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 supplement method of energy storage system, device, medium and program product CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on the Chinese Patent Application No. 2024103310319 entitled "Energy storage system, energy supplement method of energy storage system, device, medium and program product" filed on March 21, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

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

[0003] An energy storage system is composed of multiple energy storage modules, and the operation reliability of the energy storage modules is crucial. Therefore, it is necessary to test the operation of the energy storage modules to verify the operation performance of the energy storage modules. During the test operation, the energy of the energy storage system in the power cycle is provided by the energy storage units of the energy storage modules. However, since the total energy of the energy storage system gradually decreases, it is necessary to provide energy supply to the energy storage units by an external energy supplement power supply.

[0004] In the current test platform, an offline energy supplement scheme is usually adopted, that is, the tested valve device and the accompanying tested valve device in a lower state of charge are cut off from the energy storage system for charging. After the charging is completed, the wiring needs to be reconnected to continue the test. Therefore, the offline energy supplement scheme affects the test efficiency, resulting in a low test efficiency. SUMMARY

[0005] Therefore, it is necessary to provide an energy storage system, an energy supplement method of energy storage system, a device, a medium and a program product for improving the test efficiency of the energy storage system to solve the above technical problems.

[0006] In a first aspect, the present application provides an energy storage system, which comprises a control device, a processing device, an energy supplement power supply and two valve devices, the two valve devices comprising a tested valve device and an accompanying tested valve device connected with the tested valve device.

[0007] The processing device is connected with each valve device, the control device and the energy supplement power supply, and each valve device is connected with the control device.

[0008] Each valve device comprises one energy storage module or at least two energy storage modules connected in series, and the energy storage module comprises a power unit and an energy storage unit connected in parallel with the power unit.

[0009] The energy storage system provided by the embodiment of the present application is connected with the valve device and the control device, so that the control device can obtain the SOC of each valve device when the operation of the energy storage system is tested, and the total SOC of the energy storage system is obtained based on the SOC of each valve device. Meanwhile, the processing device is connected with the control device and the energy supplement power supply, so that 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 supplemented by the energy supplement power supply based on the total SOC, so that the online energy supplement is realized when the operation of the energy storage system is tested, and the valve device with low SOC does not need to be charged after being cut off from the energy storage system, so that the work of modifying the connection line of the valve device is saved, time is saved, and the test efficiency of the energy storage system is improved. That is, the embodiment of the present application can supplement the energy storage system while testing the operation of the energy storage system, time and modification cost are saved, and the test efficiency of the energy storage system is improved.

[0010] In one of the embodiments, the first end of the processing device is connected with the low-voltage end of the test valve device and the low-voltage end of the test valve device.

[0011] The second end of the processing device is connected with the high-voltage end of the test valve device and the high-voltage end of the test valve device.

[0012] The energy storage system provided by the embodiment of the present application can realize the online energy supplement of the valve device when the operation of the energy storage system is tested, the valve device with low SOC does not need to be charged after being cut off from the energy storage system, so that the test efficiency of the energy storage system is improved, and the actual operation of the energy storage module can be effectively simulated.

[0013] In one of the embodiments, the energy storage system further comprises a reactor.

[0014] The test valve device is connected with the test valve device through the reactor, and the second end of the processing device is connected with the reactor.

[0015] The energy storage system provided by the embodiment of the present application can realize the voltage balance between the test valve device and the test valve device through the reactor, and reduce the current harmonic between the test valve device and the test valve device.

[0016] In one of the embodiments, the reactor comprises a first reactor.

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

[0018] The energy storage system provided in the embodiments of the present application can realize voltage balance between the test valve device and the test valve device through the first reactor, and reduce current harmonics between the test valve device and the test valve device.

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

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

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

[0022] The energy storage system provided in the embodiments of the present application can realize voltage balance between the test valve device and the test valve device through the first reactor and the second reactor, and reduce current harmonics between the test valve device and the test valve device.

[0023] In one of the embodiments, the energy supplement power supply comprises an alternating current grid and a filter circuit, and the processing device is connected with the alternating current grid through the filter circuit.

[0024] The energy storage system provided in the embodiments of the present application can filter the current provided by the alternating current grid through the filter circuit, input the filtered current to the processing device, rectify the filtered current by the processing device, and control the duty cycle of the pulse signal of the internal switch tube, so as to output the energy supplement current for supplementing the energy of the energy storage system. The scheme can reduce the complexity of supplementing the energy of the energy storage system and is easier to implement.

[0025] In a second aspect, the present application further provides an energy supplement method of an energy storage system. The energy supplement method is applied to the processing device in any of the energy storage systems described above. The method comprises the following steps:

[0026] In the case of testing the operation of the energy storage system, the first state of charge of the energy storage system is obtained.

[0027] According to the first state of charge and the first preset state of charge, the first energy supplement current reference value is determined.

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

[0029] In a third aspect, the present application further provides a computer device. The computer device comprises a memory and a processor. The memory stores a computer program, and the processor implements the steps of the method provided in the above embodiments when executing the computer program.

