Photovoltaic module control system and photovoltaic system

Abstract

A photovoltaic module control system and a photovoltaic system. The photovoltaic module control system comprises a rapid shut-down system and at least one rapid shut-down device. The rapid shut-down system is electrically connected to an inverter and the rapid shut-down device, and is configured to send a first PLC signal to the rapid shut-down device and receive a second PLC signal from the rapid shut-down device. The rapid shut-down device is electrically connected to a corresponding photovoltaic module, and is configured to switch to a turn-on state on the basis of the first PLC signal, acquire module data, send the second PLC signal to the rapid shut-down system and, on the basis of an anomaly of the module data, switch to a turn-off state, the first PLC signal being configured to control the rapid shut-down device to be turned on, and the second PLC signal comprising the module data acquired by the rapid shut-down device.

Description

Photovoltaic module control system and photovoltaic system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410205947.X and application date of February 23, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by introduction. Technical Field

[0003] The present application relates to the technical field of photovoltaic (PV) systems, and in particular, to a photovoltaic module control system and a photovoltaic system. Background Art

[0004] A photovoltaic array includes multiple photovoltaic modules arranged in an array. In a photovoltaic system, the multiple photovoltaic modules are electrically connected to an inverter via a DC bus.

[0005] Abnormal voltage, current, or temperature conditions in PV panels can impact their safety and reliability. Using a Rapid Shutdown Device (RSD) can quickly disconnect the PV panels from the inverter, reducing the DC high voltage across the strings and improving the safety and reliability of the PV panels.

[0006] However, when an abnormal situation occurs in a photovoltaic module, it is difficult for the fast shutdown device to monitor the data and status of the photovoltaic module.

[0007] Application Contents

[0008] The present application provides a photovoltaic component control system and a photovoltaic system.

[0009] An embodiment of the present application provides a photovoltaic module control system, which is electrically connected to a photovoltaic module array and an inverter. The photovoltaic module array includes at least one photovoltaic module, and the photovoltaic module control system includes a rapid shutdown system and at least one rapid shutoff. The rapid shutdown system is electrically connected to the inverter and the rapid shutoff, and is configured to send a first PLC signal to the rapid shutoff and receive a second PLC signal from the rapid shutoff. The rapid shutoff is electrically connected to the corresponding photovoltaic module and is configured to switch to an on state according to the first PLC signal, collect module data, send a second PLC signal to the rapid shutdown system, and switch to an off state based on an abnormality in the module data. The first PLC signal is configured to control the conduction of the rapid shutoff, and the second PLC signal includes the module data collected by the rapid shutoff.

[0010] In some embodiments, the fast shutdown system includes an RSS mutual inductance device and an RSS transmitter; the RSS mutual inductance device is coupled to the DC bus and is configured to couple a first PLC signal from the RSS transmitter to the DC bus and receive a second PLC signal from the DC bus; the RSS transmitter is electrically connected to the RSS mutual inductance device and is configured to send a first PLC signal to the RSS mutual inductance device and receive a second PLC signal from the RSS mutual inductance device.

[0011] In some embodiments, the RSS mutual inductor includes a first PLC mutual inductor, a primary side of the first PLC mutual inductor is electrically connected to the fast shutdown device and the inverter, and a secondary side of the first PLC mutual inductor is electrically connected to the RSS transmitter.

[0012] In some embodiments, the RSS transmitter includes a first controller and a first modem circuit;

[0013] The first controller is electrically connected to the first modulation and demodulation circuit and is configured to send a first control signal to the first modulation and demodulation circuit and receive a data signal from the first modulation and demodulation circuit;

[0014] The first modulation and demodulation circuit is electrically connected to the RSS mutual sensing device, and is configured to modulate the first control signal into a first PLC signal, send the first PLC signal to the RSS mutual sensing device, and demodulate the second PLC signal from the RSS mutual sensing device 111 into a data signal, and send the data signal to the first controller;

[0015] The data signal is obtained by converting component data collected by the fast shutdown device into digital form.

[0016] In some embodiments, the rapid shutdown system further includes a communication component; the communication component communicates with the control terminal, and the communication component is configured to receive component data from the RSS transmitter, send the component data to the control terminal, and receive a shutdown signal from the control terminal, and send the shutdown signal to the RSS transmitter; the RSS transmitter is further configured to convert the shutdown signal into a third PLC signal, and send the third PLC signal to the RSS mutual inductance device; the RSS mutual inductance device is further configured to couple the third PLC signal to the DC bus; wherein, the shutdown signal is configured to control the rapid shutdown device to shut down.

[0017] In some embodiments, the rapid shutdown system also includes a storage component; the storage component is electrically connected to the RSS transmitter and the communication component, and is configured to receive and store component data from the RSS transmitter, and send all component data to the communication component based on the completion of polling of all component data of the photovoltaic component array.

