WO2023134027A1 - 一种多输入关断器及控制方法、光伏发电系统 - Google Patents
一种多输入关断器及控制方法、光伏发电系统 Download PDFInfo
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- WO2023134027A1 WO2023134027A1 PCT/CN2022/084356 CN2022084356W WO2023134027A1 WO 2023134027 A1 WO2023134027 A1 WO 2023134027A1 CN 2022084356 W CN2022084356 W CN 2022084356W WO 2023134027 A1 WO2023134027 A1 WO 2023134027A1
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- switch
- photovoltaic unit
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- input terminal
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- 238000000034 method Methods 0.000 title claims description 15
- 238000010248 power generation Methods 0.000 title claims description 11
- 238000004891 communication Methods 0.000 claims abstract description 44
- 230000002159 abnormal effect Effects 0.000 claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims abstract description 18
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/002—Switching arrangements with several input- or output terminals
- H03K17/005—Switching arrangements with several input- or output terminals with several inputs only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Definitions
- the invention relates to the technical field of distributed photovoltaic power generation, in particular to a multi-input switch, a control method, and a photovoltaic power generation system.
- the mainstream disconnectors on the market are generally equipped with two input ports, which are connected to two photovoltaic modules, and the cost per watt is reduced by multiplexing the controller and structural components.
- the technical solution of the existing two-input switch is shown in Figure 1.
- the switch includes a communication module, a control module, bypass diodes D1-D3, and safety switches Q1 and Q2, wherein the bypass diode D1 is used in the first When the photovoltaic module is abnormal, the first photovoltaic module is bypassed, and the bypass diode D2 is used to bypass the second photovoltaic module when the second photovoltaic module is abnormal.
- the purpose of the present invention is to provide a multi-input switch and its control method.
- the bypass tube corresponding to the switch-off module inside the switch is omitted, and the power consumption is reduced. Shunt losses inside the interrupter.
- the present invention provides a multi-input switch, which includes:
- the first input end is used to couple the first photovoltaic unit, and the first photovoltaic unit includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring;
- At least one second input terminal for coupling a second photovoltaic unit, the second photovoltaic unit comprising at least one battery substring and a freewheeling diode connected in parallel with the battery substring;
- the first shut-off module coupled to the first input terminal, the first shut-off module at least includes a first switch tube and a first bypass tube, and the first switch tube is used to control the first photovoltaic unit and power On-off between buses, the first bypass tube is used to provide a freewheeling channel for the power bus current when the first photovoltaic unit is abnormal;
- At least one second shutdown module coupled to the second input terminal, the second shutdown module includes at least a second switch tube;
- a control module which takes power from the first input terminal, and is used to respectively control the turn-on and turn-off of the first switch tube and the second switch tube according to the monitoring signal and the communication signal;
- control module controls the second switching tube to be turned on, and the second switching tube and the freewheeling diode in parallel with the battery sub-string in the second photovoltaic unit are The power bus current provides a freewheeling path.
- the switch further includes a second bypass tube connected in parallel to the output end, when the control module fails, both the first switch tube and the second switch tube are disconnected, and the first switch tube The bypass tube is cut off, and the second bypass tube provides a freewheeling channel for the power bus current.
- the control module controls the first switching tube to be turned off, the second switching tube to be turned on, or to be in a high-frequency switching state, and the
- the second bypass tube provides the first freewheeling channel for the power bus current
- the freewheeling diode, the second switch tube, and the first bypass tube in the second photovoltaic unit are connected in parallel with the battery sub-series to provide the first freewheeling channel for the power bus current.
- control module controls the first switching tube and the second switching tube to be disconnected, and the second bypass tube is a power bus The current provides a freewheeling channel.
- first bypass tube and the second bypass tube are diodes or switch tubes.
- first switching tube is connected between the positive terminal of the first input terminal and the positive terminal of the output terminal
- first bypass tube is connected in parallel to the output of the first shutdown module
- the second switch tube is connected between the positive terminal of the second input terminal and the negative terminal of the first input terminal or between the positive terminal of the second input terminal and the negative terminal of an adjacent second input terminal
- the first switching tube is connected between the negative terminal of the first input terminal and the positive terminal of the second input terminal, and the first bypass tube is connected in parallel to the output of the first shut-off module, so
- the second switch tube is connected between the negative terminal of the second input terminal and the negative terminal of the output terminal or between the negative terminal of the second input terminal and the positive terminal of an adjacent second input terminal.
- control module judges the states of the first photovoltaic unit and the second photovoltaic unit according to the monitoring signal, and the monitoring signal includes the input voltages of the first input terminal and the second input terminal;
- the control module determines that the photovoltaic unit coupled to the input terminal is abnormal; otherwise, it is normal.
- the type of the communication signal is a power line carrier communication signal or a wireless communication signal.
- the communication signal includes a control instruction of the switch, and the control module adjusts the operation mode of the switch according to the control instruction, and the operation mode of the switch includes a safe disconnection mode and a normal operation mode;
- control module controls the first switching tube and the second switching tube to be disconnected, and the first photovoltaic unit and the second photovoltaic unit are respectively disconnected from the power bus. open connection;
- the control module controls the first switch to conduct and controls the second switch to conduct On or in a high-frequency switching state, the first bypass tube is cut off, and both the first photovoltaic unit and the second photovoltaic unit are connected to the power bus.
- the present invention provides a control method of a multi-input switch, the method is used to control a multi-input switch with a first input terminal and at least one second input terminal, the first input terminal is coupled to connected to the first photovoltaic unit, the second input terminal is coupled to the second photovoltaic unit, the first photovoltaic unit and the second photovoltaic unit respectively include at least one battery substring and a freewheeling diode connected in parallel with the battery substring, the Methods include:
- the second switching tube When the second photovoltaic unit is abnormal, the second switching tube is controlled to be turned on, and the second switching tube and the freewheeling diode in parallel with the battery sub-string in the second photovoltaic unit provide freewheeling for the power bus current road.
