Energy storage system, energy replenishment method for energy storage system, apparatus, medium, and program product

Abstract

The present application relates to an energy storage system, an energy replenishment method for the energy storage system, an apparatus, a medium, and a program product. The energy storage system comprises a control device (11), a processing device (12), an energy replenishment power supply (13), and two valve devices; the two valve devices comprise a tested valve device (14) and an accompanying tested valve device (15) connected to the tested valve device (14); the processing device (12) is connected to the valve devices, the control device (11) and the energy replenishment power supply (13), and the valve devices are connected to the control device (11); each valve device comprises one energy storage module or at least two energy storage modules connected in series, and each energy storage module comprises a power unit and an energy storage unit connected in parallel to the power unit. Charging can be carried out without the need to remove the tested valve device (14) and the accompanying tested valve device (15) which are in a low state of charge from the energy storage system, thus removing the work of rewiring the valve devices, saving time, improving the test efficiency of the energy storage system.

Description

Energy storage system, energy replenishment method, equipment, medium and program product of energy storage system Cross-references

[0001] This application refers to Chinese patent application No. 2024103310319, filed on March 21, 2024, entitled “Energy storage system, energy replenishment method, device, medium and program product for energy storage system”, which is incorporated into this application in its entirety by reference. Technical Field

[0002] The present application relates to the technical field of energy storage system replenishment, and in particular to an energy storage system, an energy storage system replenishment method, a device, a medium, and a program product. Background Art

[0003] Energy storage systems are composed of multiple energy storage modules. The operational reliability of these modules is crucial, so it's necessary to test their operation to verify their performance. During the test run, the energy storage system's power cycle is provided by the energy storage units in each module. However, as the total energy of the energy storage system gradually decreases, an external power supply is required to replenish the energy storage units.

[0004] In current test platforms, an offline energy replenishment solution is usually adopted. That is, the test valve device and the accompanying test valve device with a lower charge state are removed from the energy storage system for charging. After charging is completed, they need to be reconnected to continue the test. Therefore, the offline energy replenishment solution affects the test efficiency, resulting in low test efficiency. Summary of the Invention

[0005] Based on this, it is necessary to provide an energy storage system, an energy replenishment method, equipment, medium and program product for the energy storage system to improve the test efficiency of the energy storage system in response to the above technical problems.

[0006] In a first aspect, the present application provides an energy storage system, the energy storage system including a control device, a processing device, an energy supply, and two valve devices, the two valve devices including a test valve device and a companion test valve device connected to the test valve device;

[0007] The processing device is connected to each valve device, the control device and the energy supply, and each valve device is connected to the control device;

[0008] Each valve 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.

[0009] In the energy storage system provided by the embodiment of the present application, since each valve device is connected to the control device, when the operation of the energy storage system is tested, the control device can obtain the SOC of each valve device and obtain the total SOC of the energy storage system based on the SOC of each valve device. At the same time, since the processing device is connected to the control device and the energy replenishment power supply, the control device can send the total SOC to the processing device, and the processing device can determine whether the valve device needs to be replenished by the energy replenishment power supply based on the total SOC, thereby realizing online energy replenishment when testing the operation of the energy storage system. There is no need to remove the test valve device and the accompanying test valve device with a lower charge state from the energy storage system for charging, thus eliminating the need to rewire the valve device, saving time, and thus improving the test efficiency of the energy storage system. That is, the embodiment of the present application can recharge the energy storage system while testing the operation of the energy storage system, saving time and rewiring work costs, and improving the test efficiency of the energy storage system.

[0010] In one embodiment, the first end of the processing device is connected to the low-pressure end of the tested valve device and the low-pressure end of the accompanying test valve device;

[0011] The second end of the processing device is connected to the high-pressure end of the tested valve device and the high-pressure end of the accompanying test valve device.

[0012] The energy storage system provided in the embodiments of the present application can realize online energy replenishment of the valve device when testing the operation of the energy storage system, without removing the test valve device and the accompanying test valve device with a lower charge state from the energy storage system for charging, thereby improving the test efficiency of the energy storage system and effectively simulating the actual operation of the energy storage module.

[0013] In one embodiment, the energy storage system further includes a reactor;

[0014] The accompanying test valve device is connected to the tested valve device through a reactor, and the second end of the processing device is connected to the reactor.

[0015] The energy storage system provided in the embodiment of the present application can achieve voltage balance between the tested valve device and the accompanying tested valve device through the reactor, thereby reducing current harmonics between the tested valve device and the accompanying tested valve device.

[0016] In one embodiment, the reactor includes a first reactor;

[0017] The high-pressure end of the test valve device and the second end of the processing device are connected to the first end of the first reactor, and the second end of the first reactor is connected to the high-pressure end of the tested valve device.

[0018] The energy storage system provided in the embodiment of the present application can achieve voltage balance between the tested valve device and the accompanying tested valve device through the first reactor, thereby reducing current harmonics between the tested valve device and the accompanying tested valve device.

[0019] In one of the embodiments, the reactor further includes a second reactor;

[0020] The first end of the first reactor is connected to the first end of the second reactor, and the second end of the second reactor is connected to the high-voltage end of the test valve device;

[0021] The second end of the processing device is connected to the first end of the first reactor and the first end of the second reactor.

[0022] The energy storage system provided in the embodiment of the present application can achieve voltage balance between the tested valve device and the accompanying tested valve device through the first reactor and the second reactor, thereby reducing current harmonics between the tested valve device and the accompanying tested valve device.

[0023] In one embodiment, the energy supplement power supply includes an AC power grid and a filter circuit, and the processing device is connected to the AC power grid through the filter circuit.

