TWI737547B - Solar DC feeder disaster prevention system - Google Patents

Abstract

A solar DC feeder disaster prevention system is suitable for at least one solar panel module for generating at least one converted electric energy signal and at least one DC converter for detecting the at least one converted electric energy signal and sending a corresponding AC current value, The system includes at least one circuit protection unit and a data processing unit. The at least one circuit protection unit includes an electronically controlled switch module, a current detection module for detecting the at least one converted electrical energy signal, and a current detecting module for controlling the The electronic control switch module transmits the DC current value measured by the current detection module to the control module. The data processing unit is used to compare the DC current value with the AC current value. When the AC current value is When zero and the DC current value is not zero, the data processing unit drives the electronic control switch module to switch to an open circuit state to protect the safety of the system.

Description

Solar DC feeder disaster prevention system

The invention relates to a disaster prevention system, in particular to a solar direct current feeder disaster prevention system.

Referring to Figure 1, an existing solar power distribution system includes a plurality of solar panel modules 11 respectively outputting a plurality of converted electric energy signals, a power conversion module 12 electrically connected to the solar panel modules 11, and a power conversion module electrically connected to the power conversion module. The AC power distribution module 13 of the group 12, a plurality of first trunking members 14 that cover the lines between the solar panel modules 11 and the power conversion module 12, and a first wire trough member 14 that covers the power conversion module 12 and the AC power The second trunking member 15 of the circuit between the power distribution modules 13.

The solar panel modules 11 respectively convert solar energy into the converted electrical energy signals, and transmit the converted electrical energy signals in the form of direct current to the power conversion module 12, and then the converted electrical energy through the power conversion module 12 The signal is converted into an alternating current type, and finally the converted electric energy signals of the alternating current type are transmitted to the alternating current power distribution module 13 for subsequent integration into the AC power grid.

In the existing solar power distribution system, the AC wiring at the back end of the power conversion module 12 has proper power system protection, but there is no similar DC feeder between the solar panel modules 11 and the power conversion module 12 In the disaster prevention system, if the power is abnormal, but the system cannot be shut down in time, it may further damage the system. Therefore, the existing solar power distribution system urgently needs to be improved on the disaster prevention system.

Therefore, the purpose of the present invention is to provide a solar DC feeder disaster prevention system.

Therefore, the solar DC feeder disaster prevention system of the present invention is suitable for at least one solar panel module capable of converting solar energy into at least a DC-type conversion electric energy signal, and at least one solar panel module capable of converting the at least one converted electric energy signal into an alternating current form. AC converter, the at least one solar panel module has a first pole capable of outputting a first unipolar signal, and a second pole capable of outputting a second unipolar signal, the at least one first unipolar The signal and the at least one second unipolar signal together form the at least one converted electric energy signal. The at least DC converter has a third pole and a fourth pole electrically connected to the second pole. The at least DC converter can The magnitude of the current of the at least one converted electrical energy signal that has been converted into an alternating current form is detected, and a corresponding alternating current value is sent.

The solar DC feeder disaster prevention system includes at least one circuit protection unit and a data processing unit. The at least one circuit protection unit includes an input module electrically connected to the at least one solar panel module, an output module electrically connected to the at least DC converter, and a serial connection between the input module and the output module Current detection module, an electric control switch module connected in series with the current detection module between the input module and the output module, a power supply module electrically connected to the input module, and an electrical connection to the The electric control switch module, the current detection module and the control module of the power supply module. The input module has a first input terminal electrically connected to the first pole of the at least one solar panel module, and a second input terminal electrically connected to the second pole of the at least one solar panel module, the first An input terminal and the second input terminal jointly receive the at least one converted power signal. The output module has an output terminal electrically connected to the third pole of the at least DC converter, and the first unipolar signal transferred from the output terminal to the third pole is connected to the at least one solar The second unipolar signal output from the second pole of the board module to the fourth pole is combined together to form the at least one converted power signal for transmission to the at least DC converter. The current detection module is connected in series between the first input terminal and the output terminal, and is used for detecting the current magnitude of the first unipolar signal and sending a DC current value corresponding to the current magnitude of the first unipolar signal. The electronically controlled switch module and the current detection module are connected in series between the first input terminal and the output terminal, and are controlled to switch between an on state and an off state. In the on state, the first input The terminal and the output terminal are connected to each other, and in the open state, the first input terminal and the output terminal cannot be connected. The control module is used to control the electronic control switch module to switch between the on state and the off state, and can receive and transmit the DC current value detected by the current detection module.