- the present invention provides a photovoltaic power generation system, the system includes a plurality of photovoltaic units, a plurality of multi-input disconnectors, a main controller and a photovoltaic inverter, and each multi-input disconnector is connected to multiple A photovoltaic unit, the outputs of multiple multi-input disconnectors are connected in series on a power bus, and the power bus is connected to the DC input port of the photovoltaic inverter, and the multi-input disconnector includes a first input terminal, at least A second input terminal, a first shutdown module, at least one second shutdown module, a control module and an output terminal, the first input terminal is coupled to a first photovoltaic unit, and the first photovoltaic unit includes at least one battery subunit string and a freewheeling diode connected in parallel with the battery substring, the second input terminal is coupled to a second photovoltaic unit, and the second photovoltaic unit includes at least one battery substring and a freewheeling
- the main controller periodically sends a communication signal, and the communication signal is used to control the multi-input switch;
- the switch is used to control the turn-on and turn-off of the first switch tube and the second switch tube respectively according to the monitoring signal and the communication signal, and control the second switch tube when the second photovoltaic unit is abnormal.
- the second switch tube and the freewheeling diode connected in parallel with the battery sub-string in the second photovoltaic unit provide a freewheeling channel for the power bus current.
- the present invention provides a multi-input switch and its control method, which has the beneficial effects of: by multiplexing the built-in freewheeling diode of the photovoltaic module, the corresponding shutdown inside the switch is omitted.
- the bypass tube of the module not only reduces the number of bypass tubes, but also transfers the bypass loss to the built-in freewheeling diode of the photovoltaic module, which reduces the bypass loss and heat generation inside the switch, and improves the efficiency;
- the solution simplifies the circuit structure of the disconnector and reduces the cost of the disconnector.
- FIG. 1 is a schematic circuit structure diagram of a prior art circuit breaker
- Fig. 2 is a schematic circuit structure diagram of a multi-input switch according to a first embodiment of the present invention
- Fig. 3 is a schematic circuit structure diagram of a multi-input switch according to a second embodiment of the present invention.
- Fig. 4 is a schematic circuit structure diagram of a multi-input switch according to a third embodiment of the present invention.
- FIG. 5 is a schematic circuit structure diagram of a multi-input switch according to a fourth embodiment of the present invention.
- Fig. 6 is a system block diagram of a photovoltaic power generation system according to the present invention.
- connection When an element is referred to as being “connected to” or “coupled to” another element, the element may be directly on, connected to, or coupled to the other element, or intervening elements may be present. . However, when an element is referred to as being “directly connected to” or “directly coupled to” another element, there are no intervening elements present. To this end, the term “connected” may refer to a physical connection, an electrical connection, etc., with or without intervening components.
- FIG. 2 is a schematic circuit structure diagram of a multi-input switch according to a first embodiment of the present invention.
- the multi-input switch 100 includes:
- the first input terminal 21 is used to couple the first photovoltaic unit 200, the first photovoltaic unit 200 includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring;
- the first shut-off module 23 is coupled to the first input terminal 21.
- the first shut-off module 23 includes at least a first switch tube S1 and a first bypass tube D4.
- the first switch tube S1 is used to control the first photovoltaic unit 200 and the power bus
- the first bypass tube D4 is used to provide a freewheeling channel for the power bus current when the first photovoltaic unit 200 is abnormal;
- the control module 25 is powered from the first input terminal 21, and is used to respectively control the on and off of the first switching tube S1 and the second switching tube S2 according to the monitoring signal and the communication signal;
- the output terminal 26 is used for coupling the power bus, and the outputs of the first shutdown module 23 and the second shutdown module 24 are connected in series to the output terminal 26;
- control module 25 controls the second switching tube S2 to be turned on, and the second switching tube S2 and the second photovoltaic unit 300 connected in parallel with the battery sub-string Freewheeling diodes provide a freewheeling path for the power bus current.
- the first photovoltaic unit 200 includes at least one photovoltaic module, each photovoltaic module includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring, and the second photovoltaic unit 300 includes at least one photovoltaic Each photovoltaic module includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring.
- the multi-input switch 100 will include a first input terminal 21, a second input terminal 22, a first shut-off module 23, a second shut-off module 24, and an output terminal 26, the first shut-off
- the module 23 includes a first switching tube S1 and a first bypass tube D4
- the second shut-off module 24 includes a second switching tube S2
- the first photovoltaic unit 200 includes a photovoltaic module
- each photovoltaic module includes three battery substrings and The freewheeling diodes connected in parallel with the battery substrings
- the second photovoltaic unit 300 includes a photovoltaic module
- each photovoltaic module includes three battery substrings and the freewheeling diodes connected in parallel with the battery substrings. This is the limit.
- the first shutdown module 23 includes a first switch tube S1 and a first bypass tube D4, and the type of the first bypass tube D4 is a diode.
- the first switch tube S1 is connected between the positive terminal of the first input terminal 21 and the positive terminal of the output terminal 26, its source is connected to the positive terminal of the output terminal 26, and its drain is connected to the positive terminal of the first input terminal 21,
- the first switching tube S1 controls the on-off of the connection between the first photovoltaic unit 200 coupled to the first input terminal 21 and the power bus.
- the first bypass tube D4 is connected in parallel to the output of the first shutdown module 23 , its cathode is connected to the positive terminal of the output terminal 26 , and its anode is connected to the negative terminal of the first input terminal 21 .
- the second shut-off module 24 includes a second switch tube S2, the second switch tube S2 is connected between the negative terminal of the first input terminal 21 and the positive terminal of the second input terminal 22, and its source is connected to the positive terminal of the first input terminal 21. The negative terminal is connected, the drain is connected to the positive terminal of the second input terminal 22 , and is used to control the connection between the second photovoltaic unit 300 coupled to the second input terminal 22 and the power bus.
- the second switch tube S2 and the freewheeling diode in the second photovoltaic unit 300 connected in parallel with the battery sub-series together provide a freewheeling channel for the power bus current.
- the first switch tube S1 can be connected between the negative terminal of the first input terminal 21 and the positive terminal of the second input terminal 22, and its source is connected to the negative terminal of the first input terminal 21. , the drain is connected to the positive terminal of the second input terminal 22 .
- the second switch tube S2 is connected between the negative terminal of the second input terminal 22 and the negative terminal of the output terminal 26 , its source is connected to the negative terminal of the second input terminal 22 , and its drain is connected to the negative terminal of the output terminal 26 .
- the control module 25 judges the states of the first photovoltaic unit 200 and the second photovoltaic unit 300 according to the monitoring signal, the monitoring signal includes the input and output electrical parameters of the switch 100, and the input and output electrical parameters include the shutdown
- Each input terminal of the switch 100 is coupled to the output voltage of the photovoltaic unit, that is, the input voltage of the first input terminal 21 and the second input terminal 22 of the switch 100 .
- a voltage threshold When the input voltage of the first input terminal 21 or the input voltage of the second input terminal 22 of the switch 100 is less than a voltage threshold, it is determined that the photovoltaic unit coupled to the input terminal is abnormal; otherwise, it is normal.