[0024] In the energy storage system provided in the embodiment of the present application, the filtering circuit can filter the current provided by the AC power grid and input the filtered current into the processing device. The processing device rectifies the filtered current and controls the duty cycle of the pulse signal of the internal switching tube, thereby outputting a replenishing current for replenishing the energy storage system. This solution can reduce the complexity of replenishing the energy storage system and is relatively easy to implement.

[0025] In a second aspect, the present application further provides an energy replenishment method for an energy storage system, the energy replenishment method being applied to a processing device in any of the above energy storage systems; the method comprising:

[0026] While testing the operation of the energy storage system, obtaining a first state of charge of the energy storage system;

[0027] Determining a first energy replenishment current reference value according to the first state of charge and a first preset state of charge;

[0028] The energy storage system is charged based on the first energy replenishment current reference value.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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 specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment 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 drawings to represent the same components. In the drawings:

[0034] FIG1 is a schematic diagram of a structure of an energy storage system according to an embodiment of the present application;

[0035] FIG2 is a schematic structural diagram of an energy storage module in a half-bridge topology according to an embodiment of the present application;

[0036] FIG3 is a schematic structural diagram of an energy storage module in a full-bridge topology according to an embodiment of the present application;

[0037] FIG4 is a second structural diagram of an energy storage system provided in an embodiment of the present application;

[0038] FIG5 is a control block diagram of the output of the energy replenishment current of the processing device provided in an embodiment of the present application;

[0039] FIG6 is a third structural diagram of an energy storage system provided in an embodiment of the present application;

[0040] FIG7 is a fourth structural diagram of an energy storage system provided in an embodiment of the present application;

[0041] FIG8 is a fifth structural diagram of an energy storage system provided in an embodiment of the present application;

[0042] FIG9 is a flow chart of one of the energy replenishment methods of the energy storage system provided in an embodiment of the present application;

[0043] FIG10 is a flow chart of a method for determining a first energy replenishment current reference value according to an embodiment of the present application;

[0044] FIG11 is a flow chart of a method for charging an energy storage system according to an embodiment of the present application;

[0045] FIG12 is a second flow chart of a method for charging an energy storage system according to an embodiment of the present application;

[0046] 13 is a schematic diagram of a process for adjusting a first energy replenishment current reference value to obtain a second energy replenishment current reference value according to an embodiment of the present application;

[0047] FIG14 is a second flow chart of the energy storage system energy replenishment method provided in an embodiment of the present application;

[0048] FIG15 is a diagram showing the internal structure of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] 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.

[0050] 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 specific 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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).

[0055] 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.

[0056] 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.

[0057] Energy storage systems are composed of multiple energy storage modules. The operational reliability of these modules is crucial, so it's necessary to test their operation to verify their performance. During the test run, the energy storage system's power cycle is provided by the energy storage units in each module. However, as the total energy of the energy storage system gradually decreases, an external power supply is required to replenish the energy storage units.

[0058] In current test platforms, an offline energy replenishment solution is usually adopted. That is, the test valve device and the accompanying test valve device with a lower charge state are removed from the energy storage system for charging. After charging is completed, they need to be reconnected to continue the test. Therefore, the offline energy replenishment solution affects the test efficiency, resulting in low test efficiency.

[0059] In order to solve the above technical problems, an embodiment of the present application provides an energy storage system, which includes a control device, a processing device, an energy supply and two valve devices, wherein the two valve devices include a test valve device and a companion test valve device connected to the test valve device; the processing device is connected to each valve device, the control device and the energy supply, and each valve device is connected to the control device; each valve 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.

[0060] In the embodiment of the present application, since each valve device is connected to the control device, when the operation of the energy storage system is tested, the control device can obtain the state of charge (SOC) of each valve device and determine the total SOC of the energy storage system based on the SOC of each valve device. At the same time, since the processing device is connected to the control device and the energy replenishment power supply, the control device can send the total SOC to the processing device, and the processing device can determine whether the valve device needs to be replenished by the energy replenishment power supply based on the total SOC, thereby realizing online energy replenishment of the valve device when the operation of the energy storage system is tested. There is no need to remove the test valve device and the accompanying test valve device with a lower state of charge from the energy storage system for charging, thus eliminating the need to rewire the valve device, saving time, and thus improving the testing efficiency of the energy storage system. That is, the embodiment of the present application can recharge the energy storage system while testing the operation of the energy storage system, saving time and rewiring work costs, and improving the testing efficiency of the energy storage system.

[0061] The operation of the energy storage system can be tested by a push test, in which any one of the two valve devices can be used as the tested valve device and the other as the accompanying test valve device, thereby realizing a push test on the operation of the energy storage system.

[0062] In one embodiment, as shown in FIG1 , FIG1 is one of the structural schematic diagrams of an energy storage system provided in an embodiment of the present application. As shown in FIG1 , the energy storage system includes a control device 11, a processing device 12, an energy supply 13, and two valve devices. The two valve devices include a test valve device 14 and a test valve device 15 connected to the test valve device 14.

[0063] The processing device 12 is connected to each valve device, the control device 11 and the energy supply 13, and each valve device is connected to the control device 11;

[0064] Each valve 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.

[0065] In an embodiment of the present application, the valve device can be a valve tower or a container; multiple energy storage modules can be arranged in series up and down similarly to the valve tower, and multiple energy storage modules can also be arranged in the container in a manner different from the valve tower.

[0066] The processing device 12 may include a power conversion system (PCS) and a rectifier. In one possible implementation, the energy supply 13 may include a filter circuit and an AC power grid, wherein the filter circuit is provided between the processing device 12 and the AC power grid.