[0018] In some embodiments, the fast shutoff device includes a sampling circuit, a switching circuit, a filtering circuit, a transceiver circuit, a second modulation and demodulation circuit and a second controller; the sampling circuit is electrically connected to the negative output terminal of the corresponding photovoltaic component and is configured to collect component data; the switching circuit is electrically connected to the sampling circuit, the filtering circuit and the second controller, and is configured to switch to an on state according to a first control signal from the second controller, and to switch to an off state according to a second control signal from the second controller; the filtering circuit is electrically connected to the positive output terminal of the corresponding photovoltaic component and the transceiver circuit, and is configured to filter out the low-frequency component of the PLC signal on the DC bus, thereby transmitting the first high-frequency signal and the second high-frequency signal; the transceiver circuit is coupled to the DC bus, and is configured to receive the first high-frequency signal from the DC bus and couple the second high-frequency signal to the DC bus; the second modulation and demodulation circuit The circuit is electrically connected to the transceiver circuit and the second controller, and is configured to demodulate the first high-frequency signal into a first control signal, send the first control signal to the second controller, and receive a data signal from the second controller, modulate the data signal into a second high-frequency signal, and send the second high-frequency signal to the transceiver circuit; the second controller is configured to send the first control signal to the switching circuit, obtain component data, generate a data signal based on the component data, send the data signal to the second modulation and demodulation circuit, and generate a second control signal based on an abnormality in the component data, and send the second control signal to the switching circuit; wherein the first high-frequency signal is the high-frequency component of the first PLC signal, the second high-frequency signal is the high-frequency component of the second PLC signal, the first control signal is configured to control the fast switch to be turned on, and the second control signal is configured to control the fast switch to be turned off.

[0019] In some embodiments, the rapid shutdown device also includes a protection circuit; the protection circuit is connected in parallel with the filter circuit and is configured to shut down based on the switching circuit to provide a protection path for power transmission, so that the connection between the photovoltaic component array and the inverter is not broken due to the shutdown of the rapid shutdown device.

[0020] In some embodiments, the transceiver circuit includes a second PLC transformer, the primary side of the second PLC transformer is electrically connected to the positive output end of the photovoltaic component and the filter circuit, and the secondary side of the second PLC transformer is electrically connected to the second modulation and demodulation circuit.

[0021] In some embodiments, the sampling circuit includes a resistor, the switching circuit includes a switching tube, the filtering circuit includes a coupling capacitor, and the protection circuit includes a bypass diode; one end of the resistor is electrically connected to the negative output end of the photovoltaic module, and the other end of the resistor is electrically connected to the drain of the switching tube; the gate of the switching tube is electrically connected to the second controller, and the source of the switching tube is electrically connected to the anode of the bypass diode and one end of the coupling capacitor; the cathode of the bypass diode is electrically connected to the positive output end of the photovoltaic module and the primary side of the second PLC transformer; the other end of the coupling capacitor is electrically connected to the positive output end of the photovoltaic module and the primary side of the second PLC transformer.

[0022] The present application also provides a photovoltaic system, which includes an inverter and the photovoltaic module control system provided in the above embodiment, and the photovoltaic module control system electrically connects the photovoltaic module array and the inverter.

[0023] Upon activation of the rapid shutdown system, a first PLC signal is generated, coupled to the DC bus, and transmitted to the rapid shutdown device via the DC bus. The rapid shutdown device switches to an on state based on the first PLC signal. Upon the rapid shutdown device turning on, the corresponding photovoltaic module is electrically connected to the inverter, transmitting power to the inverter. The rapid shutdown device collects module data, converts the module data into a second PLC signal, and couples the second PLC signal to the DC bus. The rapid shutdown system receives the second PLC signal from the DC bus and converts the second PLC signal into module data collected by the rapid shutdown device, thereby enabling real-time monitoring of the photovoltaic modules. Furthermore, if the module data collected by the rapid shutdown device exhibits an anomaly, the rapid shutdown device can rapidly disconnect the corresponding photovoltaic module from the inverter, reducing the DC high voltage of the photovoltaic module array, thereby improving the safety and reliability of the photovoltaic modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a photovoltaic module control system provided by an embodiment of the present application;

[0025] FIG2 is a circuit diagram of an RSS transmitter provided by an example;

[0026] FIG3 is a circuit diagram of a fast shutoff device provided by an example;

[0027] FIG4 is a circuit diagram of a photovoltaic module control system provided by an example;

[0028] FIG5 is a schematic structural diagram of a photovoltaic system provided by an example.

