WO2024183428A1 - 一种储能系统及其漏电故障定位方法 - Google Patents

一种储能系统及其漏电故障定位方法 Download PDF

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Publication number
WO2024183428A1
WO2024183428A1 PCT/CN2023/142962 CN2023142962W WO2024183428A1 WO 2024183428 A1 WO2024183428 A1 WO 2024183428A1 CN 2023142962 W CN2023142962 W CN 2023142962W WO 2024183428 A1 WO2024183428 A1 WO 2024183428A1
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WO
WIPO (PCT)
Prior art keywords
switch unit
battery cluster
energy storage
storage system
power conversion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/142962
Other languages
English (en)
French (fr)
Inventor
盛任
吴伊宏
李开颜
陈保国
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Huawei Digital Power Technologies Co Ltd
Original Assignee
Huawei Digital Power Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Digital Power Technologies Co Ltd filed Critical Huawei Digital Power Technologies Co Ltd
Priority to EP23926122.5A priority Critical patent/EP4614757A4/en
Publication of WO2024183428A1 publication Critical patent/WO2024183428A1/zh
Priority to US19/247,660 priority patent/US20250323494A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3646—Constructional arrangements for indicating electrical conditions or variables, e.g. visual or audible indicators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • 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
    • 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
    • H02H3/26—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/33—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 difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors using summation current transformers
    • 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
    • H02H7/18—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 batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote monitoring or remote control of equipment in a power distribution network
    • H02J13/12—Monitoring network conditions, e.g. electrical magnitudes or operational status
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/70—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries characterised by the mechanical construction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of energy storage technology, and in particular to an energy storage system and a leakage fault locating method thereof.
  • the energy storage system Due to leakage faults in the battery cluster, cables or functional module circuits in the energy storage system, the energy storage system has a large leakage current to the ground, causing safety accidents. Therefore, in the existing energy storage system, if there is a leakage fault somewhere in the energy storage system, the energy storage system will generate a protection action, that is, disconnect the connection between the power module circuits in the energy storage system. Then the leakage fault of the energy storage system is manually checked, which brings certain difficulties to the system maintenance.
  • the present application provides an energy storage system and a leakage fault locating method thereof, which can determine the location of the leakage fault in the energy storage system and facilitate system maintenance.
  • the present application provides an energy storage system, which includes a battery cluster, a battery cluster control circuit, a first power conversion circuit, a first detection circuit, and a controller.
  • the specific connection relationship of the energy storage system is: the battery cluster is connected to one end of the battery cluster control circuit, the other end of the battery cluster control circuit is connected to one end of the first power conversion circuit, the other end of the first power conversion circuit is used to connect to the power grid or load, and the first detection circuit is arranged between the first power conversion circuit and the power grid or load.
  • the controller when the first detection circuit detects that the leakage current of the energy storage system is greater than a preset safety threshold, the controller controls the battery cluster control circuit and the first power conversion circuit to shut down; and after controlling the battery cluster control circuit and the first power conversion circuit to shut down, the controller controls the battery cluster control circuit to turn on, and based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, sends an alarm message of a leakage fault in the battery cluster.
  • the controller disconnects the battery cluster control circuit from the first power conversion circuit, and then further turns on the battery cluster control circuit, and detects the leakage current of the energy storage system, so that the battery cluster can be found to cause the leakage fault in the energy storage system. That is, if it is determined that a leakage fault occurs in the battery cluster in the energy storage system, the battery cluster can be directly repaired or replaced, which is convenient for the maintenance of the energy storage system and has high maintenance efficiency.
  • the first power conversion circuit includes a first connection switch unit, and the first connection switch unit is used to connect to the battery cluster control circuit.
  • the controller controls the first connection switch unit to be turned on; at this time, when the first connection switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, the controller sends an alarm message that a leakage fault has occurred in the circuit between the battery cluster control circuit and the first power conversion circuit.
  • the first power conversion circuit also includes a first power switch unit, and the first power switch unit is arranged between the first connection switch unit and the first detection circuit.
  • the controller controls the first power switch unit to be turned on; at this time, when the first power switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, the controller sends an alarm message that a leakage fault has occurred in the first power conversion circuit.
  • the first power conversion circuit also includes a second connecting switch unit, and the second connecting switch unit is arranged between the first power switch unit and the first detection circuit.
  • the controller controls the second connection switch unit to be turned on; and when the second connection switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, the controller sends a loop signal between the first power conversion circuit and the power grid or the load. Warning message of leakage fault.
  • the energy storage system also includes a second power conversion circuit, which is arranged between the battery cluster control circuit and the first connecting switch unit; wherein the power conversion circuit includes a second power switch unit, and the second power switch unit is used to convert the input voltage or output voltage of the battery cluster.
  • the controller controls the second power switch unit to be turned on before controlling the first connection switch unit to be turned on; at this time, when the second power switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, the controller sends an alarm message that a leakage fault has occurred in the battery cluster control circuit.
  • the second power conversion circuit further includes a third connecting switch unit, and the third connecting switch unit is used to connect the first connecting switch unit.
  • the controller controls the third connection switch unit to be turned on; and, when the third connection switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, the controller sends an alarm message that a leakage fault has occurred in the second power conversion circuit.
  • the energy storage system further includes a second detection circuit, and the second detection circuit is disposed between the battery cluster and the battery cluster control circuit.
  • the controller sends an alarm message indicating that the battery cluster has a leakage fault.
  • the implementation of the present application embodiment can provide a dual judgment of leakage faults for the battery cluster, which is safe.
  • the controller updates the preset safety threshold based on the leakage current of the battery cluster detected by the second detection circuit.
  • an embodiment of the present application provides a method for locating a leakage fault of an energy storage system, wherein the energy storage system includes a battery cluster, a battery cluster control circuit, a first power conversion circuit and a first detection circuit, and the specific connection relationship of the energy storage system is: the battery cluster is connected to one end of the battery cluster control circuit, the other end of the battery cluster control circuit is connected to one end of the first power conversion circuit, and the other end of the first power conversion circuit is used to connect to a power grid or a load; the first detection circuit is arranged between the first power conversion circuit and the power grid or the load.
  • the leakage fault locating method is specifically implemented as follows: when the first detection circuit detects that the leakage current of the energy storage system is greater than a preset safety threshold, the battery cluster control circuit and the first power conversion circuit are controlled to be turned off; after the battery cluster control circuit and the first power conversion circuit are controlled to be turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, an alarm message of a leakage fault in the battery cluster is sent.
  • the first power conversion circuit includes a first connection switch unit, and the first connection switch unit is used to connect to the battery cluster control circuit.
  • the leakage fault location method also includes:
  • the first connection switch unit When the battery cluster control circuit is controlled to be turned on, if the first detection circuit detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, the first connection switch unit is controlled to be turned on; when the first connection switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, an alarm message of a leakage fault occurring in the circuit between the battery cluster and the first power conversion circuit is sent.
  • the first power conversion circuit further includes a first power switch unit, and the first power switch unit is arranged between the first connection switch unit and the first detection circuit;
  • the leakage fault location method also includes:
  • the first connection switch unit When the first connection switch unit is turned on, if the first detection circuit detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, the first power switch unit is controlled to be turned on; when the first power switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, an alarm message of a leakage fault in the first power conversion circuit is sent.
  • the first power conversion circuit further includes a second connection switch unit, and the second connection switch unit is provided between the first power switch unit and the first detection circuit;
  • the leakage fault location method also includes:
  • the second connection switch unit When the first power switch unit is turned on, if the first detection circuit detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, the second connection switch unit is controlled to be turned on; when the second connection switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, an alarm message of a leakage fault in the circuit between the first power conversion circuit and the power grid or the load is sent.
  • the energy storage system further includes a second power conversion circuit, and the second power conversion circuit is provided between the battery cluster control circuit and the first connection switch unit.
  • the power conversion circuit further comprises a second power switch unit, the second power switch unit is used to convert the input voltage or output voltage of the battery cluster;
  • the leakage fault location method also includes:
  • the second power switch unit When the battery cluster control circuit is turned on, if the first detection circuit detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, the second power switch unit is controlled to be turned on before the first connection switch unit is controlled to be turned on; when the second power switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, an alarm message of a leakage fault in the battery cluster control circuit is sent.
  • the second power conversion circuit further includes a third connection switch unit, and the third connection switch unit is used to connect the first connection switch unit;
  • the leakage fault location method also includes:
  • the third connection switch unit When the second power switch unit is turned on, if the first detection circuit detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, the third connection switch unit is controlled to be turned on; when the third connection switch unit is turned on, based on the first detection circuit detecting that the leakage current of the energy storage system is greater than the preset safety threshold, an alarm message of a leakage fault in the second power conversion circuit is sent.
  • the energy storage system further includes a second detection circuit, and the second detection circuit is disposed between the battery cluster and the battery cluster control circuit;
  • the leakage fault location method also includes:
  • the leakage fault locating method further includes:
  • the preset safety threshold is updated based on the leakage current of the battery cluster detected by the second detection circuit.
  • FIG1 is a structural block diagram of an energy storage system provided in an embodiment of the present application.
  • FIG2 is a schematic diagram of a flow chart of a method for locating a leakage fault of an energy storage system provided in an embodiment of the present application
  • FIG3 is a structural block diagram of a first power conversion circuit provided in an embodiment of the present application.
  • FIG4 is another schematic diagram of a flow chart of a method for locating a leakage fault of an energy storage system provided in an embodiment of the present application;
  • FIG5 is another structural block diagram of an energy storage system provided in an embodiment of the present application.
  • FIG6 is another structural block diagram of an energy storage system provided in an embodiment of the present application.
  • FIG7 is a structural block diagram of a second power conversion circuit provided in an embodiment of the present application.
  • FIG8 is another schematic flow chart of a method for locating leakage faults in an energy storage system provided in an embodiment of the present application.
  • Fig. 1 is a structural block diagram of an energy storage system provided in an embodiment of the present application.
  • the energy storage system includes a battery cluster 100 , a battery cluster control circuit 101 , a first power conversion circuit 102 , a first detection circuit 103 and a controller 104 .
  • the battery cluster 100 is connected to one end of the battery cluster control circuit 101.
  • the battery cluster 100 may include a battery pack, or include multiple battery packs having a series, parallel or series-parallel connection relationship.
  • the battery cluster control circuit 101 can manage the battery cluster 100, and can generally be set in the high-voltage control box of the battery cluster 100.