- Abnormal conditions of the photovoltaic unit are, for example, shading, failure, and the like.
- the communication signal includes a control command of the switch 100, and the control module 25 adjusts the operation mode of the switch 100 according to the control command.
- the operation mode of the switch 100 includes a safe disconnection mode and a normal run mode.
- the control module 25 controls the first switching tube S1 and the second switching tube S2 to be disconnected, and the first photovoltaic unit 200 and the second photovoltaic unit 300 are respectively disconnected from the power bus and turned off.
- the output voltage and power of the breaker 100 are in a safe and controlled state.
- the control module 25 controls the first switch tube S1 to be turned on, and controls the second switch tube S2 to be turned on or in In the high-frequency switching state, the first bypass tube D4 is reversely cut off, the first photovoltaic unit 200 connected to the first input terminal 21 and the second photovoltaic unit 300 connected to the second input terminal 22 are connected to the power bus and turned off
- the output power of the device 100 is equal to the sum of the output powers of the first photovoltaic unit 200 and the second photovoltaic unit 300.
- the control module 25 controls the first switching tube S1 to be disconnected, the first photovoltaic unit 200 is disconnected from the power bus, and the first bypass tube D4 is turned on. The power bus current flows through the first bypass tube D4.
- the control module 25 controls the second switching tube S2 to be turned on or to be in a high-frequency switching state, and the power bus current is transferred from the second photovoltaic unit 300 to the freewheeling diode in parallel with the battery substring and the second switch
- the tube S2 flows through, and the built-in freewheeling diode of the second photovoltaic unit 300 and the second switch tube S2 provide a freewheeling channel for the power bus current.
- the output capacitor of the second shut-off module 24 briefly freewheels.
- the switch 100 further includes a communication module 27 for communicating with the outside, obtaining a communication signal, demodulating and analyzing the communication signal to obtain a control instruction of the switch.
- the communication module 27 is, for example, a power line carrier communication module or a wireless communication module, and correspondingly, the type of the communication signal is a power line carrier communication signal or a wireless communication signal.
- the control module 25 switches the operation mode of the switch 100 according to the control instruction of the switch.
- the form of the communication signal is a power line carrier communication signal.
- the communication module 27 and the control module 25 can be integrated together.
- the first shutdown module 23 further includes a first input capacitor Cin1 coupled to the first input terminal 21 and a first output capacitor Cout1 coupled to the positive terminal of the output terminal 26, the first The input capacitor Cin1 is used to stabilize the input voltage of the first input terminal 21 of the switch 100 , and the first output capacitor Cout1 is used to stabilize the output voltage of the switch 100 .
- the second shutdown module 24 also includes a second input capacitor Cin2 coupled to the second input terminal 22 and a second output capacitor Cout2 coupled to the negative terminal of the output terminal 26, the second input capacitor Cin2 is used to stabilize the switch The input voltage of the second input terminal 22 of 100 , the second output capacitor Cout2 is used to stabilize the output voltage of the switch 100 , and the first output capacitor Cout1 and the second output capacitor Cout2 are connected in series at the output terminal 26 .
- Fig. 3 is a schematic circuit structure diagram of a multi-input switch 100 according to the second embodiment of the present invention.
- the multi-input switch 100 in this embodiment also includes The second bypass tube D5 of the output terminal 26 provides a freewheeling channel for the power bus current when the control module 25 fails. And when both the first photovoltaic unit 200 and the second photovoltaic unit 300 are abnormal, on the basis of the freewheeling channel in the first embodiment, a new freewheeling channel passing through the second bypass tube D5 is added.
- the type of the second bypass tube D5 is a diode.
- the control module 25 fails, both the first switch tube S1 and the second switch tube S2 are turned off, the first bypass tube D4 is cut off, and the second bypass tube Tube D5 provides a freewheeling channel for the power bus current.
- the control module 25 controls the first switching tube S1 to be turned off, the second switching tube S2 to be turned on, and the second bypass tube D5 to provide the first power bus current.
- the freewheeling channel, the freewheeling diode in the second photovoltaic unit 300 connected in parallel with the battery sub-string, the second switching tube S2 and the first bypass tube D4 provide a second freewheeling channel for the power bus current.
- the control module 25 controls both the first switch tube S1 and the second switch tube S2 to be turned off, and the first bypass tube D4 When cut off, the second bypass tube D5 provides a freewheeling channel for the power bus current.
- a bypass tube is added to provide a bypass path when the control module fails, and the application range is wider.
- a new bypass path is provided. road path.
- FIG. 4 is a schematic circuit structure diagram of a multi-input switch 100 according to the third embodiment of the present invention.
- the type of the circuit tube D4 is the third switch tube S3, which is used to reduce the conduction loss when the power bus current continues to flow when the first photovoltaic unit 200 is abnormal.
- FIG. 5 is a schematic circuit structure diagram of a multi-input switch 100 according to a fourth embodiment of the present invention.
- the multi-input switch 100 in this embodiment also includes a A shut-off module 23 and a second shut-off module 24 are connected in series to the second shut-off module 28 at the output terminal 26.
- the second shut-off module 28 and the second shut-off module 24 have the same structure, and will not be repeated here.
- the working principle is the same as that of the second embodiment and will not be repeated here.
- This embodiment only takes a switch with three input ports as an example, but it is not limited thereto, and there may be any number of input ports such as four or five.
- the present invention provides a control method of a multi-input switch 100, which is used in a multi-input switch with a first input terminal 21 and at least one second input terminal 22,
- the first input terminal 21 is coupled to the first photovoltaic unit 200
- the second input terminal 22 is coupled to the second photovoltaic unit 300.
- the first photovoltaic unit 200 includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring.
- the photovoltaic unit 300 includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring, and the method includes:
- the second switching tube S2 When the second photovoltaic unit 200 is abnormal, the second switching tube S2 is controlled to be turned on, and the second switching tube S2 and the freewheeling diode in the second photovoltaic unit 200 in parallel with the battery sub-string provide a freewheeling channel for the power bus current.
- the monitoring signal includes the input and output electrical parameters of the switch 100, and the input and output electrical parameters include the photovoltaic units coupled to each input terminal of the switch 100
- the output voltage that is, the input voltage of each input terminal of the switch 100 , when the input voltage of an input terminal of the switch 100 is less than a voltage threshold, it is determined that the photovoltaic unit coupled to the input terminal is abnormal, otherwise it is normal.