[0030] In a fourth aspect, the present application provides a computer readable storage medium. The computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the steps of the method provided in the above embodiments.

[0031] In a fifth aspect, the present application provides a computer program product. The computer program product comprises a computer program. The computer program is executed by a processor to implement the steps of the method provided in the above embodiments.

[0032] The above description is merely a summary of the technical solutions of the present application. In order to enable one of ordinary skill in the art to better understand the technical means of the present application and implement the same according to the contents of the description, and in order to enable the above and other purposes, features and advantages of the present application to be more apparent, the following specific embodiments of the present application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting the present application. Moreover, in the drawings, like reference numerals refer to same or similar components throughout the several views. In the drawings:

[0034] FIG. 1 is a structural schematic diagram of a kind of energy storage system provided in the embodiments of the present application;

[0035] FIG. 2 is a structural schematic diagram of the energy storage module in the form of half-bridge topology provided in the embodiments of the present application;

[0036] FIG. 3 is a structural schematic diagram of the energy storage module in the form of full-bridge topology provided in the embodiments of the present application;

[0037] FIG. 4 is a structural schematic diagram of a kind of energy storage system provided in the embodiments of the present application;

[0038] FIG. 5 is a control block diagram of the output of the energy supply current of the processing device provided in the embodiments of the present application;

[0039] FIG. 6 is a structural schematic diagram of a kind of energy storage system provided in the embodiments of the present application;

[0040] FIG. 7 is a structural schematic diagram of a kind of energy storage system provided in the embodiments of the present application;

[0041] FIG. 8 is a structural schematic diagram of a kind of energy storage system provided in the embodiments of the present application;

[0042] FIG. 9 is a flow schematic diagram of the energy supply method of the energy storage system provided in the embodiments of the present application;

[0043] FIG. 10 is a flow schematic diagram of the first energy supply current reference value determination method provided in the embodiments of the present application;

[0044] FIG. 11 is a flowchart of a method for charging an energy storage system according to an embodiment of the present application;

[0045] FIG. 12 is a flowchart of a method for charging an energy storage system according to an embodiment of the present application;

[0046] FIG. 13 is a flowchart of a method for adjusting a first energy supplement current reference value to obtain a second energy supplement current reference value according to an embodiment of the present application;

[0047] FIG. 14 is a flowchart of a method for supplementing energy of an energy storage system according to an embodiment of the present application;

[0048] FIG. 15 is a block diagram of an internal structure of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] The embodiments of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot be used to limit the protection scope of the present application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used in the specification and claims herein, are intended to cover not only the recited elements but also any additional elements.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0052] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term ''and / or'' is merely an association relationship of associated objects, and indicates that there can be three relationships, for example, A and / or B, which can represent three cases of A existing alone, A and B existing simultaneously, and B existing alone. In addition, the character '' / '' herein generally represents an ''or'' relationship of the associated objects before and after.

[0054] In the description of the embodiments of the present application, the term ''a plurality of'' refers to two or more (including two), and similarly, ''a plurality of groups'' refers to two or more groups (including two groups), and ''a plurality of pieces'' refers to two or more pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the technical terms ''center'', ''longitudinal'', ''transverse'', ''length'', ''width'', ''thickness'', ''upper'', ''lower'', ''front'', ''rear'', ''left'', ''right'', ''vertical'', ''horizontal'', ''top'', ''bottom'', ''inner'', ''outer'', ''clockwise'', ''counterclockwise'', ''axial'', ''radial'', ''circumferential'', and the like indicate the orientation or positional relationship shown based on the drawings, and are merely for the convenience of describing the embodiments of the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular 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 explicitly specified and limited, the technical terms ''mounting'', ''connection'', ''connection'', ''fixing'', and the like should be understood broadly, for example, can be fixed connection, or can be detachable connection, or can be integrated; can be mechanical connection, or can be electrical connection; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] The energy storage system is composed of a plurality of energy storage modules, and the operation reliability of the energy storage modules is crucial, so it is necessary to test the operation of the energy storage modules to verify the operation performance of the energy storage modules. During the test operation, the energy of the energy storage system in the power cycle process is provided by the energy storage units of each energy storage module. However, since the total energy of the energy storage system gradually decreases, it is necessary to provide energy supply to the energy storage units through an external energy supply power source.

[0058] In the current test platform, an offline energy supplement scheme is usually adopted, that is, the tested valve device and the accompanying tested valve device in a lower state of charge are cut off from the energy storage system for charging, and after charging is completed, the wiring needs to be reconnected to continue the test. Therefore, the offline energy supplement scheme affects the test efficiency, resulting in low test efficiency.

[0059] To solve the above technical problems, the embodiment of the present application provides a kind of energy storage system, energy storage system includes control device, processing device, energy supplement power supply and two valve devices, two valve devices include test valve device and the test valve device connected with accompanying test valve device;Processing device is connected with each valve device, control device and energy supplement power supply, and each valve device is connected with control device;Each valve device includes one energy storage module or at least two energy storage modules in series, and the energy storage module includes power unit and energy storage unit connected with power unit in parallel.

