control device 108A, and wattmeter 109 are provided. The same components as those in FIG. 1 are denoted by the same reference numerals. Here, each of the PV panel 104_1, the PV panel 104_2, and the PV panel 104_3 has the same configuration as the PV panel 104 described above.

In this other configuration example, a changeover switch (107_1, 107_2, 107_3) is provided between the first power conversion device 101 and the second power conversion device 102 and the third power conversion device 103.
The changeover switch 107_1 is a switch that electrically connects any one of the first power conversion device 101, the second power conversion device 102, and the third power conversion device 103 to the PV panel 104_1. Similarly, the changeover switch 107_2 is a switch for electrically connecting any one of the first power conversion device 101, the second power conversion device 102, and the third power conversion device 103 to the PV panel 104_2. The changeover switch 107_3 is a switch for electrically connecting any one of the first power conversion device 101, the second power conversion device 102, and the third power conversion device 103 to the PV panel 104_3.

  The control device 108A includes a computer, a communication device, and the like, similar to the control device 108 already described. The control device 108A includes a first power conversion device 101, a second power conversion device 102, a third power conversion device 103, an energy conversion device 106, a changeover switch 107_1, and a changeover switch via a wireless or wired signal line (not shown). 107_2, changeover switch 107_3, wattmeter 109, PV panel 104_1, PV panel 104_2, PV panel 104_3 are connected to each unit such as a measurement unit (not shown) that measures the output voltage and output current, and predetermined measurement / control signals are sent. Each part is controlled by transmitting and receiving, and information is acquired from each part. Further, the control device 108A has a function of receiving an output restriction command instructed by an electric power company or the like.

  Thus, according to another embodiment, as shown below, the generated power of each of the PV panel 104_1, the PV panel 104_2, and the PV panel 104_3 can be reversely flowed to the commercial system 200 in accordance with the output limit value. .

  A) Output limit value = 100% (output stop)

  The control device 108A controls each of the changeover switch 107_1, the changeover switch 107_2, and the changeover switch 107_3, and the outputs of the PV panel 104_1, PV panel 104_2, and PV panel 104_3 are the second power conversion device 102 and the third power conversion device, respectively. 103 is connected. At this time, the outputs of the PV panel 104_1, the PV panel 104_2, and the PV panel 104_3 are not connected to the first power converter 101 because the reverse power flow control is not performed. Then, control device 108A starts charge / discharge control of storage battery 105 by second power conversion device 102. Further, the control device 108A starts the output of the third power conversion device 103, and starts the MPPT control by the second power conversion device 102. At this time, the control device 108A stops the first power conversion device 101.

  In this case, as shown in FIG. 3, the first power converter 101 stops and does not input / output power. The power generated by the PV panel 104_1, the PV panel 104_2, and the PV panel 104_3 is basically used by the energy conversion device 106. However, in order to stably operate the energy conversion device 106, the power supplied to the energy conversion device 106 is stabilized by compensating the output fluctuation of the PV panel 104 with the storage battery 105. At this time, since the first power conversion device 101 is stopped and the MPPT control by the first power conversion device 101 cannot be performed, the MPPT control is executed by the second power conversion device 102, and the PV panel 104 and the PV panel 104_2. , The output power of each of the PV panels 104_3 is maximized.

  B) 0% <Output limit value <100%

  The control device 108A controls each of the changeover switch 107_1, the changeover switch 107_2, and the changeover switch 107_3, and the PV panel 104_1, the PV panel 104_2, and the PV panel 104_2, PV Each of the panels 104_3 is connected to one of the first power conversion device 101, the second power conversion device 102, and the third power conversion device 103.

  For example, when only the generated power of the PV panel 104_1 is reversely flowed to correspond to the output limit value, the control device 108A sets the changeover switch 107_1 to connect the PV panel 104_1 and the first power conversion device 101. Control. Further, the control device 108A controls the changeover switch 107_2 and the changeover switch 107_3 so that each of the PV panel 104_2 and the PV panel 104_3 is connected to the second power conversion device 102 and the third power conversion device 103. At this time, since the PV panel 104_2 and the PV panel 104_3 are not connected to the first power conversion device 101, the MPPT control by the first power conversion device 101 cannot be performed on each of the PV panel 104_2 and the PV panel 104_3. For this reason, the MPPT control is executed by the second power converter 102, and the output power of each of the PV panel 104_2 and the PV panel 104_3 is maximized.

