WO2021243501A1 - 一种故障保护装置 - Google Patents
一种故障保护装置 Download PDFInfo
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- WO2021243501A1 WO2021243501A1 PCT/CN2020/093669 CN2020093669W WO2021243501A1 WO 2021243501 A1 WO2021243501 A1 WO 2021243501A1 CN 2020093669 W CN2020093669 W CN 2020093669W WO 2021243501 A1 WO2021243501 A1 WO 2021243501A1
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- port
- bus
- diode
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- fault protection
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- 239000003990 capacitor Substances 0.000 claims description 65
- 238000004146 energy storage Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000005669 field effect Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims 4
- 150000004706 metal oxides Chemical class 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 230000006870 function Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/12—Parallel operation of dc generators with converters, e.g. with mercury-arc rectifier
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Definitions
- This application relates to power systems, and in particular to a fault protection device.
- the photovoltaic energy storage system based on the public DC bus as shown in Figure 1 is widely used in scenarios such as ground power stations, commercial plants, and residential users.
- the photovoltaic energy storage system can improve the power generation capacity of photovoltaic panels. It can provide smooth and reliable electric energy for the grid and improve the economic benefits of the entire power system.
- the protection device includes a fuse.
- the positive local bus of each group of direct current to direct current (DC-DC) converters is connected to the positive common DC bus through the corresponding fuse; the positive local bus of each group of direct current to alternating current (DC-AC) converter passes through the corresponding fuse The wire is connected to the positive common DC bus.
- the rest of the configuration and connection relationship of the photovoltaic energy storage system are the same as the basic photovoltaic energy storage system based on the public DC bus.
- the current in the corresponding branch continues Rising, causing the corresponding fuse to blow, and finally disconnecting the faulty branch from the common DC bus to ensure the safe operation of the common DC bus and other normal equipment connected to the common DC bus.
- the embodiment of the present application provides a fault protection device, which is used to reduce the cost of the power system when the public DC bus power system is safe and reliable.
- the first aspect of the embodiments of the present application provides a fault protection device, which is applied to a power system based on a common DC bus
- the fault protection device specifically includes: a first diode, a first switching device, and a control unit; Wherein, when the first diode is forward conducting, the common DC bus supplies power to the branch where the fault protection device is located; when the control unit controls the first switching device to conduct forward conduction, the branch where the fault protection device is located When the first diode is turned off in the reverse direction and the control unit controls the first switching device to be turned off in the forward direction, the branch circuit is disconnected from the common DC bus; and the fault protection device is located Other equipment of the branch is connected to the public DC bus through the fault protection device.
- the fault protection device specifically further includes a first port, a second port, a third port, a fourth port, and a fifth port; therefore, the fault protection device and the common DC bus and the control unit are connected
- the possible connection relationship is as follows: one side of the first port is connected to the positive common DC bus in the common DC bus, the second port is connected to the negative common DC bus in the common DC bus, and one side of the third port is connected to
- the fault protection device is connected to the positive local bus of the branch where the fault protection device is located, the fourth port is connected to the negative local bus of the branch where the fault protection device is located, and one side of the fifth port is connected to the control terminal of the first switching device ,
- the other side of the fifth port is connected to the control unit; and the first diode and the first switching device are connected through the first port, the second port, the third port, and the fourth port
- the power system the control unit sends a drive signal to control the first switching device, the control unit detects the current in the circuit, when the current exceed
- the branch supplies power to the common DC bus;
- the voltage between the third port and the fourth port is higher than the voltage between the first port and the second port, and the fifth port does not receive a driving signal (that is, the current exceeds the normal range)
- the first port A diode is turned off in the reverse direction, and the first switching device is turned off in the forward direction.
- the branch circuit is disconnected from the common DC bus.
- the diode of the branch and the switching device are cut off, so that the branch where the diode and the switching device are located is disconnected from the common DC bus to ensure that the common The DC bus or the branch circuit equipment is safe, so as to realize the fault protection of the power system.
- the cost of the diode and the switching device is low, and the diode and the switching device will not be damaged when performing the fault protection function. After the fault is restored, only the equipment that caused the fault needs to be maintained, and no maintenance is required. All fault protection devices, thus reducing the cost of the power system.
- the first diode may be composed of multiple diodes in parallel; at the same time, the first switching device may also be composed of multiple switching devices. Composed in parallel.
- the first switching device may be an Insulated Gate Bipolar Transistor (IGBT) or a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
- IGBT Insulated Gate Bipolar Transistor
- MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
- the body diode in the MOSFET may serve as the first diode, that is, in the fault protection device, the MOSFET may not have an additional diode; or, the MOSFET
- the body diode in is used as one of the first diodes, that is, the MOSFET is additionally connected in parallel with an independent diode, and the body diode and the independent diode are used as the first diode.
- the first diode and the first switching device are connected between the positive local bus of the branch where the fault protection device is located and the positive common DC bus of the common DC bus, or between the first diode and the positive common DC bus of the common DC bus.
- the first switching device is connected between the negative local bus of the branch where the fault protection device is located and the negative common DC bus of the common DC bus.
- the fault protection device includes a first port, a second port, a third port, a fourth port, and a fifth port
- the connection relationship is specifically as follows:
- the first diode and the first switching device are connected to the positive common DC bus and the positive local bus.
- the details are as follows: the anode of the first diode is connected to the first port, the cathode of the first diode is connected to the third port, the emitter of the IGBT or the source of the MOSFET is connected to the first port, the IGBT The collector of the MOSFET or the drain of the MOSFET is connected to the third port, and the second port is connected to the fourth port.
