Energy storage system, control method for energy storage system, computer device, and storage medium

Abstract

The present application relates to an energy storage system, a control method for the energy storage system, a computer device, and a storage medium. The energy storage system comprises a controller, an energy storage circuit and a switching device; the controller is connected to the energy storage circuit and the switching device; the switching device comprises a first switching circuit, a second switching circuit and a third switching circuit; the energy storage circuit comprises a first energy storage sub-circuit and a second energy storage sub-circuit which are connected in series; the two ends of the first switching circuit are respectively connected to a negative electrode of the first energy storage sub-circuit and a positive electrode of the second energy storage sub-circuit; the two ends of the second switching circuit are respectively connected to a positive electrode of the first energy storage sub-circuit and the positive electrode of the second energy storage sub-circuit; and the two ends of the third switching circuit are respectively connected to the negative electrode of the first energy storage sub-circuit and a negative electrode of the second energy storage sub-circuit. According to the present application, the mode of switching the energy storage circuit on the basis of the switching device can reduce the installation and test workload of the energy storage system.

Description

Energy storage system, control method of energy storage system, computer device and storage medium

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2023115273481, filed on November 15, 2023, entitled “Energy Storage System, Control Method of Energy Storage System, Computer Device and Storage Medium,” the entire text of which is incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of energy storage systems, and in particular to an energy storage system, a control method for an energy storage system, a computer device, and a storage medium. Background Art

[0004] At present, with the application and development of power electronics technology and battery technology in power systems, energy storage systems are widely used in the construction of new power series because of their advantages such as peak-shaving and frequency regulation and facilitation of renewable energy grid connection.

[0005] Before the energy storage system is actually put into operation, it must be installed on a test platform to verify its long-term operating capacity, overload capacity, and the working conditions of each energy storage module. The control system and fault protection functions of each module are also tested. After the tests are completed, the energy storage system is removed from the test platform and installed on the actual operation platform.

[0006] Since the high-voltage energy storage module is large in size and has many stages, disassembling and installing the energy storage system between the test operation platform and the actual operation platform results in a large installation and testing workload.

[0007] Summary of the Invention

[0008] Based on this, it is necessary to provide an energy storage system, a control method for the energy storage system, a computer device and a storage medium that can reduce the installation and testing workload in order to address the above technical problems.

[0009] In a first aspect, the present application provides an energy storage system, the energy storage system including a controller, an energy storage circuit, and a switch device, wherein the controller is connected to the energy storage circuit and the switch device, and the switch device includes a first switch circuit, a second switch circuit, and a third switch circuit;

[0010] The energy storage circuit includes a first energy storage subcircuit and a second energy storage subcircuit connected in series, the first energy storage subcircuit and the second energy storage subcircuit each include an energy storage device, the energy storage device includes an energy storage module or at least two energy storage modules connected in series, the energy storage module includes a power unit and an energy storage unit connected in parallel with the power unit;

[0011] The two ends of the first switch circuit are respectively connected to the negative electrode of the first energy storage sub-circuit and the positive electrode of the second energy storage sub-circuit, the two ends of the second switch circuit are respectively connected to the positive electrode of the first energy storage sub-circuit and the positive electrode of the second energy storage sub-circuit, and the two ends of the third switch circuit are respectively connected to the negative electrode of the first energy storage sub-circuit and the negative electrode of the second energy storage sub-circuit.

[0012] In the technical solution of the embodiment of the present application, before the energy storage circuit is in the test operation mode, the energy storage circuit can be in the actual operation working mode or in other modes such as the unpowered mode. If the energy storage circuit needs to be tested, the first switch circuit of the control switch device is turned off, and the second switch circuit and the third switch circuit are turned on, so that the energy storage circuit can be put into the test operation mode, and the working condition of the test circuit in the energy storage circuit can be tested. If there is no need to test the energy storage circuit, the first switch circuit of the control switch device is turned on, and the second switch circuit and the third switch circuit are turned off, so that the energy storage circuit can be put into the actual operation mode. Therefore, there is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, which can reduce the installation and testing workload of the energy storage system.

[0013] In some embodiments, the energy storage circuit further includes a circuit breaker, wherein a first end of the circuit breaker is connected between the second switching circuit and the positive pole of the first energy storage sub-circuit, and a second end of the circuit breaker is connected to the high-voltage positive bus, and / or, a first end of the circuit breaker is connected between the third switching circuit and the negative pole of the second energy storage sub-circuit, and a second end of the circuit breaker is connected to the high-voltage negative bus.

[0014] In the technical solution of the embodiment of the present application, the energy storage circuit and the high-voltage bus are connected through a circuit breaker, so that the controller can switch the energy storage circuit to the test operation mode and the grid-connected operation mode by controlling the second switch circuit and / or the third switch circuit. There is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, which can reduce the installation and testing workload of the energy storage system.

[0015] In some embodiments, the energy storage circuit further includes a reactor, which is connected in series to the positive electrode of the first energy storage sub-circuit and / or the negative electrode of the second energy storage sub-circuit.

[0016] In an embodiment of the present application, the short-circuit current of the first energy storage sub-circuit and the second energy storage sub-circuit is limited by the inductor, the voltage distribution on the first energy storage sub-circuit and the second energy storage sub-circuit is improved, and the high-order harmonics are limited and the harmonic interference is reduced, thereby realizing the regulation of the voltage and current on the first energy storage sub-circuit and the second energy storage sub-circuit.

[0017] In some embodiments, the first energy storage subcircuit includes a companion test circuit, and the companion test circuit includes at least one energy storage module or at least one valve section in the first energy storage subcircuit;

[0018] The second energy storage sub-circuit includes a tested circuit, and the tested circuit includes at least one energy storage module or at least one valve section in the second energy storage sub-circuit.

[0019] In the technical solution of the embodiment of the present application, since the accompanying test circuit includes at least one energy storage module or at least one valve section in the first energy storage sub-circuit, and the tested circuit includes at least one energy storage module or at least one valve section in the second energy storage sub-circuit, various forms of testing of the energy storage system can be achieved. Not only can a single energy storage module be tested, but also a valve section can be tested. Moreover, the test equipment can use the control and protection, reactors, measuring equipment, water cooling and background equipment of actual engineering, without the need to add additional equipment, thereby reducing the test cost.

[0020] In some embodiments, the energy storage system further includes an energy charging circuit connected to the controller and the energy storage circuit.

[0021] In some embodiments, the energy replenishment circuit includes a power supply and a fourth switch circuit, and the fourth switch circuit is connected to the power supply and the controller.

[0022] In the technical solution of the embodiment of the present application, the energy replenishment circuit includes a power supply and a fourth switching circuit. The implementation method of the energy replenishment circuit is simple. The controller can control the power supply based on the fourth switching circuit to charge the module that needs energy replenishment, and the control method is easy to implement.