  • the battery cluster control circuit 101 can collect the voltage and current of the battery cluster 100, summarize the voltage and temperature information of each battery pack in the battery cluster 100, calculate the charge state of the battery cluster 100, etc.
  • the battery cluster control circuit 101 can have a CAN communication interface to realize data communication function with other functional circuits.
  • the battery cluster control circuit 101 can also have an RS-485 communication interface or an Ethernet communication interface to realize communication with external devices. It should be noted that the specific implementation method of the battery cluster control circuit 101 can refer to the prior art, and the embodiment of the present application does not limit the battery cluster control circuit 101.
  • the other end of the battery cluster control circuit 101 is connected to one end of the first power conversion circuit 102, and the other end of the first power conversion circuit 102 can be connected to the power grid or the load.
  • the specific implementation of the first power conversion circuit 102 can be adjusted according to the device connected to the other end of the first power conversion circuit 102.
  • the first power conversion circuit 102 can be implemented as a DC/AC converter, in which case the first power conversion circuit 102 can convert the direct current output by the battery cluster 100 into alternating current and incorporate it into the power grid; or the first power conversion circuit 102 can be implemented as a PCS, in which case the first power conversion circuit 102 can convert the direct current output by the battery cluster 100 into alternating current and incorporate it into the power grid, and can further convert the alternating current provided by the power grid into direct current to charge the battery cluster 100.
  • DC/AC converter in which case the first power conversion circuit 102 can convert the direct current output by the battery cluster 100 into alternating current and incorporate it into the power grid
  • PCS in which case the first power conversion circuit 102 can convert the direct current output by the battery cluster 100 into alternating current and incorporate it into the power grid, and can further convert the alternating current provided by the power grid into direct current to charge the battery cluster 100.
  • the first power conversion circuit 102 can be implemented as a DC/DC converter, which can convert the direct current output by the battery cluster 100 and then provide it to the DC load.
  • the first detection circuit 103 is provided between the first power conversion circuit 102 and the power grid/load.
  • the first detection circuit 103 is a leakage current protection device in the energy storage system, which can be specifically implemented as a residual current device (RCD).
  • RCD residual current device
  • the controller 104 is connected to the battery cluster control circuit 101, the first power conversion circuit 102 and the first detection circuit 103.
  • the controller 104 can be specifically implemented as a micro control unit (MCU), a central processing unit (CPU), other general processors, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc.
  • MCU micro control unit
  • CPU central processing unit
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • the energy storage system also includes a Y capacitor, which is a capacitor respectively connected between two power lines and the ground, and generally appears in pairs, such as capacitor C11 and capacitor C12 shown in Figure 1.
  • the leakage current in the energy storage system specifically refers to the current between the two power lines and the ground.
  • a power line forms a loop to the ground through capacitor C11
  • the ground of the energy storage system is connected to the ground through the casing of the cabinet.
  • another power line can also form a loop to the ground through capacitor C12 . Therefore, the leakage current of the energy storage system to the ground can be considered as the current between the power line and the casing.
  • the energy storage system may include multiple pairs of Y capacitors, such as capacitor C13 and capacitor C14 shown in Figure 1.
  • the controller 104 may execute the leakage fault location method shown in FIG2 to locate the leakage fault of the energy storage system.
  • the specific execution steps are as follows:
  • the controller 104 may control the battery cluster control circuit 101 and the first power conversion circuit 102 to shut down when the first detection circuit 103 detects that the leakage current of the energy storage system is greater than a preset safety threshold.
  • the first detection circuit 103 can use a current transformer to detect the current phasor sum between the two power lines, so as to obtain the leakage current of the energy storage system. At this time, the current transformer in the first detection circuit 103 is across the two power lines.
  • the specific implementation principle can refer to the existing RCD, which will not be repeated here.
  • the controller 104 determines that a leakage fault occurs in the energy storage system and protects the energy storage system by controlling the battery cluster control circuit 101 and the first power conversion circuit 102 to shut down.
  • the size of the preset safety threshold can be preset, and the preset safety threshold is related to the number of levels set in the energy storage system and the leakage current existing when the energy storage system is operating normally.
  • the number of levels set in the energy storage system can be understood as: the battery cluster 100 is a level, the battery cluster control circuit 101 is a level, and the first power conversion circuit 102 is a level.
  • the number of levels of the energy storage system shown in Figure 1 is 3. Assume that the inventor of the present application knows through measurement and observation that the leakage current existing in the normal operation of the energy storage system is 0.5A, or the inventor of the present application knows through theoretical calculation that the leakage current existing in the normal operation of the energy storage system is 0.5A.
  • the inventor of the present application sets an amplification factor according to the number of levels of the energy storage system in research and practice, for example, the amplification factor corresponding to the number of levels 3 is 5.
  • the controller 104 stores the leakage current existing in the normal operation of the energy storage system and the amplification factor corresponding to the number of levels of the energy storage system.
  • the controller 104 multiplies the leakage current existing in the normal operation of the energy storage system by the amplification factor, which is the preset safety threshold.
  • the levels of the energy storage systems and the leakage currents existing during normal operation of the energy storage systems are different, and the size of the preset safety threshold may be different.
  • the controller 104 determines whether the leakage current of the energy storage system detected by the first detection circuit 103 is greater than the preset safety threshold. At this time, the battery cluster control circuit 101 is turned on. If the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 104 executes step S204a, otherwise the controller 104 executes step S204b.
  • the controller 104 sends an alarm message that the battery cluster 100 has a leakage fault.
  • the battery cluster control circuit 101 is in the on state, and the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold. It can be considered that the leakage current of the energy storage system is caused by the battery cluster 100.
  • the controller 104 determines that the battery cluster 100 has a leakage fault, and sends an alarm message that the battery cluster 100 has a leakage fault.
  • a display device is provided in the energy storage system, and the controller 104 sends an alarm message that the battery cluster 100 has a leakage fault to the display device.
  • the controller 104 sends 1 to the display device, and 1 represents that the battery cluster 100 has a leakage fault. Further, the display device Display 1 indicates that a leakage fault occurs in the battery cluster 100. Alternatively, the controller 104 may send an alarm message indicating that a leakage fault occurs in the battery cluster 100 to a cloud server for managing multiple energy storage systems. In this case, the cloud server may mark and process the leakage fault of the battery cluster 100.
  • the controller disconnects the battery cluster control circuit from the first power conversion circuit, and then further turns on the battery cluster control circuit, and detects the leakage current of the energy storage system, so as to find out that the battery cluster causes the leakage fault in the energy storage system, that is, it is determined that the battery cluster in the energy storage system has a leakage fault, and sends an alarm message that the battery cluster has a leakage fault, so that maintenance personnel can directly locate the location where the energy storage system fails, and repair or replace the battery cluster, which is convenient for the maintenance of the energy storage system and has high maintenance efficiency.
  • the controller 104 controls the first connection switch unit to be turned on.
  • the battery cluster control circuit 101 is in the on state, and the first detection circuit 103 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, then it can be considered that the battery cluster 100 has no leakage fault, and the controller 104 further controls the first connection switch unit to be turned on.
  • the first connection switch unit is a part of the first power conversion circuit 102.
  • the structure of the first power conversion circuit 102 is shown in FIG3, that is, the first power conversion circuit 102 includes a first connection switch unit 1021, a first power switch unit 1022, and a second connection switch unit 1023.
  • the first connection switch unit 1021 is connected to the battery cluster control circuit 101
  • the first power switch unit 1022 is arranged between the first connection switch unit 1021 and the first detection circuit 103
  • the second connection switch unit 1023 is arranged between the first power switch unit 1022 and the first detection circuit 103.
  • one end of the first connection switch unit 1021 is connected to the battery cluster control circuit 101, the other end of the first connection switch unit 1021 is connected to one end of the first power switch unit 1022, the other end of the first power switch unit 1022 is connected to one end of the second connection switch unit 1023, and the other end of the second connection switch unit 1023 is connected to the load or the power grid.
  • At least one of the first connection switch unit 1021, the first power switch unit 1022, and the second connection switch unit 1023 may be specifically implemented as a solid-state switch, such as a contactor or a relay, etc.
  • at least one of the first connection switch unit 1021, the first power switch unit 1022, and the second connection switch unit 1023 may be specifically implemented as a semiconductor switch, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or an Insulated Gate Bipolar Transistor (IGBT).
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • IGBT Insulated Gate Bipolar Transistor
  • step S201 the controller 104 controls the first power conversion circuit 102 to be turned off, that is, controls the first connection switch unit 1021, the first power switch unit 1022, and the second connection switch unit 1023 to be turned off, that is, disconnects the closing point 1, the closing point 2, and the closing point 3. It can be understood that the closing point 1, the closing point 2, and the closing point 3 can be considered as the place where the switch unit can be controlled by the controller 104.
  • the controller 104 disconnects the closing point 1, that is, disconnects the connection between the first connection switch unit 1021 and the battery cluster control circuit 101 and the first power conversion circuit 1022; the controller 104 disconnects the closing point 2, that is, disconnects the connection between the first power switch unit 1022 and the first connection switch unit 1021 and the second connection switch unit 1023; the controller 104 disconnects the closing point 3, that is, disconnects the connection between the second connection switch unit 1023 and the first power switch unit 1022 and the power grid or the load.
  • step S202 when the first detection circuit 103 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, the controller 104 controls the first connection switch unit 1021 to be turned on, that is, controls the closing point 1 to be closed, and connects the first connection switch unit 1021 to the battery cluster control circuit 101. At this time, the first power switch unit 1022 and the second connection switch unit 1023 are still in the off state.
  • the controller may continue to execute the leakage fault location method shown in FIG4 , wherein the specific execution steps are as follows:
  • step S205 When the first connection switch unit 1021 is turned on, the controller 104 determines whether the leakage current of the energy storage system detected by the first detection circuit 103 is greater than the preset safety threshold. At this time, the battery cluster control circuit 101 and the first connection switch unit 1021 are in a conducting state. If the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 104 executes step S206a, otherwise the controller 104 executes step S206b.
  • the controller 104 sends an alarm message that a leakage fault occurs in the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102.
  • the controller 104 since the controller 104 further controls the first connection switch unit 1021 to be turned on after executing step S204b, that is, the controller 104 excludes the possibility of a leakage fault in the battery cluster 100, and further controls the first connection switch unit 1021 to be turned on, at this time, the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, then it can be considered that the leakage current of the energy storage system is caused by the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102, that is, it is determined that a leakage fault occurs in the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102.