[0067] In another possible implementation, the energy supplement power supply 13 may include a transformer and an AC power grid, and the filter circuit is provided between the processing device 12 and the AC power grid.

[0068] Among them, the energy storage module can be a half-bridge topology energy storage module or a full-bridge topology energy storage module, as shown in Figures 2 and 3. Figure 2 is a structural schematic diagram of the energy storage module in the half-bridge topology form provided in an embodiment of the present application, and Figure 3 is a structural schematic diagram of the energy storage module in the full-bridge topology form provided in an embodiment of the present application.

[0069] The energy storage module shown in Figure 2 includes a first pre-charge resistor R1, a first bus switch K1, a first bypass switch K2, a first grading resistor R2, an insulated gate bipolar transistor (IGBT), and a battery. The IGBT includes a first insulated gate bipolar transistor T1, a second insulated gate bipolar transistor T2, and a battery. The energy storage unit includes a battery and a first pre-charge resistor R1, and the power unit includes a first bus switch K1, a grading resistor R2, a first capacitor C1, a first insulated gate bipolar transistor T1, and a second insulated gate bipolar transistor T2.

[0070] The energy storage module shown in Figure 3 includes a second pre-charging resistor R3, a second bus switch K3, a second bypass switch K4, a second equalizing resistor R4, an IGBT, and a battery. The IGBT includes a third insulated gate bipolar transistor T3, a fourth insulated gate bipolar transistor T4, a fifth insulated gate bipolar transistor T5, and a sixth insulated gate bipolar transistor T6. The energy storage unit includes a battery and the second pre-charging resistor R3. The power unit includes a second bus switch K3, a second equalizing resistor R2, a second capacitor C2, a third insulated gate bipolar transistor T3, a fourth insulated gate bipolar transistor T4, a fifth insulated gate bipolar transistor T5, and a sixth insulated gate bipolar transistor T6.

[0071] In the energy storage system provided by the embodiment of the present application, since each valve device is connected to the control device, when the operation of the energy storage system is tested, the control device can obtain the SOC of each valve device and obtain the total SOC of the energy storage system based on the SOC of each valve device. At the same time, since the processing device is connected to the control device and the energy replenishment power supply, the control device can send the total SOC to the processing device, and the processing device can determine whether the valve device needs to be replenished by the energy replenishment power supply based on the total SOC, thereby realizing online energy replenishment when testing the operation of the energy storage system. There is no need to remove the test valve device and the accompanying test valve device with a lower charge state from the energy storage system for charging, thus eliminating the need to rewire the valve device, saving time, and thus improving the test efficiency of the energy storage system. That is, the embodiment of the present application can recharge the energy storage system while testing the operation of the energy storage system, saving time and rewiring work costs, and improving the test efficiency of the energy storage system.

[0072] In one embodiment, as shown in FIG4 , which is a second structural diagram of an energy storage system provided by an embodiment of the present application, a first end of the processing device 12 is connected to the low-pressure end of the test valve device 14 and the low-pressure end of the accompanying test valve device 15;

[0073] The second end of the processing device 12 is connected to the high-pressure end of the tested valve device 14 and the high-pressure end of the accompanying test valve device 15 .

[0074] In an embodiment of the present application, since the control device can obtain the SOC of each valve device when testing the operation of the energy storage system, and then obtain the total SOC of the energy storage system based on the SOC of each valve device, and send the total SOC to the processing device. The processing device compares the total SOC with the first preset SOC. If the total SOC is less than the first preset SOC, it means that the energy storage system needs to be recharged. When the processing device determines that the energy storage system needs to be recharged, the processing device can determine the difference between the total SOC and the first preset SOC, determine the first recharge current reference value based on the difference, and charge the energy storage system based on the first recharge current reference value. The total SOC can be equal to the sum of the SOCs of each valve device, or it can be equal to the value obtained after correcting the sum. The product obtained by multiplying the sum by a preset coefficient can be used as the total SOC to correct the sum.

[0075] Charging the energy storage system based on the first energy replenishment current reference value can be achieved in the following ways:

[0076] In one possible implementation, a processing device processes the current provided by the energy supply based on a first energy replenishment current reference value and outputs an energy replenishment current, which is used to replenish the valve device. The energy replenishment current may be a current close to or equal to the first energy replenishment current reference value. Furthermore, because a first end of the processing device is connected to the low-pressure end of the valve device under test and the low-pressure end of the accompanying valve device under test, and a second end of the processing device is connected to the high-pressure end of the valve device under test and the high-pressure end of the accompanying valve device under test, the energy replenishment current output by the processing device can replenish the valve device, eliminating the need to remove valve devices with a lower state of charge from the energy storage system for recharging, thereby improving the testing efficiency of the energy storage system.

[0077] In another possible implementation, assuming the test-side current of the test valve device is Ism1, the test-side current of the tested valve device is Ism2, and the energizing current reference value of the processing device is Iref. The energizing current output by the processing device is I≥0. To reduce the probability that the test-side current Ism1 of the test valve device exceeds the rated current Imax, it is necessary to increase the current limit of the test-side current. Therefore, if -Ism2+Iref>Imax, the first energizing current reference value needs to be adjusted to determine a second energizing current reference value. Specifically, the energizing current reference value to be determined is less than or equal to Imax+Ism2, i.e., the second energizing current reference value is less than or equal to Imax+Ism2. After determining the second energizing current reference value, the processing device processes the current of the energizing power supply based on the second energizing current reference value and outputs an energizing current. The valve device is energized using this energizing current. The energizing current can be a current close to or equal to the second energizing current reference value. It should be noted that the condition in which the test-side current Ism1 of the test valve device is greater than the rated current Imax only occurs when the test valve device is charging the test valve device, that is, when the test-side current Ism2 of the test valve device is less than 0. It should be noted that to improve charging efficiency, Imax + Ism2 can be used as the second charging current reference value.