- Abnormal conditions of the photovoltaic unit are, for example, shading, failure, and the like.
- the communication signal includes a control command of the switch 100, and the operation mode of the switch is switched according to the control command.
- the operating modes of the disconnector 100 include a safe-open mode and a normal operating mode.
- the switch 100 When the switch 100 is in the safe disconnection mode, the first switching tube S1 and the second switching tube S2 are controlled to be disconnected, and the first photovoltaic unit 200 and the second photovoltaic unit 300 are respectively disconnected from the power bus, and the switch 100 The output voltage and power are in a safe and controlled state.
- the switch 100 When the switch 100 is in the normal operation mode, when both the first photovoltaic unit 200 and the second photovoltaic unit 300 are normal, the first switching tube S1 is controlled to be turned on, and the second switching tube S2 is controlled to be turned on or in a high-frequency switching state , the first bypass tube D4 in the switch 100 is reversely cut off, the first photovoltaic unit 200 connected to the first input terminal 21 and the second photovoltaic unit 300 connected to the second input terminal 22 are both connected to the power bus, The output power of the switch 100 is equal to the sum of the output powers of the first photovoltaic unit 200 and the second photovoltaic unit 300 .
- the first switching tube S1 When the first photovoltaic unit 200 is abnormal, the first switching tube S1 is controlled to be disconnected, the first photovoltaic unit 200 is disconnected from the power bus, the first bypass tube D4 is turned on, and the power bus current flows from the first bypass tube D4 Pass.
- the second switching tube S2 When the second photovoltaic unit 300 is abnormal, the second switching tube S2 is controlled to be turned on or in a high-frequency switching state, and the power bus current flows from the freewheeling diode in the second photovoltaic unit 300 connected in parallel with the battery sub-string and the second switching tube S2
- the built-in freewheeling diode of the second photovoltaic unit 300 and the second switch tube S2 provide a freewheeling channel for the power bus current.
- the second output capacitor Cout2 briefly freewheels.
- Fig. 6 is a schematic system block diagram of a photovoltaic power generation system according to an embodiment of the present invention.
- the system includes a plurality of photovoltaic units 60, a plurality of multi-input disconnectors 61, a main controller 62 and Photovoltaic inverter 63, each multi-input switch 61 is connected to multiple photovoltaic units 60, multiple multi-input switch 61 is connected in series to a power bus, and the power bus is connected to the DC input of photovoltaic inverter 63 port, the multi-input switch includes a first input terminal 21, at least one second input terminal 22, a first shutdown module 23, at least one second shutdown module 24, a control module 25 and an output terminal 26, the first input terminal 21 is coupled to the first photovoltaic unit 200.
- the first photovoltaic unit 200 includes at least one battery substring and a freewheeling diode connected in parallel with the battery substring.