  • the leakage fault in the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102 may be a leakage fault in the cable connecting the battery cluster control circuit 101 and the first power conversion circuit 102, or a leakage fault in the contactor or relay between the battery cluster control circuit 101 and the first power conversion circuit 102, etc.
  • the controller 104 determines that a leakage fault occurs in the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102, it sends an alarm message that a leakage fault occurs in the circuit between the battery cluster control circuit and the first power conversion circuit.
  • the alarm information of leakage fault in the loop between the cluster control circuit and the first power conversion circuit for example, the controller 104 sends 2 to the display device, 2 represents leakage fault in the loop between the battery cluster control circuit 101 and the first power conversion circuit 102.
  • the controller 104 can send the alarm information of leakage fault in the loop between the battery cluster control circuit and the first power conversion circuit to the cloud server, and the cloud server can mark and process the leakage fault in the loop between the battery cluster control circuit and the first power conversion circuit.
  • the controller 104 controls the first power switch unit 1022 to be turned on.
  • the battery cluster control circuit 101 and the first connection switch unit 1021 are in the on state, and the first detection circuit 103 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, then it can be considered that the loop between the battery cluster 100 and the battery cluster control circuit 101 and the first power conversion circuit 102 has no leakage fault, and the controller 104 further controls the first power switch unit 1022 to be turned on.
  • the controller 104 determines whether the leakage current of the energy storage system detected by the first detection circuit 103 is greater than the preset safety threshold. At this time, the battery cluster control circuit 101, the first connection switch unit 1021 and the first power switch unit 1022 are in the on state. If the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 104 executes step S208a, otherwise the controller 104 executes step S208b.
  • the controller 104 sends an alarm message that the first power conversion circuit 102 has a leakage fault.
  • the controller 104 since the controller 104 is after executing step S206b, that is, the controller 104 has ruled out the possibility of a leakage fault in the battery cluster 100 and the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102, and further controls the first power switch unit 1022 to be turned on, at this time, the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, then it can be considered that the leakage current of the energy storage system is caused by the first power conversion circuit 102, and the controller 104 determines that the first power conversion circuit 102 has a leakage fault, and sends an alarm message that the first power conversion circuit has a leakage fault.
  • the controller 104 sends an alarm message that the first power conversion circuit has a leakage fault to the display device, for example, the controller 104 sends 3 to the display device, and 3 represents that the first power conversion circuit has a leakage fault.
  • the controller 104 may send an alarm message indicating that a leakage fault has occurred in the first power conversion circuit to a cloud server, and the cloud server may mark and process the leakage fault in the first power conversion circuit.
  • the controller 104 controls the second connection switch unit 1023 to be turned on.
  • the battery cluster control circuit 101, the first connection switch unit 1021 and the first power switch unit 1022 are in the on state, and the first detection circuit 103 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, then it can be considered that the battery cluster 100, the loop between the battery cluster control circuit 101 and the first power conversion circuit 102, and the first power conversion circuit 102 have no leakage fault, and the controller 104 further controls the second connection switch unit 1023 to be turned on.
  • the controller 104 determines whether the leakage current of the energy storage system detected by the first detection circuit 103 is greater than the preset safety threshold. At this time, the battery cluster control circuit 101, the first connection switch unit 1021, the first power switch unit 1022 and the second connection switch unit 1023 are in the on state. If the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 104 executes step S210a, otherwise the controller 104 executes step S210b.
  • the controller 104 sends an alarm message that a leakage fault occurs in the circuit between the first power conversion circuit 102 and the power grid or the load.
  • the controller 104 since the controller 104 is after executing step S208b, that is, the controller 104 excludes the possibility of leakage faults in the battery cluster 100, the circuit between the battery cluster control circuit 101 and the first power conversion circuit 102, and the first power conversion circuit 102, and further controls the second connection switch unit 1023 to be turned on, at this time, the first detection circuit 103 detects that the leakage current of the energy storage system is greater than the preset safety threshold, then it can be considered that the leakage current of the energy storage system is caused by the circuit between the first power conversion circuit 102 and the power grid or the load, that is, it is determined that a leakage fault occurs in the circuit between the first power conversion circuit 102 and the power grid or the load.
  • the leakage fault in the circuit between the first power conversion circuit 102 and the power grid or the load may be caused by a fault in the cable connecting the first power conversion circuit 102 and the power grid or the load, or by a leakage fault in the contactor or relay between the first power conversion circuit 102 and the power grid or the load.
  • the controller 104 determines that a leakage fault occurs in the circuit between the first power conversion circuit 102 and the power grid or the load
  • the controller 104 sends an alarm message that a leakage fault occurs in the circuit between the first power conversion circuit and the power grid or the load.
  • the controller 104 sends an alarm message that a leakage fault occurs in the circuit between the first power conversion circuit and the power grid or the load to the display device.
  • the controller 104 sends 4 to the display device, where 4 represents that a leakage fault occurs in the circuit between the first power conversion circuit and the power grid or the load.
  • the controller 104 can send the alarm message that a leakage fault occurs in the circuit between the first power conversion circuit and the power grid or the load to the cloud server, and the cloud server can mark and process the situation where a leakage fault occurs in the circuit between the battery cluster control circuit and the first power conversion circuit.
  • the controller 104 determines that there is no leakage fault in the energy storage system.
  • the battery cluster control circuit 101 and the first power conversion circuit 102 are both in the on state, and the first detection circuit 103 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold. It can be considered that the first detection circuit 103 falsely reports and causes the controller 104 to execute step S201.
  • the controller detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold in the first detection circuit 103, determines that there is no leakage fault in the energy storage system, and restores the normal operation of the energy storage system.
  • the controller 104 can cancel the alarm information.
  • the controller 104 continues to execute the fault location method shown in Figures 2 and 4 to check where the energy storage system has leakage.
  • the controller disconnects the battery cluster control circuit from the first power conversion circuit.
  • the battery cluster control circuit and the first connection switch unit, the first power switch unit and the second connection switch unit in the first power conversion circuit are turned on in sequence, and the place causing the leakage fault of the energy storage system is checked. It can be determined that the circuit between the battery cluster control circuit and the first power conversion circuit, the first power conversion circuit or the circuit between the first power conversion circuit and the load or the power grid is faulty, thereby locating the leakage fault of the energy storage system, facilitating the maintenance of the energy storage system, and increasing the maintenance efficiency.
  • the energy storage system further includes a second detection circuit, which is disposed between the battery cluster and the battery cluster control circuit.
  • the structural block diagram of the energy storage system is shown in FIG5. Referring to FIG5, the energy storage system includes a battery cluster 500, a battery cluster control circuit 501, a first power conversion circuit 502, a first detection circuit 503, a controller 504, and a second detection circuit 505.
  • the battery cluster 500 is connected to one end of the battery cluster control circuit 501, the other end of the battery cluster control circuit 501 is connected to one end of the first power conversion circuit 502, and the other end of the first power conversion circuit 502 is connected to the power grid or the load.
  • the first detection circuit 503 is provided between the first power conversion circuit 502 and the power grid or the load, and the second detection circuit 505 is provided between the battery cluster 500 and the battery cluster control circuit 501.
  • the second detection circuit 505 is a leakage current protection device of the battery cluster 500, which can be specifically implemented as an RCD.
  • the controller 504 can determine that a leakage fault occurs in the battery cluster 500 when the second detection circuit 505 detects that the leakage current of the battery cluster 500 is greater than the battery safety current, and send an alarm message that the battery cluster 500 has a leakage fault.
  • the controller 504 sends an alarm message that the battery cluster 500 has a leakage fault to a display device.
  • the controller 504 sends 1 to the display device, and 1 represents that the battery cluster 500 has a leakage fault.
  • the display device displays 1, indicating that the battery cluster 500 has a leakage fault.
  • the controller 504 can send the alarm message that the battery cluster 500 has a leakage fault to a cloud server, and the cloud server can mark and process the leakage fault of the battery cluster 500.
  • the magnitude of the battery safety current may be preset, and the battery safety current is related to the type of the battery cluster 500 and the number of battery packs included in the battery cluster 500 .
  • the controller 504 may further determine whether a leakage fault occurs in the battery cluster 500 according to whether the leakage current of the battery cluster 500 detected by the second detection circuit 505 is greater than the battery safety current. Exemplarily, before controlling the battery cluster control circuit 501 to be turned on, the controller 504 determines whether a leakage fault occurs in the battery cluster 500 according to whether the leakage current of the battery cluster 500 detected by the second detection circuit 505 is greater than the battery safety current.
  • the controller 504 determines that a leakage fault occurs in the battery cluster 500, and issues an alarm message indicating that a leakage fault occurs in the battery cluster 500, which can shorten the response time to the fault. If the second detection circuit 505 detects that the leakage current of the battery cluster 500 is less than or equal to the battery safety current, the controller 504 continues to control the battery cluster control circuit 501 to be turned on, and determines whether the leakage current of the energy storage system detected by the first detection circuit 503 is greater than the preset safety threshold.
  • the controller 504 determines that a leakage fault occurs in the battery cluster 500. That is, the embodiment of the present application can provide a dual judgment of leakage faults for the battery cluster, which is safe.
  • the controller 504 may update the preset safety threshold based on the leakage current of the battery cluster 500 detected by the second detection circuit 505 when no leakage fault occurs in the battery cluster 500.
  • the second detection circuit 505 detects that the leakage current of the battery cluster 500 is less than or equal to the battery safety current.
  • the battery safety current is 1A
  • the preset safety threshold is 2.5A.
  • the second detection circuit 505 detects that the leakage current of the battery cluster is 0.1A, and at this time, the 0.1A is the normal leakage current of the battery cluster.
  • the preset safety threshold is updated based on the normal leakage current of the battery cluster, which can reduce the impact of the normal leakage current of the battery cluster on fault detection, and can improve the detection accuracy of the leakage current of the energy storage system, reduce the risk of false alarm of the first detection circuit, and have high system reliability.
  • the energy storage system includes a battery cluster 600, a battery cluster control circuit 601, a first power conversion circuit 602, a first detection circuit 603, a controller 604, and a second power conversion circuit 605.
  • the battery cluster 600 is connected to one end of the battery cluster control circuit 601, the other end of the battery cluster control circuit 601 is connected to one end of the second power conversion circuit 605, the other end of the second power conversion circuit 605 is connected to one end of the first power conversion circuit 602, and the other end of the first power conversion circuit 602 is connected to the power grid or load.