[0060] In the embodiment of the present application, since each valve device is connected with the control device, the control device can obtain the state of charge (SOC) of each valve device when testing the operation of the energy storage system, 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 with the control device and the energy supplement 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 energized by the energy supplement power supply based on the total SOC, so that the valve device can be energized online when testing the operation of the energy storage system. Therefore, the test valve device and the accompanying test valve device with low state of charge do not need to be removed from the energy storage system for charging, and the work of modifying the wiring of the valve device is saved, time is saved, and the test efficiency of the energy storage system is improved. That is, the embodiment of the present application can test the operation of the energy storage system while energizing the energy storage system, save time and modify the wiring work cost, and improve the test efficiency of the energy storage system.

[0061] The test of the operation of the energy storage system can be a push test, and any one of the two valve devices can be used as a test valve device, and the other as an accompanying test valve device, so as to realize the push test of the operation of the energy storage system.

[0062] In one embodiment, as shown in FIG. 1, FIG. 1 is one of the structure schematic diagrams of the energy storage system provided by the embodiment of the present application, as shown in FIG. 1, the energy storage system includes control device 11, processing device 12, energy supplement power supply 13 and two valve devices, two valve devices include test valve device 14 and accompanying test valve device 15 connected with test valve device 14;

[0063] Processing device 12 is connected with each valve device, control device 11 and energy supplement power supply 13, and each valve device is connected with control device 11.

[0064] Each valve device includes one energy storage module or at least two energy storage modules in series, and the energy storage module includes power unit and energy storage unit connected with power unit in parallel.

[0065] In the embodiments of the present application, the valve device can be a valve tower or a container; the plurality of energy storage modules can be arranged in series in the valve tower, or arranged in the container in a manner different from the valve tower.

[0066] The processing device 12 can include a power conversion system (PCS) and a rectifier. In a possible implementation, the power supply 13 can include a filter circuit and an alternating current grid, and the filter circuit is arranged between the processing device 12 and the alternating current grid.

[0067] In another possible implementation, the power supply 13 can include a transformer and an alternating current grid, and the filter circuit is arranged between the processing device 12 and the alternating current grid.

[0068] The energy storage module can be a half-bridge topology energy storage module or a full-bridge topology energy storage module, as shown in FIG. 2 and FIG. 3. FIG. 2 is a structural schematic diagram of the half-bridge topology energy storage module according to an embodiment of the present application, and FIG. 3 is a structural schematic diagram of the full-bridge topology energy storage module according to an embodiment of the present application.

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

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

[0071] The energy storage system provided in the embodiments of the present application is connected with the valve devices and the control device, so that the control device can obtain the SOC of each valve device when the operation of the energy storage system is tested, and the total SOC of the energy storage system is obtained based on the SOC of each valve device. Meanwhile, the processing device is connected with the control device and the energy supplement power supply, so that 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 supplemented with energy by the energy supplement power supply based on the total SOC, so as to realize online energy supplement when the operation of the energy storage system is tested, and the valve device with low SOC and the valve device for testing do not need to be charged after being cut off from the energy storage system, so that the work of modifying the connection line of the valve device is saved, time is saved, and the test efficiency of the energy storage system is improved. That is, the embodiments of the present application can supplement the energy storage system while testing the operation of the energy storage system, save time and modification work cost, and improve the test efficiency of the energy storage system.

[0072] In one of the embodiments, as shown in FIG. 4, which is a structure diagram of an energy storage system provided in the embodiments of the present application, the first end of the processing device 12 is connected with the low-pressure end of the valve device for testing 14 and the low-pressure end of the valve device for testing 15.

[0073] The second end of the processing device 12 is connected with the high-pressure end of the valve device for testing 14 and the high-pressure end of the valve device for testing 15.

[0074] In the embodiments of the present application, when the operation of the energy storage system is tested, the control device can obtain the SOC of each valve device, 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, and if the total SOC is less than the first preset SOC, it means that the energy storage system needs to be supplemented with energy. When the processing device determines that the energy storage system needs to be supplemented with energy, the processing device can determine the difference between the total SOC and the first preset SOC, determine the first energy supplement current reference value based on the difference, and charge the energy storage system based on the first energy supplement current reference value. The total SOC can be equal to the sum of the SOCs of the valve devices, or can be equal to a value obtained by modifying the sum. The product obtained by multiplying the sum by a preset coefficient can be used as the total SOC, and the sum can be modified.

[0075] The charging of the energy storage system based on the first energy supplement current reference value can be realized in the following ways:

[0076] In a possible implementation, the processing device outputs the energy supplement current after processing the current provided by the energy supplement power supply based on the first energy supplement current reference value, and supplements the valve device with the energy supplement current. The energy supplement current can be a current close to or equal to the first energy supplement current reference value. Since the first end of the processing device is connected to the low-voltage end of the test valve device and the low-voltage end of the companion valve device, and the second end of the processing device is connected to the high-voltage end of the test valve device and the high-voltage end of the companion valve device, the energy supplement current output by the processing device can supplement the valve device without charging the valve device with a lower state of charge from the energy storage system, thereby improving the test efficiency of the energy storage system.