The data processing unit is signally connected to the control module and the at least DC converter in the at least one circuit protection unit, and the data processing unit is connected to the DC current value sent by the control module and the at least DC converter. The detected AC current value is compared. When the data processing unit determines that the received AC current value is zero and the DC current value is not zero, it sends an interrupt signal to the control module, and the control module When the group receives the interrupt signal, it drives the electronic control switch module to switch to the disconnection state.

The effect of the present invention is that by the at least one circuit protection unit and the data processing unit connected to the at least one circuit protection unit by a signal, the DC current value transmitted by the control module and the at least DC AC converter can be compared The detected AC current value, and when the AC current value is zero and the DC current value is not zero, the interrupt signal is sent to drive the control module to switch the electronic control switch module to the open state, In order to play a disaster prevention effect and protect the safety of the overall system.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

Referring to FIG. 2, a first embodiment of the solar DC feeder disaster prevention system of the present invention is applicable to a solar panel module 91 for converting solar energy into a DC power signal, and a solar panel module 91 for converting the converted power signal It is a direct-to-ac converter 92 in the form of alternating current. The solar panel module 91 includes a first pole 911 for outputting a first unipolar signal, and a second pole 912 for outputting a second unipolar signal, The first unipolar signal and the second unipolar signal together form the converted electric energy signal. The direct-to-ac converter 92 includes a third pole 921 and a fourth pole 922 electrically connected to the second pole 912. The direct The AC converter 92 can detect the magnitude of the current of the converted electrical energy signal that has been converted into an AC form, and send a corresponding AC current value. In this embodiment, the DC/AC converter 92 is a photovoltaic inverter (Photovoltaics Inverter), and has a Maximum Power Point Tracking (MPPT) module (not shown), and the maximum power point tracking The module is used to adjust so that the direct-to-ac An AC current value of the converted electrical energy signal, a DC voltage value of the converted electrical energy signal received by the maximum power point tracking module before being converted into AC, and the corresponding direct AC measured by the maximum power point tracking module An input impedance value of the input impedance electrically connected to the converter 92. After the DC-AC converter 92 measures the AC current value and the DC voltage value, it sends the AC current value and the DC voltage value for subsequent analysis, and When the input impedance value is lower than a preset impedance value, a corresponding fault signal is sent. The AC current value corresponds to the current of the converted electrical energy signal that has been converted into AC power, and the DC voltage value corresponds to the solar panel The magnitude of the voltage of the converted electric energy signal received by the module 91.

The first embodiment includes a circuit protection unit 2, a data processing unit 3 with a signal connected to the circuit protection unit 2 and the DC-AC converter 92, a temperature measuring unit 4 with a signal connected to the data processing unit 3, and A signal is connected to the external emergency switch unit 5 of the data processing unit 3. In this embodiment, the data processing unit 3 is a microprocessor, and can send and receive signals through a built-in wireless communication chip module (not shown) or a built-in wired network module (not shown) The temperature measurement unit 4 is a digital thermometer, and transmits a corresponding ambient temperature value through a built-in wireless communication chip module (not shown). However, in other embodiments, the temperature measuring unit 4 may also be a plurality of digital thermometers, which are respectively arranged beside the circuit protection unit 2, the solar panel module 91 and the DC/AC converter 92 to detect various locations. The ambient temperature, but the temperature measurement unit 4 is not limited to the description here.

The circuit protection unit 2 includes an input module 21 electrically connected to the solar panel module 91, an output module 22 electrically connected to the DC-AC converter 92, and a series connection between the input module 21 and the output module 22 The current detection module 23, an electrically controlled switch module 24 connected in series with the current detection module 23 between the input module 21 and the output module 22, and a power supply module electrically connected to the input module 21 Group 25, and a control module 26 electrically connected to the current detection module 23, the electric control switch module 24, and the power supply module 25.

The input module 21 has a first input terminal 211 electrically connected to the first pole 911 of the solar panel module 91, and a second input terminal 212 electrically connected to the second pole 912 of the solar panel module 91 , The circuit protection unit 2 receives the first unipolar signal through the first input terminal 211, and receives the second unipolar signal through the second input terminal 212, so that the circuit protection unit 2 uses the input The module 21 receives the converted power signal.