  C) Output limit value = 0% (outputs all generated power)

The control device 108A controls each of the changeover switch 107_1, the changeover switch 107_2, and the changeover switch 107_3 so that all of the generated power flows backward to the commercial system 200 so that the PV panel 104_1, the PV panel 104_2, and the PV panel 104_3. Are connected to the first power conversion device 101.
Thus, the power generation system 100A opens the second power conversion device 102 and the third power conversion device 103 from the PV panel 104_1, the PV panel 104_2, and the PV panel 104_3, and sells the entire amount of power generation output to the commercial system ( Reverse power flow control). In addition, when the storage amount of the storage battery 105 remains, electric power is supplied to the energy conversion device 106 as necessary. The output of the storage battery 105 is controlled by the control device 108A.

  As described above, in the other embodiments, the surplus power of the photovoltaic power generation can be converted into predetermined energy using the energy conversion device 106, as in the already described embodiments, so that the surplus at the time of output limitation Electric power can be used effectively.

  In other configuration examples, when the reverse power flow is not performed on the commercial system 200, unlike the embodiment shown in FIG. 3, the first power converter 101, the second power converter 102, and the third power converter. 103 is not directly connected, and the second power converter 102 and the third power converter 103 are not connected to the first power converter 101. Thereby, in other embodiment, when the 1st power converter device 101 and the 2nd power converter device 102 perform each MPPT control of PV panel 104_1, PV panel 104_2, and PV panel 104_3, it mutually interferes, respectively. Since there is no match, MPPT control by each of the first power converter 101 and the second power converter 102 is performed with high accuracy.

  In addition, a changeover switch (such as the changeover switch 107_1) in other embodiments may be applied to the configuration of the embodiment in FIG.

  The embodiment of the present invention is not limited to the above. For example, the second power conversion device 102 and the third power conversion device 103 may be configured as a single unit, or the control device 108, the second power conversion device 102, and the third power conversion unit 103 may be configured as a single unit. it can. In addition, the power generation system 100 and the power generation system 100A according to the present embodiment are not limited to being productized and distributed as a whole, and each device when a single device or a plurality of devices are integrated can be commercialized and distributed. . Part or all of a program executed by a computer included in the control device 108 can be distributed via a computer-readable recording medium or a communication line.

100, 100A Power generation system 101 First power converter 102 Second power converter 103 Third power converter 104, 104_1, 104_2, 104_3 PV panel 105 Storage battery 106 Energy converter 107 Breaker 107_1, 107_2, 107_3 Changeover switch 108, 108A Control device 200 Commercial system

Claims (6)

Solar panels,
An energy conversion device that converts electrical energy into predetermined energy;
A storage battery that is charged by the power generated by the solar panel;
A first power converter that reversely flows power generated by the solar panel to a power system;
A second power converter that controls charging and discharging of the storage battery;
A power generation system comprising: a third power conversion device that converts generated power of the solar panel or discharge power of the storage battery into predetermined power and supplies the converted power to the energy conversion device. While controlling the electric power which the said 1st power converter device carries out the reverse power flow to the said electric power grid becomes below the output limit value with respect to the said electric power grid,
The power generation system according to claim 1, wherein the second power conversion device controls charging / discharging of the storage battery so that the power supplied to the energy conversion device by the third power conversion device is stabilized. The power generation system according to claim 1, further comprising a circuit breaker that connects or disconnects the second power conversion device to or from an output of the solar panel. The power generation system according to any one of claims 1 to 3, wherein the first power conversion device and the second power conversion device have a function of performing maximum power tracking control of the solar panel. Solar panels,
An energy conversion device that converts electrical energy into predetermined energy;
With a storage battery that is charged by the power generated by the solar panel,
The power generated by the solar panel by the first power converter is caused to flow backward to the power system,
Control charging / discharging of the storage battery by the second power converter,
A power generation method for converting the generated power of the solar panel or the discharged power of the storage battery into predetermined power by a third power conversion device and supplying the converted power to the energy conversion device. Solar panels,
An energy conversion device that converts electrical energy into predetermined energy;
With a storage battery that is charged by the power generated by the solar panel,
The power generated by the solar panel by the first power converter is caused to flow backward to the power system,
Control charging / discharging of the storage battery by the second power converter,
The program which makes a computer perform the process which converts into a predetermined | prescribed electric power the generated electric power of the said solar panel or the discharge electric power of the said storage battery by a 3rd power converter, and supplies it to the said energy converter.

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