[0078] In the above two implementations, the output of the energy replenishment current of the processing device can be implemented with reference to FIG5 , which is a control block diagram of the output of the energy replenishment current of the processing device provided in an embodiment of the present application. The processing device can be a PCS, which includes a processing module, a second PI controller, a third PI controller, a fourth PI controller, a conversion module, and a space vector pulse width modulation (SVPWM) module. The processing module includes a comparison module or a first PI controller. The comparison module or the first PI controller can determine a first SOC of the energy storage system based on the SOC of the test valve device and the SOC of the accompanying test valve device, compare the first SOC with a first preset state of charge, and if the first SOC is less than the first preset state of charge, determine the difference between the first SOC and the first preset state of charge, and determine a first energy replenishment current reference value based on the difference. The duty cycle of the pulse signal output by the SVPWM module is determined based on the first energy replenishment current reference value to control the actual energy replenishment current output by the PCS to be equal to the energy replenishment current reference value Iref of the PCS. The energy replenishment current reference value Iref may be a first energy replenishment current reference value or a second energy replenishment current reference value.

[0079] Qref represents the reference value of the reactive power output by the PCS, and Q represents the actual value of the reactive power output by the PCS; Iref represents the determined reference value of the energy replenishment current of the PCS, and I represents the energy replenishment current actually output by the PCS; Iqref represents the reference value of the current on the q axis after Iref is converted to the dq two-dimensional coordinate system, and Idref represents the reference value of the current on the d axis after Iref is converted to the dq two-dimensional coordinate system; Iq represents the reference value of the current on the q axis after the three-phase AC power actually input to the PCS is converted to the dq two-dimensional coordinate system, and Id represents the actual The three-phase AC power input to the PCS is converted into the reference value of the current on the d-axis after the three-phase AC power is converted into the dq two-dimensional coordinate system; Uqref represents the reference value of the voltage on the q-axis determined based on the error between Iqref and Iq, and Udref represents the reference value of the voltage on the d-axis determined based on the error between Idref and Id; the conversion module is used to convert Uqref and Udref in the two-dimensional coordinate system dq into voltages in the three-dimensional coordinate system ABC, and the SVPWM module is used to output the duty cycle to control the actual energy replenishment current output by the PCS to be equal to Iref.

[0080] The energy storage system provided in the embodiments of the present application can realize online energy replenishment of the valve device when testing the operation of the energy storage system, without removing the test valve device and the accompanying test valve device with a lower charge state from the energy storage system for charging, thereby improving the test efficiency of the energy storage system and effectively simulating the actual operation of the energy storage module.

[0081] In one embodiment, the energy storage system further includes a reactor;

[0082] The accompanying test valve device 15 is connected to the tested valve device 14 via a reactor, and the second end of the processing device 12 is connected to the reactor.

[0083] The number of reactors may be one or more, and the reactors may include, but are not limited to, the following forms. Multiple reactors may be connected in parallel to form a reactor module, through which the test valve device 15 is connected to the test valve device 14. Alternatively, multiple reactors may be connected in series to form a reactor module, through which the test valve device 15 is connected to the test valve device 14. Alternatively, multiple reactors may be connected in series and in parallel to form a reactor module, through which the test valve device 15 is connected to the test valve device 14.

[0084] The energy storage system provided in the embodiment of the present application can achieve voltage balance between the tested valve device and the accompanying tested valve device through the reactor, thereby reducing current harmonics between the tested valve device and the accompanying tested valve device.

[0085] In one embodiment, as shown in FIG6 , FIG6 is a third structural diagram of an energy storage system provided by an embodiment of the present application. The reactor includes a first reactor 61;

[0086] The high-pressure end of the test valve device 15 and the second end of the processing device 12 are connected to the first end of the first reactor 61 , and the second end of the first reactor 51 is connected to the high-pressure end of the tested valve device 14 .

[0087] Illustratively, the accompanying test valve device 15 includes energy storage modules A1, A2, ..., and An connected in series; the tested valve device 14 includes energy storage modules B1, B2, ..., and Bn connected in series, where n is an integer not less than 1. It should be noted that the number of energy storage modules included in the accompanying test valve device 15 and the tested valve device 14 may be equal or unequal.

[0088] The energy storage system provided in the embodiment of the present application can achieve voltage balance between the tested valve device and the accompanying tested valve device through the first reactor, thereby reducing current harmonics between the tested valve device and the accompanying tested valve device.

[0089] In one embodiment, as shown in FIG7 , FIG7 is a fourth structural diagram of an energy storage system provided by an embodiment of the present application. The reactor further includes a second reactor 62;

[0090] The first end of the first reactor 61 is connected to the first end of the second reactor 62 , and the second end of the second reactor 62 is connected to the high-voltage end of the test valve device 15 ;

[0091] A second end of the processing device 12 is connected to a first end of the first reactor 61 and a first end of the second reactor 62 .

[0092] Optionally, the inductance value of the first reactor and the inductance value of the second reactor may be the same or different. When the inductance value of the first reactor and the inductance value of the second reactor are the same, the probability of voltage balance between the tested valve device and the accompanying tested valve device can be increased, and the current balance between the tested valve device and the accompanying tested valve device can be achieved.