The output module 22 has an output terminal 221 electrically connected to the third pole 921 of the DC-AC converter 92, and the output terminal 221 transfers the first unipolar signal to the first pole of the DC-AC converter 92 Three poles 921 are matched with the second pole 912 of the solar panel module 91 to output the second unipolar signal to the fourth pole 922 of the DC-AC converter 92. In this way, the DC-AC converter 92 can use The third pole 921 and the fourth pole 922 jointly receive the converted electrical energy signal. It should be noted that the converted electrical energy signal does not substantially change its current, voltage and other related characteristics after passing through the circuit protection unit 2. That is, the converted electric energy signal remains consistent before and after passing through the circuit protection unit 2.

The current detection module 23 is connected in series between the first input terminal 211 and the output terminal 221 and is used to detect the current magnitude of the first unipolar signal, and send a direct current corresponding to the current magnitude of the first unipolar signal value.

The electronically controlled switch module 24 and the current detection module 23 are connected in series between the first input terminal 211 and the output terminal 221, and are controlled to switch between an on state and an off state. In the on state, The first input terminal 211 and the output terminal 221 are connected to each other. In the open state, the first input terminal 211 and the output terminal 221 cannot be connected, which interrupts the connection between the solar panel module 91 and the DC-AC converter 92 Connect the loop. In addition, in this embodiment, the electronically controlled switch module 24 is an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), but in other variations, the electronically controlled switch module 24 may also be a metal oxide Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), Silicon Controlled Rectifier (SCR), or other electronically controlled switching elements that also have switching functions.

The power supply module 25 is electrically connected to the first input terminal 211 and the second input terminal 212. The power supply module 25 receives the converted electric energy composed of the first unipolar signal and the second unipolar signal. Signal to obtain electricity.

The control module 26 is electrically connected to the current detection module 23, the electronic control switch module 24 and the power supply module 25. The control module 26 receives the power supplied by the power supply module 25 to control the The electronically controlled switch module 24 switches between the on state and the off state, and can receive and transmit the DC current value detected by the current detection module 23.

The data processing unit 3 is signally connected to the control module 26 and the DC/AC converter 92, and the data processing unit 3 is connected to the DC current value sent by the control module 26 and the value detected by the DC/AC converter 92 The AC current value is compared, and when the data processing unit 3 determines that the AC current value is zero and the DC current value is not zero, it sends an interrupt signal to the control module 26, and the control module 26 receives When the interrupt signal is reached, the electronically controlled switch module 24 is driven to switch to the open state. As a result, when the DC-AC converter 92 fails to output AC power normally due to shutdown, and the solar panel module 91 continues to supply DC power At this time, the solar DC feeder disaster prevention system of the present invention can avoid accidents such as short circuits and fire escapes that are easily caused by the above-mentioned situations.

It is worth mentioning that the data processing unit 3 can determine whether a fire alarm has occurred in the scene through the ambient temperature value sent by the temperature measurement unit 4, and the temperature measurement unit 4 is connected to the data processing unit 3 by a signal and measured regularly. The on-site ambient temperature is to send the corresponding ambient temperature value, and the data processing unit 3 determines whether the ambient temperature value is higher than a preset temperature value at regular intervals, and continuously higher than the preset temperature value for the number of times When a predetermined number of times is reached, the interrupt signal is sent to the control module 26. In this embodiment, the preset temperature is 80 degrees Celsius, and the data processing unit 3 receives the interrupt signal every 20 seconds (the fixed time). The ambient temperature, when the data processing unit 3 receives the ambient temperature value higher than 80°C for three consecutive times (the predetermined number of times), it immediately sends the interrupt signal to the control module 26 to drive the electronic control switch module 24 to switch To this open circuit state, the risk of electric shock or secondary injury caused by fire and conduction of the circuit by firefighters or on-site maintenance personnel should be reduced. It should be noted that the fixed time mentioned here, the preset temperature value and the The values of the preset times are all examples and should not be limited by this.

In addition, an external person can remotely turn off the electronic control switch module 24 through the external emergency switch unit 5. Once faced with a situation that needs to turn off the circuit protection unit 2 as soon as possible (such as the above-mentioned fire), they can operate the external The emergency switch unit 5 sends an emergency shutdown signal to the data processing unit 4, and the data processing unit 4 transmits the emergency shutdown signal to the control module 26. When the control module 26 receives the emergency shutdown signal, it controls The electronically controlled switch module 24 is switched to the disconnected state, so that the first input terminal 211 and the output terminal 211 cannot be conducted, thereby interrupting the connection circuit between the solar panel module 91 and the DC-AC converter 92, In order to achieve the purpose of remotely powering off in an emergency, reduce the risk of firefighters or on-site maintenance personnel getting electric shock or causing secondary injury due to fire burns and conduction circuits.