  • the first detection circuit 603 is arranged between the first power conversion circuit 602 and the power grid or load. Different from the energy storage system shown in FIG. 1, the energy storage system provided in the embodiment of the present application adds a second power conversion circuit 605.
  • the second power conversion circuit 605 can convert the input voltage or output voltage of the battery cluster.
  • the second power conversion circuit 605 can be specifically implemented as a DC/DC converter, an AC/DC converter, or a DC/AC converter.
  • the specific implementation of the second power conversion circuit 605 can be adjusted according to the first power conversion circuit.
  • the structural block diagram of the second power conversion circuit 605 is shown in FIG7 .
  • the second power conversion circuit 605 includes a second power switch unit 6051 and a third connection switch unit 6052.
  • One end of the second power switch unit 6051 is connected to the battery cluster control circuit 601.
  • the other end of the switch unit 6051 is connected to one end of the third connection switch unit 6052, and the other end of the third connection switch unit 6052 is connected to the first power conversion circuit 602. It can be understood that the other end of the third connection switch unit 6052 is specifically connected to the first connection switch unit in the first power conversion circuit 602.
  • At least one of the second power switch unit 6051 and the third connection switch unit 6052 may be a solid-state switch or a semiconductor switch.
  • the controller 604 is connected to the battery cluster control circuit 601, the first power conversion circuit 602, the first detection circuit 603 and the second power conversion circuit 605.
  • the controller 604 can execute the leakage fault location method shown in FIG8 to locate the location where the leakage occurs in the energy storage system. The specific execution steps are as follows:
  • the controller 604 controls the battery cluster control circuit 601, the first power conversion circuit 602 and the second power conversion circuit 605 to shut down when the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold.
  • the controller 604 controls the second power conversion circuit 605 to shut down, that is, disconnects the closing point 4 and the closing point 5.
  • the closing point 4 and the closing point 5 can be considered as the place where the switch unit can be controlled by the controller 604, such as the controller 604 disconnects the closing point 4, that is, disconnects the connection between the second power switch unit 6051 and the battery cluster control circuit 601; the controller 604 disconnects the closing point 5, that is, disconnects the connection between the second power switch unit 6051 and the third connection switch unit 6052.
  • the structure of the first power conversion circuit 602 may be as shown in FIG3 , that is, the controller disconnecting the first power conversion circuit 602 may be understood as disconnecting the closing point 1 , the closing point 2 , and the closing point 3 .
  • the controller 604 determines whether the leakage current of the energy storage system detected by the first detection circuit 603 is greater than the preset safety threshold. At this time, the battery cluster control circuit 601 is turned on. If the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 604 executes step S804a, otherwise the controller 604 executes step S804b.
  • the controller 604 sends an alarm message that the battery cluster 600 has a leakage fault.
  • the battery cluster control circuit 601 is in a conducting state, and the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold, then it can be considered that the leakage current of the energy storage system is caused by the battery cluster 600.
  • the controller 604 determines that the battery cluster 600 has a leakage fault, and sends an alarm message that the battery cluster 600 has a leakage fault.
  • the controller 504 sends an alarm message that the battery cluster 500 has a leakage fault to a display device, for example, the controller 504 sends 1 to the display device, 1 represents that the battery cluster 600 has a leakage fault.
  • the display device displays 1, indicating that the battery cluster 600 has a leakage fault.
  • the controller 604 can send the alarm message that the battery cluster 600 has a leakage fault to a cloud server, and the cloud server can mark and process the leakage fault of the battery cluster 600.
  • a second detection circuit (not shown in the figure) is set between the battery cluster 600 and the battery cluster control circuit 601, so that a dual judgment of leakage fault can be provided for the battery cluster 600, and the preset safety threshold of the energy storage system shown in FIG. 6 can also be updated.
  • the controller 604 controls the second power switch unit to be turned on.
  • the battery cluster control circuit 601 is in the on state
  • the first detection circuit 603 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, then it can be considered that the battery cluster 600 has no leakage fault
  • the controller 604 further controls the second power switch unit 6051 to be turned on, that is, controls the closing point 4 to be closed, and turns on the connection between the battery cluster control circuit 601 and the second power switch unit 6051.
  • the third connection switch unit 6052 and the first power conversion circuit 602 are still in the off state.
  • step S805 The controller 604 determines whether the leakage current of the energy storage system detected by the first detection circuit 603 is greater than the preset safety threshold. At this time, the battery cluster control circuit 601 and the second power switch unit 6051 are in the on state. If the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 604 executes step S806a, otherwise the controller 604 executes step S806b.
  • the controller 604 sends an alarm message that the battery cluster control circuit 601 has a leakage fault.
  • the controller 604 since the controller 604 is after executing step S804b, that is, the controller 604 excludes the possibility of a leakage fault in the battery cluster 600, and further controls the second power switch unit 6051 to be turned on, at this time, the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold, then it can be considered that the leakage current of the energy storage system is caused by the battery cluster control circuit 601, and the controller 604 determines that the battery cluster control circuit 601 has a leakage fault, and sends an alarm message that the battery cluster control circuit has a leakage fault.
  • the controller 604 sends 5 to the display device, and 5 represents that the battery cluster control circuit 601 has a leakage fault. Further, the display device displays 5, indicating that the battery cluster control circuit 601 has a leakage fault.
  • the controller 104 can send the alarm message of the battery cluster control circuit 601 to the cloud server, and the cloud server can mark and process the leakage fault of the battery cluster 100.
  • the controller 604 controls the third connection switch unit 6052 to be turned on. At this time, the battery cluster control circuit 601 and the first power switch unit 6051 are in the on state, and the first detection circuit 603 detects that the leakage current of the energy storage system is less than or equal to the preset safety threshold, then it can be recognized that To ensure that the battery cluster 600 and the battery cluster control circuit 601 do not have leakage faults, the controller 604 further controls the third connection switch unit 6052 to be turned on.
  • the controller 604 determines whether the leakage current of the energy storage system detected by the first detection circuit 603 is greater than the preset safety threshold. At this time, the battery cluster control circuit 601, the second power switch unit 6051 and the third connection switch unit 6052 are in the on state. If the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold, the controller 604 executes step S808a, otherwise the controller 604 executes step S808b.
  • the controller 604 sends an alarm message that the second power conversion circuit 605 has a leakage fault.
  • the controller 604 since the controller 604 is after executing step S806b, that is, the controller 604 excludes the possibility of a leakage fault in the battery cluster control circuit 601, and further controls the third connection switch unit 6052 to be turned on, at this time, the first detection circuit 603 detects that the leakage current of the energy storage system is greater than the preset safety threshold, then it can be considered that the leakage current of the energy storage system is caused by the second power conversion circuit 605, and the controller 604 determines that the second power conversion circuit 605 has a leakage fault, and sends an alarm message that the second power conversion circuit has a leakage fault.
  • the controller 604 sends an alarm message that the second power conversion circuit has a leakage fault to the display device, for example, the controller 604 sends 6 to the display device, and 6 represents that the second power conversion circuit 605 has a leakage fault. Further, the display device displays 6, indicating that the second power conversion circuit 605 has a leakage fault. Alternatively, the controller 604 may send an alarm message indicating that the second power conversion circuit 605 has a leakage fault to the cloud server, and the cloud server may then mark and process the leakage fault in the second power conversion circuit 605 .
  • the controller 604 controls the first connection switch unit to be turned on. At this time, the controller 604 may execute the fault location method shown in FIG4 .
  • the specific implementation method may be combined with the embodiment described in FIG4 , which will not be described in detail here.
  • a second power conversion circuit is added between the battery cluster control circuit and the first power conversion circuit to enhance the adaptability of the energy storage system.
  • the second power conversion circuit and the first power conversion circuit can perform two-stage conversion on the output voltage or input voltage of the battery cluster, so that the energy storage system can be applied to more scenarios.