- the second input terminal 22 is coupled to the second photovoltaic unit 300.
- the second photovoltaic unit 300 includes At least one battery substring and a freewheeling diode connected in parallel with the battery substring,
- the first shutdown module 23 includes at least a first switch tube S1 and a first bypass tube D4, and the second shutdown module 24 includes at least a second switch tube S2 ,in,
- the main controller 62 regularly sends communication signals, and the communication signals are used to control the multi-input switch 61,
- the communication signal may be a power line carrier communication signal or a wireless communication signal
- the power line carrier communication signal is coupled to the multi-input switch 61 through a power bus
- the wireless communication signal is coupled to the multi-input switch-off device 61 through space. device 61;
- the multi-input switch 61 is used to respectively control the on and off of the first switch tube S1 and the second switch tube S2 according to the monitoring signal and the communication signal, and to control the second switch tube S2 when the second photovoltaic unit 300 is abnormal.
- S2 is turned on, and the second switching tube S2 and the freewheeling diode in the second photovoltaic unit 300 connected in parallel with the battery sub-string provide a freewheeling channel for the power bus current.
- the main controller 62 can be integrated inside the photovoltaic inverter 63 or can be set independently, but it is not limited thereto.
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Abstract
本发明公开了一种多输入关断器，包括：第一输入端，耦接第一光伏单元；至少一个第二输入端，耦接第二光伏单元，第二光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管；第一关断模块至少包括第一开关管和第一旁路管，第一旁路管当第一光伏单元异常时为功率总线电流提供续流通道；至少一个第二关断模块，至少包括第二开关管；控制模块根据监测信号和通信信号分别控制第一开关管和第二开关管的导通与关断，当第二光伏单元异常时，控制模块控制第二开关管导通，第二开关管和第二光伏单元中与电池子串并联的续流二极管为功率总线电流提供续流通道。该发明复用光伏组件内置的续流二极管，省去关断器内部关断模块的旁路管，降低旁路损耗。
Description
本发明涉及分布式光伏发电技术领域，尤其涉及一种多输入关断器及控制方法、光伏发电系统。
由于太阳能的可再生性及清洁性，光伏发电技术得以迅猛发展。组串式光伏发电系统由于技术成熟、转换效率高、价格低廉等优势，在光伏发电领域得到了广泛的应用，但组串式光伏发电系统的直流高压会带来拉弧起火及触电危险，在光伏发电系统出现火灾时，给消防员的灭火作业带来极大的安全隐患。现有的解决方案是为每个光伏组件配置组件级快速关断设备，例如关断器，在出现火灾等异常情况时，通过关断器来切断每个光伏组件的输出，降低光伏组件的输出电压，从而降低消防及运维人员的触电风险。
市场上主流的关断器一般配置两个输入端口，接入两个光伏组件，通过复用控制器及结构件来实现单瓦成本的下降。现有的二输入关断器的技术方案如图1所示，关断器包括通信模块、控制模块、旁路二极管D1-D3以及安全开关Q1和Q2，其中旁路二极管D1用于在第一光伏组件异常时旁路第一光伏组件，旁路二极管D2用于在第二光伏组件异常时旁路第二光伏组件，当第一光伏组件和第二光伏组件均异常时，功率总线上的大电流通过旁路二极管D1和D2时，会产生较大的功率损耗，发热量大。进一步的改进方案是在关断器的输出端再并联一个旁路二极管D3，当第一光伏组件和第二光伏组件均异常或控制器异常时，通过旁路二极管D3旁路第一光伏组件和第二光伏组件，从而降低续流损耗及发热量，但该种方式所需二极管数量较多，成本高。
发明内容
有鉴于此，本发明的目的在于提供一种多输入关断器及其控制方法，通过复用光伏组件内置的续流二极管，省去关断器内部对应关断模块的旁路管， 并降低关断器内部的旁路损耗。
为实现上述目的，本发明提供一种多输入关断器，所述关断器包括：
第一输入端，用于耦接第一光伏单元，所述第一光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管；
至少一个第二输入端，用于耦接第二光伏单元，所述第二光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管；
第一关断模块，与所述第一输入端耦接，所述第一关断模块至少包括第一开关管和第一旁路管，所述第一开关管用于控制第一光伏单元和功率总线之间的通断，所述第一旁路管用于当所述第一光伏单元异常时为功率总线电流提供续流通道；
至少一个第二关断模块，与所述第二输入端耦接，所述第二关断模块至少包括第二开关管；
控制模块，从所述第一输入端取电，用于根据监测信号和通信信号分别控制所述第一开关管和所述第二开关管的导通与关断；
输出端，用于耦接功率总线，所述第一关断模块和第二关断模块的输出串联连接在所述输出端；
其中，当所述第二光伏单元异常时，所述控制模块控制所述第二开关管导通，所述第二开关管和所述第二光伏单元中与电池子串并联的续流二极管为功率总线电流提供续流通道。
进一步地，所述关断器还包括并联在所述输出端的第二旁路管，当所述控制模块发生故障时，所述第一开关管和第二开关管均断开，所述第一旁路管截止，所述第二旁路管为功率总线电流提供续流通道。
进一步地，当所述第一光伏单元和第二光伏单元均异常时，所述控制模 块控制所述第一开关管断开、所述第二开关管导通或处于高频开关状态，所述第二旁路管为功率总线电流提供第一条续流通道，所述第二光伏单元中与电池子串并联的续流二极管、第二开关管和第一旁路管为功率总线电流提供第二条续流通道。