[0093] The energy storage system provided in the embodiment of the present application can achieve voltage balance between the tested valve device and the accompanying tested valve device through the first reactor and the second reactor, thereby reducing current harmonics between the tested valve device and the accompanying tested valve device.

[0094] In one embodiment, as shown in Figure 8, which is a fifth structural diagram of an energy storage system provided by an embodiment of the present application, the energy supply 13 includes a filter circuit 81 and an AC power grid 82, and the processing device is connected to the AC power grid 82 through the filter circuit 81.

[0095] Taking the processing device 12 shown in Figure 8 as a PCS as an example, the energy replenishment control process of the PCS is introduced: after the test valve device and the accompanying test valve device shown in Figure 8 are started, the pre-charge resistor is connected, and then the switch tube in the PCS is unlocked. At this time, the energy replenishment control algorithm of the PCS is not turned on, the output current of the PCS gradually reaches 0, the reactive power of the PCS is 0, and the output terminal potential of the PCS is suspended.

[0096] When the output current of the PCS reaches 0, that is, after the PCS reaches stability, the PCS sends a first instruction to the control device. Based on the first instruction, the control device controls the switches of each energy storage module in the test valve device and the test valve device to unlock, and the test valve device and the test valve device start to work. Under the action of the current control algorithm of the test valve device and the test valve device, the test-side current Ism2 of the test valve device gradually reaches the preset current value, and power transfer begins. At the same time, the SOC balancing algorithm inside the energy storage system works to balance the SOC distribution by adjusting the current offset of each energy storage module. Since the output current of the PCS is 0, it has no impact on the test of the energy storage system.

[0097] When the current on the test side of the test valve device reaches the preset current value, it means that the energy storage system has reached a stable state. When the energy storage system reaches a stable state, the energy replenishment control algorithm of the PCS is turned on, and the PI controller in the PCS receives the total SOC of all energy storage modules in the energy storage system sent by the control device, and determines whether the total SOC is less than the first preset SOC. When the total SOC is less than the first preset SOC, the difference between the total SOC and the first preset SOC is determined, and the first energy replenishment current reference value is determined based on the difference. Based on the first energy replenishment current reference value, the energy replenishment current for replenishing the energy storage system is output through the PCS current control algorithm. Among them, the energy replenishment current for replenishing the energy storage system output by the PCS current control algorithm can be achieved in the following ways:

[0098] The AC grid output current is filtered by the filter circuit to generate an intermediate current. The PCS rectifies the intermediate current and controls the duty cycle of the pulse signal of the internal switching transistor to output a charging current for the energy storage system. The output charging current for the energy storage system is equal to or nearly equal to the first charging current reference value, and can also be equal to or nearly equal to the second charging current reference value described above.

[0099] In an embodiment of the present application, to reduce the frequency of recharging the energy storage system, a second state of charge (SOC) of the energy storage system can be obtained while the energy storage system is being charged based on a first recharging current reference value. If the second SOC is greater than or equal to a second preset SOC, charging of the energy storage system is stopped. That is, while the energy storage system is being charged, it can be determined whether the second SOC of the energy storage system has reached a preset upper limit. If the SOC reaches or exceeds the upper limit, charging of the energy storage system is stopped. During this process, the energy storage system can be tested continuously.

[0100] The energy storage system is shut down in reverse order. First, the PCS energy replenishment control algorithm is turned off. After the PCS current drops to 0, the control device controls the reduction of the test side current of the test valve device. Then all energy storage modules are locked, and finally the PCS is locked.

[0101] In the energy storage system provided in the embodiment of the present application, the filtering circuit can filter the current provided by the AC power grid and input the filtered current into the processing device. The processing device rectifies the filtered current and controls the duty cycle of the pulse signal of the internal switching tube, thereby outputting a replenishing current for replenishing the energy storage system. This solution can reduce the complexity of replenishing the energy storage system and is relatively easy to implement.

[0102] FIG9 is a flow chart of a method for replenishing energy in an energy storage system according to an embodiment of the present application. The method can be applied to the processing device in FIG1 , and includes the following steps S901-S903:

[0103] S901 : While testing the operation of the energy storage system, obtain a first state of charge of the energy storage system.

[0104] In one possible implementation, when testing the operation of the energy storage system, the control device can obtain the SOC of each valve device, determine the total SOC of the energy storage system based on the SOC of each valve device, and send the total SOC to the processing device. The total SOC is the first state of charge of the energy storage system, so that the processing device obtains the first state of charge of the energy storage system.

[0105] In another possible implementation, the control device may obtain the SOC of each valve device and send the SOC of each valve device to the processing device, and the processing device determines the first state of charge of the energy storage system based on the SOC of each valve device.

[0106] S902: Determine a first energy replenishment current reference value according to the first state of charge and a first preset state of charge.

[0107] If the first state of charge is greater than or equal to the first preset state of charge, it means that the energy storage system does not need to be recharged. In this case, there is no need to determine the first recharge current reference value.

[0108] If the first state of charge is less than the first preset state of charge, it means that the energy storage system needs to be recharged. If the processing device determines that the energy storage system needs to be recharged, the processing device can determine the difference between the first state of charge and the first preset state of charge, and determine a first recharge current reference value based on the difference.

[0109] The processing device may determine a proportional value and an integral value based on the difference, and determine the first energy replenishment current reference value based on the proportional value and the integral value. For example, the sum of the proportional value and the integral value may be used as the first energy replenishment current reference value, or the sum of the product of the proportional value multiplied by a first preset coefficient and the product of the integral value multiplied by a second preset coefficient may be used as the first energy replenishment current reference value.

