Energy complementing method, energy storage system, energy complementing device, equipment and storage medium

Abstract

The invention relates to an energy complementing method, an energy storage system, an energy complementing device, equipment and a storage medium. The energy complementing method is applied to the energy storage system, and the method realizes that a controller determines a target electric cabinet to be subjected to energy complementing in an energy storage unit under the condition that the energy storage unit in the energy storage system does not meet a preset electric quantity requirement, and controls an energy complementing device in the energy storage system to complement electric quantity for the target electric cabinet. According to the method, the controller automatically supplements the electric quantity to the target electric cabinet according to the energy supplementation requirement, it is not needed to manually and sequentially connect each electric cabinet needing electric energy supplementation with an energy supplementation device for charging, and especially when the energy storage system comprises a plurality of energy storage sub-modules, the energy supplementation efficiency is improved to a certain degree.

Description

Technical Field

[0001] The present application relates to the field of high-voltage direct-mounted energy storage, and in particular to an energy replenishment method, energy storage system, energy replenishment device, equipment and storage medium. Background Art

[0002] In the flexible direct current transmission project, each energy storage submodule in the high-voltage direct-mounted energy storage system will be assembled into a valve tower for operation test before commissioning. During the operation test, it is necessary to control the output current or voltage of each energy storage submodule in the valve tower to simulate the current and voltage of the high-voltage direct-mounted energy storage system under actual operating conditions for evaluation.

[0003] However, the valve tower will generate power loss during the operation test, so it is necessary to timely recharge the energy storage cabinets with low charge in the valve tower to ensure the normal operation of the test. However, the current method of recharging the energy storage cabinets in the valve tower has the problem of low recharging efficiency. Summary of the invention

[0004] Based on this, it is necessary to provide an energy replenishment method, energy storage system, energy replenishment device, equipment and storage medium that can improve energy replenishment efficiency in response to the above technical problems.

[0005] In a first aspect, the present application provides an energy replenishment method. The method is applied to an energy storage system, and the method comprises:

[0006] When the energy storage unit in the energy storage system does not meet the preset power requirement, determining the target power cabinet to be charged in the charging unit;

[0007] Control the energy replenishment device in the energy storage system to replenish power for the target electric cabinet.

[0008] The energy replenishment method described in the embodiment of the present application is applied to the energy storage system, and the method realizes that when the energy storage unit in the energy storage system does not meet the preset power requirements, the controller determines the target electric cabinet to be replenished in the energy storage unit, and controls the energy replenishment device in the energy storage system to replenish the target electric cabinet. The above method realizes a method in which the controller automatically replenishes the power of the target electric cabinet according to the energy replenishment demand, without manually connecting the energy replenishment device to charge each electric cabinet that needs to be replenished, especially when the energy storage system includes multiple energy storage sub-modules, which improves the energy replenishment efficiency to a certain extent.

[0009] In one embodiment, controlling the energy replenishment device in the energy storage system to replenish power for the target electric cabinet includes:

[0010] Determining the number of target electrical cabinets in the energy storage unit;

[0011] According to the number of the target power cabinets, the energy replenishment device in the energy storage system is controlled to replenish the power of the target power cabinets.

[0012] The energy replenishment method provided in the embodiment of the present application can perform charging with different charging strategies according to the number of electric cabinets to be replenished, which can improve the charging efficiency of the energy storage unit to a certain extent.

[0013] In one embodiment, controlling the energy replenishment device in the energy storage system to replenish the target power cabinet with electricity according to the number of the target power cabinets includes:

[0014] If the energy storage unit includes a target power cabinet, controlling the energy replenishment device to replenish power for the target power cabinet;

[0015] If the energy storage unit includes a plurality of the target power cabinets, the energy replenishment device is controlled to replenish power for the plurality of the target power cabinets according to a preset charging strategy.

[0016] The energy replenishment method provided in the embodiment of the present application is divided into charging with different charging strategies for one electric cabinet to be replenished and multiple electric cabinets to be replenished, which can improve the charging efficiency of the energy storage unit to a certain extent.

[0017] In one embodiment, the charging strategy includes any one of the following:

[0018] Controlling the energy replenishment device to charge each of the target power cabinets to a first preset charge threshold;

[0019] The energy replenishment device is controlled to charge each of the target power cabinets once to a second preset charge threshold, and to charge the power cabinets after the first charge for a second time to the first preset charge threshold; the second preset charge threshold is less than the first preset charge threshold.

[0020] The charging strategy described in the embodiment of the present application can be charged in one time or in two times, which improves the flexibility of charging to a certain extent and can improve the charging efficiency to a certain extent.