[0077] In another possible implementation, it is assumed that the companion side current of the companion valve device is Ism1, the test side current of the test valve device is Ism2, and the energy supplement current reference value of the processing device is Iref. The energy supplement current I≥0 output by the processing device. To reduce the probability that the companion side current Ism1 of the companion valve device is greater than the rated current Imax, the current limit of the companion side current needs to be increased. Therefore, if -Ism2+Iref>Imax, the first energy supplement current reference value needs to be adjusted to determine the second energy supplement current reference value, that is, the determined energy supplement current reference value is less than or equal to Imax+Ism2, that is, the second energy supplement current reference value is less than or equal to Imax+Ism2. After determining the second energy supplement current reference value, the processing device outputs the energy supplement current after processing the current provided by the energy supplement power supply based on the second energy supplement current reference value, and supplements the valve device with the energy supplement current. The energy supplement current can be a current close to or equal to the second energy supplement current reference value. It should be noted that the case that the companion side current Ism1 of the companion valve device is greater than the rated current Imax only exists when the test valve device charges the companion valve device, that is, the test side current Ism2 of the test valve device is less than 0. It should be noted that, in order to improve the charging efficiency, Imax+Ism2 can be used as the second energy supplement current reference value.

[0078] In the two implementation manners, the output of the compensating current of the processing device can refer to FIG. 5, which is a control block diagram of the output of the compensating current of the processing device according to 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 trial valve device and the SOC of the test valve device, compare the first SOC with a first preset state of charge, determine a difference between the first SOC and the first preset state of charge if the first SOC is less than the first preset state of charge, determine a first compensating current reference value based on the difference, determine a duty cycle of a pulse signal output by the SVPWM module based on the first compensating current reference value, and control an actual compensating current output by the PCS to be equal to a compensating current reference value Iref of the PCS. The compensating current reference value Iref can be the first compensating current reference value or a second compensating current reference value.

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

[0080] The energy storage system provided by the embodiments of the present application can realize online compensating of the valve device in the case of testing the operation of the energy storage system, and the trial valve device and the test valve device in a lower state of charge do not need to be charged after being cut off from the energy storage system, thereby improving the test efficiency of the energy storage system and effectively simulating the actual operation of the energy storage module.

[0081] In one of the embodiments, the energy storage system further comprises a reactor;

[0082] The test valve device 15 is connected with the subject valve device 14 through the reactor, and the second end of the processing device 12 is connected with the reactor.

[0083] The number of the reactor can be one or more, and the reactor can include but is not limited to the following forms. A plurality of reactors can be connected in parallel to form a reactor module, and the test valve device 15 is connected with the subject valve device 14 through the reactor module. Alternatively, a plurality of reactors can be connected in series to form a reactor module, and the test valve device 15 is connected with the subject valve device 14 through the reactor module. Alternatively, a plurality of reactors can be connected in series and in parallel to form a reactor module, and the test valve device 15 is connected with the subject valve device 14 through the reactor module.

[0084] The energy storage system provided by the embodiments of the present application can realize voltage balance between the test valve device and the subject valve device through the reactor, and reduce current harmonics between the test valve device and the subject valve device.

[0085] In one of the embodiments, as shown in FIG. 6, FIG. 6 is a structural schematic diagram of a kind of energy storage system provided by the embodiments of the present application. The reactor includes a first reactor 61;

[0086] The high voltage end of the test valve device 15 and the second end of the processing device 12 are connected with the first end of the first reactor 61, and the second end of the first reactor 51 is connected with the high voltage end of the subject valve device 14.

[0087] For example, the test valve device 15 includes a series of energy storage modules A1, energy storage modules A2, …, energy storage modules An; the subject valve device 14 includes a series of energy storage modules B1, energy storage modules B2, …, energy storage modules Bn, and n is an integer not less than 1. It should be noted that the number of energy storage modules included in the test valve device 15 and the subject valve device 14 can be equal or not equal.

[0088] The energy storage system provided by the embodiments of the present application can realize voltage balance between the test valve device and the subject valve device through the first reactor, and reduce current harmonics between the test valve device and the subject valve device.

[0089] In one of the embodiments, as shown in FIG. 7, FIG. 7 is a structural schematic diagram of a kind of energy storage system provided by the embodiments of the present application. The reactor further includes a second reactor 62;

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

[0091] The second end of the processing device 12 is connected with the first end of the first reactor 61 and the first end of the second reactor 62.

[0092] Optionally, the inductance value of the first reactor can be same as or different from the inductance value of the second reactor. In the case that the inductance value of the first reactor is same as the inductance value of the second reactor, the probability of voltage balance between the test valve device and the test valve device can be improved, and the current balance between the test valve device and the test valve device can be realized.