[0029] Description of main component symbols:

[0030] 10-PV panel control system, 20-PV panel array, 30-inverter, PV1~PVn-PV panels, RSD1~RSDn-rapid shutdown devices, 11-rapid shutdown system, 111-RSS mutual inductor, 112-RSS transmitter, 1121-first controller, 1122-first modulation and demodulation circuit, 121-sampling circuit, 122-switching circuit, 123-protection circuit, 124-filtering circuit, 125-transceiver circuit, 126-second modulation and demodulation circuit, 127-second controller, 1111-first PLC mutual inductor, LA-positive bus, LB-negative bus, R1~R2-resistors, Q1~Q2-switches, D1~D2-bypass diodes, C1~C2-coupling capacitors, 1251-second PLC mutual inductor, 40-PV system. Modes for Carrying Out the Invention

[0031] It should be noted that in the embodiments of the present application, "at least one" means one or more, and "a plurality of" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The terms "first", "second", etc. in the specification, claims, and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0032] FIG1 is a schematic structural diagram of a photovoltaic module control system provided by an embodiment of the present application.

[0033] As shown in Figure 1, a photovoltaic module control system 10 electrically connects a photovoltaic module array 20 and an inverter 30. The photovoltaic module array 20 includes a plurality of photovoltaic modules PV1 to PVn. The photovoltaic module control system 10 includes a rapid shutdown system (RSS) 11 and a plurality of rapid shutdown devices RSD1 to RSDn.

[0034] Multiple rapid shutdown devices RSD1-RSDn are electrically connected to corresponding photovoltaic modules PV1-PVn, respectively. Multiple rapid shutdown devices RSD1-RSDn are connected in series; the positive output of rapid shutdown device RSD1 is electrically connected to the negative output of rapid shutdown device RSD2, and the positive output of rapid shutdown device RSD2 is electrically connected to the negative output of rapid shutdown device RSD3. Similarly, the positive output of rapid shutdown device RSDn-1 is electrically connected to the negative output of rapid shutdown device RSDn. The positive output of rapid shutdown device RSDn is electrically connected to the positive input of inverter 30 via positive bus LA, and the negative output of rapid shutdown device RSD1 is electrically connected to the negative input of inverter 30 via negative bus LB.

[0035] The rapid shutdown system 11 includes an RSS mutual inductor 111 and an RSS transmitter 112 (RSS Transmitter). The RSS transmitter 112 is electrically connected to the RSS mutual inductor 111. The RSS transmitter 112 is configured to generate a first power line carrier (PLC) signal, send the first PLC signal to the RSS mutual inductor 111, and receive a second PLC signal from the RSS mutual inductor 111. The RSS mutual inductor 111 is coupled to a DC bus and is configured to couple the first PLC signal to the DC bus and transmit the first PLC signal to each rapid shutoff device via the DC bus, thereby controlling the conduction of each rapid shutoff device, and receive a second PLC signal from each rapid shutoff device from the DC bus, and then send the second PLC signal to the RSS transmitter 112. The RSS mutual inductor 111 may include a PLC mutual inductor.

[0036] It should be noted that the DC bus mentioned above is the negative bus LB; in some embodiments, the DC bus may also be the positive bus LA.

[0037] The first PLC signal is configured to control the conduction of each rapid shutdown device. The second PLC signal includes component data collected by each rapid shutdown device, which may include data such as the voltage and / or current of the photovoltaic module, the temperature and switch status of the rapid shutdown device, etc.

[0038] Upon activation of the rapid shutdown system 11, the RSS transmitter 112 generates a first PLC signal. The RSS mutual inductor 111 couples the first PLC signal to the negative bus LB and transmits the first PLC signal to each rapid shutoff device via the negative bus LB. Each rapid shutoff device switches to an on state based on the first PLC signal. Upon the rapid shutoff device being turned on, the corresponding photovoltaic module is electrically connected to the inverter 30, transmitting electrical energy to the inverter 30. The rapid shutoff device collects module data, converts the module data into a second PLC signal, and couples the second PLC signal to the positive bus LA. The RSS mutual inductor 111 receives the second PLC signal from the negative bus LB and transmits the second PLC signal to the RSS transmitter 112. The RSS transmitter 112 converts the second PLC signal into module data collected by the rapid shutoff device, thereby achieving real-time monitoring of the photovoltaic module. Furthermore, when the component data collected by the fast shutdown device is abnormal, the fast shutdown device can quickly cut off the connection between the corresponding photovoltaic component and the inverter 30 to reduce the DC high voltage of the photovoltaic component array 20, thereby improving the safety and reliability of the photovoltaic component.