- the first diode and the first switching device are connected to the negative common DC bus and the negative local bus.
- the details are as follows: the anode of the first diode is connected to the fourth port, the cathode of the first diode is connected to the second port, the emitter of the IGBT or the source of the MOSFET is connected to the fourth port, the IGBT The collector of the MOSFET or the drain of the MOSFET is connected to the second port, and the first port is connected to the third port.
- the fault protection device can be flexibly connected according to different needs, so as to protect the power system more comprehensively.
- a first capacitor is connected in parallel between the positive common DC bus and the negative common DC bus connected to the branch where the fault protection device is located; or, the positive local DC bus and the negative local DC bus of the branch where the fault protection device is located
- the second capacitor is connected in parallel between the DC buses; or, the first capacitor is connected in parallel between the positive common DC bus and the negative common DC bus connected to the branch where the fault protection device is located, and the first capacitor is connected in parallel between the branch where the fault protection device is located
- the second capacitor is connected in parallel between the local DC bus and the negative local DC bus.
- a first capacitor is connected in parallel between the first port and the second port; or a second capacitor is connected in parallel between the third port and the fourth port; or, the first port and the fourth port are connected in parallel.
- the first capacitor is connected in parallel between the second port, and the second capacitor is connected in parallel between the third port and the fourth port.
- an embodiment of the present application provides a fault protection device, which is applied to a power system based on a public DC bus, and specifically includes: a second diode, a sixth port, a seventh port, and an eighth port And a ninth port; wherein the sixth port is connected to the positive common DC bus in the common DC bus, the seventh port is connected to the negative common DC bus in the common DC bus, and the eighth port is connected to the fault protection device
- the positive local bus of the branch where the ninth port is connected is connected to the negative local bus of the branch where the fault protection device is located;
- the second diode passes through the sixth port, the seventh port, and the eighth port And the ninth port is connected to the power system; when the voltage between the eighth port and the ninth port is lower than the voltage between the sixth port and the seventh port, the second diode is forwarded When the voltage between the eighth port and the ninth port is higher than the voltage between the sixth port and the seventh port, the second diode is reversely blocked.
- the fault protection device can be used for branch circuits that only need to work on the condition that the public DC bus provides electric energy to the local bus, so that under the premise of reliable protection of the power system, the circuit structure and control are further simplified, thereby reducing The cost of the power system.
- the manner in which the second diode is connected to the power system through the sixth port, the seventh port, the eighth port, and the ninth port may have the following possible implementation modes:
- the second diode is connected to the positive common DC bus and the positive local bus.
- the details are as follows: the anode of the second diode is connected to the sixth port, the cathode of the second diode is connected to the eighth port, and the seventh port is connected to the ninth port.
- the second diode is connected to the negative common DC bus and the negative local bus.
- the details are as follows: the anode of the second diode is connected to the ninth port, the cathode of the second diode is connected to the seventh port, and the sixth port is connected to the eighth port.
- the fault protection device can be flexibly connected according to different needs, so as to protect the power system more comprehensively.
- the second diode may be composed of multiple diodes in parallel.
- a third capacitor is connected in parallel between the sixth port and the seventh port; or a fourth capacitor is connected in parallel between the eighth port and the ninth port; or, between the sixth port and the seventh port
- the third capacitor is connected in parallel
- the fourth capacitor is connected in parallel between the eight port and the ninth port.
- a photovoltaic system which is a power system based on a common DC bus, which specifically includes: a common DC bus, a plurality of first fault protection devices, and a plurality of first DC source units And a plurality of first inverter units; the first DC source unit or the branch where the first inverter unit is located is connected to the common DC bus through the first fault protection device; the first fault The protection device includes a first diode, a first switching device, and a control unit; when the first diode is turned on, the common DC bus supplies power to the branch; the control unit controls the first switch When the device is turned on, the branch supplies energy to the common DC bus; when the first diode is turned off in the reverse direction, and the control unit controls the first switching device to turn off in the forward direction, the branch and the common The DC bus is disconnected.
- the common DC bus includes a positive common DC bus and a negative common DC bus;
- the first fault protection device may also include a first port, a second port, a third port, a fourth port, and a fifth port; therefore A possible connection between the first fault protection device and the common DC bus, the first DC source unit, and the first inverter unit is as follows: one side of the first port is connected to the common DC bus The second port is connected to the negative common DC bus of the public DC bus, one side of the third port is connected to the positive local bus of the branch where the fault protection device is located, and the fourth port It is connected to the negative local bus of the branch where the fault protection device is located, one side of the fifth port is connected to the control terminal of the first switching device, and the other side of the fifth port is connected to the control unit; A diode and the first switching device are connected to the power system through the first port, the second port, the third port, and the fourth port; and the control unit sends a driving signal to control the first switching device, The control unit detects
- the control unit stops sending a drive signal to the fifth port; when the current is within the normal range, the control unit sends a drive signal to the fifth port;
- the first diode is forward-conducting, and at this time the common DC bus Supply power to the branch; when the voltage between the third port and the fourth port is higher than the voltage between the first port and the second port, and the fifth port receives a drive signal (that is, the current is normal Within the range), the first diode is reversely blocked, and the first switching device is forwardly conducted.
- the branch supplies power to the common DC bus; when the voltage between the third port and the fourth port is higher than the first When the voltage between a port and the second port, and the fifth port does not receive a driving signal (that is, the current exceeds the normal range), the first diode is turned off in the reverse direction, and the first switching device is turned off in the forward direction, At this time, the branch is disconnected from the common DC bus; one side of the first DC source unit is connected to the third port and the fourth port of the first fault protection device on the same branch as the first DC source unit; One side of the first inverter unit is connected to the third port and the fourth port of the first fault protection device on the same branch as the first inverter unit.