[0093] The energy storage system provided by the embodiment of the application can realize voltage balance between the test valve device and the test valve device through the first reactor and the second reactor, and reduce the current harmonics between the test valve device and the test valve device.

[0094] In one of the embodiments, as shown in FIG. 8, FIG. 8 is a structure schematic diagram of the energy storage system provided by the embodiment of the application. The energy supply source 13 includes a filter circuit 81 and an alternating current network 82, and the processing device is connected with the alternating current network 82 through the filter circuit 81.

[0095] Taking the processing device 12 shown in FIG. 8 as an example, the energy supply control process of the PCS is introduced. After the test valve device and the test valve device shown in FIG. 8 are started, a pre-charging resistor is connected, and then the switch tube in the PCS is unlocked. At this time, the energy supply control algorithm of the PCS is not started, the output current of the PCS gradually reaches 0, the reactive power of the PCS is 0, and the output end potential of the PCS is suspended.

[0096] After the output current of the PCS reaches 0, that is, after the PCS is stabilized, the PCS sends a first instruction to the control device, and the control device controls the switches of each energy storage module in the test valve device and the test valve device to be unlocked based on the first instruction. 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 a preset current value, and the power transmission starts. At the same time, the SOC balancing algorithm in the energy storage system works, and the SOC distribution is balanced by adjusting the current offset of each energy storage module. Since the output current of the PCS is 0, the test of the energy storage system is not affected.

[0097] In a case where the current on the test side of the test valve device reaches the preset current value, it means that the energy storage system reaches a stable state. In a case where the energy storage system reaches the stable state, the energy compensation control algorithm of the PCS is started, 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. In a case where the total SOC is less than the first preset SOC, a difference between the total SOC and the first preset SOC is determined, a first energy compensation current reference value is determined based on the difference, and an energy compensation current for compensating the energy storage system is output by the PCS current control algorithm based on the first energy compensation current reference value. The energy compensation current for compensating the energy storage system output by the PCS current control algorithm can be realized in the following manner:

[0098] The current output by the alternating current power grid is filtered by the filter circuit to obtain an intermediate current, the PCS rectifies the intermediate current, and controls the duty cycle of the pulse signal of the internal switch tube to realize the output of the energy compensation current for compensating the energy storage system. The output energy compensation current for compensating the energy storage system is equal to or close to equal to the first energy compensation current reference value, or can be equal to or close to equal to the second energy compensation current reference value.

[0099] In the embodiment of the application, in order to reduce the frequent action of compensating the energy storage system, the second state of charge of the energy storage system can be obtained in a case where the energy storage system is charged based on the first energy compensation current reference value; if the second state of charge is greater than or equal to the second preset state of charge, the 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 state of charge of the current energy storage system reaches a set upper limit value, and if it reaches or is greater than the upper limit value, the charging of the energy storage system is stopped, and in this process, the test of the energy storage system can continue.

[0100] The energy storage system is closed in reverse order, first, the energy compensation control algorithm of the PCS is closed, then the control device controls the reduction of the current on the test side of the test valve device after the PCS current is reduced to 0, and then all energy storage modules are locked, and finally the PCS is locked.

[0101] The energy storage system provided by the embodiment of the application can filter the current provided by the alternating current power grid through the filter circuit, and input the filtered current to the processing device. The processing device rectifies the filtered current, and controls the duty cycle of the pulse signal of the internal switch tube, so as to realize the output of the energy compensation current for compensating the energy storage system. This scheme can reduce the complexity of compensating the energy storage system and is easier to implement.

[0102] FIG. 9 is a flowchart of a method for compensating an energy storage system provided by an embodiment of the application, which can be applied to the processing device in FIG. 1, and includes the following steps S901-S903:

[0103] S901, in the case of testing the operation of the energy storage system, obtaining a first state of charge of the energy storage system.

[0104] In a possible implementation, in the case of 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, where 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 can obtain the SOC of each valve device, 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, determining a first energy supplement 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 supplemented, and in this case, the first energy supplement current reference value does not need to be determined.

[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 supplemented. In the case where the processing device determines that the energy storage system needs to be supplemented, the processing device can determine the difference between the first state of charge and the first preset state of charge, and determine the first energy supplement current reference value based on the difference.

[0109] Wherein, the processing device can determine a proportional value and an integral value based on the difference, and determine the first energy supplement current reference value according to the proportional value and the integral value. For example, the sum of the proportional value and the integral value can be taken as the first energy supplement current reference value, or 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 can be taken as the first energy supplement current reference value.

[0110] S903, charging the energy storage system based on the first energy supplement current reference value.

[0111] For example, the processing device outputs an energy supplement current with a size equal to the first energy supplement current reference value based on the first energy supplement current reference value to charge the energy storage system. Alternatively, the processing device corrects the first energy supplement current reference value to obtain a second energy supplement current reference value, and the processing device outputs an energy supplement current with a size equal to the second energy supplement current reference value based on the second energy supplement current reference value to charge the energy storage system.