[0039] In some embodiments, the rapid shutdown system 11 further includes a communication component (not shown), which communicates with the control terminal. The communication component is configured to receive component data from the RSS transmitter 112 and send the component data to the control terminal. The control terminal includes a processor and a display screen, the display screen is configured to display the component data collected by the rapid shutdown device, and the processor is configured to generate a shutdown signal based on an abnormality in the component data, and send the shutdown signal to the communication component. The shutdown signal is configured to control the rapid shutdown device to shut down. After receiving the shutdown signal, the communication component sends the shutdown signal to the RSS transmitter 112. The RSS transmitter 112 converts the shutdown signal into a third PLC signal and sends the third PLC signal to the RSS mutual inductance device 111. The RSS mutual inductance device 111 couples the third PLC signal to the negative bus LB, and transmits the third PLC signal to the rapid shutdown device through the negative bus LB. The fast disconnector switches to the off state according to the third PLC signal, thereby cutting off the connection between the corresponding photovoltaic assembly and the inverter 30, thereby realizing remote monitoring of the photovoltaic assembly.

[0040] In some embodiments, the rapid shutdown system 11 further includes a storage component (not shown), which is electrically connected to the RSS transmitter 112 and configured to receive and store component data from the RSS transmitter 112 and, after completing polling of all component data of all photovoltaic components in the photovoltaic array 20, send all component data to the communication component. The communication component then sends all component data to the cloud or a control terminal.

[0041] It can be understood that the control terminal may include a smartphone equipped with a display screen, a tablet computer, a PDA, a laptop computer, a mobile Internet device (MID), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in a smart grid, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a terminal device in a 5G network or a terminal device in a public land mobile communication network (PLMN), etc.

[0042] FIG. 2 is a circuit diagram of an RSS transmitter provided by an example.

[0043] As shown in FIG. 2 , the RSS transmitter 112 includes a first controller 1121 and a first modulation and demodulation circuit 1122 .

[0044] The first controller 1121 is electrically connected to the first modulation and demodulation circuit 1122 , and is configured to send a first control signal to the first modulation and demodulation circuit 1122 and receive a data signal from the first modulation and demodulation circuit 1122 .

[0045] The first modulation and demodulation circuit 1122 is electrically connected to the RSS mutual inductance device 111, and is configured to modulate the first control signal into a first high-frequency signal, send the first high-frequency signal to the RSS mutual inductance device 111, and demodulate the second high-frequency signal from the RSS mutual inductance device 111 into a data signal, and send the data signal to the first controller 1121.

[0046] The first control signal is configured to control the conduction of the rapid shut-off device. The data signal is obtained by analog-to-digital conversion of component data collected by the rapid shut-off device, and the data signal can be transmitted using the MODBUS RTU protocol. The first high-frequency signal is the high-frequency component of the first PLC signal. The second high-frequency signal is the high-frequency component of the second PLC signal. The first high-frequency signal and the second high-frequency signal can be modulated using amplitude shift keying (ASK). Exemplarily, the frequency of the first high-frequency signal and the second high-frequency signal can be 384 kHz.

[0047] Upon activation of the rapid shutdown system 11, the first controller 1121 generates a first control signal. The first modulation and demodulation circuit 1122 modulates the first control signal into a first high-frequency signal and transmits the first high-frequency signal to the RSS mutual inductor 111. The RSS mutual inductor 111 couples the first high-frequency signal to the negative bus LB and transmits the first high-frequency signal to the rapid shutdown device via the negative bus LB. The rapid shutdown device switches to an on state in response to the first high-frequency signal. Leveraging the high transmission speed and long transmission distance of high-frequency signals, the rapid shutdown device can respond more quickly to the first control signal. Upon the rapid shutdown device turning on, the corresponding photovoltaic module is electrically connected to the inverter 30, transmitting power to the inverter 30. The rapid shutdown device collects module data, converts the module data into a second high-frequency signal, and couples the second high-frequency signal to the positive bus LA. The RSS mutual inductor 111 receives the second high-frequency signal from the negative bus LB and transmits the second high-frequency signal to the first modulation and demodulation circuit 1122.

[0048] The first modulation and demodulation circuit 1122 demodulates the second high-frequency signal into a data signal and sends the data signal to the first controller 1121 .

[0049] The first controller 1121 receives the data signal, thereby achieving real-time monitoring of the photovoltaic components.

[0050] FIG3 is a circuit diagram of a fast shutdown device provided by an example.

[0051] As shown in FIG3 , the fast shutdown device includes a sampling circuit 121 , a switch circuit 122 , a protection circuit 123 , a filter circuit 124 , a transceiver circuit 125 , a second modulation and demodulation circuit 126 and a second controller 127 .

[0052] The sampling circuit 121 is electrically connected to the negative output terminal of the photovoltaic module and is configured to collect module data of the photovoltaic module. The sampling circuit 121 may include a resistor.