- the diode of the branch and the switching device are cut off, so that the branch where the diode and the switching device are located is disconnected from the common DC bus to ensure that the common DC The bus or the branch equipment is safe, so as to realize the fault protection of the power system.
- the cost of the diode and the switching device is low, and the diode and the switching device will not be damaged when performing the fault protection function. After the fault is restored, only the equipment that caused the fault needs to be maintained, and no maintenance is required. All fault protection devices, thus reducing the cost of the power system.
- the first diode may be composed of multiple diodes in parallel; at the same time, the first switching device may also be composed of multiple switching devices in parallel .
- the first switching device may be an Insulated Gate Bipolar Transistor (IGBT) or a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).
- IGBT Insulated Gate Bipolar Transistor
- MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
- the body diode in the MOSFET may serve as the first diode, that is, in the fault protection device, the MOSFET may not have an additional diode; or, the MOSFET
- the body diode in is used as one of the first diodes, that is, the MOSFET is additionally connected in parallel with an independent diode, and the body diode and the independent diode are used as the first diode.
- the first diode and the first switching device are connected between the positive local bus of the branch where the fault protection device is located and the positive common DC bus of the common DC bus, or between the first diode and the positive common DC bus of the common DC bus.
- the first switching device is connected between the negative local bus of the branch where the fault protection device is located and the negative common DC bus of the common DC bus.
- the fault protection device includes a first port, a second port, a third port, a fourth port, and a fifth port
- the first switching device is an IGBT or a MOSFET
- the anode of the first diode is connected to the first port
- the cathode of the first diode is connected to the third port
- the emitter of the IGBT or the source of the MOSFET is connected to the first port.
- Port, the collector of the IGBT or the drain of the MOSFET is connected to the third port, and the second port is connected to the fourth port.
- the anode of the first diode is connected to the fourth port
- the cathode of the first diode is connected to the second port
- the emitter of the IGBT or the source of the MOSFET is connected to the fourth port.
- the collector of the IGBT or the drain of the MOSFET is connected to the second port
- the first port is connected to the third port.
- the fault protection device can be flexibly connected according to different needs, so as to protect the power system more comprehensively.
- a first capacitor is connected in parallel between the positive common DC bus and the negative common DC bus connected to the branch where the fault protection device is located; or, the positive local DC bus and the negative local DC bus of the branch where the fault protection device is located
- the second capacitor is connected in parallel between the DC buses; or, the first capacitor is connected in parallel between the positive common DC bus and the negative common DC bus connected to the branch where the fault protection device is located, and the first capacitor is connected in parallel between the branch where the fault protection device is located
- the second capacitor is connected in parallel between the local DC bus and the negative local DC bus.
- a first capacitor is connected in parallel between the first port and the second port; or a second capacitor is connected in parallel between the third port and the fourth port; or, the first port and the fourth port are connected in parallel.
- the first capacitor is connected in parallel between the second port, and the second capacitor is connected in parallel between the third port and the fourth port.
- the photovoltaic system may further include multiple second fault protection devices, multiple second direct current source units, and multiple second inverter units;
- the second fault protection device includes a second diode;
- the branch where the second DC source unit is located or the branch where the second inverter unit is located is connected to the common DC bus through the second fault protection device; when the second diode is forward-conducting, The common DC bus provides power to the branch; when the second diode is reversely blocked, the branch where the second diode is located is disconnected from the common DC bus.
- the second fault protection device further includes a sixth port, a seventh port, an eighth port, and a ninth port; wherein, the sixth port is connected to the positive common DC bus in the common DC bus, and the The seventh port is connected to the negative public DC bus in the public DC bus, the eighth port is connected to the positive local bus of the branch where the fault protection device is located, and the ninth port is connected to the negative public DC bus of the branch where the fault protection device is located.
- the local bus is connected; the second diode is connected to the power system through the sixth port, the seventh port, the eighth port, and the ninth port; when the voltage between the eighth port and the ninth port When the voltage between the sixth port and the seventh port is lower, the second diode is forward-conducting, and when the voltage between the eighth port and the ninth port is higher than the voltage between the sixth port and the seventh port When the voltage between the seven ports, the second diode is reversely blocked; one side of the second DC source unit is connected to the eighth port and the eighth port of the second fault protection device on the same branch as the second DC source unit A ninth port; one side of the second inverter unit is connected to the eighth port and the ninth port of the second fault protection device on the same branch as the second inverter unit.
- the fault protection device can be used for branch circuits that only need to work on the condition that the public DC bus provides electric energy to the local bus, so that under the premise of reliable protection of the power system, the circuit structure and control are further simplified, thereby reducing The cost of the power system.
- the second fault protection device is connected between the positive local bus of the branch where the second DC source unit or the second inverter unit is located and the positive common DC bus of the common DC bus; Or, the second fault protection device is connected between the negative local bus of the branch where the second direct current source unit or the second inverter unit is located and the negative common direct current bus of the common direct current bus.
- the second fault protection device includes the sixth port, the seventh port, the eighth port, and the ninth port, the second fault protection device can be connected to the photovoltaic system in the following possible implementation manners:
- the anode of the second diode is connected to the sixth port
- the cathode of the second diode is connected to the eighth port
- the seventh port is connected to the ninth port.