[0112] The energy supplement method of the energy storage system provided in the embodiments of the present application can realize online energy supplement when the operation of the energy storage system is tested, and the tested valve device and the accompanying tested valve device in a lower state of charge do not need to be charged after being cut off from the energy storage system, so that the work of modifying the connection line of the valve device is saved, time is saved, and the test efficiency of the energy storage system is improved.

[0113] In one of the embodiments, as shown in FIG. 10, FIG. 10 is a flowchart of the method for determining the first energy supplement current reference value provided in the embodiments of the present application. The step S902 of determining the first energy supplement current reference value according to the first state of charge and the first preset state of charge can include the following steps S1001-S1002.

[0114] In the step S1001, if the first state of charge is less than the first preset state of charge, the difference between the first preset state of charge and the first state of charge is determined.

[0115] In the step S1002, the first energy supplement current reference value is determined based on the difference.

[0116] In the energy supplement scheme for the converter valve, the active power of the converter valve test system loss needs to be calculated in real time, and then the converter valve test system is supplemented based on the active power of the loss. However, the scheme for calculating the active power of the converter valve test system loss in real time is relatively complex, and therefore, the energy supplement scheme is relatively complex. However, the energy supplement method of the energy storage system provided in the embodiments of the present application can realize online energy supplement when the operation of the energy storage system is tested, and the first energy supplement current reference value can be determined according to the size of the first state of charge and the first preset state of charge, and then the energy storage system is charged based on the first energy supplement current reference value, so that the scheme is relatively easy to implement.

[0117] In addition, the energy supplement scheme for the converter valve is difficult to be applied to supplement the energy storage system, and is difficult to simulate the actual operation condition of the energy storage system, which is easy to cause the voltage imbalance among the energy storage modules. However, the energy supplement method provided in the embodiments of the present application can simulate the actual operation condition of the energy storage system, improve the voltage balance among the energy storage modules, and thus improve the safety during the energy supplement process.

[0118] In one of the embodiments, as shown in FIG. 11, FIG. 11 is one of the flowcharts of the method for charging the energy storage system provided in the embodiments of the present application. The step S903 of charging the energy storage system based on the first energy supplement current reference value can include the following steps S1101-S1102.

[0119] In the step S1101, the test side current of the accompanying tested valve device of the energy storage system is determined according to the test side current of the tested valve device and the first energy supplement current reference value.

[0120] The test side current of the test valve device can be a preset current value, that is, after the test valve device and the test valve device start to work, the test side current of the test valve device gradually reaches the preset current value under the action of the current control algorithm of the test valve device and the test valve device. In the case where the test side current reaches the preset current value, it means that the energy storage system reaches a steady state during the push test. The test side current of the test valve device of the energy storage system can be determined according to the test side current and the first energy supplement current reference value when the energy storage system reaches the steady state. The test side current Ism1=-Ism2+Iref.

[0121] In S1102, the energy storage system is charged based on the test side current, the first energy supplement current reference value, and the rated current of the test valve device.

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

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

[0124] In one of the embodiments, as shown in FIG. 12, FIG. 12 is a flowchart of a method for charging the energy storage system according to an embodiment of the present application. The above S1102, which charges the energy storage system based on the test side current, the first energy supplement current reference value, and the rated current of the test valve device, can include the following steps S1201-S1202.

[0125] In S1201, if the test side current is greater than the rated current, the first energy supplement current reference value is adjusted to obtain a second energy supplement current reference value.

[0126] In S1202, the energy storage system is charged based on the second energy supplement current reference value.

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

[0128] In one of the embodiments, as shown in FIG. 13, FIG. 13 is a flowchart of adjusting the first energy supplement current reference value to obtain the second energy supplement current reference value according to the embodiments of the present application. The step of "adjusting the first energy supplement current reference value to obtain the second energy supplement current reference value" in S1201 can include the following steps S1301-S1302.

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

[0130] S1302, adjusting the first energy supplement current reference value based on the sum to obtain the second energy supplement current reference value; the second energy supplement current reference value is not greater than the sum.

[0131] The energy supplement method of the energy storage system provided by the embodiments of the present application can charge the energy storage system by the second energy supplement current reference value which is not 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 of the embodiments, S1101 can be implemented by the following method.

[0133] Determining the current difference between the first energy supplement current reference value and the test side current, and determining the test side current according to the current difference.

[0134] In the embodiments of the present application, the current difference between the first energy supplement current reference value and the test side current can be used as the test side current. Alternatively, the product of the current difference and a preset coefficient can be used as the test side current.

[0135] The energy supplement method of the energy storage system provided by the embodiments of the present application can determine the test side current, and then compare 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 the energy storage system during energy supplement.

[0136] In one of the embodiments, in the case of charging the energy storage system based on the first energy supplement current reference value, the second state of charge of the energy storage system is obtained; if the second state of charge is greater than or equal to the second preset state of charge, the charging of the energy storage system is stopped.