[0110] S903: Charge the energy storage system based on the first energy replenishment current reference value.

[0111] Exemplarily, the processing device outputs a charging current equal to the first charging current reference value based on the first charging current reference value to charge the energy storage system. Alternatively, the processing device corrects the first charging current reference value to obtain a second charging current reference value, and the processing device outputs a charging current equal to the second charging current reference value based on the second charging current reference value to charge the energy storage system.

[0112] The energy storage system recharging method provided in the embodiment of the present application can realize online energy recharging when testing the operation of the energy storage system. There is no need to remove the test valve device and the accompanying test valve device with a lower charge state from the energy storage system for charging. Therefore, the work of rewiring the valve device is omitted, which saves time and improves the testing efficiency of the energy storage system.

[0113] In one embodiment, as shown in Figure 10, which is a flow chart of a method for determining a first charging current reference value provided in an embodiment of the present application, the above-mentioned S902, determining the first charging current reference value based on the first state of charge and the first preset state of charge, may include the following steps S1001-S1002.

[0114] S1001: If the first state of charge is less than a first preset state of charge, determine a difference between the first preset state of charge and the first state of charge.

[0115] S1002: Determine a first energy replenishment current reference value based on the difference.

[0116] Related energy replenishment schemes for converter valves require real-time calculation of the active power lost by the converter valve test system, and then recharging the converter valve test system based on the lost active power. However, the scheme for real-time calculation of the active power lost by the converter valve test system is relatively complex, and therefore the energy replenishment scheme is relatively complex. The energy storage system energy replenishment method provided in the embodiments of the present application can achieve online energy replenishment when testing the operation of the energy storage system. Furthermore, since the first energy replenishment current reference value can be determined based on the magnitude of the first state of charge and the first preset state of charge, and the energy storage system can be charged based on the first energy replenishment current reference value, the scheme is relatively easy to implement.

[0117] Furthermore, the converter valve recharge solution is difficult to apply to energy storage systems and is difficult to simulate the actual operating conditions of energy storage systems, which can easily lead to voltage imbalances in energy storage modules. However, the recharge method provided in the embodiments of the present application can simulate the actual operating conditions of energy storage systems, improve voltage balance between energy storage modules, and thus enhance safety during the recharge process.

[0118] In one embodiment, as shown in Figure 11, which is a flowchart of a method for charging an energy storage system according to an embodiment of the present application, the above-mentioned S903, charging the energy storage system based on the first energy replenishment current reference value, may include the following steps S1101-S1102.

[0119] S1101 , determining a test-side current of a test-side valve device of an energy storage system according to a test-side current of the test valve device and a first energy compensation current reference value.

[0120] The test-side current of the tested valve device can be a preset current value. That is, after the accompanying test valve device and the tested valve device begin operation, the test-side current of the tested valve device gradually reaches the preset current value under the action of the current control algorithm of the accompanying test valve device and the tested valve device. When the test-side current reaches this preset current value, it means that the energy storage system has reached a stable state during the push test. The accompanying test valve device of the energy storage system can be determined based on the test-side current when the energy storage system reaches a stable state and the first energy compensation current reference value. The accompanying test side current Ism1 = -Ism2 + Iref.

[0121] S1102: Charge the energy storage system based on the test-side current, the first energy replenishment current reference value, and the rated current of the test valve device.

[0122] It can be determined whether the current on the test side is greater than the rated current. If the current on the test side is greater than the rated current, the first energy replenishment current reference value is adjusted to obtain a second energy replenishment current reference value, and the second energy replenishment current reference value is made not greater than the sum of the rated current and the test side current.

[0123] The energy storage system charging method provided in the embodiment of the present application charges the energy storage system based on the test side current, the first energy charging current reference value, and the rated current of the test valve device, thereby current limiting the test side current, reducing the probability of the test side current being greater than the rated current, and improving the safety of the energy storage system during charging.

[0124] In one embodiment, as shown in Figure 12, which is a second flow chart of a method for charging an energy storage system provided in an embodiment of the present application, the aforementioned S1102, charging the energy storage system based on the test-side current, the first energy replenishment current reference value, and the rated current of the test valve device, may include the following steps S1201-S1202.

[0125] S1201: If the current on the test side is greater than the rated current, the first energy replenishment current reference value is adjusted to obtain a second energy replenishment current reference value.

[0126] S1202: Charge the energy storage system based on the second energy replenishment current reference value.

[0127] The energy storage system charging method provided in the embodiment of the present application adjusts the first energy charging current reference value to obtain the second energy charging current reference value, thereby adjusting the first energy charging current reference value to improve the safety of the energy storage system during charging.

[0128] In one embodiment, as shown in FIG13, FIG13 is a flow chart of adjusting the first energy replenishment current reference value to obtain the second energy replenishment current reference value provided by the embodiment of the present application. The above-mentioned step S1201 of "adjusting the first energy replenishment current reference value to obtain the second energy replenishment current reference value" may include the following steps S1301-S1302.

[0129] S1301, determine the sum of the rated current and the test side current.

[0130] S1302: Adjust the first energy replenishment current reference value based on the summation result to obtain a second energy replenishment current reference value; the second energy replenishment current reference value is not greater than the summation result.

[0131] The energy storage system charging method provided in the embodiment of the present application charges the energy storage system by using a second charging current reference value that is no greater than the sum of the rated current and the test side current, thereby improving the safety of the energy storage system during charging.