- the anode of the second diode is connected to the ninth port
- the cathode of the second diode is connected to the seventh port
- the sixth port is connected to the eighth port.
- the fault protection device can be flexibly connected according to different needs, so as to protect the power system more comprehensively.
- the second diode may be composed of multiple diodes in parallel.
- a third capacitor is connected in parallel between the positive common DC bus and the negative common DC bus connected to the branch where the second fault protection device is located; or, the positive local DC of the branch where the second fault protection device is located
- a fourth capacitor is connected in parallel between the bus and the negative local DC bus; or, a third capacitor is connected in parallel between the positive common DC bus and the negative common DC bus connected to the branch where the second fault protection device is located, and the second fault
- a fourth capacitor is connected in parallel between the positive local DC bus and the negative local DC bus of the branch where the protection device is located.
- the connection method of the capacitor may be specifically as follows: a third capacitor is connected in parallel between the sixth port and the seventh port ; Or, a fourth capacitor is connected in parallel between the eighth port and the ninth port; or, the third capacitor is connected in parallel between the sixth port and the seventh port, and the eight ports and the ninth port are connected in parallel The fourth capacitor.
- paralleling capacitors between local buses can reduce the inrush current of the fault protection device at the moment of power-on, and paralleling capacitors between the common DC bus can suppress the surge current received by the fault protection device, thereby improving the safety of the fault protection device And reliability.
- the DC source unit includes a DC conversion unit and an energy storage unit; or, the DC source unit includes a DC conversion unit and a load unit; or, the DC source unit includes an energy storage unit or a load unit;
- the system also includes a power grid; the other side of the first inverter unit is connected to the power grid.
- the second DC source unit includes a DC conversion unit and a load unit; or, the second DC source unit includes a load unit; the system further includes a power grid; the other side of the second inverter unit Connect the grid.
- the photovoltaic system may only include the first fault protection device; or when there is a branch in the photovoltaic system that only works when the branch is powered by a common DC bus, the photovoltaic system
- the system includes the first fault protection device and the second fault protection device at the same time, which is not specifically limited here.
- Figure 1 is an exemplary schematic diagram of a power system based on a public DC bus
- Fig. 2 is an exemplary schematic diagram of using fuses for fault protection in a public DC bus-based power system
- Figure 3 is a schematic structural diagram of a photovoltaic system to which a fault protection device is applied in an embodiment of the application;
- Fig. 4 is an exemplary schematic diagram of a fault protection device in an embodiment of the application.
- Fig. 5 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- Fig. 6 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- Fig. 7 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- FIG. 8 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- FIG. 9 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- Fig. 10 is another exemplary schematic diagram of a fault protection device in an embodiment of the application.
- Fig. 11 is another exemplary schematic diagram of a fault protection device in an embodiment of the application.
- Fig. 12 is another exemplary schematic diagram of a fault protection device in an embodiment of the application.
- FIG. 13 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- FIG. 14 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- 15 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- FIG. 16 is another exemplary schematic diagram of the fault protection device in the embodiment of the application.
- the naming or numbering of steps appearing in this application does not mean that the steps in the method flow must be executed in the time/logical order indicated by the naming or numbering.
- the named or numbered process steps can be implemented according to the The technical purpose changes the execution order, as long as the same or similar technical effects can be achieved.
- the division of units presented in this application is a logical division. In actual applications, there can be other divisions. For example, multiple units can be combined or integrated in another system, or some features can be ignored , Or not to execute, in addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection between the units may be in electrical or other similar forms. There are no restrictions in the application.
- the units or subunits described as separate components may or may not be physically separate, may or may not be physical units, or may be distributed to multiple circuit units, and some or all of them may be selected according to actual needs. Unit to achieve the purpose of this application program.
- the embodiment of the present application provides a fault protection device applied to a power system based on a common DC bus.
- the photovoltaic system based on the common DC bus may be as shown in FIG. 3.
- the photovoltaic system includes multiple branches, and the multiple The branches are independently connected to the common DC bus.
- the branch includes a DC source unit and a fault protection device; or the branch includes a grid, an inverter unit and a fault protection device.
- the DC source unit is an energy storage unit and a DC conversion unit; or, the DC source unit is a load unit and a DC conversion unit; or, the DC source unit is an energy storage unit or a load unit.
- the branch includes an energy storage unit and a fault protection unit; or, the branch includes an energy storage unit, a DC conversion unit, and a fault protection device; or, the branch includes a load unit, a DC conversion unit, and a fault protection device; Alternatively, the branch includes the power grid, the inverter unit and the fault protection device.
- the fault protection device includes a control unit
- the control unit can be integrated with other devices in the fault protection device as a whole, and then each branch includes a control unit ; In another possible implementation, the control unit can be an independent device, and then multiple branches can share a control unit.
- the fault protection device is located between the branch equipment and the common DC bus, and is used to connect the branch equipment with the common DC bus.
- the branch The circuit is disconnected from the public DC bus; and, as in the photovoltaic system shown in Figure 3, each branch includes a control unit as an example.
- the fault protection device 400 may be as shown in FIG. 4.
- the fault protection device 400 includes: a first diode 401, a first switching device 402, a first Port 403, second port 404, third port 405, fourth port 406, fifth port 407, and control unit 408; wherein, the first port 403 is connected to the positive common DC bus in the common DC bus, and the second The port 404 is connected to the negative public DC bus in the public DC bus, the third port 405 is connected to the positive local bus of the branch where the fault protection device 400 is located, and the fourth port 406 is connected to the branch where the fault protection device 400 is located.