[0053] The switch circuit 122 is electrically connected to the sampling circuit 121, the protection circuit 123, the filter circuit 124, and the second controller 127, and is configured to switch to an on state according to a first control signal from the second controller 127, and to switch to an off state according to a second control signal from the second controller 127. The switch circuit 122 may include a switch tube.

[0054] The filter circuit 124 is electrically connected to the positive output terminal of the photovoltaic module and the transceiver circuit 125 and is configured to filter out the low-frequency component of the PLC signal on the DC bus, thereby transmitting the first high-frequency signal and the second high-frequency signal. The filter circuit 124 may include a coupling capacitor.

[0055] The transceiver circuit 125 is configured to receive a first high-frequency signal from a DC bus and couple a second high-frequency signal to the DC bus, wherein the DC bus includes a positive bus LA and a negative bus LB. The transceiver circuit 125 may include a PLC mutual inductor.

[0056] The second modulation and demodulation circuit 126 is electrically connected to the transceiver circuit 125 and the second controller 127, and is configured to demodulate the first high-frequency signal into a first control signal, send the first control signal to the second controller 127, and receive a data signal from the second controller 127, modulate the data signal into a second high-frequency signal, and send the second high-frequency signal to the transceiver circuit 125.

[0057] The second controller 127 is configured to send a first control signal to the switch circuit 122, thereby controlling the switch circuit 122 to turn on, obtain component data, generate a data signal based on the component data, send the data signal to the second modulation and demodulation circuit 126, and generate a second control signal based on an abnormality in the component data, and send the second control signal to the switch circuit 122, thereby controlling the switch circuit 122 to turn off.

[0058] In some embodiments, the rapid shutdown device further includes a protection circuit 123. This protection circuit 123 is connected in parallel with the filter circuit 124 and is configured to shut down upon the switching circuit 122, providing a protection path for power transmission and preventing the connection between the photovoltaic array 20 and the inverter 30 from being disconnected due to the rapid shutdown device. The protection circuit 123 may include a bypass diode.

[0059] The transceiver circuit 125 receives a first high-frequency signal from the DC bus. The second modulation and demodulation circuit 126 demodulates the first high-frequency signal into a first control signal and sends the first control signal to the second controller 127. The second controller 127 sends the first control signal to the switch circuit 122, thereby controlling the switch circuit 122 to conduct, turning on the fast disconnector. Upon turning on the fast disconnector, the corresponding photovoltaic module is electrically connected to the inverter 30, transmitting power to the inverter 30. The sampling circuit 121 collects module data. The second controller 127 obtains the module data, generates a data signal based on the module data, and sends the data signal to the second modulation and demodulation circuit 126. The second modulation and demodulation circuit 126 modulates the data signal into a second high-frequency signal and sends the second high-frequency signal to the transceiver circuit 125. The transceiver circuit 125 couples the second high-frequency signal to the DC bus. The second controller 127 generates a second control signal based on the abnormality of the component data, and sends the second control signal to the switch circuit 122, thereby controlling the switch circuit 122 to shut down, causing the fast disconnector to shut down, thereby quickly cutting off the connection between the corresponding photovoltaic component and the inverter 30 to reduce the DC high voltage of the photovoltaic component array 20, thereby improving the safety and reliability of the photovoltaic component.

[0060] It is understood that in other embodiments, the protection circuit 123 may be deleted.

[0061] FIG4 is a circuit diagram of a photovoltaic module control system provided as an example.

[0062] Taking two photovoltaic modules PV1-PV2 as an example, as shown in FIG4 , the photovoltaic module control system 10 includes a rapid shutdown system 11 , a rapid shutdown device RSD1 and a rapid shutdown device RSD2 .

[0063] The rapid shutdown system 11 includes an RSS mutual sensing device 111 and an RSS transmitter 112 .

[0064] In some embodiments, the RSS mutual inductor 111 includes a first PLC mutual inductor 1111. The primary side of the first PLC mutual inductor 1111 is electrically connected to the negative output terminal of the rapid shutdown device RSD1 and the negative input terminal of the inverter 30, and the secondary side of the first PLC mutual inductor 1111 is electrically connected to the RSS transmitter 112. The first PLC mutual inductor 1111 is configured to receive a first high-frequency signal from the RSS transmitter 112, couple the first high-frequency signal to the negative bus LB, and receive a second high-frequency signal from the negative bus LB and transmit the second high-frequency signal to the RSS transmitter 112.

[0065] The RSS transmitter 112 includes a first controller 1121 and a first modulation and demodulation circuit 1122. The first controller 1121 is electrically connected to the first modulation and demodulation circuit 1122 and is configured to send a first control signal to the first modulation and demodulation circuit 1122 and receive a data signal from the first modulation and demodulation circuit 1122. The first modulation and demodulation circuit 1122 is configured to modulate the first control signal into a first high-frequency signal, send the first high-frequency signal to the first PLC transformer 1111, and demodulate the second high-frequency signal from the first PLC transformer 1111 into a data signal, and send the data signal to the first controller 1121.