[0023] In a second aspect, the present application provides a control method for an energy storage system, which is applied to the energy storage system according to any one of the first aspects, and includes:

[0024] Controlling the first switch circuit to be turned off, and controlling the second switch circuit and the third switch circuit to be turned on, so as to control the first energy storage sub-circuit and the second energy storage sub-circuit to form a target loop;

[0025] When the first energy storage sub-circuit and the second energy storage sub-circuit form a target loop, the working condition of the tested circuit in the energy storage circuit is tested; the tested circuit includes the first energy storage sub-circuit or the second energy storage sub-circuit.

[0026] In some embodiments, when the first energy tank sub-circuit and the second energy tank sub-circuit form a target loop, testing the operation of the test circuit in the energy tank circuit includes:

[0027] Get the actual current parameters of the target circuit;

[0028] Based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested.

[0029] In the technical solution of the embodiment of the present application, the actual current parameters are determined based on the actual current parameters and the preset test current parameters of the test circuit, thereby completing the test of the working condition of the test circuit, making the test of the working condition of the test circuit more accurate.

[0030] In some embodiments, based on the actual current parameter and the preset test current parameter of the test circuit, testing the working condition of the test circuit includes:

[0031] If the actual current value of the target circuit is inconsistent with the test current value included in the preset test current parameters, the number of energy storage modules in the accompanying test circuit in the energy storage circuit is adjusted, and / or the input duration is adjusted to adjust the duty cycle of the energy storage modules input to test the working condition of the test circuit.

[0032] In the technical solution of the embodiment of the present application, when the actual current value is inconsistent with the test current value, the duty cycle of the energy storage modules put into operation is adjusted by adjusting the number of energy storage modules put into operation in the test circuit and / or adjusting the time for putting the energy storage modules into operation, so as to test the working condition of the test circuit more accurately.

[0033] In some embodiments, the method further comprises:

[0034] If the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency included in the preset test current parameters, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the accompanying test circuit to test the working condition of the test circuit.

[0035] In the technical solution of the embodiment of the present application, when the actual current fluctuation frequency is inconsistent with the test current fluctuation frequency, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the test circuit to test the working condition of the test circuit, so that the working condition of the test circuit is tested more accurately.

[0036] In some embodiments, the method further comprises:

[0037] The switching of the energy storage module in the test circuit is controlled according to the test current duty cycle included in the preset test current parameters to test the working condition of the test circuit.

[0038] In the technical solution of the embodiment of the present application, the switching of the test module in the test module is directly controlled according to the test current duty cycle to simulate the actual working conditions, so as to test the working conditions of the test circuit, making the test of the working conditions of the test circuit more accurate.

[0039] In some embodiments, the method further comprises:

[0040] The first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the target loop state to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit.

[0041] In the technical solution of the embodiment of the present application, the first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the test operation mode to the actual operation mode. This eliminates the need to disassemble the energy storage system multiple times to put the energy storage system into the actual operation mode, thereby solving the problem of heavy workload in installing and testing the energy storage system and reducing the time cost of testing the energy storage system. At the same time, since the energy storage system can be switched from the test operation mode to the actual operation mode, there is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, and there is no need to prepare a separate set of supporting equipment for the test operation platform, thereby saving test costs. Among them, the supporting equipment includes, for example, control and protection equipment, reactors, measuring equipment, water cooling and background equipment.

[0042] In some embodiments, the energy storage system further includes an energy compensation circuit connected to the controller and the energy storage circuit; the method further includes:

[0043] Obtain the state of charge of the energy storage module;

[0044] An energy storage module corresponding to a state of charge less than a preset state of charge is determined as a target module, and an energy replenishment circuit is controlled to charge the target module.

[0045] In the technical solution of the embodiment of the present application, an energy compensation circuit is used to charge the energy storage module corresponding to a charge state less than a preset charge state, so that the charge state of the energy storage module in the accompanying test circuit and the energy storage module in the tested circuit meet the preset charge state, laying the foundation for subsequent testing of the working condition of the tested circuit in the energy storage circuit based on the test operation mode.

[0046] In some embodiments, the energy replenishment circuit includes a power supply and a fourth switch circuit, and the fourth switch circuit is connected to the power supply and the controller;

[0047] Controlling the energy replenishment circuit to charge the target module includes:

[0048] The fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using the power supply.

[0049] In the technical solution of the embodiment of the present application, when the fourth switch circuit is turned on, the power supply is used to charge the target module. The implementation method of the energy replenishment circuit is simple. The controller controls the power supply to charge the target module based on the fourth switch circuit, and the control method is easy to implement.

[0050] In a third aspect, the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method provided in the above embodiment when executing the computer program.

[0051] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method provided in the above embodiment.

[0052] In a fifth aspect, the present application further provides a computer program product, which includes a computer program that implements the steps of the method provided in the above embodiment when executed by a processor.

[0053] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the optional implementation methods of the present application are specifically listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the optional embodiments below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0055] FIG1 is a first structural diagram of an energy storage system provided in an embodiment of the present application;

[0056] FIG2 is a second structural diagram of the energy storage system provided in an embodiment of the present application;

[0057] FIG3 is a third structural diagram of the energy storage system provided in an embodiment of the present application;

[0058] FIG4 is a fourth structural diagram of the energy storage system provided in an embodiment of the present application;

[0059] FIG5 is a fifth structural diagram of the energy storage system provided in an embodiment of the present application;

[0060] FIG6 is a sixth structural diagram of the energy storage system provided in an embodiment of the present application;

[0061] FIG7 is a flow chart of a control method for an energy storage system according to an embodiment of the present application;

[0062] FIG8 is a flow chart of another method for controlling an energy storage system provided in an embodiment of the present application;

[0063] FIG9 is a diagram showing the internal structure of a computer device in one embodiment.

[0064] Explanation of the accompanying symbols: 100, energy storage system; 10, controller; 20, energy storage circuit; 30, switching device; 201, first energy storage sub-circuit; 202, second energy storage sub-circuit; 40, circuit breaker; 50, reactor; 60, energy compensation circuit; K1, first switching circuit; K2, second switching circuit; K3, third switching circuit; 601, power supply; K4, fourth switching circuit. DETAILED DESCRIPTION

[0065] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing embodiments in some embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0067] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0068] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0069] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0070] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0071] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0072] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0073] Before the energy storage system is put into actual operation, it must be installed on a test platform to verify its long-term operating capacity and overload capability. After the test is completed, the energy storage system is removed from the test platform and installed on the actual operation platform. However, the energy storage modules are large and have many stages, so the installation and testing workload of disassembling and installing the energy storage system between the test platform and the actual operation platform is high.