- the negative local bus of the circuit is connected; the first diode 401 and the first switching device 402 are connected to the photovoltaic system shown in FIG. 3 through the first port 403, the second port 404, the third port 405, and the fourth port 406. System; and the fifth port 407 is connected to the control terminal of the first switching device 402 on one side, and connected to the control unit 408 on the other side.
- the first diode 401 and the first switching device 402 meet the following functions: when the voltage between the third port 405 and the fourth port 406 is lower than the first port 403 and the second port 403 When the voltage between the ports 404, the first diode 401 conducts forward, and the common DC bus supplies power to the branch; when the voltage between the third port 405 and the fourth port 406 is higher than the first port When the voltage between 403 and the second port 404 and the fifth port 407 receives a driving signal (that is, the current is within the normal range), the first switching device 402 is forward-conducting, and the first diode 401 is reversed When the direction is cut off, the branch supplies power to the common DC bus; when the voltage between the third port 405 and the fourth port 406 is higher than the voltage between the first port 403 and the second port 404, and the fifth port When 407 does not receive a driving signal (that is, the current exceeds the normal range), the first diode 401 is turned off in the reverse direction,
- the fault protection device 400 shown in Figure 4 can realize the bidirectional flow of electric energy between the branch and the public DC bus; when an overcurrent or short circuit occurs in a branch, the other normal branches will exceed their respective currents. In the normal range, it is disconnected from the public DC bus to protect other normal branch equipment; when the public DC bus is over-current or short-circuited, each branch is disconnected from the public DC bus to protect all branch equipment.
- the fault protection device 400 in the embodiment of the present application is described below by taking an IGBT as an example.
- the fault protection device 400 is specifically shown in FIG.
- the device 400 includes: a first diode 401, an IGBT 402, a first port 403, a second port 404, a third port 405, a fourth port 406, a fifth port 407, and a control unit 408; one side of the first port 403 Connected to the positive common DC bus in the common DC bus, the other side of the first port 403 is connected to the anode of the first diode 401 and the emitter of the IGBT 402; one side of the third port 405 is connected to the The fault protection device 400 is connected to the positive local bus of the branch, the other side of the third port 405 is connected to the cathode of the first diode 401 and the collector of the IGBT 402; one side of the second port 404 is
- control unit 408 During operation, if the current of each branch in the photovoltaic system is in the normal range, the control unit 408 sends a drive signal to the fifth port 407; if the current of a branch in the photovoltaic system exceeds the normal range , The control unit 408 stops sending the corresponding driving signal to the branch.
- the control method of the fault protection device 400 is as follows: when the local bus voltage is lower than the common DC bus voltage, the first diode 401 is forward-conducted, at this time, the common DC bus provides electric energy to the local bus; When the voltage of the common DC bus is higher than the common DC bus voltage and the fifth port 407 receives the driving signal sent by the control unit 408, the first diode 401 is turned off in the reverse direction and the IGBT 402 is turned on.
- the local bus is connected to the common The DC bus provides power; when the local bus voltage is higher than the public DC bus voltage, and the fifth port 407 does not receive the drive signal sent by the control unit 408 (that is, the current of the branch exceeds the normal range), the first and second The pole tube 401 is turned off in the reverse direction, and the IGBT 402 is turned off in the forward direction, so that the positive local bus of the branch where the fault protection device 400 is located is disconnected from the positive common DC bus.
- the normal current range may be zero to twice the rated current, or may be other more optimal choices. The specific situation can be determined according to the actual situation and is not limited here.
- Figure 5 above shows an exemplary structure of the fault protection device 400 when the IGBT is used as the first switching device 402 and the first diode 401 is connected between the positive local bus and the positive common DC bus, and the fault protection device 400 can also be connected between the negative local bus and the negative public DC bus, as shown in Figure 6:
- the negative common DC bus in the bus is connected, the other side of the second port 404 is connected to the cathode of the first diode 401 and the collector of the IGBT 402; one side of the fourth port 406 is connected to the fault protection device 400
- the negative local bus of the branch is connected, the other side of the fourth port 406 is connected to the anode of the first diode 401 and the emitter of the IGBT 402; one side of the first port 403 is connected to the common DC bus
- the third port 405 is connected to the positive common DC bus of the branch, the third port 405 is connected to the positive local bus of the branch where the fault protection device 400 is located, and the other side of the first port 403 is connected to the other side of the third port 405
- control unit 408 During operation, if the current of each branch in the photovoltaic system is in the normal range, the control unit 408 sends a drive signal to the fifth port 407; if the current of a branch in the photovoltaic system exceeds the normal range , The control unit 408 stops sending the corresponding driving signal to the branch.
- the control method of the fault protection device 400 is as follows: when the local bus voltage is lower than the common DC bus voltage, the first diode 401 is forward-conducted, at this time, the common DC bus provides electric energy to the local bus; When the voltage of the common DC bus is higher than the common DC bus voltage and the fifth port 407 receives the driving signal sent by the control unit 408, the first diode 401 is turned off in the reverse direction and the IGBT 402 is turned on.
- the local bus is connected to the common The DC bus provides power; when the local bus voltage is higher than the public DC bus voltage, and the fifth port 407 does not receive the drive signal sent by the control unit 408 (that is, the current of the branch exceeds the normal range), the first and second The pole tube 401 is turned off in the reverse direction, and the IGBT 402 is turned off in the positive direction, so that the negative local bus of the branch where the fault protection device 400 is located is disconnected from the negative common DC bus.
- the normal current range may be zero to twice the rated current, or may be other more optimal choices. The specific situation can be determined according to the actual situation and is not limited here.