[0132] In one embodiment, the above-mentioned S1101, determining the test-side current of the accompanying test valve device of the energy storage system according to the test-side current of the tested valve device and the first energy compensation current reference value, can be implemented as follows:

[0133] The current difference between the first energy compensation current reference value and the test side current is determined, and the accompanying test side current is determined according to the current difference.

[0134] In the embodiment of the present application, the current difference between the first energy compensation current reference value and the test side current can be used as the accompanying test side current. Alternatively, the product obtained by multiplying the current difference by a preset coefficient can be used as the accompanying test side current.

[0135] The energy storage system recharging method provided in the embodiment of the present application determines the test side current and then compares the test side current with the rated current of the test valve device, thereby reducing the probability that the test side current is greater than the rated current and improving the safety of recharging the energy storage system.

[0136] In one embodiment, when the energy storage system is charged based on the first energy replenishment current reference value, a second state of charge of the energy storage system is obtained; if the second state of charge is greater than or equal to a second preset state of charge, charging of the energy storage system is stopped.

[0137] In an embodiment of the present application, to reduce the frequency of recharging the energy storage system, a second state of charge (SOC) of the energy storage system can be obtained while the energy storage system is being charged based on a first recharging current reference value. If the second SOC is greater than or equal to a second preset SOC, charging of the energy storage system is stopped. That is, while the energy storage system is being charged, it can be determined whether the second SOC of the energy storage system has reached a preset upper limit. If the SOC reaches or exceeds the upper limit, charging of the energy storage system is stopped. During this process, the energy storage system can be tested continuously.

[0138] As shown in Figure 14, Figure 14 is a second flow chart of the energy storage system energy replenishment method provided in an embodiment of the present application. The method may include the following steps S1401-S1402.

[0139] S1401 : While testing the operation of the energy storage system, obtain a first state of charge of the energy storage system.

[0140] S1402: If the first state of charge is less than a first preset state of charge, determine a difference between the first preset state of charge and the first state of charge.

[0141] S1403: Determine a first energy replenishment current reference value based on the difference.

[0142] S1404: Determine the test-side current of the test-side valve device of the energy storage system according to the test-side current of the test valve device and the first energy compensation current reference value.

[0143] S1405: If the current on the test side is greater than the rated current, determine the sum of the rated current and the current on the test side.

[0144] S1406 , adjusting the first energy replenishment current reference value based on the summation result to obtain a second energy replenishment current reference value; the second energy replenishment current reference value is not greater than the summation result.

[0145] S1407: Charge the energy storage system based on the second energy replenishment current reference value.

[0146] 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.

[0147] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in FIG15 . 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 XX data. 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 method for replenishing energy for an energy storage system is implemented.

[0148] Those skilled in the art will understand that the structure shown in FIG15 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 arrangement of components.

[0149] 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:

[0150] While testing the operation of the energy storage system, obtaining a first state of charge of the energy storage system; determining a first energy replenishment current reference value according to the first state of charge and a first preset state of charge;

[0151] The energy storage system is charged based on the first energy replenishment current reference value.

[0152] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0153] If the first state of charge is less than the first preset state of charge, a difference between the first preset state of charge and the first state of charge is determined; and a first charging current reference value is determined based on the difference.

[0154] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0155] According to the tested side current of the tested valve device and the first energy replenishment current reference value, the accompanying test side current of the accompanying test valve device of the energy storage system is determined; based on the accompanying test side current, the first energy replenishment current reference value and the rated current of the accompanying test valve device, the energy storage system is charged.

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

[0157] If the current on the test side is greater than the rated current, the first energy replenishment current reference value is adjusted to obtain a second energy replenishment current reference value; and the energy storage system is charged based on the second energy replenishment current reference value.

[0158] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0159] Determine the sum of the rated current and the test side current; adjust the first energy replenishment current reference value based on the summation result to obtain a second energy replenishment current reference value; the second energy replenishment current reference value is not greater than the summation result.

[0160] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0161] The current difference between the first energy compensation current reference value and the test side current is determined, and the accompanying test side current is determined according to the current difference.

[0162] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0163] When the energy storage system is charged based on the first energy replenishment current reference value, a second state of charge of the energy storage system is obtained; if the second state of charge is greater than or equal to a second preset state of charge, charging of the energy storage system is stopped.

[0164] 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:

[0165] While testing the operation of the energy storage system, obtaining a first state of charge of the energy storage system; determining a first energy replenishment current reference value according to the first state of charge and a first preset state of charge;

[0166] The energy storage system is charged based on the first energy replenishment current reference value.

[0167] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0168] If the first state of charge is less than the first preset state of charge, a difference between the first preset state of charge and the first state of charge is determined; and a first charging current reference value is determined based on the difference.

[0169] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0170] According to the tested side current of the tested valve device and the first energy replenishment current reference value, the accompanying test side current of the accompanying test valve device of the energy storage system is determined; based on the accompanying test side current, the first energy replenishment current reference value and the rated current of the accompanying test valve device, the energy storage system is charged.

[0171] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0172] If the current on the test side is greater than the rated current, the first energy replenishment current reference value is adjusted to obtain a second energy replenishment current reference value; and the energy storage system is charged based on the second energy replenishment current reference value.

[0173] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0174] Determine the sum of the rated current and the test side current; adjust the first energy replenishment current reference value based on the summation result to obtain a second energy replenishment current reference value; the second energy replenishment current reference value is not greater than the summation result.

[0175] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0176] The current difference between the first energy compensation current reference value and the test side current is determined, and the accompanying test side current is determined according to the current difference.

[0177] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0178] When the energy storage system is charged based on the first energy replenishment current reference value, a second state of charge of the energy storage system is obtained; if the second state of charge is greater than or equal to a second preset state of charge, charging of the energy storage system is stopped.