[0137] In the embodiments of the present application, in order to reduce the action of frequently supplementing the energy storage system, the second state of charge of the energy storage system can be obtained in the case of charging the energy storage system based on the first supplement current reference value; if the second state of charge is greater than or equal to the second preset state of charge, the charging of the energy storage system is stopped. That is, while charging the energy storage system, it can be judged whether the second state of charge of the current energy storage system reaches the set upper limit value, and if it reaches or is greater than the upper limit value, the charging of the energy storage system is stopped, and in this process, the test of the energy storage system can continue.

[0138] As shown in FIG. 14, FIG. 14 is a flowchart of a supplement method of an energy storage system according to an embodiment of the present application. The method can include the following steps S1401-S1402.

[0139] S1401, in the case of testing the operation of the energy storage system, the first state of charge of the energy storage system is obtained.

[0140] S1402, if the first state of charge is less than the first preset state of charge, the difference between the first preset state of charge and the first state of charge is determined.

[0141] S1403, the first supplement current reference value is determined based on the difference.

[0142] S1404, the test side current of the test valve device of the energy storage system is determined according to the test side current of the test valve device and the first supplement current reference value.

[0143] S1405, if the test side current is greater than the rated current, the sum of the rated current and the test side current is determined.

[0144] S1406, the first supplement current reference value is adjusted based on the sum to obtain the second supplement current reference value; the second supplement current reference value is not greater than the sum.

[0145] S1407, the energy storage system is charged based on the second supplement current reference value.

[0146] It should be understood that although the steps in the flowcharts involved in the above embodiments are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the above embodiments can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of the steps or stages is not necessarily sequential, but can be alternately or alternately executed with at least part of other steps or steps in other steps.

[0147] In one embodiment, a computer device is provided, which can be a server, and an internal structure diagram thereof can be as shown in FIG. 15. The computer device includes a processor, a memory and a network interface connected through a system bus. The processor of the computer device is configured 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 running the operating system and the computer program in the non-volatile storage medium. The database of the computer device is configured to store XX data. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer program is executed by the processor to implement a method for supplementing energy of an energy storage system.

[0148] Those skilled in the art can understand that the structure shown in FIG. 15 is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. A specific computer device can include more or fewer components than those 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, the memory storing a computer program, and the processor executing the computer program to implement the following steps:

[0150] In the case of testing the running condition of the energy storage system, a first state of charge of the energy storage system is obtained; a first energy supplement current reference value is determined 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 supplement current reference value.

[0152] In one embodiment, the processor executing the computer program 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 the first energy supplement current reference value is determined based on the difference.

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

[0155] Based on the subject side current of the subject valve device and the first energy supplement current reference value, a partner side current of the partner valve device of the energy storage system is determined; and the energy storage system is charged based on the partner side current, the first energy supplement current reference value and the rated current of the partner valve device.

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

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

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

[0159] A sum result of the rated current and the subject side current is determined; the first energy supplement current reference value is adjusted based on the sum result to obtain a second energy supplement current reference value; and the second energy supplement current reference value is not greater than the sum result.

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

[0161] A current difference between the first energy supplement current reference value and the subject side current is determined, and the partner side current is determined based on the current difference.

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

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

[0164] In one embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program, when executed by a processor, implements the following steps:

[0165] In the case of testing the operation of the energy storage system, a first state of charge of the energy storage system is obtained; and based on the first state of charge and a first preset state of charge, a first energy supplement current reference value is determined.

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

[0167] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:

[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 the first energy supplement current reference value is determined based on the difference.

[0169] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:

[0170] The subject side current of the subject valve device of the energy storage system is determined according to the subject side current of the subject valve device and the first energy supplement current reference value; and the energy storage system is charged based on the subject side current, the first energy supplement current reference value and the rated current of the subject valve device.

[0171] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:

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

[0173] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:

[0174] The sum of the rated current and the subject side current is determined; the first energy supplement current reference value is adjusted to obtain a second energy supplement current reference value based on the sum; and the second energy supplement current reference value is not greater than the sum.

[0175] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:

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

[0177] In one embodiment, the computer program, which is executed by the processor, further implements the following steps:

[0178] In the case of charging the energy storage system based on the first energy supplement current reference value, a second state of charge of the energy storage system is obtained; and if the second state of charge is greater than or equal to a second preset state of charge, the 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 the processor, implements the following steps:

[0180] In a case that the operation of the energy storage system is tested, a first state of charge of the energy storage system is acquired; a first energy supplement current reference value is determined 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 supplement current reference value.

[0182] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[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 the first energy supplement current reference value is determined based on the difference.

[0184] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0185] A test side current of the energy storage system is determined according to the test side current of the test valve device and the first energy supplement current reference value; and the energy storage system is charged based on the test side current, the first energy supplement current reference value and a rated current of the test valve device.

[0186] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0187] If the test side current is greater than the rated current, a second energy supplement current reference value is obtained by adjusting the first energy supplement current reference value; and the energy storage system is charged based on the second energy supplement current reference value.