[0074] In order to solve the above problems, the present application provides an energy storage system, a control method for an energy storage system, a computer device and a storage medium. In the energy storage system provided by the present application, before the energy storage circuit is in the test operation mode, the energy storage circuit can be in the actual operation working mode or in other modes such as the unpowered mode. If the energy storage circuit needs to be tested, the first switch circuit of the control switch device is turned off, and the second switch circuit and the third switch circuit are turned on, so that the energy storage circuit can be placed in the test operation mode, and the working condition of the test circuit in the energy storage circuit can be tested. If there is no need to test the energy storage circuit, the first switch circuit of the control switch device is turned on, and the second switch circuit and the third switch circuit are turned off, so that the energy storage circuit can be placed in the actual operation mode. Therefore, there is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, which can reduce the installation and testing workload of the energy storage system.

[0075] FIG1 is a first structural diagram of an energy storage system provided in an embodiment of the present application. As shown in FIG1 , the energy storage system includes a controller 10, an energy storage circuit 20, and a switch device 30. The controller 10 is connected to the energy storage circuit 20 and the switch device 30. The switch device 30 includes a first switch circuit K1, a second switch circuit K2, and a third switch circuit K3. The energy storage circuit 20 includes a first energy storage sub-circuit 201 and a second energy storage sub-circuit 202 connected in series. The first energy storage sub-circuit 201 and the second energy storage sub-circuit 202 each include an energy storage device. The energy storage device includes an energy storage module or at least two energy storage modules connected in series, and the energy storage module includes a power unit and an energy storage unit connected in parallel with the power unit; the two ends of the first switch circuit K1 are respectively connected to the negative electrode of the first energy storage sub-circuit 201 and the positive electrode of the second energy storage sub-circuit 202, the two ends of the second switch circuit K2 are respectively connected to the positive electrode of the first energy storage sub-circuit 201 and the positive electrode of the second energy storage sub-circuit 202, and the two ends of the third switch circuit K3 are respectively connected to the negative electrode of the first energy storage sub-circuit 201 and the negative electrode of the second energy storage sub-circuit 202.

[0076] In an embodiment of the present application, as shown in FIG1 , an energy storage system 100 includes a controller 10, an energy storage circuit 20, and a switching device 30. The controller 10 is connected to the energy storage circuit 20 and the switching device 30, and the switching device 30 is also connected to the energy storage circuit 20. The switching device 30 includes a first switching circuit K1, a second switching circuit K2, and a third switching circuit K3. The first switching circuit K1 has its two terminals connected to the negative electrode of the first energy storage sub-circuit 201 and the positive electrode of the second energy storage sub-circuit 202, respectively. The second switching circuit K2 has its two terminals connected to the positive electrode of the first energy storage sub-circuit 201 and the positive electrode of the second energy storage sub-circuit 202, respectively. The third switching circuit K3 has its two terminals connected to the negative electrode of the first energy storage sub-circuit 201 and the negative electrode of the second energy storage sub-circuit 202, respectively.

[0077] Energy storage circuit 20 includes a first energy storage subcircuit 201 and a second energy storage subcircuit 202 connected in series. Each of first and second energy storage subcircuit 201 and 202 includes an energy storage device, which includes one energy storage module or at least two energy storage modules connected in series. For example, first energy storage subcircuit 201 includes energy storage modules SM1, SM2, and SM3, while second energy storage subcircuit 202 includes energy storage modules SM4, SM5, and SM6.

[0078] In some embodiments, the energy storage system may further include a switch module. The switch module and the switch device 30 divide the energy storage circuit 20 into a first energy storage sub-circuit, a second energy storage sub-circuit, and a third energy storage sub-circuit.

[0079] The controller 10 can place the energy storage system 100 in different operating modes by controlling the switch device 30. For example, when the controller 10 controls the first switch circuit K1 to be disconnected and the second switch circuit K2 and the third switch circuit K3 to be connected, the first energy storage sub-circuit 201 and the second energy storage sub-circuit 202 can be controlled to form a target loop, that is, the energy storage circuit 20 is controlled to be in a test operation mode. When the controller 10 controls the first switch circuit K1 to be connected and the second switch circuit K2 and the third switch circuit K3 to be disconnected, the state of the series circuit formed by the first energy storage sub-circuit 201 and the second energy storage sub-circuit 202 can be controlled, that is, the energy storage circuit 20 is controlled to be in a non-test operation mode.

[0080] In some embodiments, the controller 10 can also simultaneously control the first switch circuit K1 , the second switch circuit K2 , the third switch circuit K3 and the switch module in the switch device 30 to put the energy storage system 100 into different operating modes.

[0081] In some embodiments, the first energy storage sub-circuit 201 can be the upper half or the lower half located above the switching device 30. If the first energy storage sub-circuit 201 is the upper half located above the switching device 30, the second energy storage sub-circuit 202 is the lower half located below the switching device 30; if the first energy storage sub-circuit 201 is the lower half located above the switching device 30, the second energy storage sub-circuit 202 is the upper half located above the switching device 30.

[0082] In some embodiments, the energy storage module can be an energy storage module composed of a half-bridge module or an energy storage module composed of a full-bridge module. The energy storage module shown in Figure 1 is a half-bridge module. Figure 2 is a second structural schematic diagram of the energy storage system 100 provided in an embodiment of the present application. The energy storage module shown in Figure 2 is a full-bridge module. Both the half-bridge module and the full-bridge module can be based on modules composed of DC capacitors and insulated gate bipolar transistors (IGBTs).

[0083] In some embodiments, the first switch circuit K1 , the second switch circuit K2 , and the third switch circuit K3 may all be single-pole double-throw switches, circuit breakers, transistors, fuses, and the like.

[0084] In some embodiments, the controller 10 may include a central processing unit (CPU), a field programmable gate array (FPGA), a complex programmable logic device (CPLD), a digital signal processing (DSP), a single-chip microcomputer, and other controllers.

[0085] In the technical solution of the embodiment of the present application, before the energy storage circuit is in the test operation mode, the energy storage circuit can be in the actual operation working mode or in other modes such as the unpowered mode. If the energy storage circuit needs to be tested, the first switch circuit of the control switch device is turned off, and the second switch circuit and the third switch circuit are turned on, so that the energy storage circuit can be put into the test operation mode, and the working condition of the test circuit in the energy storage circuit can be tested. If there is no need to test the energy storage circuit, the first switch circuit of the control switch device is turned on, and the second switch circuit and the third switch circuit are turned off, so that the energy storage circuit can be put into the actual operation mode. Therefore, there is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, which can reduce the installation and testing workload of the energy storage system.