进一步地，当所述第一光伏单元和第二光伏单元均异常时，所述控制模块控制所述第一开关管和所述第二开关管断开，所述第二旁路管为功率总线电流提供续流通道。
进一步地，所述第一旁路管和第二旁路管的类型为二极管或开关管。
进一步地，所述第一开关管连接在所述第一输入端的正端和所述输出端的正端之间，所述第一旁路管并联在所述第一关断模块的输出，所述第二开关管连接在所述第二输入端的正端和所述第一输入端的负端或连接在所述第二输入端的正端和相邻第二输入端的负端之间；
或者，所述第一开关管连接在所述第一输入端的负端和所述第二输入端的正端之间，所述第一旁路管并联在所述第一关断模块的输出，所述第二开关管连接在所述第二输入端的负端和所述输出端的负端或连接在所述第二输入端的负端和相邻第二输入端的正端之间。
进一步地，所述控制模块根据所述监测信号判断所述第一光伏单元和所述第二光伏单元的状态，所述监测信号包括所述第一输入端和第二输入端的输入电压；
当所述第一输入端或第二输入端的输入电压小于一电压阈值时，所述控制模块判定该输入端耦接的光伏单元异常，否则为正常。
进一步地，所述通信信号的类型为电力线载波通信信号或无线通信信号。
进一步地，所述通信信号包括关断器的控制指令，所述控制模块根据所述控制指令调整关断器的运行模式，所述关断器的运行模式包括安全断开模 式和正常运行模式；
当所述关断器处于安全断开模式时，所述控制模块控制所述第一开关管和所述第二开关管断开，所述第一光伏单元和第二光伏单元分别与功率总线断开连接；
当关断器处于正常运行模式时，且所述第一光伏单元和所述第二光伏单元均正常时，所述控制模块控制所述第一开关管导通，控制所述第二开关管导通或处于高频开关状态，所述第一旁路管截止，所述第一光伏单元和第二光伏单元均与功率总线连通。
为实现上述目的，本发明提供一种多输入关断器的控制方法，所述方法用于控制具有第一输入端以及至少一个第二输入端的多输入关断器，所述第一输入端耦接第一光伏单元，所述第二输入端耦接第二光伏单元，所述第一光伏单元和第二光伏单元分别包括至少一个电池子串以及与电池子串并联的续流二极管，所述方法包括：
根据监测信号和通信信号分别控制关断器中的第一开关管和第二开关管的导通与关断；
当所述第二光伏单元异常时，控制所述第二开关管导通，所述第二开关管和所述第二光伏单元中与电池子串并联的续流二极管为功率总线电流提供续流通道。
为实现上述目的，本发明提供一种光伏发电系统，所述系统包括多个光伏单元、多个多输入关断器、主控器及光伏逆变器，每一个多输入关断器接入多个光伏单元，多个多输入关断器的输出串接在一功率总线上，所述功率总线接入光伏逆变器的直流输入端口，所述多输入关断器包括第一输入端、至少一个第二输入端、第一关断模块、至少一个第二关断模块、控制模块以及输出端，所述第一输入端耦接第一光伏单元，所述第一光伏单元包括至少 一个电池子串以及与电池子串并联的续流二极管，所述第二输入端耦接第二光伏单元，所述第二光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管，所述第一关断模块至少包括第一开关管和第一旁路管，所述第二关断模块至少包括第二开关管，其中，
所述主控器，定期发送通信信号，所述通信信号用于控制所述多输入关断器；
所述关断器，用于根据监测信号和通信信号分别控制第一开关管和第二开关管的导通与关断，并当所述第二光伏单元异常时，控制所述第二开关管导通，所述第二开关管和所述第二光伏单元中电池子串并联的续流二极管为功率总线电流提供续流通道。
与现有技术相比，本发明提供一种多输入关断器及其控制方法，所带来的有益效果为：通过复用光伏组件内置的续流二极管，省去关断器内部对应关断模块的旁路管，既减少了旁路管的数量，又将旁路损耗转移到光伏组件内置的续流二极管中，降低了关断器内部的旁路损耗和发热量，提高了效率；该方案简化了关断器的电路结构，降低了关断器成本。
图1是现有技术的关断器的示意性电路结构图；
图2是根据本发明的第一实施例的多输入关断器的示意性电路结构图；
图3是根据本发明的第二实施例的多输入关断器的示意性电路结构图；
图4是根据本发明的第三实施例的多输入关断器的示意性电路结构图；
图5是根据本发明的第四实施例的多输入关断器的示意性电路结构图；
图6是根据本发明的光伏发电系统的系统框图。
以下将结合附图所示的具体实施方式对本发明进行详细描述，但这些实施方式并不限制本发明，本领域的普通技术人员根据这些实施方式所做出的结构、方法、或功能上的变换均包含在本发明的保护范围内。
当一个部件被称作“连接到”或“结合到”另一部件时，该部件可以直接在所述另一部件上、直接连接到或直接结合到所述另一部件，或者可以存在中间部件。然而，当部件被称作“直接连接到”或“直接结合到”另一部件时，不存在中间部件。为此，术语“连接”可以指物理连接、电气连接等，并且具有或不具有中间部件。
图2为本发明第一实施例的多输入关断器的示意性电路结构图，该多输入关断器100包括：
第一输入端21，用于耦接第一光伏单元200，第一光伏单元200包括至少一个电池子串以及与电池子串并联的续流二极管；
至少一个第二输入端22，用于耦接第二光伏单元300，第二光伏单元300包括至少一个电池子串以及与电池子串并联的续流二极管；
第一关断模块23，与第一输入端21耦接，第一关断模块23至少包括第一开关管S1和第一旁路管D4，第一开关管S1用于控制第一光伏单元200和功率总线之间的通断，第一旁路管D4用于当第一光伏单元200异常时为功率总线电流提供续流通道；
至少一个第二关断模块24，与第二输入端22耦接，第二关断模块24至少包括第二开关管S2；
控制模块25，从第一输入端21取电，用于根据监测信号和通信信号分别控制第一开关管S1和第二开关管S2的导通与关断；
输出端26，用于耦接功率总线，第一关断模块23和第二关断模块24的输出串联后连接至输出端26；
其中，当第二输入端22所耦接的第二光伏单元300异常时，控制模块25控制第二开关管S2导通，第二开关管S2和第二光伏单元300中与电池子串并联的续流二极管为功率总线电流提供续流通道。
作为本发明的一种实现方式，第一光伏单元200包括至少一个光伏组件，每个光伏组件包括至少一个电池子串以及与电池子串并联的续流二极管，第二光伏单元300包括至少一个光伏组件，每个光伏组件包括至少一个电池子串以及与电池子串并联的续流二极管。
以下将以多输入关断器100包括一个第一输入端21、一个第二输入端22、一个第一关断模块23、一个第二关断模块24、以及一个输出端26，第一关断模块23包括第一开关管S1和第一旁路管D4，第二关断模块24包括第二开关管S2，第一光伏单元200包括一个光伏组件，每个光伏组件包括三个电池子串以及与电池子串并联的续流二极管，第二光伏单元300包括一个光伏组件，每个光伏组件包括三个电池子串以及与电池子串并联的续流二极管，以此为例进行说明，但不以此为限。
具体的，第一关断模块23包括第一开关管S1和第一旁路管D4，第一旁路管D4的类型为二极管。第一开关管S1连接在第一输入端21的正端和输出端26的正端之间，其源极和输出端26的正端连接，漏极和第一输入端21的正端连接，第一开关管S1控制第一输入端21所耦接的第一光伏单元200和功率总线之间连接的通断。第一旁路管D4并联在第一关断模块23的输出，其阴极和输出端26的正端连接，阳极和第一输入端21的负端连接。当第一光伏单元200异常时，第一旁路管D4用以给功率总线电流提供续流通道。第二关断模块24包括第二开关管S2，第二开关管S2连接在第一输入端21的负端和第二输入端22的正端之间，其源极和第一输入端21的负端连接，漏 极和第二输入端22的正端连接，用于控制第二输入端22所耦接的第二光伏单元300和功率总线之间连接的通断。当第二光伏单元300异常时，第二开关管S2和第二光伏单元300中与电池子串并联的续流二极管一起为功率总线电流提供续流通道。