In addition, the data processing unit 3 can also compare the DC voltage value detected by the DC-AC converter 92 with a preset voltage value corresponding to the solar panel module 91, when the DC voltage value is lower than At the preset voltage value, a warning message corresponding to the solar panel module 91 is generated. In this embodiment, the preset voltage of the solar panel module 91 is 660VDC, and the solar panel module 91 consists of 22 solar panels. (Not shown) are connected in series, so when the DC voltage value is lower than the preset voltage value, the data processing unit 3 can calculate each value according to the difference between the DC voltage value and the preset voltage value. The total number of solar panels (not shown) in a solar panel module 91 that are judged to be abnormal. For example, if the DC voltage value only outputs 600VDC, it can be inferred that two solar panels in the solar panel module 91 ( The power supply fails to operate normally, and this information is integrated into the warning information so that on-site maintenance personnel can compare and replace the solar panels (not shown) in the solar panel module 91 according to the warning information.

Referring to FIG. 3, a second embodiment of the solar DC feeder disaster prevention system of the present invention is applicable to five solar panel modules 91 and three direct AC converters 92. It is worth mentioning that each direct current AC converter 92 may also have multiple There are two maximum power point tracking modules (not shown in the figure). For example, in this embodiment, the DC-AC converter 92 at the top of FIG. 3 has three maximum power point tracking modules. The point tracking module can receive the DC voltage value and the input impedance value of the solar panel module 91 corresponding to each, and the corresponding DC-AC converter 92 can send the DC voltage value and the AC current value, and correspondingly When the input impedance value is lower than the preset impedance value, the corresponding fault signal is sent and shut down and restarted. The structures and functions of the solar panel modules 91 are the same as those of the first embodiment, so they will not be described again.

The second embodiment includes five circuit protection units 2, a data processing unit 3 that signals the circuit protection units 2 and the DC-AC converters 92, and a temperature measurement unit adjacent to the circuit protection units 2. Unit 4. In this embodiment, the direct-to-ac Then only one circuit protection unit 2 is matched, but the matching method should not be limited to this.

It is worth mentioning that the data processing unit 3 can be operated in a reset mode. In this embodiment, the data processing unit 3 switches to the reset mode regularly every day, but not limited to daily switching. In the reset mode, the data processing unit 3 sends the interrupt signal to the control module 26 in each circuit protection unit 2, and each control module 26 drives the electrically connected switch module 24 to switch To the disconnected state, and after a buffer time is over, send a pilot signal to the control modules 26 in sequence, and the control modules 26 that receive the pilot signal control the electronically controlled switch modules respectively 24 switches to this ON state. In this embodiment, the buffer time is one minute after the electronically controlled switch modules 24 are all switched to the disconnected state, but it should not be limited to this.

In addition, the data processing unit 3 can operate in a troubleshooting mode corresponding to the DC-AC converters 92. For simplicity, the DC-AC converter 92 at the top of FIG. 3 that also matches the circuit protection units 2 is taken as For example, when the data processing unit 3 receives the fault signal sent by the DC/AC converter 92, it enters the troubleshooting mode. In the troubleshooting mode, the data processing unit 3 drives the corresponding DC/AC converter 92 Each of the electronically controlled switch modules 24 is switched to the disconnected state, and after the corresponding DC-to-AC converter 92 is restarted, the pilot signal is sequentially sent to one of the electronically controlled switch modules 24 at a time. Each corresponding control module 26, that is, only conducts the circuit connected by one of the electronically controlled switch modules 24 at a time, and the control module 26 that receives the conduction signal controls the electronically controlled switch module 24 to switch to the After a detection time has elapsed, the electronically controlled switch module 24 is controlled to switch back to the off state. The data processing unit 3 can sequentially switch from the off state and the on state according to each electronically controlled switch module 24 , And then whether the fault signal is received during the process of switching back to the open circuit state, the detection information corresponding to the electronic control switch module 24 is generated, and the direct AC to which the electronic control switch module 24 is electrically connected is determined according to the detection information Whether the converter 92 sends the fault signal, the detection information respectively records whether the circuit corresponding to the circuit protection unit 2 causes the DC-AC converter 92 to generate the fault signal, and finally the DC-AC converter that has not sent the fault signal The electronically controlled switch module 24 electrically connected to 92 is switched to the conducting state, and the field maintenance personnel can check and repair the corresponding circuit based on the detection information. In this embodiment, the detection time is one minute after each electronically controlled switch module 24 is switched to the on state, until the DC-AC converter 92 sends the fault message, but it should not be limited to this.