[0086] Figure 3 is a third structural schematic diagram of the energy storage system provided in an embodiment of the present application. As shown in Figure 3, the energy storage circuit also includes a circuit breaker 40, a first end of the circuit breaker 40 is connected between the second switch circuit K2 and the positive electrode of the first energy storage sub-circuit 201, and a second end of the circuit breaker 40 is connected to the high-voltage positive bus, and / or, a first end of the circuit breaker 40 is connected between the third switch circuit K3 and the negative electrode of the second energy storage sub-circuit 202, and a second end of the circuit breaker 40 is connected to the high-voltage negative bus.

[0087] In some embodiments, the energy storage system may include only one circuit breaker or two circuit breakers 40. If the energy storage system includes only one circuit breaker 40, the circuit breaker 40 may be positioned above the first energy storage sub-circuit 201. In this case, the first end of the circuit breaker 40 is connected between the second switch circuit K2 and the positive electrode of the first energy storage sub-circuit 201, and the second end of the circuit breaker 40 is connected to the positive electrode of the high-voltage bus. Alternatively, the circuit breaker 40 may be positioned below the second energy storage sub-circuit 202. In this case, the first end of the circuit breaker 201 is connected between the third switch circuit K3 and the negative electrode of the second energy storage sub-circuit 202, and the second end of the circuit breaker 40 is connected to the negative electrode of the high-voltage bus.

[0088] In an embodiment of the present application, when the energy storage system includes two circuit breakers, as shown in Figure 3, the circuit breaker 40 includes a first circuit breaker and a second circuit breaker, and the circuit breaker and the reactor located above the first energy storage sub-circuit 201 in Figure 3 are used as the first circuit breaker and the first reactor, and the circuit breaker and the reactor below the second energy storage sub-circuit 202 are used as the second circuit breaker and the second reactor.

[0089] The first end of the first circuit breaker is connected between the second switch circuit K2 and the positive pole of the first energy storage sub-circuit 201, and the second end of the first circuit breaker is connected to the positive pole of the high-voltage bus; the first end of the second circuit breaker is connected between the third switch circuit K3 and the negative pole of the second energy storage sub-circuit 202, and the second end of the second circuit breaker is connected to the negative pole of the high-voltage bus.

[0090] When the first circuit breaker, the second circuit breaker and the first switch circuit K1 are turned off, and the second switch circuit K2 and the third switch circuit K3 are turned on, the current passes through the energy storage module SM4, the energy storage module SM5 and the energy storage module SM6 in the second energy storage sub-circuit 202, and flows to the energy storage module SM3, the energy storage module SM2 and the energy storage module SM1 in the first energy storage sub-circuit 201, controlling the first energy storage sub-circuit 201 and the second energy storage sub-circuit 202 to form a target loop, that is, controlling the energy storage circuit to be in the test operation mode.

[0091] When the first circuit breaker, the second circuit breaker and the first switch circuit K1 are turned on, and the second switch circuit K2 and the third switch circuit K3 are turned off, the current passes through the energy storage module SM1, the energy storage module SM2 and the energy storage module SM3 in the first energy storage sub-circuit 201, and flows to the energy storage module SM4, the energy storage module SM5 and the energy storage module SM6 in the second energy storage sub-circuit 202, controlling the energy storage circuit to switch from the state of the target loop to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit, that is, controlling the energy storage circuit to be in a non-test operation mode.

[0092] In the technical solution of the embodiment of the present application, the energy storage circuit and the high-voltage bus are connected through a circuit breaker, so that the controller can switch the energy storage circuit to the test operation mode and the grid-connected operation mode by controlling the second switch circuit and / or the third switch circuit. There is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, which can reduce the installation and testing workload of the energy storage system.

[0093] According to some embodiments of the present application, as shown in FIG3 , the energy storage circuit further includes a reactor 50 , which is connected in series to the positive electrode of the first energy storage sub-circuit and / or the negative electrode of the second energy storage sub-circuit.

[0094] Similarly, the energy storage system may include only one reactor 50 or two reactors 50. If the energy storage system includes only one reactor 50, the reactor 50 may be disposed above the first energy storage sub-circuit 201. In this case, the reactor 50 is connected in series between the positive electrode of the first energy storage sub-circuit 201 and the positive electrode of the second energy storage sub-circuit 201. The reactor 50 may also be disposed below the second energy storage sub-circuit 202. In this case, the reactor 50 is connected in series between the negative electrode of the first energy storage sub-circuit 201 and the negative electrode of the second energy storage sub-circuit 202.

[0095] In the embodiment of the present application, the energy storage system includes two reactors 50, as shown in Figure 3. The reactor 50 includes a first reactor and a second reactor. The reactor located above the first energy storage sub-circuit 201 in Figure 3 is referred to as the first reactor, and the reactor below the second energy storage sub-circuit 202 is referred to as the second reactor.

[0096] The first reactor is connected in series between the positive electrode of the first energy storage sub-circuit 202 and the positive electrode of the second energy storage sub-circuit 202 through the second switch circuit K2, and the second reactor is connected in series between the negative electrode of the first energy storage sub-circuit 201 and the negative electrode of the second energy storage sub-circuit 202 through the third switch circuit K3.

[0097] In the technical solution of the embodiment of the present application, the short-circuit current of the first energy storage sub-circuit and the second energy storage sub-circuit is limited by the inductor, the voltage distribution on the first energy storage sub-circuit and the second energy storage sub-circuit is improved, and the high-order harmonics are limited and the harmonic interference is reduced, thereby realizing the regulation of the voltage and current on the first energy storage sub-circuit and the second energy storage sub-circuit.

[0098] According to some embodiments of the present application, the first energy storage sub-circuit includes a test circuit, which includes at least one energy storage module or at least one valve section in the first energy storage sub-circuit; the second energy storage sub-circuit includes a tested circuit, which includes at least one energy storage module or at least one valve section in the second energy storage sub-circuit.

[0099] The first energy storage subcircuit includes a test circuit, and the second energy storage subcircuit includes a test circuit. The controller controls the first circuit breaker, the second circuit breaker, and the first switch circuit K1 to be turned off, and controls the second switch circuit K2 and the third switch circuit K3 to be turned on. This can control the energy storage module in the first energy storage subcircuit to be put into operation as the energy storage module in the test circuit, and control the energy storage module in the second energy storage subcircuit to be put into the test circuit as the energy storage module in the test circuit. For example, energy storage module SM1 can be put into operation, energy storage modules SM2 and SM3 can be bypassed, and energy storage module SM1 can be used as the energy storage module in the test circuit. Energy storage modules SM4 and SM5 can be put into operation, energy storage module SM6 can be bypassed, and energy storage modules SM4 and SM5 can be used as the energy storage modules in the test circuit.