- the MOSFET when used as a switching device, its specific connection mode and function are similar to those of an IGBT, and will not be repeated here.
- the MOSFET since the MOSFET itself has a body diode, the body diode can be used as the first diode or as a diode in the first diode.
- the fault protection device 400 can also Increasing capacitance.
- the fault protection device 400 may be as shown in FIG. 7:
- the fault protection device 400 further includes a first capacitor 409 and a second capacitor 410;
- the first capacitor 409 is connected in parallel between the first port 403 and the second port 404; the second capacitor 410 is connected in parallel between the third port 405 and the fourth port 406.
- the fault protection device 400 in the embodiment of the present application can be shown in FIG. 7, and capacitors can be added between the local buses and between the common DC bus, or only between the local buses, as shown in Figure 8. As shown; it is also possible to add capacitance only between the common DC bus, as shown in Figure 9. The specific situation is not limited here.
- the fault protection device may also include a structure as shown in FIG.
- the fault protection device 1000 includes: a second diode 1001, a sixth port 1002, a seventh Port 1003, eighth port 1004, and ninth port 1005; wherein, the sixth port 1002 is connected to the positive common DC bus in the common DC bus, and the seventh port 1003 is connected to the negative common DC bus in the common DC bus
- the eighth port 1004 is connected to the positive local bus of the branch where the fault protection device 1000 is located, and the ninth port 1005 is connected to the negative local bus of the branch where the fault protection device 1000 is located; the second diode 1001
- the photovoltaic system shown in FIG. 3 is connected through the sixth port 1002, the seventh port 1003, the eighth port 1004, and the ninth port 1005.
- the second diode 1001 satisfies the following function: when the voltage between the eighth port 1004 and the ninth port 1005 is lower than the voltage between the sixth port 1002 and the seventh port 1003 , The second diode 1001 conducts forward, and the common DC bus supplies power to the branch; and when an overcurrent or short circuit occurs in a branch of the photovoltaic system, the other components of the photovoltaic system include those shown in Figure 10 In the normal branch of the fault protection device 1000, the second diode 1001 will reversely cut off, blocking the branch where the fault protection device 1000 is located from providing current to the common DC bus, thereby protecting the branch where the fault protection device 1000 is located. Branch road equipment.
- the second diode 1001 will reversely cut off , Block the branch where the fault protection device 1000 is located from providing current to the common DC bus, thereby protecting the branch equipment where the fault protection device 1000 is located. That is, the fault protection device 1000 as shown in FIG. 10 can be used for a branch circuit that only provides electric energy from the public DC bus. In this way, it is not necessary to consider the function of the branch to supply power to the public DC bus, and only a diode can be used to achieve current cut-off.
- the specific application branch may be a branch connected to the load unit as shown in FIG. 3, or a branch connected to the power grid and only provides electrical energy to the power grid.
- the specific structure of the fault protection device 1000 may be as shown in FIG. 11 and FIG. 12 respectively.
- the second diode 1001 is connected between the positive common DC bus and the positive local bus, one side of the sixth port 1002 is connected to the positive common DC bus, and the other of the sixth port 1002 Side is connected to the anode of the second diode 1001; one side of the eighth port 1004 is connected to the positive local bus, and the other side of the eighth port 1004 is connected to the cathode of the second diode 1001; the One side of the seventh port 1003 is connected to the negative common DC bus, one side of the ninth port 1005 is connected to the negative local bus, and the other side of the seventh port 1003 is connected to the other side of the ninth port 1005 , That is, the negative local bus is directly connected to the negative public DC bus.
- the second diode 1001 is connected between the negative common DC bus and the negative local bus, one side of the seventh port 1003 is connected to the negative common DC bus, and the other side is connected to the second second The cathode of the pole tube 1001 is connected; one side of the ninth port 1005 is connected to the negative local bus, and the other side is connected to the anode of the second diode 1001; one side of the sixth port 1002 is connected to the positive common direct current Bus connection, one side of the eighth port 1004 is connected to the positive local bus, the other side of the sixth port 1002 is connected to the other side of the eighth port 1004, that is, the positive common DC bus is directly connected to the positive local bus .
- the fault protection device 1000 can also Increasing capacitance.
- the fault protection device 1000 may be as shown in FIG. 13:
- the fault protection device 1000 further includes a third capacitor 1006 and a fourth capacitor 1007;
- the third capacitor 1006 is connected in parallel between the sixth port 1002 and the seventh port 1003; the fourth capacitor 1007 is connected in parallel between the eighth port 1004 and the ninth port 1005.
- the fault protection device 1000 in the embodiment of the present application can be shown in FIG. 13, and capacitors can be added between the local buses and between the public DC buses, or only the buses can be added between the local buses, as shown in Figure 14. As shown; it is also possible to add capacitance only between the common DC bus, as shown in Figure 15. The specific situation is not limited here.
- the diode in the fault protection device shown in any one of FIGS. 4 to 15, may include multiple diodes, and the multiple diodes are combined in parallel. If the fault protection device includes a switching device, the switching device may also include multiple switching devices, and the multiple switching devices are combined in parallel. As shown in FIG. 16, taking the first diode and the first switching device as an IGBT as an example for description, multiple IGBTs are connected in parallel to form the first switching device 402, and multiple diodes are connected in parallel to form the first diode 401.
- the photovoltaic system shown in FIG. 3 includes the fault protection device shown in any one of FIGS. 4 to 9 and FIG. 16, or the photovoltaic system shown in FIG.