[0188] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0189] A sum result of the rated current and the test side current is determined; a second energy supplement current reference value is obtained by adjusting the first energy supplement current reference value based on the sum result; and the second energy supplement current reference value is not greater than the sum result.

[0190] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

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

[0192] In one embodiment, the computer program, when executed by the processor, further implements the following steps:

[0193] In a case that the energy storage system is charged based on the first energy supplement current reference value, a second state of charge of the energy storage system is acquired; and if the second state of charge is greater than or equal to a second preset state of charge, the charging of the energy storage system is stopped.

[0194] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties.

[0195] It can be understood by those skilled in the art that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing related hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiments. Any reference to memory, database or other medium used in the embodiments provided by the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided by the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a regional block chain, etc., without being limited thereto. The processor involved in the embodiments provided by the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0196] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present disclosure.

[0197] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of the patent of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An energy storage system, wherein, The energy storage system comprises a control device, a processing device, a compensating power supply and two valve devices, the two valve devices comprising a test valve device and a companion valve device connected with the test valve device; The processing device is connected with each of the valve devices, the control device and the compensating power supply, and each of the valve devices is connected with the control device; Each of the valve devices comprises one energy storage module or at least two energy storage modules connected in series, and the energy storage module comprises a power unit and an energy storage unit connected in parallel with the power unit.

2. The energy storage system of claim 1, wherein, A first end of the processing device is connected with a low-pressure end of the test valve device and a low-pressure end of the companion valve device; A second end of the processing device is connected with a high-pressure end of the test valve device and a high-pressure end of the companion valve device.

3. The energy storage system of claim 1 or 2, wherein, The energy storage system further comprises a reactor; The companion valve device is connected with the test valve device through the reactor, and the second end of the processing device is connected with the reactor.

4. The energy storage system of claim 3, wherein, The reactor comprises a first reactor; The high-pressure end of the companion valve device and the second end of the processing device are connected with a first end of the first reactor, and a second end of the first reactor is connected with the high-pressure end of the test valve device.

5. The energy storage system of claim 4, wherein, The reactor further comprises a second reactor; A first end of the first reactor is connected with a first end of the second reactor, and a second end of the second reactor is connected with the high-pressure end of the companion valve device; The second end of the processing device is connected with the first end of the first reactor and the first end of the second reactor.

6. The energy storage system of any one of claims 1-5, wherein, The compensating power supply comprises an alternating current power grid and a filter circuit, and the processing device is connected with the alternating current power grid through the filter circuit.

7. A method of supplementing an energy storage system, wherein, The compensating method is applied to the processing device in the energy storage system according to any one of claims 1-6; the method comprises: In the case of testing the operation of the energy storage system, a first state of charge of the energy storage system is obtained; According to the first state of charge and a first preset state of charge, a first compensating current reference value is determined; The energy storage system is charged based on the first compensating current reference value.

8. The method of claim 7, wherein, The determination of the first compensating current reference value according to the first state of charge and the first preset state of charge comprises: 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; The first compensating current reference value is determined based on the difference.

9. The method of claim 7 or 8, wherein, The charging of the energy storage system based on the first compensating current reference value comprises: According to a test side current of the test valve device and the first compensating current reference value, a companion side current of the companion valve device of the energy storage system is determined; The energy storage system is charged based on the companion side current, the first compensating current reference value and a rated current of the companion valve device.

10. The method of claim 9, wherein, The charging of the energy storage system based on the companion side current, the first compensating current reference value and the rated current of the companion valve device comprises: If the companion side current is greater than the rated current, the first compensating current reference value is adjusted to obtain a second compensating current reference value; Charging the energy storage system based on the second energy compensation current reference value.

11. The method of claim 10, wherein, The adjusting the first energy compensation current reference value to obtain a second energy compensation current reference value comprises: determining a sum result of the rated current and the subject side current; adjusting the first energy compensation current reference value based on the sum result to obtain the second energy compensation current reference value; the second energy compensation current reference value is not greater than the sum result.

12. The method according to any one of claims 9-11, wherein, The determining the partner side current of the energy storage system according to the subject side current of the subject valve device and the first energy compensation current reference value comprises: determining a current difference value of the first energy compensation current reference value and the subject side current, and determining the partner side current according to the current difference value.

13. The method according to any one of claims 7-12, wherein, The method further comprises: in the case of charging the energy storage system based on the first energy compensation current reference value, obtaining a second state of charge of the energy storage system; if the second state of charge is greater than or equal to a second preset state of charge, stopping charging the energy storage system.

14. A computer device comprising a memory and a processor, the memory storing a computer program, wherein, The processor executes the computer program to realize the steps of the method of any one of claims 7 to 13.

15. A computer readable storage medium having stored thereon a computer program, wherein, The computer program is executed by the processor to realize the steps of the method of any one of claims 7 to 13.

16. A computer program product comprising a computer program, wherein, The computer program is executed by the processor to realize the steps of the method of any one of claims 7 to 13.

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