[0100] In the embodiments of the present application, the accompanying test circuit and the tested circuit may each include one energy storage module, or may include multiple energy storage modules. That is, the accompanying test circuit and the tested circuit may be directly composed of one energy storage module, or may be composed of one valve section (multiple energy storage modules). They may also be composed of multiple valve sections, that is, each of the multiple valve sections includes one energy storage module, or each of the multiple valve sections includes multiple energy storage modules.

[0101] In the technical solution of the embodiment of the present application, since the accompanying test circuit includes at least one energy storage module or at least one valve section in the first energy storage sub-circuit, and the tested circuit includes at least one energy storage module or at least one valve section in the second energy storage sub-circuit, various forms of testing of the energy storage system can be achieved. Not only can a single energy storage module be tested, but also a valve section can be tested. Moreover, the test equipment can use the control and protection, reactors, measuring equipment, water cooling and background equipment of actual engineering, without the need to add additional equipment, thereby reducing the test cost.

[0102] FIG4 is a fourth structural diagram of the energy storage system provided in an embodiment of the present application. As shown in FIG4 , the energy storage system 100 further includes an energy replenishment circuit 60, which is connected to the controller 10 and the energy storage circuit 20. In an embodiment of the present application, as shown in FIG4 , the energy storage system 100 further includes an energy replenishment circuit 60, which is connected to the controller 10 and the energy storage circuit 20. The energy replenishment circuit 60 may include multiple energy replenishment units, one energy replenishment unit corresponding to each test module, and each energy replenishment unit is connected in parallel with a test module. For example, the one energy replenishment unit is connected in parallel with a test module. Alternatively, the energy replenishment circuit 60 may include one energy replenishment unit, which is connected in parallel with all test modules.

[0103] In some embodiments, the energy compensation circuit 60 may be a circuit composed of a constant current source, an AC regulated power supply, a DC regulated power supply, an inverter regulated power supply, a switching regulated power supply, etc.

[0104] According to some embodiments of the present application, Figure 5 is a fifth schematic diagram of the energy storage system provided in embodiments of the present application, and Figure 6 is an eighth schematic diagram of the energy storage system provided in embodiments of the present application. As shown in Figures 5 and 6, the energy compensation circuit 60 includes a power supply 601 and a fourth switch circuit K4, which is connected to the power supply 601 and the controller.

[0105] In an embodiment of the present application, the energy charging circuit includes a power supply 601 and a fourth switch circuit K4. According to the above embodiment, each energy charging unit may include a power supply 601 and a fourth switch circuit K4, so that the controller controls the fourth switch circuit K4 corresponding to the module that needs energy charging to be turned on, and uses the power supply 601 corresponding to the module that needs energy charging to charge the battery of the target module.

[0106] In some embodiments, the power supply 601 may be a constant current source, an AC regulated power supply, a DC regulated power supply, an inverter regulated power supply, a switching regulated power supply, or the like.

[0107] In the technical solution of the embodiment of the present application, the energy replenishment circuit includes a power supply and a fourth switching circuit. The implementation method of the energy replenishment circuit is simple. The controller can control the power supply based on the fourth switching circuit to charge the module that needs energy replenishment, and the control method is easy to implement.

[0108] According to some embodiments of the present application, a control method for an energy storage system is provided. The control method is applied to the energy storage system provided in any of the above embodiments. The control method may include:

[0109] The first switch circuit is controlled to be turned off, and the second switch circuit and the third switch circuit are controlled to be turned on, so as to control the first energy storage sub-circuit and the second energy storage sub-circuit to form a target loop; when the first energy storage sub-circuit and the second energy storage sub-circuit form the target loop, the working condition of the test circuit in the energy storage circuit is tested; the test circuit includes the first energy storage sub-circuit or the second energy storage sub-circuit.

[0110] According to some embodiments of the present application, when the first energy storage sub-circuit and the second energy storage sub-circuit form a target loop, the working condition of the test circuit in the energy storage circuit is tested, including: obtaining the actual current parameters of the target loop; and testing the working condition of the test circuit based on the actual current parameters and the preset test current parameters of the test circuit.

[0111] In some embodiments, the preset test current parameters may be one or more parameters of a test current value, a test current duty cycle, a test current fluctuation frequency, etc. The preset test current parameters may be input through a screen or set by programming.

[0112] In an embodiment of the present application, a current transformer is provided on the circuit of the energy storage system, and the current is detected in real time by electromagnetic induction, thereby obtaining the actual current parameters of the energy storage circuit.

[0113] In the test operation mode, the energy storage unit in the energy storage module is used to provide direct current to the energy storage system.

[0114] In an embodiment of the present application, the controller obtains the actual current parameters of the target circuit, compares the actual current parameters with the preset test current parameters, and if the actual current parameters are consistent with the preset test current parameters, the working condition of the test circuit is tested; if the actual current parameters are inconsistent with the preset test current parameters, corresponding adjustment strategies can be adopted according to the difference in the preset test current parameters to make the actual current parameters consistent with the preset test current parameters to test the working condition of the test circuit.

[0115] In the technical solution of the embodiment of the present application, the actual current parameters are determined based on the actual current parameters and the preset test current parameters of the test circuit, thereby completing the test of the working condition of the test circuit, making the test of the working condition of the test circuit more accurate.

[0116] According to some embodiments of the present application, based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested, including: if the actual current value of the target loop is inconsistent with the test current value included in the preset test current, then adjusting the number of energy storage modules put into operation in the accompanying test circuit in the energy storage circuit, and / or adjusting the time period for which the energy storage modules are put into operation to adjust the duty cycle of the energy storage modules put into operation, and testing the working condition of the test circuit.

[0117] The duty cycle of the energy storage module = the duration of the energy storage module being on / the duration of one cycle. The duration of one cycle is the sum of the duration of the energy storage module being on and the duration of the energy storage module being off.

[0118] In an embodiment of the present application, a current transformer can be used to obtain the actual current value of the target circuit in real time, and the actual current value can be sent to a controller. The controller controls the number of energy storage modules put into operation in the test circuit based on the comparison between the actual current value and the test current value, and / or adjusts the duration of the energy storage modules put into operation to adjust the duty cycle of the energy storage modules put into operation to test the working condition of the test circuit.

[0119] Controlling the number of energy storage modules in the test circuit and / or adjusting the duration of the energy storage modules in operation to adjust the duty cycle of the energy storage modules to test the working condition of the test circuit can include the following three implementation methods:

[0120] The first method is to control the number of energy storage modules in the test circuit. For example, in test mode, if the test circuit has energy storage module SM1 and the actual current is lower than the test current, the controller can control energy storage module SM2 to increase the actual current in the target circuit.