- the fault protection device shown in any one of FIG. 10 to FIG. 15 is only applied to the branch circuit whose working condition is that the common DC bus provides power to the branch circuit.
- the disclosed system, device, and method may be implemented in other ways.
- the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
- the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
- the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
- the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
- the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
- the technical solution of the present application essentially or the part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
- the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .
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Abstract
Description
Claims (24)
- 一种故障保护装置,应用于基于公共直流母线的光伏系统,其特征在于,包括:第一二极管、第一开关器件、控制单元、第一端口、第二端口、第三端口、第四端口以及第五端口;所述第一端口与所述公共直流母线中的正公共直流母线相连,所述第二端口与所述公共直流母线中的负公共直流母线相连,所述第三端口与所述故障保护装置所处支路的正本地母线相连,所述第四端口与所述故障保护装置所处支路的负本地母线相连,所述第五端口一侧与所述第一开关器件的控制端相连;所述第一二极管和所述第一开关器件通过所述第一端口、所述第二端口、所述第三端口以及所述第四端口接入所述电力系统;所述第五端口的另一侧与所述控制单元相连,所述控制单元发送驱动信号控制所述第一开关器件;当所述第三端口和所述第四端口之间的电压低于所述第一端口和所述第二端口之间的电压时,所述第一二极管正向导通;当所述第三端口和所述第四端口之间的电压高于所述第一端口和所述第二端口之间的电压,且所述第五端口接收到所述驱动信号时,所述第一开关器件正向导通;当所述第三端口和所述第四端口之间的电压高于所述第一端口和所述第二端口之间的电压,且所述第五端口未接收到所述驱动信号时,所述第一二极管反向截止,所述第一开关器件正向截止。
- 根据权利要求1所述的装置,其特征在于,所述第一二极管包括多个二极管,且所述多个二极管并联;所述第一开关器件包括多个开关器件,且所述多个开关器件并联。
- 根据权利要求1或2所述的装置,其特征在于,所述第一开关器件为绝缘栅双极型晶体管IGBT或金属氧化物半导体场效应晶体管MOSFET。
- 根据权利要求3所述的装置,其特征在于,在所述第一开关器件为MOSFET时,所述MOSFET中的体二极管为所述第一二极管;或者,所述体二极管为所述第一二极管中的一个二极管。
- 根据权利要求3或4中任一项所述的装置,其特征在于,所述第一二极管的阳极连接所述第一端口,所述第一二极管的阴极连接所述第三端口,所述IGBT的发射极或所述MOSFET的源极连接所述第一端口,所述IGBT的集电极或所述MOSFET的漏极连接所述第三端口,所述第二端口与所述第四端口相连;或者,所述第一二极管的阴极连接所述第二端口,所述第一二极管的阳极连接所述第四端口,所述IGBT的集电极或所述MOSFET的漏极连接所述第二端口,所述IGBT的发射极或所述MOSFET的源极连接所述第四端口,所述第一端口与所述第三端口相连。
- 根据权利要求1至5中任一项所述装置,其特征在于,所述第一端口和所述第二端口之间并联第一电容;或者,所述第三端口和所述第四端口之间并联第二电容;或者,所述第一端口和所述第二端口之间并联第一电容,且所述第三端口和所述第四端口之间并联第二电容。
- 一种故障保护装置,应用于基于公共直流母线的光伏系统,其特征在于,包括:第二二极管,第六端口、第七端口、第八端口以及第九端口;其中,所述第六端口与所述公共直流母线中的正公共直流母线相连,所述第七端口与所述公共直流母线中的负公共直流母线相连,所述第八端口与所述故障保护装置所处支路的正本地母线相连,所述第九端口与所述故障保护装置所处支路的负本地母线相连;所述第二二极管通过所述第六端口、所述第七端口、所述第八端口以及所述第九端口接入所述电力系统;当所述第八端口和所述第九端口之间的电压低于所述第六端口和所述第七端口之间的电压时,所述第二二极管正向导通;当所述第八端口和所述第九端口之间的电压高于所述第六端口和所述第七端口之间的电压时,所述第二二极管反向截止。
- 根据权利要求7所述的装置,其特征在于,所述第二二极管包括多个二极管,且所述多个二极管并联。
- 根据权利要求7或8中任一项所述的装置,其特征在于,所述第二二极管的阳极与所述第六端口相连,所述第二二极管的阴极与所述第八端口相连,所述第七端口与所述第九端口相连;或者,所述第二二极管的阴极与所述第七端口相连,所述第二二极管的阳极与所述第九端口相连,所述第六端口与所述第八端口相连。
- 根据权利要求7至9中任一项所述的装置,其特征在于,所述第六端口和所述第七端口之间并联第三电容;或者,所述第八端口和所述第九端口之间并联第四电容;或者,所述第六端口和所述第七端口之间并联第三电容,且所述第八端口和所述第九端口之间并联第四电容。