In summary, the solar DC feeder disaster prevention system of the present invention achieves the ratio (1) by providing the at least one circuit protection unit 2, the data processing unit 3, the temperature measurement unit 4, and the external emergency switch unit 5 at the same time. Compare the DC current value transmitted by the control module 26 and the AC current value detected by the at least DC converter 92; (2) compare the DC current value detected by the at least DC converter 92 The voltage value corresponds to the preset voltage value of at least one solar panel module 91; and (3) each corresponding electronically controlled switch module 24 is switched to the open state and then sequentially switched back to the on state to detect The function of determining whether the circuit corresponding to the at least one circuit protection unit 2 is operating normally, etc., is matched with the temperature measurement unit 4 that can be used to measure and send the ambient temperature value, and the electronic control switch module 24 can be remotely and urgently turned off. The external emergency switch unit 5 can exert the disaster prevention effect and protect the safety of the overall system, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

2: Circuit protection unit 21: Input module 211 first input terminal 212: second input terminal 22: output module 221: output terminal 23: Detector module 24: Electric control switch module 25: Power supply module 26: control module 3: Data processing unit 4: Temperature measurement unit 5: External emergency switch unit 91: Solar Panel Module 911: the first pole 912: second pole 92: Direct AC converter 921: third pole 922: The Fourth Pole

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Fig. 1 is a schematic diagram of power distribution of an existing solar power distribution system; 2 is a schematic diagram of a power distribution of a first embodiment of the solar DC feeder disaster prevention system of the present invention; and Fig. 3 is a schematic diagram of power distribution of a second embodiment of the solar DC feeder disaster prevention system of the present invention.

2: Circuit protection unit

21: Input module

211: The first input terminal

212: second input terminal

22: output module

221: output terminal

23: Detector module

24: Electric control switch module

25: Power supply module

26: control module

3: Data processing unit

4: Temperature measurement unit

5: External emergency switch unit

91: Solar Panel Module

911: the first pole

912: second pole

92: Direct AC converter

921: third pole

922: The Fourth Pole

Claims (8)