[0066] Rapid shutoff devices RSD1 and RSD2 are electrically connected to photovoltaic modules PV1 and PV2, respectively. The positive output of rapid shutoff device RSD1 is electrically connected to the negative output of rapid shutoff device RSD2. The positive output of rapid shutoff device RSD2 is electrically connected to the positive input of inverter 30 via positive bus LA, while the negative output of rapid shutoff device RSD1 is electrically connected to the negative input of inverter 30 via negative bus LB.

[0067] The circuit structures of the fast shutdown device RSD1 and the fast shutdown device RSD2 are the same.

[0068] In some embodiments, the transceiver circuit 125 includes a second PLC transformer 1251 , the primary side of the second PLC transformer 1251 is electrically connected to the positive output end of the photovoltaic module and the filter circuit 124 , and the secondary side of the second PLC transformer 1251 is electrically connected to the second modulation and demodulation circuit 126 .

[0069] In some embodiments, the sampling circuit 121 includes a resistor R1 , the switch circuit 122 includes a switch tube Q1 , the filter circuit 124 includes a coupling capacitor C1 , and the protection circuit 123 includes a bypass diode D1 .

[0070] Exemplarily, the fast shutdown device RSD1 includes a resistor R1 , a switch tube Q1 , a bypass diode D1 , a coupling capacitor C1 , a second PLC mutual inductor 1251 , a second modulation and demodulation circuit 126 , and a second controller 127 .

[0071] One end of the resistor R1 is electrically connected to the negative output terminal of the photovoltaic module PV1, and the other end of the resistor R1 is electrically connected to the drain of the switch tube Q1. The resistor R1 is configured to collect module data of the photovoltaic module PV1.

[0072] The gate of the switch Q1 is electrically connected to the second controller 127, and the source of the switch Q1 is electrically connected to the anode of the bypass diode D1, one end of the coupling capacitor C1, and the negative input terminal of the inverter 30. The switch Q1 is configured to be switched to an on state in response to a first control signal from the second controller 127, and to be switched to an off state in response to a second control signal from the second controller 127.

[0073] The cathode of bypass diode D1 is electrically connected to the positive output terminal of photovoltaic module PV1 and the primary side of second PLC transformer 1251. Bypass diode D1 is configured to provide a protection path for power transmission based on the shutdown of switch Q1, so that the connection between photovoltaic module array 20 and inverter 30 is not disconnected due to the shutdown of rapid shutdown device RSD1.

[0074] Coupling capacitor C1 is connected in parallel with bypass diode D1, and the other end of coupling capacitor C1 is electrically connected to the positive output terminal of photovoltaic module PV1 and the primary side of second PLC transformer 1251. Coupling capacitor C1 is configured to filter out low-frequency components of the PLC signal on the DC bus, thereby transmitting the first high-frequency signal and the second high-frequency signal.

[0075] The second PLC transformer 1251 is configured to receive a first high-frequency signal from the DC bus and couple a second high-frequency signal to the DC bus.

[0076] The second modulation and demodulation circuit 126 is electrically connected to the secondary side of the second PLC transformer 1251 and the second controller 127, and is configured to demodulate the first high-frequency signal into a first control signal, send the first control signal to the second controller 127, and receive a data signal from the second controller 127, modulate the data signal into a second high-frequency signal, and send the second high-frequency signal to the second PLC transformer 1251.

[0077] The second controller 127 is configured to send a first control signal to the switch tube Q1, thereby controlling the switch tube Q1 to turn on, obtain component data, generate a data signal based on the component data, send the data signal to the second modulation and demodulation circuit 126, and generate a second control signal based on an abnormality in the component data, and send the second control signal to the switch tube Q1, thereby controlling the switch tube Q1 to turn off.

[0078] In this embodiment, upon activation of the rapid shutdown system 11, the first controller 1121 generates a first control signal. The first modulation and demodulation circuit 1122 modulates the first control signal into a first high-frequency signal and transmits the first high-frequency signal to the first PLC transformer 1111. The first PLC transformer 1111 couples the first high-frequency signal to the negative bus LB. The first high-frequency signal is transmitted via coupling capacitor C1. The second PLC transformer 1251 receives the first high-frequency signal from the positive bus LA and couples the first high-frequency signal to the second modulation and demodulation circuit 126. The second modulation and demodulation circuit 126 demodulates the first high-frequency signal into a first control signal and transmits the first control signal to the second controller 127. The second controller 127 transmits the first control signal to the switch Q1, thereby turning on the switch Q1 and the rapid shutdown device RSD1.