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Abstract

本申请提供了一种储能系统及其漏电故障定位方法，在储能系统中，电池簇连接电池簇控制电路的一端，电池簇控制电路的另一端连接第一功率变换电路的一端，第一功率变换电路的另一端用于连接电网或负载，第一检测电路设于第一功率变换电路与电网或负载之间，控制器在第一检测电路检测到储能系统的漏电流大于预设安全阈值的情况下，控制电池簇控制电路和第一功率变换电路关断；并且，控制器在控制电池簇控制电路和第一功率变换电路关断之后，控制电池簇控制电路导通，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送电池簇发生漏电故障的告警信息。实施本申请，可以确定储能系统发生漏电故障的位置，便于系统维护。

Description

一种储能系统及其漏电故障定位方法
本申请要求在2023年3月9日提交中国国家知识产权局、申请号为202310271679.7的中国专利申请的优先权，发明名称为“一种储能系统及其漏电故障定位方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及储能技术领域，尤其是一种储能系统及其漏电故障定位方法。
背景技术
由于储能系统中的电池簇、线缆或者功能模块电路出现漏电故障，导致该储能系统对地存在较大的漏电流，造成安全事故的发生。所以在现有的储能系统中，若储能系统中有地方出现漏电故障，储能系统会产生保护动作，即断开储能系统中各个功率模块电路之间的连接。然后对储能系统的漏电故障进行人工排查，给系统维护带来了一定困难。
发明内容
本申请提供了一种储能系统及其漏电故障定位方法，可以确定储能系统发生漏电故障的位置，便于系统维护。
第一方面，本申请提供了一种储能系统，该储能系统包括电池簇、电池簇控制电路、第一功率变换电路、第一检测电路以及控制器。
其中，该储能系统的具体连接关系为：电池簇连接电池簇控制电路的一端，电池簇控制电路的另一端连接第一功率变换电路的一端，第一功率变换电路的另一端用于连接电网或负载，第一检测电路设于第一功率变换电路与电网或负载之间。
具体实现中，控制器在第一检测电路检测到储能系统的漏电流大于预设安全阈值的情况下，控制电池簇控制电路和第一功率变换电路关断；并且，控制器在控制电池簇控制电路和第一功率变换电路关断之后，控制电池簇控制电路导通，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送电池簇发生漏电故障的告警信息。
在本申请实施例中，在储能系统出现漏电故障之后，控制器在断开电池簇控制电路与第一功率变换电路之后，进一步导通电池簇控制电路，并对储能系统的漏电流进行检测，从而可以排查出电池簇导致储能系统出现漏电故障的情况，即确定储能系统中的电池簇发生漏电故障，可以直接对该电池簇进行维修或更换，便于储能系统的维护，维护效率高。
结合第一方面，在第一种可能的实现方式中，第一功率变换电路包括第一连接开关单元，第一连接开关单元用于连接电池簇控制电路。
控制器在电池簇控制电路导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制第一连接开关单元导通；此时，在第一连接开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，控制器发送电池簇控制电路与第一功率变换电路之间的回路发生漏电故障的告警信息。
结合第一方面第一种可能的实现方式，在第二种可能的实现方式中，第一功率变换电路还包括第一功率开关单元，第一功率开关单元设于第一连接开关单元与第一检测电路之间。
在第一连接开关单元导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制器控制第一功率开关单元导通；此时，在第一功率开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，控制器发送第一功率变换电路发生漏电故障的告警信息。
结合第一方面第一种可能的实现方式或结合第一方面第二种可能的实现方式，在第三种可能的实现方式中，第一功率变换电路还包括第二连接开关单元，第二连接开关单元设于第一功率开关单元与第一检测电路之间。
在第一功率开关单元导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制器控制第二连接开关单元导通；并且在第二连接开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值的情况下，控制器发送第一功率变换电路与电网或负载之间的回路 发生漏电故障的告警信息。
结合第一方面第一种可能的实现方式至结合第一方面第三种可能的实现方式，在第四种可能的实现方式中，储能系统还包括第二功率变换电路，第二功率变换电路设于电池簇控制电路与第一连接开关单元之间；其中，功率变换电路包括第二功率开关单元，第二功率开关单元用于对电池簇的输入电压或输出电压进行变换。
在电池簇控制电路导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制器在控制第一连接开关单元导通之前，控制第二功率开关单元导通；此时，在第二功率开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，控制器发送电池簇控制电路发生漏电故障的告警信息。
结合第一方面第四种可能的实现方式，在第五种可能的实现方式中，第二功率变换电路还包括第三连接开关单元，第三连接开关单元用于连接第一连接开关单元。
在第二功率开关单元导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制器控制第三连接开关单元导通；并且，在第三连接开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，控制器发送第二功率变换电路发生漏电故障的告警信息。
结合第一方面或结合第一方面上述任意一种可能的实现方式，在第六种可能的实现方式中，储能系统还包括第二检测电路，第二检测电路设于电池簇与电池簇控制电路之间。
在第二检测电路检测到电池簇的漏电流大于电池安全电流的情况下，控制器发送电池簇发生漏电故障的告警信息。实施本申请实施例，可以为电池簇提供漏电故障的双重判断，安全性好。
结合第一方面第六种可能的实现方式，在第七种可能的实现方式中，控制器在电池簇未发生漏电故障的情况下，基于第二检测电路检测到电池簇的漏电流对预设安全阈值进行更新。
第二方面，本申请实施例提供了一种储能系统的漏电故障定位方法，其中储能系统包括电池簇、电池簇控制电路、第一功率变换电路以及第一检测电路，该储能系统的具体连接关系为：电池簇连接电池簇控制电路的一端，电池簇控制电路的另一端连接第一功率变换电路的一端，第一功率变换电路的另一端用于连接电网或负载；第一检测电路设于第一功率变换电路与电网或负载之间。
漏电故障定位方法具体实现为：在第一检测电路检测到储能系统的漏电流大于预设安全阈值的情况下，控制电池簇控制电路和第一功率变换电路关断；在控制电池簇控制电路和第一功率变换电路关断之后，控制电池簇控制电路导通，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送电池簇发生漏电故障的告警信息。
结合第二方面，在第一种可能的实现方式中，第一功率变换电路包括第一连接开关单元，第一连接开关单元用于连接电池簇控制电路。
漏电故障定位方法还包括：
在控制电池簇控制电路导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制第一连接开关单元导通；在第一连接开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送电池簇与第一功率变换电路之间的回路发生漏电故障的告警信息。
结合第二方面第一种可能的实现方式，在第二种可能的实现方式中，第一功率变换电路还包括第一功率开关单元，第一功率开关单元设于第一连接开关单元与第一检测电路之间；
漏电故障定位方法还包括：
在第一连接开关单元导通，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制第一功率开关单元导通；在第一功率开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送第一功率变换电路发生漏电故障的告警信息。
结合第二方面第一种可能的实现方式或结合第二方面第二种可能的实现方式，在第三种可能的实现方式中，第一功率变换电路还包括第二连接开关单元，第二连接开关单元设于第一功率开关单元与第一检测电路之间；
漏电故障定位方法还包括：
在第一功率开关单元导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制第二连接开关单元导通；在第二连接开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送第一功率变换电路与电网或负载之间的回路发生漏电故障的告警信息。
结合第二方面第一种可能的实现方式至结合第二方面第三种可能的实现方式，在第四种可能的实现方式中，储能系统还包括第二功率变换电路，第二功率变换电路设于电池簇控制电路与第一连接开关单元之 间；其中，功率变换电路还包括第二功率开关单元，第二功率开关单元用于对电池簇的输入电压或输出电压进行变换；
漏电故障定位方法还包括：
在电池簇控制电路导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，在控制第一连接开关单元导通之前，控制第二功率开关单元导通；在第二功率开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送电池簇控制电路发生漏电故障的告警信息。
结合第二方面第四种可能的实现方式，在第五种可能的实现方式中，第二功率变换电路还包括第三连接开关单元，第三连接开关单元用于连接第一连接开关单元；
漏电故障定位方法还包括：
在第二功率开关单元导通的情况下，若第一检测电路检测到储能系统的漏电流小于或等于预设安全阈值，控制第三连接开关单元导通；在第三连接开关单元导通的情况下，基于第一检测电路检测到储能系统的漏电流大于预设安全阈值，发送第二功率变换电路发生漏电故障的告警信息。
结合第二方面或结合第二方面上述任意一种可能的实现方式，在第六种可能的实现方式中，储能系统还包括第二检测电路，第二检测电路设于电池簇与电池簇控制电路之间；
漏电故障定位方法还包括：
在第二检测电路检测到电池簇的漏电流大于电池安全电流的情况下，发送电池簇发生漏电故障的告警信息。
结合第二方面第六种可能的实现方式，在第七种可能的实现方式中，漏电故障定位方法还包括：
在电池簇未发生漏电故障的情况下，基于第二检测电路检测到电池簇的漏电流对预设安全阈值进行更新。
应理解的是，本申请上述多个方面的实现和有益效果可以相互参考。
附图说明
图1为本申请实施例提供的储能系统的一结构框图；
图2为本申请实施例提供的储能系统的漏电故障定位方法的一流程示意图；
图3为本申请实施例提供的第一功率变换电路的结构框图；
图4为本申请实施例提供的储能系统的漏电故障定位方法的又一流程示意图；
图5为本申请实施例提供的储能系统的又一结构框图；
图6为本申请实施例提供的储能系统的又一结构框图；
图7为本申请实施例提供的第二功率变换电路的结构框图；
图8为本申请实施例提供的储能系统的漏电故障定位方法的又一流程示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
下面结合附图来对本申请的技术方案的实施作进一步的详细描述。
参见图1，图1为本申请实施例提供的储能系统的一结构框图。如图1所示，该储能系统包括电池簇100、电池簇控制电路101、第一功率变换电路102、第一检测电路103以及控制器104。
其中，电池簇100连接电池簇控制电路101的一端。示例性的，电池簇100可以包括一个电池包，或者包括多个具有串联、并联或串并联连接关系的电池包。其中，电池簇控制电路101可以对电池簇100进行管理，一般可以设置在电池簇100的高压控制箱内。示例性的，电池簇控制电路101可以采集电池簇100的电压和电流、汇总电池簇100内各个电池包的电压和温度信息、计算电池簇100的荷电状态等。可选的，电池簇控制电路101可以具有CAN通讯接口，实现与其他功能电路的数据通讯功能。或者电池簇控制电路101还可以具备RS-485通讯接口或者以太网通讯接口，从而实现与外部设备的通讯。需要说明的是，电池簇控制电路101的具体实现方式可以参考现有技术，本申请实施例不对电池簇控制电路101进行限制。