[0179] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0180] While testing the operation of the energy storage system, obtaining a first state of charge of the energy storage system; determining a first energy replenishment current reference value according to the first state of charge and a first preset state of charge;

[0181] The energy storage system is charged based on the first energy replenishment current reference value.

[0182] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0183] If the first state of charge is less than the first preset state of charge, a difference between the first preset state of charge and the first state of charge is determined; and a first charging current reference value is determined based on the difference.

[0184] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0185] According to the tested side current of the tested valve device and the first energy replenishment current reference value, the accompanying test side current of the accompanying test valve device of the energy storage system is determined; based on the accompanying test side current, the first energy replenishment current reference value and the rated current of the accompanying test valve device, the energy storage system is charged.

[0186] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0187] If the current on the test side is greater than the rated current, the first energy replenishment current reference value is adjusted to obtain a second energy replenishment current reference value; and the energy storage system is charged based on the second energy replenishment current reference value.

[0188] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0189] Determine the sum of the rated current and the test side current; adjust the first energy replenishment current reference value based on the summation result to obtain a second energy replenishment current reference value; the second energy replenishment current reference value is not greater than the summation result.

[0190] In one embodiment, when the computer program is executed by a processor, the following steps are further implemented:

[0191] The current difference between the first energy compensation current reference value and the test side current is determined, and the accompanying test side current is determined according to the current difference.

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

[0193] When the energy storage system is charged based on the first energy replenishment current reference value, a second state of charge of the energy storage system is obtained; if the second state of charge is greater than or equal to a second preset state of charge, charging of the energy storage system is stopped.

[0194] 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.

[0195] 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.

[0196] 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.

[0197] 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 includes a control device, a processing device, an energy supplement power supply and two valve devices, wherein the two valve devices include a tested valve device and a companion test valve device connected to the tested valve device; The processing device is connected to each of the valve devices, the control device and the energy supplement power supply, and each of the valve devices is connected to the control device; Each of the valve devices 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.

2. The energy storage system according to claim 1, wherein: The first end of the processing device is connected to the low-pressure end of the tested valve device and the low-pressure end of the accompanying test valve device; The second end of the processing device is connected to the high-pressure end of the tested valve device and the high-pressure end of the accompanying test valve device.

3. The energy storage system according to claim 1 or 2, wherein: The energy storage system further includes a reactor; The accompanying test valve device is connected to the tested valve device through the reactor, and the second end of the processing device is connected to the reactor.

4. The energy storage system according to claim 3, wherein: The reactor includes a first reactor; The high-pressure end of the test valve device and the second end of the processing device are connected to the first end of the first reactor, and the second end of the first reactor is connected to the high-pressure end of the tested valve device.

5. The energy storage system according to claim 4, wherein: The reactor further includes a second reactor; The first end of the first reactor is connected to the first end of the second reactor, and the second end of the second reactor is connected to the high-voltage end of the test valve device; The second end of the processing device is connected to the first end of the first reactor and the first end of the second reactor.

6. The energy storage system according to any one of claims 1 to 5, wherein: The energy supplement power supply includes an AC power grid and a filter circuit, and the processing device is connected to the AC power grid through the filter circuit.

7. A method for replenishing energy in an energy storage system, wherein: The energy replenishment method is applied to a processing device in an energy storage system according to any one of claims 1 to 6; the method comprises: obtaining a first state of charge of the energy storage system while testing the operation of the energy storage system; determining a first charging current reference value according to the first state of charge and a first preset state of charge; The energy storage system is charged based on the first energy replenishment current reference value.

8. The method according to claim 7, wherein: The determining a first energy replenishment current reference value according to the first state of charge and a first preset state of charge includes: If the first state of charge is less than the first preset state of charge, determining a difference between the first preset state of charge and the first state of charge; The first energy replenishment current reference value is determined based on the difference.

9. The method according to claim 7 or 8, wherein The charging the energy storage system based on the first energy replenishment current reference value includes: Determining a test-side current of a test-side accompanying valve device of the energy storage system according to a test-side current of the test valve device and the first energy-compensating current reference value; The energy storage system is charged based on the test-side current, the first energy replenishment current reference value, and the rated current of the test valve device.

10. The method according to claim 9, wherein: The method of charging the energy storage system based on the accompanying test side current, the first energy compensation current reference value, and the rated current of the accompanying test valve device includes: If the test side current is greater than the rated current, adjusting the first energy replenishment current reference value to obtain a second energy replenishment current reference value; The energy storage system is charged based on the second energy replenishment current reference value.

11. The method according to claim 10, wherein: The adjusting the first energy replenishment current reference value to obtain the second energy replenishment current reference value includes: Determining a sum of the rated current and the test side current; The first energy replenishment current reference value is adjusted based on the summation result to obtain the second energy replenishment current reference value; the second energy replenishment current reference value is not greater than the summation result.

12. The method according to any one of claims 9 to 11, wherein: The determining, based on the tested side current of the tested valve device and the first energy compensation current reference value, of the accompanying test valve device of the energy storage system comprises: A current difference between the first energy compensation current reference value and the test side current is determined, and the accompanying test side current is determined according to the current difference.

13. The method according to any one of claims 7 to 12, wherein: The method further comprises: acquiring a second state of charge of the energy storage system when charging the energy storage system based on the first energy replenishment current reference value; If the second state of charge is greater than or equal to a second preset state of charge, charging of the energy storage system is stopped.

14. 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 13 are implemented.

15. 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 13 are implemented.

16. 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 13 are implemented.

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