A solar DC feeder disaster prevention system is suitable for at least one solar panel module capable of converting solar energy into at least a DC power conversion signal, and at least one DC converter capable of converting the at least one converted power signal into AC power , The at least one solar panel module has a first pole that can be used to output a first unipolar signal, and a second pole that can be used to output a second unipolar signal, the at least one first unipolar signal and the At least one second unipolar signal collectively constitutes the at least one converted electric energy signal, the at least DC converter has a third pole, and a fourth pole electrically connected to the second pole, the at least DC converter can detect that it has been converted The current magnitude of the at least one converted electric energy signal in the form of alternating current and sending a corresponding alternating current value. The solar direct current feeder disaster prevention system includes: At least one circuit protection unit, including: An input module having a first input terminal electrically connected to the first pole of the at least one solar panel module, and a second input terminal electrically connected to the second pole of the at least one solar panel module, the The first input terminal and the second input terminal jointly receive the at least one converted power signal; An output module having an output terminal electrically connected to the third pole of the at least DC converter, and the first unipolar signal transferred from the output terminal to the third pole is connected to the at least one solar The second unipolar signal output from the second pole of the board module to the fourth pole is combined together to form the at least one converted power signal for transmission to the at least DC converter; A current detection module, connected in series between the first input terminal and the output terminal, and used to detect the current magnitude of the first unipolar signal, and send a DC current value corresponding to the current magnitude of the first unipolar signal ； An electronically controlled switch module is connected in series with the current detection module between the first input terminal and the output terminal, and can be controlled to switch between an on state and an off state. In the on state, the first An input terminal and the output terminal are connected to each other, and in the open state, the first input terminal and the output terminal cannot be connected; A power supply module electrically connected to the first input terminal and the second input terminal, the power supply module receives the at least one converted electrical energy signal to obtain power; and A control module electrically connected to the current detection module, the electric control switch module and the power supply module, the control module controls the electric switch module by receiving the power supplied by the power supply module Switch between the on state and the off state, and can receive and transmit the DC current value detected by the current detection module; and A data processing unit, which signals the control module of the at least one circuit protection unit and the at least DC AC converter, and the data processing unit is connected to the DC current value sent by the control module and the at least DC AC converter. The detected AC current value is compared. When the data processing unit determines that the AC current value is zero, and the DC current value is not zero, it sends an interrupt signal to the control module, and the control module sends an interrupt signal to the control module. When the interrupt signal is received, the electronic control switch module is driven to switch to the disconnection state. According to the solar DC feeder disaster prevention system of claim 1, the at least DC converter can also be used to detect the voltage level of the at least one converted electric energy signal and send a corresponding DC voltage value, wherein the data processing unit also The DC voltage value detected by the at least DC converter can be compared with at least one preset voltage value corresponding to at least one solar panel module, when the DC voltage value is lower than the at least one preset voltage When the value is set, a pair of warning messages should be generated for at least one solar panel module. The solar DC feeder disaster prevention system according to claim 3, further comprising an external emergency switch unit connected to the data processing unit with a signal, the external emergency switch unit can be controlled to send an emergency shutdown signal to the data processing unit, the data The processing unit transmits the emergency shutdown signal to the control module, and when the control module receives the emergency shutdown signal, it controls the electronic control switch module to switch to the open state, so that the first input terminal and the output There is no continuity between the terminals. The solar DC feeder disaster prevention system according to claim 1, further comprising a temperature measurement unit connected to the data processing unit by a signal, and the temperature measurement unit is used to measure the temperature of the surrounding environment and send a corresponding environmental temperature Value to the data processing unit, the data processing unit determines whether the ambient temperature value is higher than a preset temperature value at regular intervals, and sends the value when the number of consecutive times higher than the preset temperature value reaches a predetermined number Interrupt the signal to the control module. The solar DC feeder disaster prevention system as described in claim 1 is suitable for multiple direct-to-ac The device is used to convert the converted electrical energy signals into alternating current forms. The solar DC feeder disaster prevention system includes a plurality of circuit protection units and the data processing unit. The data processing unit can be operated in a reset mode. In the reset mode, The data processing unit sends the interrupt signal to the control module in each circuit protection unit, and each control module drives the electrically connected switch module to the disconnection state, and waits for the end of a buffer time , Send a pilot signal to the control modules in sequence, and the control modules that receive the pilot signal respectively control the electronically controlled switch modules to switch to the on state. The solar DC feeder disaster prevention system as described in claim 1 is suitable for multiple direct-to-ac The converter is used to convert the converted electrical energy signals into alternating current forms. The direct-to-ac converters can also be used to detect their input impedance to obtain an input impedance value. When the input impedance value is lower than a preset impedance value Send a fault signal and shut down and restart, wherein the data processing unit can operate in a troubleshooting mode corresponding to the DC converters. When the data processing unit receives the fault signal sent by any AC converter, it enters the In the troubleshooting mode, in the troubleshooting mode, the data processing unit drives each electronic control switch module corresponding to the DC-AC converter to switch to the disconnected state, and after the corresponding DC-AC converter restarts, The pilot signal is sent to each corresponding control module in sequence in a way that only one of the electronically controlled switch modules is controlled at a time, and the control module that receives the pilot signal controls the electronically controlled switch module to switch to that After a detection time has elapsed, the electronic control switch module is controlled to switch back to the open state. The data processing unit can sequentially switch from the open state and the on state according to the corresponding electronic switch modules , And then whether to receive the fault signal in the process of switching back to the open circuit state, and generate a plurality of detection information corresponding to the electronic control switch modules. The solar DC feeder disaster prevention system according to claim 6, wherein, after the data processing unit generates the detection information in the troubleshooting mode, it can determine the electrical connection of each electronic control switch module according to the detection information Whether the DC-AC converter sends out the fault signal, and switches the electronically controlled switch module electrically connected to the DC-AC converter that has not sent the fault signal to the ON state. The solar DC feeder disaster prevention system according to claim 1, wherein the electronically controlled switch module can be selected from one of silicon controlled rectifiers, insulated gate bipolar transistors, and semiconductor field effect transistors.

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