电池簇控制电路101的另一端连接第一功率变换电路102的一端，第一功率变换电路102的另一端可以连接电网或负载。示例性的，第一功率变换电路102可以实现为储能变流器(Power Conversion System， PCS)、DC/DC变换器、AC/DC变换器或者DC/AC变换器等。第一功率变换电路102的具体实现可以根据第一功率变换电路102的另一端连接的器件进行调整。例如，第一功率变换电路102连接电网，则该第一功率变换电路102可以实现为DC/AC变换器，此时该第一功率变换电路102可以将电池簇100输出的直流电转换为交流电并入电网；或者该第一功率变换电路102可以实现为PCS，此时第一功率变换电路102除了可以将电池簇100输出的直流电转换为交流电并入电网之外，还可以进一步将电网提供的交流电转换为直流电向电池簇100进行充电。又例如，第一功率变换电路102连接负载，该负载具体实现为直流负载，则该第一功率变换电路102可以实现为DC/DC变换器，可以将电池簇100输出的直流电进行变换之后向直流负载提供。
第一检测电路103设于第一功率变换电路102与电网/负载之间。示例性的，第一检测电路103是储能系统中的漏电流保护装置,可以具体实现为剩余电流装置(Residual Current Device，RCD)。
控制器104连接电池簇控制电路101、第一功率变换电路102和第一检测电路103。具体实现中，控制器104可以具体实现为微控制单元(Micro Control Unit，MCU)、中央处理单元(central processing unit，CPU)、其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field-programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。
在一些可行的实施方式中，储能系统中还包括Y电容，Y电容是分别跨接在电力线两线和地之间的电容，一般是成对出现，例如图1中示出的电容C11和电容C12。储能系统中的漏电流具体指的是电力线两线与地之间的电流，比如说一条电力线经过电容C11对地形成回路，储能系统的地通过机柜的外壳接入大地。同理的，另一条电力线也可以经过电容C12对地形成回路。所以储能系统对地的漏电流，可以认为电力线与外壳之间的电流。可选的，储能系统中可以包括多对Y电容，例如图1中示出的电容C13和电容C14。
在本申请实施例中，控制器104可以执行图2中示出的漏电故障定位方法，对储能系统的漏电故障进行定位。其中，具体执行步骤如下：
S201、控制器104可以在第一检测电路103检测到储能系统的漏电流大于预设安全阈值的情况下，控制电池簇控制电路101和第一功率变换电路102关断。
具体实现中，第一检测电路103可以采用电流互感器来检测两条电力线之间的电流相量和，从而得到储能系统的漏电流。此时第一检测电路103中的电流互感器是横跨在两条电力线上的，具体实现原理可以参考现有RCD，此处不作赘述。
第一检测电路103检测到储能系统的漏电流大于预设安全阈值时，控制器104确定储能系统出现了漏电故障，控制器104对储能系统进行保护，即控制电池簇控制电路101和第一功率变换电路102关断。
其中，预设安全阈值的大小可以预先设置，该预设安全阈值与储能系统中设置的级数和储能系统正常运行时存在的漏电流有关。示例性的，储能系统中设置的级数可以理解为；电池簇100是一级，电池簇控制电路101是一级，第一功率变换电路102是一级，此时图1中示出的储能系统的级数是3。假设本申请的发明人通过测量和观察得知储能系统正常运行时存在的漏电流是0.5A，或者本申请的发明人通过理论计算得知储能系统正常运行时存在的漏电流是0.5A。并且，本申请的发明人在研究和实践中根据储能系统的级数对应设定一个放大系数，比如级数3对应的放大系数是5。此时，控制器104中存储有储能系统正常运行是存在的漏电流以及储能系统级数对应的放大系数，则控制器104将储能系统正常运行是存在的漏电流乘以放大系数，即为预设安全阈值。示例性的，预设安全阈值为：0.5A×5＝2.5A。
可选的，在不同的储能系统中，储能系统的级数和储能系统正常运行时存在的漏电流不同，该预设安全阈值的大小可以不同。
S202、控制器104在控制电池簇控制电路101和第一功率变换电路102关断之后，控制电池簇控制电路101导通。
S203、控制器104判断第一检测电路103检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路101导通。若第一检测电路103检测到储能系统的漏电流大于预设安全阈值，控制器104执行步骤S204a，否则控制器104执行步骤S204b。
S204a、控制器104发送电池簇100发生漏电故障的告警信息。此时，电池簇控制电路101处于导通状态，第一检测电路103检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是由电池簇100引起的，控制器104确定电池簇100发生漏电故障，并发送电池簇100发生漏电故障的告警信息。可选的，储能系统中设有显示装置，控制器104向该显示装置发送电池簇100发生漏电故障的告警信息，例如，控制器104向该显示装置发送1，1代表着电池簇100发生漏电故障。进一步的，该显示装置 显示1，指示电池簇100发生漏电故障。或者，控制器104可以将电池簇100发生漏电故障的告警信息发送至云服务器，该云服务器用于管理多个储能系统，此时该云服务器可以对电池簇100漏电故障的情况进行标记和处理。
在本申请实施例中，在储能系统出现漏电故障之后，控制器在断开电池簇控制电路与第一功率变换电路之后，进一步导通电池簇控制电路，并对储能系统的漏电流进行检测，从而可以排查出电池簇导致储能系统出现漏电故障的情况，即确定储能系统中的电池簇发生漏电故障，并发送电池簇发生漏电故障的告警信息，使得维修人员可以直接定位储能系统发生故障的位置，并对该电池簇进行维修或更换，便于储能系统的维护，维护效率高。
S204b、控制器104控制第一连接开关单元导通。此时，电池簇控制电路101处于导通状态，第一检测电路103检测到储能系统的漏电流小于或等于预设安全阈值，则可以认为电池簇100没有发生漏电故障，控制器104进一步控制第一连接开关单元导通。
其中，第一连接开关单元是第一功率变换电路102中的一部分。具体实现中，第一功率变换电路102的结构如图3所示，即第一功率变换电路102中包括第一连接开关单元1021、第一功率开关单元1022和第二连接开关单元1023。其中，第一连接开关单元1021连接电池簇控制电路101，第一功率开关单元1022设在第一连接开关单元1021与第一检测电路103之间，第二连接开关单元1023设在第一功率开关单元1022与第一检测电路103之间。即第一连接开关单元1021的一端连接电池簇控制电路101，第一连接开关单元1021的另一端连接第一功率开关单元1022的一端，第一功率开关单元1022的另一端连接第二连接开关单元1023的一端，第二连接开关单元1023的另一端连接负载或电网。
在一些可行的实施方式中，第一连接开关单元1021、第一功率开关单元1022和第二连接开关单元1023中的至少一个可以具体实现为固态开关，例如接触器或继电器等。或者，第一连接开关单元1021、第一功率开关单元1022和第二连接开关单元1023中的至少一个可以具体实现为半导体开关，例如金属氧化物半导体场效应晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor,MOSFET)或绝缘栅双极型晶体管(Insulated Gate Bipolar Transistor，IGBT)。
控制器104在步骤S201控制第一功率变换电路102关断，即控制第一连接开关单元1021、第一功率开关单元1022和第二连接开关单元1023均关断，即断开闭合点1、闭合点2和闭合点3。可以理解的是，闭合点1、闭合点2和闭合点3可以认为是该开关单元可以由控制器104控制的地方，比如说控制器104断开闭合点1，即断开第一连接开关单元1021与电池簇控制电路101以及第一功率变换电路1022的连接；控制器104断开闭合点2，即断开第一功率开关单元1022与第一连接开关单元1021与第二连接开关单元1023的连接；控制器104断开闭合点3，即断开第二连接开关单元1023与第一功率开关单元1022与电网或负载的连接。
在控制器104执行步骤S202之后，第一检测电路103检测到储能系统的漏电流小于或等于预设安全阈值的情况下，控制器104控制第一连接开关单元1021导通，即控制闭合点1闭合，导通第一连接开关单元1021与电池簇控制电路101的连接。此时，第一功率开关单元1022和第二连接开关单元1023还是处于关断状态。
此时，控制器可以继续执行图4中示出的漏电故障定位方法，其中，具体执行步骤如下：
S205、在第一连接开关单元1021导通的情况下，控制器104判断第一检测电路103检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路101和第一连接开关单元1021处于导通状态，若第一检测电路103检测到储能系统的漏电流大于预设安全阈值，控制器104执行步骤S206a，否则控制器104执行步骤S206b。
S206a、控制器104发送电池簇控制电路101与第一功率变换电路102之间的回路发生漏电故障的告警信息。具体实现中，由于控制器104是在执行步骤S204b之后，进一步控制第一连接开关单元1021导通，即控制器104排除电池簇100发生漏电故障的可能，进一步控制第一连接开关单元1021导通，此时第一检测电路103检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是电池簇控制电路101与第一功率变换电路102之间的回路引起的，即确定电池簇控制电路101与第一功率变换电路102之间的回路发生漏电故障。示例性的，电池簇控制电路101与第一功率变换电路102之间的回路发生漏电故障可以是连接电池簇控制电路101与第一功率变换电路102之间的线缆出现了漏电故障，或者是电池簇控制电路101与第一功率变换电路102之间的接触器或继电器出现了漏电故障等。此时，控制器104在确定电池簇控制电路101与第一功率变换电路102之间的回路发生漏电故障的情况下，发送电池簇控制电路与第一功率变换电路之间的回路发生漏电故障的告警信息。可选的，控制器104向显示装置发送电池 簇控制电路与第一功率变换电路之间的回路发生漏电故障的告警信息，例如，控制器104向该显示装置发送2，2代表电池簇控制电路101与第一功率变换电路102之间的回路发生漏电故障。或者，控制器104可以将电池簇控制电路与第一功率变换电路之间的回路发生漏电故障的告警信息发送至云服务器，云服务器可以对电池簇控制电路与第一功率变换电路之间的回路发生漏电故障的情况进行标记和处理。
S206b、控制器104控制第一功率开关单元1022导通。此时，电池簇控制电路101和第一连接开关单元1021处于导通状态，第一检测电路103检测到储能系统的漏电流小于或等于预设安全阈值，则可以认为电池簇100和电池簇控制电路101与第一功率变换电路102之间的回路没有发生漏电故障，控制器104进一步控制第一功率开关单元1022导通。
S207、控制器104判断第一检测电路103检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路101、第一连接开关单元1021和第一功率开关单元1022处于导通状态，若第一检测电路103检测到储能系统的漏电流大于预设安全阈值，控制器104执行步骤S208a，否则控制器104执行步骤S208b。
S208a、控制器104发送第一功率变换电路102发生漏电故障的告警信息。具体实现中，由于控制器104是在执行步骤S206b之后，即控制器104排除了电池簇100以及电池簇控制电路101与第一功率变换电路102之间的回路出现漏电故障的可能，进一步控制第一功率开关单元1022导通，此时第一检测电路103检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是第一功率变换电路102引起，控制器104确定第一功率变换电路102发生漏电故障，并发送第一功率变换电路发生漏电故障的告警信息。可选的，控制器104向显示装置发送第一功率变换电路发生漏电故障的告警信息，例如，控制器104向显示装置发送3，3代表第一功率变换电路发生漏电故障。或者，控制器104可以将第一功率变换电路发生漏电故障的告警信息发送至云服务器，云服务器可以对第一功率变换电路发生漏电故障的情况进行标记和处理。