[0079] When rapid shutdown resistor RSD1 is turned on, photovoltaic panel PV1 is electrically connected to inverter 30 and transmits power to inverter 30. Resistor R1 collects component data from photovoltaic panel PV1. Second controller 127 obtains the component data, generates a data signal based on the component data, and transmits the data signal to second modulation and demodulation circuit 126. Second modulation and demodulation circuit 126 modulates the data signal into a second high-frequency signal and transmits the second high-frequency signal to second PLC transformer 1251. Second PLC transformer 1251 couples the second high-frequency signal to positive bus LA. The second high-frequency signal is transmitted through inverter 30. First PLC transformer 1111 receives the second high-frequency signal from negative bus LB and couples the second high-frequency signal to first modulation and demodulation circuit 1122. First modulation and demodulation circuit 1122 demodulates the second high-frequency signal into a data signal and transmits the data signal to first controller 1121. First controller 1121 receives the data signal, thereby enabling real-time monitoring of photovoltaic panel PV1.

[0080] The second controller 127 generates a second control signal based on the abnormality of the component data and sends the second control signal to the switch tube Q1, thereby controlling the switch tube Q1 to turn off and turning off the fast disconnector RSD1, thereby quickly cutting off the connection between the photovoltaic component PV1 and the inverter 30 to reduce the DC high voltage of the photovoltaic component array 20, thereby improving the safety and reliability of the photovoltaic component PV1.

[0081] It is understood that the structures illustrated in the embodiments of the present application do not constitute a specific limitation on the photovoltaic module control system. In other embodiments, the photovoltaic module control system may include more or fewer components than shown, or may combine or separate certain components, or arrange the components differently.

[0082] The embodiment of the present application further provides a photovoltaic system 40 . Referring to FIG. 5 , the photovoltaic system 40 includes an inverter 30 and a photovoltaic module control system 10 . The photovoltaic module control system 10 is electrically connected to the photovoltaic module array 20 and the inverter 30 .

[0083] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A photovoltaic module control system (10), electrically connected to a photovoltaic module array (20) and an inverter (30), wherein the photovoltaic module array (20) includes at least one photovoltaic module (PV1-PVn), characterized in that: It includes a rapid shutdown system (11) and at least one rapid shutdown device (RSD1-RSDn); The fast shutdown system (11) is electrically connected to the inverter (30) and the fast shutdown device, and is configured to send a first PLC signal to the fast shutdown device and receive a second PLC signal from the fast shutdown device; The fast shutoff device is electrically connected to the corresponding photovoltaic module and is configured to switch to the on state according to the first PLC signal, collect module data, send the second PLC signal to the fast shutoff system (11), and switch to the off state based on an abnormality in the module data; The first PLC signal is configured to control the fast switch to be turned on, and the second PLC signal includes the component data collected by the fast switch.

2. The photovoltaic module control system (10) according to claim 1, characterized in that: The rapid shutdown system (11) includes an RSS mutual inductor (111) and an RSS transmitter (112); The RSS mutual induction device (111) is coupled to a DC bus and is configured to couple the first PLC signal from the RSS transmitter (112) to the DC bus and receive the second PLC signal from the DC bus; The RSS transmitter (112) is electrically connected to the RSS mutual induction device (111), and is configured to send the first PLC signal to the RSS mutual induction device (111), and receive the second PLC signal from the RSS mutual induction device (111).

3. The photovoltaic module control system (10) according to claim 2, characterized in that: The RSS mutual inductance device (111) comprises a first PLC mutual inductor (1111), a primary side of the first PLC mutual inductor (1111) being electrically connected to the fast switch and the inverter (30), and a secondary side of the first PLC mutual inductor (1111) being electrically connected to the RSS transmitter (112).

4. The photovoltaic module control system (10) according to claim 2, characterized in that: The RSS transmitter (112) includes a first controller (1121) and a first modulation and demodulation circuit (1122); The first controller (1121) is electrically connected to the first modulation and demodulation circuit (1122), and is configured to send a first control signal to the first modulation and demodulation circuit (1122), and receive a data signal from the first modulation and demodulation circuit (1122); The first modulation and demodulation circuit (1122) is electrically connected to the RSS mutual induction device (111), and is configured to modulate the first control signal into the first PLC signal, send the first PLC signal to the RSS mutual induction device (111), and demodulate the second PLC signal from the RSS mutual induction device (111) into the data signal, and send the data signal to the first controller (1121); The data signal is obtained by analog-to-digital conversion of the component data collected by the fast shutdown device.