- 一种光伏系统,其特征在于,包括:公共直流母线、多个第一故障保护装置、多个第一直流源单元以及多个第一逆变单元;所述第一直流源单元或所述第一逆变单元所处支路通过所述第一故障保护装置与所述公共直流母线相连;所述第一故障保护装置包括第一二极管、第一开关器件和控制单元;当所述第一二极管正向导通时,所述公共直流母线向支路供电;所述控制单元控制所述第一开关器件正向导通时,支路向所述公共直流母线供能;所述第一二极管反向截止,且所述控制单元控制所述第一开关器件正向截止时,支路与所述公共直流母线断开。
- 根据权利要求11所述的系统,其特征在于,所述第一二极管包括多个二极管,且所述多个二极管并联;所述第一开关器件包括多个开关器件,且所述多个开关器件并联。
- 根据权利要求11或12所述的系统,其特征在于,所述第一开关器件为绝缘栅双极型晶体管IGBT或金属氧化物半导体场效应晶体管MOSFET。
- 根据权利要求13所述的系统,其特征在于,在所述第一开关器件为MOSFET时,所述MOSFET中的体二极管为所述第一二极管;或者,所述体二极管为所述第一二极管中的一个二极管。
- 根据权利要求11至14所述的系统,其特征在于,所述第一故障保护装置连接在所述第一直流源单元或所述第一逆变单元所处支路的正本地母线与所述公共直流母线的正公共直流母线之间;或,所述第一故障保护装置连接在所述第一直流源单元或所述第一逆变单元所处支路的负本地母线与所述公共直流母线的负公共直流母线之间。
- 根据权利要求15所述的系统,其特征在于,所述第一故障保护装置还包括第一端口、第二端口、第三端口、第四端口以及第五端口;其中,所述第一端口的一侧与所述公共直流母线中的正公共直流母线相连,所述第二端口与所述公共直流母线中的负公共直流母线相连,所述第三端口的一侧与所述故障保护装置所处支路的正本地母线相连,所述第四端口与所述故障保护装置所处支路的负本地母线相连,所述第五端口的一侧与所述第一开关器件的控制端相连,所述第五端口的另一侧与所述控制单元相连;在所述第一开关器件为绝缘栅双极型晶体管IGBT或金属氧化物半导体场效应晶体管MOSFET时,所述第一二极管的阳极连接所述第一端口,所述第一二极管的阴极连接所述第三端口,所述IGBT的发射极或所述MOSFET的源极连接所述第一端口,所述IGBT的集电极或所述MOSFET的漏极连接所述第三端口,所述第二端口与所述第四端口相连;或者,在所述第一开关器件为绝缘栅双极型晶体管IGBT或金属氧化物半导体场效应晶体管MOSFET时,所述第一二极管的阴极连接所述第二端口,所述第一二极管的阳极连接所述第四端口,所述IGBT的集电极或所述MOSFET的漏极连接所述第二端口,所述IGBT的发射极或所述MOSFET的源极连接所述第四端口,所述第一端口与所述第三端口相连。
- 根据权利要求11至16中任一项所述的系统,其特征在于,所述系统还包括多个第二故障保护装置,多个第二直流源单元,多个第二逆变单元,所述第二故障保护装置包括第二二极管;所述第二直流源单元所处支路或所述第二逆变单元所处支路通过所述第二故障保护装置与所述公共直流母线相连;当所述第二二极管正向导通时,所述公共直流母线向支路供电;当所述第二二极管反向截止时,所述第二二极管所处支路与所述公共直流母线断开。
- 根据权利要求17所述的系统,其特征在于,所述第二二极管包括多个二极管,且 所述多个二极管并联。
- 根据权利要求16或17所述的系统,其特征在于,所述第二故障保护装置连接在所述第二直流源单元或所述第二逆变单元所处支路的正本地母线与所述公共直流母线的正公共直流母线之间;或,所述第二故障保护装置连接在所述第二直流源单元或所述第二逆变单元所处支路的负本地母线与所述公共直流母线的负公共直流母线之间。
- 根据权利要求19所述的系统,其特征在于,所述第二故障保护装置还包括第六端口、第七端口、第八端口以及第九端口;其中所述第六端口与所述公共直流母线中的正公共直流母线相连,所述第七端口与所述公共直流母线中的负公共直流母线相连,所述第八端口与所述第二故障保护装置所处支路的正本地母线相连,所述第九端口与所述第二故障保护装置所处支路的负本地母线相连;所述第二二极管的阳极与所述第六端口相连,所述第二二极管的阴极与所述第八端口相连,所述第七端口与所述第九端口相连;或者,所述第二二极管的阴极与所述第七端口相连,所述第二二极管的阳极与所述第九端口相连,所述第六端口与所述第八端口相连。
- 根据权利要求11至20中任一项所述的系统,其特征在于,所述第一故障保护装置所处支路连接的正公共直流母线与负公共直流母线之间并联第一电容;或者,所述第一故障保护装置所处支路的正本地直流母线与负本地直流母线之间并联第二电容;或者,所述第一故障保护装置所处支路连接的正公共直流母线与负公共直流母线之间并联第一电容,且所述第一故障保护装置所处支路的正本地直流母线与负本地直流母线之间并联第二电容。
- 根据权利要求17至21中任一项所述的系统,其特征在于,所述第二故障保护装置所处支路连接的正公共直流母线与负公共直流母线之间并联第三电容;或者,所述第二故障保护装置所处支路的正本地直流母线与负本地直流母线之间并联第四电容;或者,所述第二故障保护装置所处支路连接的正公共直流母线与负公共直流母线之间并联第三电容,且所述第二故障保护装置所处支路的正本地直流母线与负本地直流母线之间并联第四电容。
- 根据权利要求11至22中任一项所述的系统,其特征在于,所述直流源单元包括直流变换单元和储能单元;或,所述直流源单元包括直流变换单元和负载单元;或,所述直流源单元包括储能单元或负载单元;所述系统还包括电网;所述第一逆变单元的另一侧连接所述电网。
- 根据权利要求17至23中任一项所述的系统,其特征在于,所述第二直流源单元包括直流变换单元和负载单元;或,所述第二直流源单元包括负载单元;所述系统还包括电网;所述第二逆变单元的另一侧连接所述电网。
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