S208b、控制器104控制第二连接开关单元1023导通。此时电池簇控制电路101、第一连接开关单元1021和第一功率开关单元1022处于导通状态，第一检测电路103检测到储能系统的漏电流小于或等于预设安全阈值，则可以认为电池簇100、电池簇控制电路101与第一功率变换电路102之间的回路以及第一功率变换电路102均没有发生漏电故障，控制器104进一步控制第二连接开关单元1023导通。
S209、控制器104判断第一检测电路103检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路101、第一连接开关单元1021、第一功率开关单元1022和第二连接开关单元1023处于导通状态，若第一检测电路103检测到储能系统的漏电流大于预设安全阈值，控制器104执行步骤S210a，否则控制器104执行步骤S210b。
S210a、控制器104发送第一功率变换电路102与电网或负载之间的回路发生漏电故障的告警信息。具体实现中，由于控制器104是在执行步骤S208b之后，即控制器104排除了电池簇100、电池簇控制电路101与第一功率变换电路102之间的回路以及第一功率变换电路102出现漏电故障的可能，进一步控制第二连接开关单元1023导通，此时第一检测电路103检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是第一功率变换电路102与电网或负载之间的回路引起的，即确定第一功率变换电路102与电网或负载之间的回路发生漏电故障。示例性的，第一功率变换电路102与电网或负载之间的回路发生漏电故障可以是连接第一功率变换电路102与电网或负载之间的线缆出现故障，或者是第一功率变换电路102与电网或负载之间的接触器或继电器出现漏电故障。此时，控制器104在确定第一功率变换电路102与电网或负载之间的回路发生漏电故障的情况下，发送第一功率变换电路与电网或负载之间的回路发生漏电故障的告警信息。可选的，控制器104向显示装置发送第一功率变换电路与电网或负载之间的回路发生漏电故障的告警信息，例如，控制器104向显示装置发送发出4，4代表第一功率变换电路与电网或负载之间的回路发生漏电故障。或者，控制器104可以将第一功率变换电路与电网或负载之间的回路发生漏电故障的告警信息发送至云服务器，云服务器可以对电池簇控制电路与第一功率变换电路之间的回路发生漏电故障的情况进行标记和处理。
S210b、控制器104确定储能系统未发生漏电故障。此时，电池簇控制电路101、第一功率变换电路102均处于导通状态，第一检测电路103检测到储能系统的漏电流小于或等于预设安全阈值，则可以认为是第一检测电路103误报导致控制器104执行步骤S201，控制器在第一检测电路103检测到储能系统的漏电流小于或等于预设安全阈值，确定储能系统未发生漏电故障，恢复储能系统的正常运行。可选的，控制器104可以解除告警信息。进一步的，第一检测电路若再次检测到储能系统的漏电流大于预设安全阈值，控制器104继续执行图2和图4中示出的故障定位方法，对储能系统出现漏电的地方进行排查。
在本申请实施例中，在储能系统出现漏电故障之后，控制器在断开电池簇控制电路与第一功率变换电 路之后，依次导通电池簇控制电路以及第一功率变换电路中的第一连接开关单元、第一功率开关单元和第二连接开关单元，对导致储能系统出现漏电故障的地方进行排查，可以确定是电池簇控制电路与第一功率变换电路之间的回路、第一功率变换电路或第一功率变换电路与负载或电网之间的回路发生故障，从而实现对储能系统的漏电故障的定位，便于储能系统的维护，维护效率高。
在一些可行的实施方式中，储能系统还包括第二检测电路，该第二检测电路设于电池簇与电池簇控制电路之间，此时储能系统的结构框图如图5所示。参见图5，该储能系统包括电池簇500、电池簇控制电路501、第一功率变换电路502、第一检测电路503、控制器504以及第二检测电路505。
其中，电池簇500连接电池簇控制电路501的一端，电池簇控制电路501的另一端连接第一功率变换电路502的一端，第一功率变换电路502的另一端连接电网或负载。第一检测电路503设于第一功率变换电路502与电网或负载之间，第二检测电路505设于电池簇500与电池簇控制电路501之间。
其中，第二检测电路505是电池簇500的漏电流保护装置，可以具体实现为RCD。具体实现中，控制器504可以在第二检测电路505检测到电池簇500的漏电流大于电池安全电流的情况下，确定电池簇500发生漏电故障，并发送电池簇500发生漏电故障的告警信息。可选的，控制器504向显示装置发送电池簇500发生漏电故障的告警信息，例如，控制器504向该显示装置发送1，1代表着电池簇500发生漏电故障。进一步的，该显示装置显示1，指示电池簇500发生漏电故障。或者，控制器504可以将电池簇500发生漏电故障的告警信息发送至云服务器，该云服务器可以对电池簇500漏电故障的情况进行标记和处理。
示例性的，电池安全电流的大小可以预先设置，该电池安全电流与电池簇500的类型，以及电池簇500中包括的电池包的数量有关。
在本申请实施例中，控制器504除了可以执行前文结合图2至图4所描述的实施例之外，还可以进一步根据第二检测电路505检测到电池簇500的漏电流是否大于电池安全电流来判断电池簇500是否发生漏电故障。示例性的，控制器504在控制电池簇控制电路501导通之前，根据第二检测电路505检测到电池簇500的漏电流是否大于电池安全电流来判断电池簇500是否发生漏电故障，若第二检测电路505检测到电池簇500的漏电流大于电池安全电流，控制器504确定电池簇500发生漏电故障，并发出电池簇500发生漏电故障的告警信息，可以缩短故障的反应时间。若第二检测电路505检测到电池簇500的漏电流小于或等于电池安全电流，控制器504继续控制电池簇控制电路501导通，并判断第一检测电路503检测到储能系统的漏电流是否大于预设安全阈值，若第一检测电路503检测到储能系统的漏电流大于预设安全阈值，控制器504确定电池簇500发生漏电故障。即本申请实施例可以为电池簇提供漏电故障的双重判断，安全性好。
可选的，在一些可行的实施方式中，控制器504可以在电池簇500未发生漏电故障的情况下，基于第二检测电路505检测到电池簇500的漏电流对预设安全阈值进行更新。此时，第二检测电路505检测到电池簇500的漏电流小于或等于电池安全电流。示例性的，电池安全电流为1A，预设安全阈值为2.5A。第二检测电路505检测到电池簇的漏电流为0.1A，此时该0.1A是电池簇的正常漏电流。控制器504可以将电池簇的正常漏电流叠加在预设安全阈值上，即更新预设安全阈值为2.5A+0.1A＝2.6A。
在本申请实施例中，基于电池簇的正常漏电流对预设安全阈值进行更新，可以降低电池簇的正常漏电流对故障检测的影响，且可以提高储能系统的漏电流的检测精度，减小第一检测电路误报的风险，系统可靠性高。
可选的，在一些可行的实施方式中，参见图6，图6为本申请实施例提供的储能系统的又一结构框图。如图6所示，该储能系统包括电池簇600、电池簇控制电路601、第一功率变换电路602、第一检测电路603、控制器604以及第二功率变换电路605。
其中，电池簇600连接电池簇控制电路601的一端，电池簇控制电路601的另一端连接第二功率变换电路605的一端，第二功率变换电路605的另一端连接第一功率变换电路602的一端，第一功率变换电路602的另一端连接电网或负载。第一检测电路603设于第一功率变换电路602与电网或负载之间。区别于图1中示出的储能系统，本申请实施例提供的储能系统增加了第二功率变换电路605。
示例性的，第二功率变换电路605可以对电池簇的输入电压或输出电压进行变换。该第二功率变换电路605可以具体实现为DC/DC变换器、AC/DC变换器或者DC/AC变换器等。该第二功率变换电路605的具体实现可以根据第一功率变换电路来进行调整。
该第二功率变换电路605的结构框图如图7所示，第二功率变换电路605包括第二功率开关单元6051和第三连接开关单元6052。其中，第二功率开关单元6051的一端连接电池簇控制电路601，第二功率开 关单元6051的另一端连接第三连接开关单元6052的一端，第三连接开关单元6052的另一端连接第一功率变换电路602。可以理解的是，第三连接开关单元6052的另一端具体连接的是第一功率变换电路602中的第一连接开关单元。
可选的，第二功率开关单元6051和第三连接开关单元6052中的至少一个可以是固态开关或半导体开关。
控制器604连接电池簇控制电路601、第一功率变换电路602、第一检测电路603和第二功率变换电路605。具体实现中，控制器604可以执行图8中示出的漏电故障定位方法，对储能系统中发生漏电的位置进行定位。其中，具体执行步骤如下：
S801、控制器604在第一检测电路603检测到储能系统的漏电流大于预设安全阈值的情况下，控制电池簇控制电路601、第一功率变换电路602和第二功率变换电路605关断。示例性的，控制器604控制第二功率变换电路605关断，即断开闭合点4和闭合点5。可以理解的是，闭合点4和闭合点5可以认为是该开关单元可以由控制器604控制的地方，比如控制器604断开闭合点4，即断开第二功率开关单元6051与电池簇控制电路601的连接；控制器604断开闭合点5，即断开第二功率开关单元6051与第三连接开关单元6052的连接。
可选的，第一功率变换电路602的结构可以如图3所示，即控制器断开第一功率变换电路602可以理解为断开闭合点1、闭合点2和闭合点3。
S802、控制器604在控制电池簇控制电路601、第一功率变换电路602和第二功率变换电路605关断之后，控制电池簇控制电路601导通。
S803、控制器604判断第一检测电路603检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路601导通。若第一检测电路603检测到储能系统的漏电流大于预设安全阈值，控制器604执行步骤S804a，否则控制器604执行步骤S804b。
S804a、控制器604发送电池簇600发生漏电故障的告警信息。此时，电池簇控制电路601处于导通状态，第一检测电路603检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是由电池簇600引起的。控制器604确定电池簇600发生漏电故障，并发送电池簇600发生漏电故障的告警信息。可选的，控制器504向显示装置发送电池簇500发生漏电故障的告警信息，例如，控制器504向该显示装置发送1，1代表电池簇600发生漏电故障。进一步的，该显示装置显示1，指示电池簇600发生漏电故障。或者，控制器604可以将电池簇600发生漏电故障的告警信息发送至云服务器，该云服务器可以对电池簇600漏电故障的情况进行标记和处理。
可选的，在一些可行的实施方式中，在图6中示出的储能系统的基础上，在电池簇600与电池簇控制电路601之间设置第二检测电路(图中未示出)，即可以对电池簇600提供漏电故障的双重判断，也可以对图6中示出的储能系统的预设安全阈值进行更新。
S804b、控制器604控制第二功率开关单元导通。此时，电池簇控制电路601处于导通状态，第一检测电路603检测到储能系统的漏电流小于或等于预设安全阈值，则可以认为电池簇600没有发生漏电故障，控制器604进一步控制第二功率开关单元6051导通，即控制闭合点4闭合，导通电池簇控制电路601与第二功率开关单元6051的连接。此时，第三连接开关单元6052和第一功率变换电路602还是处于关断状态。
S805、控制器604判断第一检测电路603检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路601和第二功率开关单元6051处于导通状态，若第一检测电路603检测到储能系统的漏电流大于预设安全阈值，控制器604执行步骤S806a，否则控制器604执行步骤S806b。
S806a、控制器604发送电池簇控制电路601发生漏电故障的告警信息。具体实现中，由于控制器604是在执行步骤S804b之后，即控制器604排除电池簇600出现漏电故障的可能，进一步控制第二功率开关单元6051导通，此时第一检测电路603检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是电池簇控制电路601引起的，控制器604确定电池簇控制电路601发生漏电故障，并发送电池簇控制电路发生漏电故障的告警信息。例如，控制器604向该显示装置发送5，5代表电池簇控制电路601发生漏电故障。进一步的，该显示装置显示5，指示电池簇控制电路601发生漏电故障。或者，控制器104可以将电池簇控制电路601的告警信息发送至云服务器，该云服务器可以对电池簇100漏电故障的情况进行标记和处理。