[0121] The second method: The controller controls the duration of the energy storage module in the test circuit. For example, in test operation mode, if the energy storage module in the test circuit is SM1 and the actual current value is lower than the test current value, the controller increases the duration of the energy storage module SM1 and the current duty cycle to increase the actual current value of the target circuit.

[0122] The third method is to combine the first and second methods mentioned above, control the number of energy storage modules put into the test circuit, and control the input time of the energy storage modules, thereby changing the actual current value in the target circuit, so that the actual current value is consistent with the test current value to test the working condition of the test circuit.

[0123] In the technical solution of the embodiment of the present application, when the actual current value is inconsistent with the test current value, the duty cycle of the energy storage modules put into use is adjusted by adjusting the number of energy storage modules put into use in the test circuit and / or adjusting the time for which the energy storage modules are put into use to test the working condition of the test circuit, so as to make the working condition of the test circuit more accurate.

[0124] According to some embodiments of the present application, the method further includes:

[0125] If the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency included in the preset test current parameters, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the accompanying test circuit to test the working condition of the test circuit.

[0126] The switching frequency refers to the number of switching cycles within a period of time.

[0127] In an embodiment of the present application, the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency, and the switching frequency of the energy storage module in the test circuit is adjusted to test the working condition of the test circuit. For example, when the actual current fluctuation frequency of the target circuit is less than the test current fluctuation frequency, the controller reduces the switching frequency of the energy storage module in the test circuit to increase the actual current fluctuation frequency to the test current fluctuation frequency. When the actual current fluctuation frequency of the target circuit is greater than the test current fluctuation frequency, the controller increases the switching frequency of the energy storage module in the test circuit to reduce the actual current fluctuation frequency to the test current fluctuation frequency.

[0128] In the technical solution of the embodiment of the present application, when the actual current fluctuation frequency is inconsistent with the test current fluctuation frequency, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the test circuit to test the working condition of the test circuit, so that the working condition of the test circuit is tested more accurately.

[0129] According to some embodiments of the present application, the method further includes:

[0130] The switching of the energy storage module in the test circuit is controlled according to the test current duty cycle included in the preset test current parameters to test the working condition of the test circuit.

[0131] The test current duty cycle is the energy storage module's on-time divided by the duration of one cycle. A cycle is equal to the sum of the energy storage module's on-time and the tested module's off-time. For example, within one cycle, the controller controls the energy storage module's on-time to 70 seconds and its off-time to 30 seconds. The test current duty cycle of the energy storage module is 0.7.

[0132] In an embodiment of the present application, when the actual current duty cycle of the target circuit is less than the test current duty cycle, the controller controls the switching of the energy storage module in the test circuit according to the test current duty cycle to test the working condition of the test circuit.

[0133] In the technical solution of the embodiment of the present application, the switching of the energy storage module in the test module is directly controlled according to the test current duty cycle to simulate the actual working conditions, so as to test the working conditions of the test circuit, making the test of the working conditions of the test circuit more accurate.

[0134] According to some embodiments of the present application, the control method of the energy storage system further includes:

[0135] The first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the target loop state to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit.

[0136] In an embodiment of the present application, when the test of the test circuit is completed, the controller turns on the first switch circuit K1 and controls the second switch circuit K2 and the third switch circuit K3 to turn off, so as to control the energy storage circuit to switch from the state of the target loop to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit, that is, to control the energy storage circuit to switch from the test operation mode to the actual operation working mode.

[0137] In the technical solution of the embodiment of the present application, the first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the test operation mode to the actual operation mode. This eliminates the need to disassemble the energy storage system multiple times to put the energy storage system into the actual operation mode, thereby solving the problem of heavy workload in installing and testing the energy storage system and reducing the time cost of testing the energy storage system. At the same time, since the energy storage system can be switched from the test operation mode to the actual operation mode, there is no need to disassemble and install the energy storage system between the test operation platform and the actual operation platform, and there is no need to prepare a separate set of supporting equipment for the test operation platform, thereby saving test costs. Among them, the supporting equipment includes, for example, control and protection equipment, reactors, measuring equipment, water cooling and background equipment.

[0138] According to some embodiments of the present application, the energy storage system further includes an energy compensation circuit, which is connected to the controller and the energy storage circuit; and the method further includes:

[0139] Obtain the state of charge of the energy storage module; determine the energy storage module corresponding to the state of charge less than the preset state of charge as the target module, and control the energy replenishment circuit to charge the target module.

[0140] The controller obtains the charge state of the energy storage module in the accompanying test circuit and the energy storage module in the tested circuit, compares the charge state of each energy storage module with the preset charge state, determines the energy storage module corresponding to the charge state that is less than the preset charge state as the target module, and controls the energy charging unit corresponding to the target module in the energy charging circuit to charge the battery of the target module.

[0141] In the technical solution of the embodiment of the present application, the state of charge of the energy storage module is obtained, and the energy storage module corresponding to the state of charge less than the preset state of charge is determined as the target module, and the energy compensation circuit is controlled to charge the target module. In the embodiment of the present application, the energy compensation circuit is used to charge the energy storage module corresponding to the state of charge less than the preset state of charge, so that the state of charge of the energy storage module in the accompanying test circuit and the energy storage module in the tested circuit meet the preset state of charge, laying the foundation for subsequent testing of the working condition of the tested circuit in the energy storage circuit based on the test operation mode.

[0142] According to some embodiments of the present application, the energy charging circuit includes a power supply and a fourth switching circuit, wherein the fourth switching circuit is connected to the power supply and the controller; controlling the energy charging circuit to charge the target module includes:

[0143] The fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using the power supply.

[0144] In an embodiment of the present application, the energy replenishment circuit includes a power supply and a fourth switching circuit. Based on the above embodiment, each energy replenishment unit may include a power supply and a fourth switching circuit. The controller controls the fourth switching circuit corresponding to the target module to conduct, and uses the power supply corresponding to the target module to charge the battery of the target module. When all energy storage modules in the accompanying test circuit and the tested circuit meet the preset state of charge requirements, the controller controls the energy storage circuit to enter a test operation mode based on the switching circuit, and tests the operating condition of the tested circuit in the energy storage circuit in the test operation mode.

[0145] In the technical solution of the embodiment of the present application, the fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using the power supply. In the embodiment of the present application, the energy replenishment circuit includes the power supply and the fourth switch circuit. The implementation method of the energy replenishment circuit is simple. The controller controls the power supply to charge the target module based on the fourth switch circuit, and the control method is easy to implement.