5. The photovoltaic module control system (10) according to any one of claims 2 to 4, characterized in that: The rapid shutdown system (11) further includes a communication component; The communication component communicates with the control terminal, and the communication component is configured to receive the component data from the RSS transmitter (112), send the component data to the control terminal, and receive a shutdown signal from the control terminal, and send the shutdown signal to the RSS transmitter (112); The RSS transmitter (112) is further configured to convert the shutdown signal into a third PLC signal, and send the third PLC signal to the RSS mutual sensing device (111); The RSS mutual inductance device (111) is further configured to couple the third PLC signal to the DC bus; The shutdown signal is configured to control the fast shutdown device to shut down.

6. The photovoltaic module control system (10) according to claim 5, characterized in that: The rapid shutdown system (11) further includes a storage component; The storage component is electrically connected to the RSS transmitter (112) and the communication component, and is configured to receive and store the component data from the RSS transmitter (112), and send the entire component data to the communication component based on the completion of polling of the entire component data of the photovoltaic component array (20).

7. The photovoltaic module control system (10) according to claim 1, characterized in that: The fast shutoff device includes a sampling circuit (121), a switch circuit (122), a filter circuit (124), a transceiver circuit (125), a second modulation and demodulation circuit (126), and a second controller (127); The sampling circuit (121) is electrically connected to the negative output terminal of the corresponding photovoltaic component and is configured to collect component data; The switch circuit (122) is electrically connected to the sampling circuit (121), the filter circuit (124) and the second controller (127), and is configured to switch to an on state according to a first control signal from the second controller (127), and to switch to an off state according to a second control signal from the second controller (127); The filter circuit (124) is electrically connected to the positive output terminal of the corresponding photovoltaic module and the transceiver circuit (125), and is configured to filter out the low-frequency component of the PLC signal on the DC bus, thereby transmitting the first high-frequency signal and the second high-frequency signal; The transceiver circuit (125) is coupled to the DC bus and is configured to receive the first high-frequency signal from the DC bus and couple the second high-frequency signal to the DC bus; The second modulation and demodulation circuit (126) is electrically connected to the transceiver circuit (125) and the second controller (127), and is configured to demodulate the first high-frequency signal into a first control signal, send the first control signal to the second controller (127), and receive a data signal from the second controller (127), modulate the data signal into the second high-frequency signal, and send the second high-frequency signal to the transceiver circuit (125); The second controller (127) is configured to send the first control signal to the switch circuit (122), obtain the component data, generate the data signal according to the component data, send the data signal to the second modulation and demodulation circuit (126), and generate the second control signal based on an abnormality in the component data, and send the second control signal to the switch circuit (122); The first high-frequency signal is the high-frequency component of the first PLC signal, the second high-frequency signal is the high-frequency component of the second PLC signal, the first control signal is configured to control the fast switch to be turned on, and the second control signal is configured to control the fast switch to be turned off.

8. The photovoltaic module control system (10) according to claim 7, characterized in that: The fast shutoff device further includes a protection circuit (123); The protection circuit (123) is connected in parallel with the filter circuit (124) and is configured to provide a protection path for power transmission based on the shutdown of the switch circuit (122), so that the connection between the photovoltaic component array (20) and the inverter (30) is not disconnected due to the shutdown of the fast disconnector.

9. The photovoltaic module control system (10) according to claim 8, characterized in that: The transceiver circuit (125) comprises a second PLC mutual inductor (1251), the primary side of the second PLC mutual inductor (1251) being electrically connected to the positive output end of the photovoltaic component and the filter circuit (124), and the secondary side of the second PLC mutual inductor (1251) being electrically connected to the second modulation and demodulation circuit (126).

10. The photovoltaic module control system (10) according to claim 9, characterized in that: The sampling circuit (121) includes a resistor (R1), the switching circuit (122) includes a switching tube (Q1), the filtering circuit (124) includes a coupling capacitor (C1), and the protection circuit (123) includes a bypass diode (D1); One end of the resistor (R1) is electrically connected to the negative output end of the photovoltaic module, and the other end of the resistor (R1) is electrically connected to the drain of the switch tube (Q1); The gate of the switch tube (Q1) is electrically connected to the second controller (127), and the source of the switch tube (Q1) is electrically connected to the anode of the bypass diode (D1) and one end of the coupling capacitor (C1); The cathode of the bypass diode (D1) is electrically connected to the positive output terminal of the photovoltaic assembly and the primary side of the second PLC mutual inductor (1251); The other end of the coupling capacitor (C1) is electrically connected to the positive output end of the photovoltaic assembly and the primary side of the second PLC mutual inductor (1251).

11. A photovoltaic system (40), characterized in that The photovoltaic system (40) comprises an inverter (30) and a photovoltaic component control system (10) according to any one of claims 1 to 10, wherein the photovoltaic component control system (10) is electrically connected to a photovoltaic component array (20) and the inverter (30).

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