S806b、控制器604控制第三连接开关单元6052导通。此时，电池簇控制电路601和第一功率开关单元6051处于导通状态，第一检测电路603检测到储能系统的漏电流小于或等于预设安全阈值，则可以认 为电池簇600和电池簇控制电路601没有发生漏电故障，控制器604进一步控制第三连接开关单元6052导通。
S807、控制器604判断第一检测电路603检测到储能系统的漏电流是否大于预设安全阈值。此时，电池簇控制电路601、第二功率开关单元6051和第三连接开关单元6052处于导通状态，若第一检测电路603检测到储能系统的漏电流大于预设安全阈值，控制器604执行步骤S808a，否则控制器604执行步骤S808b。
S808a、控制器604发送第二功率变换电路605发生漏电故障的告警信息。具体实现中，由于控制器604是在执行步骤S806b之后，即控制器604排除电池簇控制电路601出现漏电故障的可能，进一步控制第三连接开关单元6052导通，此时第一检测电路603检测到储能系统的漏电流大于预设安全阈值，则可以认为储能系统的漏电流是第二功率变换电路605引起的，控制器604确定第二功率变换电路605发生漏电故障，并发送第二功率变换电路发生漏电故障的告警信息。可选的，控制器604向显示装置发送第二功率变换电路发生漏电故障的告警信息，例如，控制器604向显示装置发送6，6代表第二功率变换电路605发生漏电故障。进一步的，该显示装置显示6，指示第二功率变换电路605发生漏电故障。或者，控制器604可以将第二功率变换电路605发生漏电故障的告警信息发送至云服务器，此时该云服务器可以对第二功率变换电路605发生漏电故障的情况进行标记和处理。
S808b、控制器604控制第一连接开关单元导通。此时控制器604可以执行图4中示出的故障定位方法，具体实现方式可以结合图4所描述的实施例，此处不作赘述。
本申请实施例中，在电池簇控制电路与第一功率变换电路之间增加第二功率变换电路，可以增强该储能系统的适应性，该第二功率变换电路和第一功率变换电路可以对电池簇的输出电压或输入电压进行两级变换，使得该储能系统可以适用更多场景。实施本申请实施例，可以在设有第二功率变换电路的储能系统出现漏电故障时，对储能系统的漏电故障进行定位。
需要说明的是，上述术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (16)

  1. 一种储能系统，其特征在于，所述储能系统包括电池簇、电池簇控制电路、第一功率变换电路、第一检测电路以及控制器，所述电池簇连接所述电池簇控制电路的一端，所述电池簇控制电路的另一端连接所述第一功率变换电路的一端，所述第一功率变换电路的另一端用于连接电网或负载，所述第一检测电路设于所述第一功率变换电路与所述电网或负载之间；
    所述控制器，用于在所述第一检测电路检测到所述储能系统的漏电流大于预设安全阈值的情况下，控制所述电池簇控制电路和所述第一功率变换电路关断；
    所述控制器，还用于在控制所述电池簇控制电路和所述第一功率变换电路关断之后，控制所述电池簇控制电路导通，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述电池簇发生漏电故障的告警信息。
  2. 根据权利要求1所述的储能系统，其特征在于，所述第一功率变换电路包括第一连接开关单元，所述第一连接开关单元用于连接所述电池簇控制电路；
    所述控制器，还用于在所述电池簇控制电路导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第一连接开关单元导通；
    所述控制器，还用于在所述第一连接开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述电池簇控制电路与所述第一功率变换电路之间的回路发生漏电故障的告警信息。
  3. 根据权利要求2所述的储能系统，其特征在于，所述第一功率变换电路还包括第一功率开关单元，所述第一功率开关单元设于所述第一连接开关单元与所述第一检测电路之间；
    所述控制器，还用于在所述第一连接开关单元导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第一功率开关单元导通；
    所述控制器，还用于在所述第一功率开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述第一功率变换电路发生漏电故障的告警信息。
  4. 根据权利要求2-3任一项所述的储能系统，其特征在于，所述第一功率变换电路还包括第二连接开关单元，所述第二连接开关单元设于所述第一功率开关单元与所述第一检测电路之间；
    所述控制器，还用于在所述第一功率开关单元导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第二连接开关单元导通；
    所述控制器，还用于在所述第二连接开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值的情况下，发送所述第一功率变换电路与所述电网或负载之间的回路发生漏电故障的告警信息。
  5. 根据权利要求2-4任一项所述的储能系统，其特征在于，所述储能系统还包括第二功率变换电路，所述第二功率变换电路设于所述电池簇控制电路与所述第一连接开关单元之间；
    所述功率变换电路包括第二功率开关单元，所述第二功率开关单元用于对所述电池簇的输入电压或输出电压进行变换；
    所述控制器，还用于在所述电池簇控制电路导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，在控制所述第一连接开关单元导通之前，控制所述第二功率开关单元导通；
    所述控制器，还用于在所述第二功率开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述电池簇控制电路发生漏电故障的告警信息。
  6. 根据权利要求5所述的储能系统，其特征在于，所述第二功率变换电路还包括第三连接开关单元，所述第三连接开关单元用于连接所述第一连接开关单元；
    所述控制器，还用于在所述第二功率开关单元导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第三连接开关单元导通；
    所述控制器，还用于在所述第三连接开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述第二功率变换电路发生漏电故障的告警信息。
  7. 根据权利要求1-6任一项所述的储能系统，其特征在于，所述储能系统还包括第二检测电路，所述第二检测电路设于所述电池簇与所述电池簇控制电路之间；
    所述控制器，还用于在所述第二检测电路检测到所述电池簇的漏电流大于电池安全电流的情况下，发送所述电池簇发生漏电故障的告警信息。
  8. 根据权利要求7所述的储能系统，其特征在于，所述控制器，还用于在所述电池簇未发生漏电故障的情况下，基于所述第二检测电路检测到所述电池簇的漏电流对所述预设安全阈值进行更新。
  9. 一种储能系统的漏电故障定位方法，所述储能系统包括电池簇、电池簇控制电路、第一功率变换电路以及第一检测电路，其特征在于，
    所述电池簇连接所述电池簇控制电路的一端，所述电池簇控制电路的另一端连接所述第一功率变换电路的一端，所述第一功率变换电路的另一端用于连接电网或负载；所述第一检测电路设于所述第一功率变换电路与所述电网或负载之间；
    所述漏电故障定位方法包括：
    在所述第一检测电路检测到所述储能系统的漏电流大于预设安全阈值的情况下，控制所述电池簇控制电路和所述第一功率变换电路关断；
    在控制所述电池簇控制电路和所述第一功率变换电路关断之后，控制所述电池簇控制电路导通，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述电池簇发生漏电故障的告警信息。
  10. 根据权利要求9所述的漏电故障定位方法，其特征在于，所述第一功率变换电路包括第一连接开关单元，所述第一连接开关单元用于连接所述电池簇控制电路；
    所述漏电故障定位方法还包括：
    在控制所述电池簇控制电路导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第一连接开关单元导通；
    在所述第一连接开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述电池簇与所述第一功率变换电路之间的回路发生漏电故障的告警信息。
  11. 根据权利要求10所述的漏电故障定位方法，其特征在于，所述第一功率变换电路还包括第一功率开关单元，所述第一功率开关单元设于所述第一连接开关单元与所述第一检测电路之间；
    所述漏电故障定位方法还包括：
    在所述第一连接开关单元导通，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第一功率开关单元导通；
    在所述第一功率开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述第一功率变换电路发生漏电故障的告警信息。
  12. 根据权利要求10-11任一项所述的漏电故障定位方法，其特征在于，所述第一功率变换电路还包括第二连接开关单元，所述第二连接开关单元设于所述第一功率开关单元与所述第一检测电路之间；
    所述漏电故障定位方法还包括：
    在所述第一功率开关单元导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第二连接开关单元导通；
    在所述第二连接开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述第一功率变换电路与所述电网或负载之间的回路发生漏电故障的告警信息。
  13. 根据权利要求10-12任一项所述的漏电故障定位方法，其特征在于，所述储能系统还包括第二功率变换电路，所述第二功率变换电路设于所述电池簇控制电路与所述第一连接开关单元之间；
    所述功率变换电路还包括第二功率开关单元，所述第二功率开关单元用于对所述电池簇的输入电压或输出电压进行变换；
    所述漏电故障定位方法还包括：
    在所述电池簇控制电路导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，在控制所述第一连接开关单元导通之前，控制所述第二功率开关单元导通；
    在所述第二功率开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述电池簇控制电路发生漏电故障的告警信息。
  14. 根据权利要求13所述的漏电故障定位方法，其特征在于，所述第二功率变换电路还包括第三连接开关单元，所述第三连接开关单元用于连接所述第一连接开关单元；
    所述漏电故障定位方法还包括：
    在所述第二功率开关单元导通的情况下，若所述第一检测电路检测到所述储能系统的漏电流小于或等于所述预设安全阈值，控制所述第三连接开关单元导通；
    在所述第三连接开关单元导通的情况下，基于所述第一检测电路检测到所述储能系统的漏电流大于所述预设安全阈值，发送所述第二功率变换电路发生漏电故障的告警信息。
  15. 根据权利要求9-14任一项所述的漏电故障定位方法，其特征在于，所述储能系统还包括第二检测电路，所述第二检测电路设于所述电池簇与所述电池簇控制电路之间；
    所述漏电故障定位方法还包括：
    在所述第二检测电路检测到所述电池簇的漏电流大于电池安全电流的情况下，发送所述电池簇发生漏电故障的告警信息。
  16. 根据权利要求15所述的漏电故障定位方法，其特征在于，所述漏电故障定位方法还包括：
    在所述电池簇未发生漏电故障的情况下，基于所述第二检测电路检测到所述电池簇的漏电流对所述预设安全阈值进行更新。
PCT/CN2023/142962 2023-03-09 2023-12-28 一种储能系统及其漏电故障定位方法 Ceased WO2024183428A1 (zh)

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