[0146] FIG7 is a flow chart of a control method for an energy storage system provided by an embodiment of the present application. As shown in FIG7 , the method may include the following steps: starting a push-push test of an energy storage module in the energy storage system, switching the energy storage system to a push-push test circuit, determining an energy storage module to be tested from the energy storage system, bypassing other energy storage modules in the energy storage system, determining whether the state of charge (SOC) of the energy storage module to be tested meets a preset SOC requirement, and setting preset test current parameters, i.e., test current value, test current fluctuation frequency, and test current duty cycle, according to test requirements if the preset SOC requirement is met. Starting the push-push test, adjusting the duty cycle of the accompanying test module so that the actual test current parameters on the target circuit are consistent with the preset test current parameters, controlling the energy storage circuit to be in a test operation mode based on a switch circuit, testing the working condition of the tested circuit in the energy storage circuit, and after the energy storage module test operation is completed, controlling the energy storage circuit to be in an actual operation mode based on the switch circuit, and completing the push-push test of the energy storage module.

[0147] FIG8 is a flow chart of another control method for an energy storage system provided by an embodiment of the present application. As shown in FIG8 , the method may include the following steps: starting a push-push test of the energy storage system, switching the energy storage system to a push-push test circuit, determining the valve section to be tested from the energy storage system, bypassing other energy storage modules in the energy storage system, determining whether the charge state of the energy storage module in the valve section to be tested meets the preset charge state requirements, and setting the preset test current parameters according to the test requirements, i.e., the test current value, the test current fluctuation frequency, and the test current duty cycle. Starting the push-push test, adjusting the duty cycle of the accompanying test module in the valve section to be tested so that the actual test current parameters on the target circuit are consistent with the preset test current parameters, controlling the energy storage circuit to be in a test operation mode based on the switch circuit, testing the working condition of the tested circuit in the energy storage circuit, and after the valve section test operation is completed, controlling the energy storage circuit to be in an actual operation mode based on the switch circuit, and completing the push-push test of the valve section.

[0148] In the technical solution of the embodiment of the present application, the energy storage circuit is controlled to be in the test operation mode based on the switching circuit, and the working condition of the tested circuit in the energy storage circuit is tested in the test operation mode. The energy storage system in the present application includes a switching circuit, which can put the energy storage circuit in the test operation mode based on the switching circuit, so as to test the working condition of the tested circuit in the energy storage circuit in the test operation mode. The energy storage circuit can be put in the test operation mode based on the switching circuit, that is, before the energy storage circuit is in the test operation mode, the energy storage circuit can be in the actual operation mode or in other modes such as the unpowered mode. The energy storage circuit can be put in the test operation mode based on the switching circuit. Therefore, there is no need to install and test the energy storage system between the test operation mode and the actual operation mode, which can reduce the installation and testing workload of the energy storage system.

[0149] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0150] Based on the same inventive concept, embodiments of the present application also provide an energy storage system control device for implementing the aforementioned energy storage system control method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more camera calibration device embodiments provided below can be found in the aforementioned limitations of the energy storage system control method and will not be further elaborated here.

[0151] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in FIG9 . The computer device includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store relevant data of the energy storage system. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a control method for an energy storage system is implemented.

[0152] Those skilled in the art will understand that the structure shown in Figure 9 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0153] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0154] Controlling the first switch circuit to be turned off, and controlling the second switch circuit and the third switch circuit to be turned on, so as to control the first energy storage sub-circuit and the second energy storage sub-circuit to form a target loop;

[0155] When the first energy storage sub-circuit and the second energy storage sub-circuit form a target loop, the working condition of the tested circuit in the energy storage circuit is tested; the tested circuit includes the first energy storage sub-circuit or the second energy storage sub-circuit.

[0156] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0157] Get the actual current parameters of the target circuit;

[0158] Based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested.

[0159] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0160] If the actual current value of the target circuit is inconsistent with the test current value included in the preset test current parameters, the number of energy storage modules in the accompanying test circuit in the energy storage circuit is adjusted, and / or the duration of the energy storage modules put into operation is adjusted to adjust the duty cycle of the energy storage modules put into operation and test the working condition of the test circuit.

[0161] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0162] If the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency included in the preset test current parameters, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the accompanying test circuit to test the working condition of the test circuit.

[0163] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0164] The switching of the energy storage module in the test circuit is controlled according to the test current duty cycle included in the preset test current parameters to test the working condition of the test circuit.

[0165] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0166] The first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the target loop state to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit.

[0167] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0168] Obtain the state of charge of the energy storage module;

[0169] An energy storage module corresponding to a state of charge less than a preset state of charge is determined as a target module, and an energy replenishment circuit is controlled to charge the target module.

[0170] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0171] Controlling the energy replenishment circuit to charge the target module includes:

[0172] The fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using the power supply.

[0173] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following steps are implemented:

[0174] Controlling the first switch circuit to be turned off, and controlling the second switch circuit and the third switch circuit to be turned on, so as to control the first energy storage sub-circuit and the second energy storage sub-circuit to form a target loop;

[0175] When the first energy storage sub-circuit and the second energy storage sub-circuit form a target loop, the working condition of the tested circuit in the energy storage circuit is tested; the tested circuit includes the first energy storage sub-circuit or the second energy storage sub-circuit.

[0176] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0177] Get the actual current parameters of the target circuit;

[0178] Based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested.

[0179] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0180] Based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested, including:

[0181] If the actual current value of the target circuit is inconsistent with the test current value included in the preset test current parameter, the number of energy storage modules in the energy storage circuit and the accompanying test circuit is adjusted, and / or the duration of the energy storage modules being put into operation is adjusted to adjust the duty cycle of the energy storage modules to test the working condition of the test circuit;

[0182] The target circuit is the circuit formed by the test circuit and the tested circuit.

[0183] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0184] If the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency included in the preset test current parameters, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the accompanying test circuit to test the working condition of the test circuit.

[0185] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0186] The switching of the energy storage module in the test circuit is controlled according to the test current duty cycle included in the preset test current parameters to test the working condition of the test circuit.

[0187] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0188] The first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the target loop state to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit.

[0189] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0190] Obtain the state of charge of the energy storage module;

[0191] An energy storage module corresponding to a state of charge less than a preset state of charge is determined as a target module, and an energy replenishment circuit is controlled to charge the target module.

[0192] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0193] Controlling the energy replenishment circuit to charge the target module includes:

[0194] The fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using the power supply.

[0195] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0196] Controlling the first switch circuit to be turned off, and controlling the second switch circuit and the third switch circuit to be turned on, so as to control the first energy storage sub-circuit and the second energy storage sub-circuit to form a target loop;

[0197] When the first energy storage subcircuit and the second energy storage subcircuit form a target loop, the operation of the test circuit in the energy storage circuit is tested; the test circuit includes the first energy storage subcircuit or the second energy storage subcircuit. In one embodiment, when the computer program is executed by the processor, the following steps are further implemented:

[0198] Get the actual current parameters of the target circuit;

[0199] Based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested.