作为本发明的一种实现方式，第一开关管S1可连接在第一输入端21的负端和第二输入端22的正端之间，其源极和第一输入端21的负端连接，漏极和第二输入端22的正端连接。第二开关管S2连接在第二输入端22的负端和输出端26的负端之间，其源极和第二输入端22的负端连接，漏极和输出端26的负端连接。
作为本发明的一种实现方式，控制模块25根据监测信号判断第一光伏单元200和第二光伏单元300的状态，监测信号包括关断器100的输入输出电气参数，输入输出电气参数包括关断器100的各输入端所耦接光伏单元的输出电压，也即关断器100的第一输入端21和第二输入端22的输入电压。当关断器100的第一输入端21的输入电压或者第二输入端22的输入电压小于一电压阈值时，判定该输入端所耦接的光伏单元异常，否则为正常。光伏单元异常的情况例如为遮挡、故障等。
作为本发明的一种实现方式，通信信号包括关断器100的控制指令，控制模块25根据该控制指令调整关断器100的运行模式，关断器100的运行模式包括安全断开模式和正常运行模式。
当关断器100处于安全断开模式时，控制模块25控制第一开关管S1和第二开关管S2断开，第一光伏单元200和第二光伏单元300分别与功率总线断开连接，关断器100的输出电压和功率处于安全受控状态。
当关断器100处于正常运行模式时，并且当第一光伏单元200和第二光伏单元300均正常时，控制模块25控制第一开关管S1导通，控制第二开关管S2导通或处于高频开关状态，第一旁路管D4反向截止，第一输入端21 接入的第一光伏单元200以及第二输入端22接入的第二光伏单元300均与功率总线连通，关断器100的输出功率等于第一光伏单元200和第二光伏单元300的输出功率之和。当第一光伏单元200异常时，为防止控制模块25掉电，控制模块25控制第一开关管S1断开，第一光伏单元200和功率总线断开连接，第一旁路管D4导通，功率总线电流从第一旁路管D4流过。当第二光伏单元300异常时，控制模块25控制第二开关管S2导通或处于高频开关状态，功率总线电流从第二光伏单元300中与电池子串并联的续流二极管以及第二开关管S2流过，通过第二光伏单元300内置的续流二极管和第二开关管S2为功率总线电流提供续流通道。当第二开关管S2处于高频开关状态时，在第二开关管S2断开的瞬间，由第二关断模块24的输出电容短暂续流。
作为本发明的一种实现方式，关断器100还包括通信模块27，用于与外部通信，获得通信信号并对所述通信信号进行解调和解析得到关断器的控制指令。通信模块27例如为电力线载波通信模块或无线通信模块，相应的，通信信号的类型为电力线载波通信信号或无线通信信号。控制模块25根据关断器的控制指令切换关断器100的运行模式。在本实施方式，通信信号的形式为电力线载波通信信号。
作为本发明的一种实现方式，通信模块27和控制模块25可以集成在一起。
作为本发明的一种实现方式，第一关断模块23还包括与第一输入端21耦接的第一输入电容Cin1以及与输出端26的正端耦接的第一输出电容Cout1，第一输入电容Cin1用于稳定关断器100的第一输入端21的输入电压，第一输出电容Cout1用于稳定关断器100的输出电压。第二关断模块24还包括与第二输入端22耦接的第二输入电容Cin2以及与输出端26的负端耦接的第二输出电容Cout2，第二输入电容Cin2用于稳定关断器100的第二输入端22的输入电压，第二输出电容Cout2用于稳定关断器100的输出电压，第一输出电容Cout1和第二输出电容Cout2串联连接在输出端26。
图3为本发明第二实施例的多输入关断器100的示意性电路结构图，与图2所示的第一实施例相比，本实施例中多输入关断器100还包括并联在输出端26的第二旁路管D5，在控制模块25发生故障时，第二旁路管D5为功率总线电流提供续流通道。并且第一光伏单元200和第二光伏单元300均异常时，在第一实施例的续流通道的基础上，新增一条通过第二旁路管D5的续流通道。
具体的，第二旁路管D5的类型为二极管，当控制模块25发生故障时，第一开关管S1和第二开关管S2均断开，第一旁路管D4截止，通过第二旁路管D5为功率总线电流提供续流通道。当第一光伏单元200和第二光伏单元300均异常时，控制模块25控制第一开关管S1断开、第二开关管S2导通，第二旁路管D5为功率总线电流提供第一条续流通道，第二光伏单元300中与电池子串并联的续流二极管、第二开关管S2和第一旁路管D4为功率总线电流提供第二条续流通道。
作为本发明的一种实现方式，当第一光伏单元200和第二光伏单元300均异常时，控制模块25控制第一开关管S1和第二开关管S2均断开，第一旁路管D4截止，第二旁路管D5为功率总线电流提供续流通道。
第二实施例中与第一实施例中其它相同之处不在赘述。与第一实施例相比，增加一个旁路管，提供了控制模块故障时的旁路路径，适用范围更广，同时在关断器各输入端的光伏单元均异常时，提供了一条新的旁路路径。
图4是本发明第三实施例的多输入关断器100的示意性电路结构图，与图3所示的第二实施例相比，本实施例第一关断模块23中的第一旁路管D4类型为第三开关管S3，用于降低第一光伏单元200异常时功率总线电流续流时的导通损耗，其工作原理同第二实施例，不再赘述。
图5为本发明第四实施例的多输入关断器100的示意性电路结构图，与图3所示的第二实施例相比，本实施例中多输入关断器100还包括与第一关 断模块23和第二关断模块24串联连接在输出端26的第二关断模块28，第二关断模块28和第二关断模块24的结构相同，在此不再赘述。工作原理同第二实施例不再赘述。本实施例仅以三个输入端口的关断器为例，但不以此为限，可以是四个、五个等任意个输入端。
作为本发明的一种实现方式，本发明提供一种多输入关断器100的控制方法，该方法用在具有第一输入端21以及至少一个第二输入端22的多输入关断器中，第一输入端21耦接第一光伏单元200，第二输入端22耦接第二光伏单元300，第一光伏单元200包括至少一个电池子串以及与电池子串并联的续流二极管，第二光伏单元300包括至少一个电池子串以及与电池子串并联的续流二极管，该方法包括：
根据监测信号和通信信号分别控制多输入关断器100中的第一开关管S1和第二开关管S2的导通与关断；
当第二光伏单元200异常时，控制第二开关管S2导通，第二开关管S2和第二光伏单元200中与电池子串并联的续流二极管为功率总线电流提供续流通道。
根据监测信号判断第一光伏单元200和第二光伏单元300的状态，监测信号包括关断器100的输入输出电气参数，输入输出电气参数包括关断器100的各输入端所耦接光伏单元的输出电压，也即关断器100的各输入端的输入电压，当关断器100的一输入端的输入电压小于一电压阈值时，判定该输入端耦接的光伏单元异常，否则为正常。光伏单元异常的情况例如为遮挡、故障等。
通信信号包括关断器100的控制指令，根据该控制指令切换关断器的运行模式。关断器100的运行模式包括安全断开模式和正常运行模式。
当关断器100处于安全断开模式时，控制第一开关管S1和第二开关管 S2断开，第一光伏单元200和第二光伏单元300分别与功率总线断开连接，关断器100的输出电压和功率处于安全受控状态。
当关断器100处于正常运行模式时，当第一光伏单元200和第二光伏单元300均正常时，控制第一开关管S1导通，控制第二开关管S2导通或处于高频开关状态，关断器100中的第一旁路管D4反向截止，第一输入端21接入的第一光伏单元200以及第二输入端22接入的第二光伏单元300均与功率总线连通，关断器100的输出功率等于第一光伏单元200和第二光伏单元300的输出功率之和。当第一光伏单元200异常时，控制第一开关管S1断开，第一光伏单元200和功率总线断开连接，第一旁路管D4导通，功率总线电流从第一旁路管D4流过。当第二光伏单元300异常时，控制第二开关管S2导通或处于高频开关状态，功率总线电流从第二光伏单元300中与电池子串并联的续流二极管以及第二开关管S2流过，通过第二光伏单元300内置的续流二极管和第二开关管S2为功率总线电流提供续流通道，当第二开关管S2处于高频开关状态时，在第二开关管S2断开的瞬间，由第二输出电容Cout2短暂续流。