[0200] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0201] Based on the actual current parameters and the preset test current parameters of the test circuit, the working condition of the test circuit is tested, including:

[0202] If the actual current value of the target circuit is inconsistent with the test current value included in the preset test current parameter, the number of energy storage modules in the energy storage circuit and the accompanying test circuit is adjusted, and / or the duration of the energy storage modules being put into operation is adjusted to adjust the duty cycle of the energy storage modules to test the working condition of the test circuit;

[0203] The target circuit is the circuit formed by the test circuit and the tested circuit.

[0204] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0205] If the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency included in the preset test current parameters, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the energy storage circuit to test the working condition of the test circuit.

[0206] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0207] The switching of the energy storage module in the test circuit is controlled according to the test current duty cycle included in the preset test current parameters to test the working condition of the test circuit.

[0208] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0209] The first switch circuit is controlled to be turned on, and the second and third switch circuits are controlled to be turned off, so as to control the energy storage circuit to switch from the target loop state to the state of the series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit.

[0210] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0211] Obtain the state of charge of the energy storage module;

[0212] An energy storage module corresponding to a state of charge less than a preset state of charge is determined as a target module, and an energy replenishment circuit is controlled to charge the target module.

[0213] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0214] Controlling the energy replenishment circuit to charge the target module includes:

[0215] The fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using the power supply.

[0216] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0217] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on a regional block chain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, etc., but is not limited thereto.

[0218] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0219] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An energy storage system, wherein: The energy storage system comprises a controller, an energy storage circuit, and a switch device, wherein the controller is connected to the energy storage circuit and the switch device, and the switch device comprises a first switch circuit, a second switch circuit, and a third switch circuit; The energy storage circuit comprises a first energy storage subcircuit and a second energy storage subcircuit connected in series, the first energy storage subcircuit and the second energy storage subcircuit respectively comprise energy storage devices, the energy storage devices comprise an energy storage module or at least two energy storage modules connected in series, the energy storage module comprises a power unit and an energy storage unit connected in parallel with the power unit; The two ends of the first switch circuit are respectively connected to the negative electrode of the first energy storage sub-circuit and the positive electrode of the second energy storage sub-circuit, the two ends of the second switch circuit are respectively connected to the positive electrode of the first energy storage sub-circuit and the positive electrode of the second energy storage sub-circuit, and the two ends of the third switch circuit are respectively connected to the negative electrode of the first energy storage sub-circuit and the negative electrode of the second energy storage sub-circuit.

2. The energy storage system according to claim 1, wherein: The energy storage circuit also includes a circuit breaker, a first end of the circuit breaker is connected between the second switch circuit and the positive electrode of the first energy storage sub-circuit, and a second end of the circuit breaker is connected to a high-voltage positive bus, and / or, a first end of the circuit breaker is connected between the third switch circuit and the negative electrode of the second energy storage sub-circuit, and a second end of the circuit breaker is connected to a high-voltage negative bus.

3. The energy storage system according to claim 1, wherein: The energy storage circuit further includes a reactor, which is connected in series to the positive electrode of the first energy storage sub-circuit and / or the negative electrode of the second energy storage sub-circuit.

4. The energy storage system according to any one of claims 1 to 3, wherein: The first energy storage subcircuit includes a companion test circuit, and the companion test circuit includes at least one energy storage module or at least one valve section in the first energy storage subcircuit; The second energy storage subcircuit includes a tested circuit, and the tested circuit includes at least one energy storage module or at least one valve section in the second energy storage subcircuit.

5. The energy storage system according to any one of claims 1 to 3, wherein: The energy storage system further includes an energy compensation circuit, which is connected to the controller and the energy storage circuit.

6. The energy storage system according to claim 5, wherein: The energy compensation circuit includes a power supply and a fourth switch circuit, and the fourth switch circuit is connected to the power supply and the controller.

7. A control method for an energy storage system, wherein: The control method is applied to the energy storage system according to any one of claims 1 to 6; the control method comprises: Controlling the first switch circuit to be turned off, and controlling the second switch circuit and the third switch circuit to be turned on, so as to control the first energy storage sub-circuit and the second energy storage sub-circuit to form a target loop; When the first energy storage subcircuit and the second energy storage subcircuit form a target loop, the working condition of a circuit under test in the energy storage circuit is tested; the circuit under test includes the first energy storage subcircuit or the second energy storage subcircuit.

8. The method according to claim 7, wherein: The step of testing the working condition of the circuit under test in the energy storage circuit when the first energy storage sub-circuit and the second energy storage sub-circuit form a target loop includes: Obtaining actual current parameters of the target loop; Based on the actual current parameter and the preset test current parameter of the test circuit, the working condition of the test circuit is tested.

9. The method according to claim 8, wherein: The step of testing the working condition of the circuit under test based on the actual current parameter and the preset test current parameter of the circuit under test includes: If the actual current value of the target circuit is inconsistent with the test current value included in the preset test current parameters, the number of energy storage modules in the accompanying test circuit in the energy storage circuit is adjusted, and / or the duration of the energy storage modules being put into operation is adjusted to adjust the duty cycle of the energy storage modules being put into operation, so as to test the working condition of the circuit under test.

10. The method according to claim 9, wherein: The method further comprises: If the actual current fluctuation frequency of the target circuit is inconsistent with the test current fluctuation frequency included in the preset test current parameters, the number of switching cycles within the preset time period is adjusted to adjust the switching frequency of the energy storage module in the accompanying test circuit to test the working condition of the test circuit.

11. The method according to claim 9 or 10, wherein: The method further comprises: The switching of the energy storage module in the test circuit is controlled according to the test current duty cycle included in the preset test current parameters to test the working condition of the test circuit.

12. The method according to claim 11, wherein: The method further comprises: The first switch circuit is controlled to be turned on, and the second switch circuit and the third switch circuit are controlled to be turned off, so as to control the energy storage circuit to switch from the state of the target loop to the state of a series circuit formed by the first energy storage sub-circuit and the second energy storage sub-circuit.

13. The method according to claim 9 or 10, wherein: The method further comprises: Obtain the charge state of the energy storage module; An energy storage module corresponding to a state of charge less than a preset state of charge is determined as a target module, and an energy replenishment circuit is controlled to charge the target module.

14. The method according to claim 13, wherein: The controlling the energy replenishing circuit to charge the target module includes: The fourth switch circuit is controlled to be turned on, and when the fourth switch circuit is turned on, the target module is charged by using a power supply.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 7 to 14 are implemented.

16. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 7 to 14 are implemented.

17. A computer program product comprising a computer program, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 7 to 14 are implemented.

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