图6是为本发明实施例的光伏发电系统的示意性系统框图，所述系统包括多个光伏单元60、多个如上所述任一实施例的多输入关断器61、主控器62及光伏逆变器63，每一个多输入关断器61接入多个光伏单元60，多个多输入关断器61串接在一功率总线上，功率总线接入光伏逆变器63的直流输入端口，多输入关断器包括第一输入端21、至少一个第二输入端22、第一关断模块23、至少一个第二关断模块24、控制模块25以及输出端26，第一输入端21耦接第一光伏单元200，第一光伏单元200包括至少一个电池子串以及与电池子串并联的续流二极管，第二输入端22耦接第二光伏单元300，第二光伏单元300包括至少一个电池子串以及与电池子串并联的续流二极管，第一关断模块23至少包括第一开关管S1和第一旁路管D4，第二关断模块24至少包括第二开关管S2，其中，
主控器62，定期发送通信信号，所述通信信号用于控制多输入关断器61，
具体的，所述通信信号可以为电力线载波通信信号或无线通信信号，所述电力线载波通信信号通过功率总线耦合至所述多输入关断器61，所述无线通信信号通过空间耦合至多输入关断器61；
多输入关断器61，用于根据监测信号和通信信号分别控制第一开关管S1和第二开关管S2的导通与关断，并当第二光伏单元300异常时，控制第二开关管S2导通，第二开关管S2和第二光伏单元300中与电池子串并联的续流二极管为功率总线电流提供续流通道。
主控器62可以集成在光伏逆变器63的内部，也可以独立设置，但不限于此。
尽管为示例目的，已经公开了本发明的优选实施方式，但是本领域的普通技术人员将意识到，在不脱离由所附的权利要求书公开的本发明的范围和精神的情况下，各种改进、增加以及取代是可能的。
Claims (11)
- 一种多输入关断器，其特征在于，所述关断器包括：第一输入端，用于耦接第一光伏单元，所述第一光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管；至少一个第二输入端，用于耦接第二光伏单元，所述第二光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管；第一关断模块，与所述第一输入端耦接，所述第一关断模块至少包括第一开关管和第一旁路管，所述第一开关管用于控制第一光伏单元和功率总线之间的通断，所述第一旁路管用于当所述第一光伏单元异常时为功率总线电流提供续流通道；至少一个第二关断模块，与所述第二输入端耦接，所述第二关断模块至少包括第二开关管；控制模块，从所述第一输入端取电，用于根据监测信号和通信信号分别控制所述第一开关管和所述第二开关管的导通与关断；输出端，用于耦接功率总线，所述第一关断模块和第二关断模块的输出串联连接在所述输出端；其中，当所述第二光伏单元异常时，所述控制模块控制所述第二开关管导通，所述第二开关管和所述第二光伏单元中与电池子串并联的续流二极管为功率总线电流提供续流通道。
- 如权利要求1所述的多输入关断器，其特征在于，所述关断器还包括并联在所述输出端的第二旁路管，当所述控制模块发生故障时，所述第一开关管和第二开关管均断开，所述第一旁路管截止，所述第二旁路管为功率总线电流提供续流通道。
- 如权利要求2所述的多输入关断器，其特征在于,当所述第一光伏单元和第二光伏单元均异常时，所述控制模块控制所述第一开关管断开、所述第二开关管导通或处于高频开关状态，所述第二旁路管为功率总线电流提供第一条续流通道，所述第二光伏单元中与电池子串并联的续流二极管、第二开关管和第一旁路管为功率总线电流提供第二条续流通道。
- 如权利要求2所述的多输入关断器，其特征在于，当所述第一光伏单元和第二光伏单元均异常时，所述控制模块控制所述第一开关管和所述第二开关管断开，所述第二旁路管为功率总线电流提供续流通道。
- 如权利要求2所述的多输入关断器，其特征在于，所述第一旁路管和第二旁路管的类型为二极管或开关管。
- 如权利要求1-5任意一项所述的多输入关断器，其特征在于，所述第一开关管连接在所述第一输入端的正端和所述输出端的正端之间，所述第一旁路管并联在所述第一关断模块的输出，所述第二开关管连接在所述第二输入端的正端和所述第一输入端的负端或连接在所述第二输入端的正端和相邻第二输入端的负端之间；或者，所述第一开关管连接在所述第一输入端的负端和所述第二输入端的正端之间，所述第一旁路管并联在所述第一关断模块的输出，所述第二开关管连接在所述第二输入端的负端和所述输出端的负端或连接在所述第二输入端的负端和相邻第二输入端的正端之间。
- 如权利要求6所述的多输入关断器，其特征在于，所述控制模块根据所述监测信号判断所述第一光伏单元和所述第二光伏单元的状态，所述监测信号包括所述第一输入端和第二输入端的输入电压；当所述第一输入端或第二输入端的输入电压小于一电压阈值时，所述控制模块判定该输入端耦接的光伏单元异常，否则为正常。
- 如权利要求7所述的多输入关断器，其特征在于，所述通信信号的类型为电力线载波通信信号或无线通信信号。
- 如权利要求7所述的多输入关断器，其特征在于，所述通信信号包括关断器的控制指令，所述控制模块根据所述控制指令调整关断器的运行模式，所述关断器的运行模式包括安全断开模式和正常运行模式；当所述关断器处于安全断开模式时，所述控制模块控制所述第一开关管和所述第二开关管断开，所述第一光伏单元和第二光伏单元分别与功率总线断开连接；当关断器处于正常运行模式时，且所述第一光伏单元和所述第二光伏单元均正常时，所述控制模块控制所述第一开关管导通，控制所述第二开关管导通或处于高频开关状态，所述第一旁路管截止，所述第一光伏单元和第二光伏单元均与功率总线连通。
- 一种多输入关断器的控制方法，其特征在于，所述方法用于控制具有第一输入端以及至少一个第二输入端的多输入关断器，所述第一输入端耦接第一光伏单元，所述第二输入端耦接第二光伏单元，所述第一光伏单元和第二光伏单元分别包括至少一个电池子串以及与电池子串并联的续流二极管，所述方法包括：根据监测信号和通信信号分别控制关断器中的第一开关管和第二开关管的导通与关断；当所述第二光伏单元异常时，控制所述第二开关管导通，所述第二开关管和所述第二光伏单元中与电池子串并联的续流二极管为功率总线电流提供续流通道。
- 一种光伏发电系统，其特征在于，所述系统包括多个光伏单元、多个多输入关断器、主控器及光伏逆变器，每一个多输入关断器接入多个光伏单元，多个多输入关断器的输出串接在一功率总线上，所述功率总线接入光伏逆变器的直流输入端口，所述多输入关断器包括第一输入端、至少一个第二输入端、第一关断模块、至少一个第二关断模块、控制模块以及输出端，所述第一输入端耦接第一光伏单元，所述第一光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管，所述第二输入端耦接第二光伏单元，所述第二光伏单元包括至少一个电池子串以及与电池子串并联的续流二极管，所述第一关断模块至少包括第一开关管和第一旁路管，所述第二关断模块至少包括第二开关管，其中，所述主控器，定期发送通信信号，所述通信信号用于控制所述多输入关断器；所述多输入关断器，用于根据监测信号和通信信号分别控制第一开关管和第二开关管的导通与关断，并当所述第二光伏单元异常时，控制所述第二开关 管导通，所述第二开关管和所述第二光伏单元中电池子串并联的续流二极管为功率总线电流提供续流通道。
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