[0021] In one of the embodiments, the second preset charge threshold is the maximum charge amount in the plurality of target electrical cabinets.

[0022] The charging strategy described in the embodiment of the present application performs charging in two steps, which improves the charging efficiency to a certain extent.

[0023] In one embodiment, after determining the target cabinet to be replenished in the energy storage unit, the method further includes:

[0024] Determining an energy replenishment device according to the power of the energy storage unit and the power of the energy replenishment device;

[0025] The controlling the energy replenishment device in the energy storage system to replenish the target electric cabinet with electricity includes:

[0026] The energy replenishment device is controlled to replenish power for the target electric cabinet.

[0027] The energy replenishment method described in the embodiment of the present application can be applied to the scenario where the power of the energy storage unit to be replenished is greater than the power of the energy replenishment device, and can also be applied to the scenario where the power of the energy storage unit to be replenished is not greater than the power of the energy replenishment device. It has a wide range of applicability.

[0028] In one embodiment, determining the energy replenishment device according to the power of the energy storage unit and the power of the energy replenishment device includes:

[0029] Determining whether the power of the energy storage unit is greater than the power of the energy replenishment device;

[0030] If the amount of electricity in the energy storage unit is greater than the amount of electricity in the energy replenishment device, the first reactance in the energy storage system and the energy replenishment device are used as the energy replenishment device;

[0031] If the power of the energy storage unit is not greater than the power of the energy charging device, the energy charging device is used as the energy charging device.

[0032] The energy replenishment method described in the embodiment of the present application can assist in energy replenishment of the target power cabinet when the energy replenishment device is insufficient in power by adding additional reactance. The implementation method is simple and can reduce the phenomenon of normal energy replenishment failure due to insufficient power in the energy replenishment device, thereby improving the energy replenishment efficiency.

[0033] In one embodiment, if the power of the energy storage unit is greater than the power of the energy replenishment device, the first reactance in the energy storage system and the energy replenishment device are used as the energy replenishment device, including:

[0034] If the power of the energy storage unit is greater than the power of the energy replenishment device, determine whether the power of the energy storage unit is greater than the sum of the power of the energy replenishment device and the first reactance;

[0035] If the amount of electricity in the energy storage unit is greater than the sum of the electricity, the first reactance in the energy storage system, the energy replenishment device, and the second reactance in the energy storage system are used as the energy replenishment device;

[0036] If the amount of electricity in the energy storage unit is not greater than the amount of electricity in the energy compensation system, the first reactance in the energy storage system and the energy compensation device are used as the energy compensation components.

[0037] The energy replenishment method described in the embodiment of the present application can assist in energy replenishment of the target power cabinet when the energy replenishment device is insufficient in power by adding additional reactance. The implementation method is simple and can reduce the phenomenon of normal energy replenishment failure due to insufficient power in the energy replenishment device, thereby improving the energy replenishment efficiency.

[0038] In a second aspect, the present application provides an energy storage system, the energy storage system comprising: at least one energy storage submodule, an energy replenishment device and a controller; the energy storage submodule comprises a power unit and an energy storage unit connected in parallel, the energy storage unit comprises a plurality of electric cabinet branches connected in parallel, each electric cabinet branch comprises an electric cabinet and a first switch connected in series, the controller is respectively connected to the energy storage submodule and the energy replenishment device; the energy replenishment device is connected in parallel to each of the electric cabinet branches;

[0039] The controller is used to execute the energy replenishment method as described in the first aspect.

[0040] The energy storage system provided in the embodiment of the present application can realize that when the energy storage unit does not meet the preset power requirements, the controller determines the target electric cabinet to be replenished in the energy charging unit, and controls the energy replenishment device in the energy storage system to replenish the target electric cabinet. The energy storage system can also automatically replenish the target electric cabinet according to the energy replenishment demand, without manually connecting the energy replenishment device to charge each electric cabinet that needs to be replenished, especially when the energy storage system includes multiple energy storage sub-modules, which improves the energy replenishment efficiency to a certain extent.

[0041] In one of the embodiments, the electrical cabinet branch further includes a current limiting device; the current limiting device is connected in parallel with the first switch.

[0042] The current limiting device in the embodiment of the present application can play a certain protective role on the capacitors and electrical cabinets in the energy storage system.

[0043] In one embodiment, the current limiting device is a resistor.

[0044] The resistor in the embodiment of the present application can play a certain protective role on the capacitors and electrical cabinets in the energy storage system.

[0045] In one embodiment, the current limiting device also includes a second switch; one end of the second switch is connected to one end of the resistor, and the other end of the resistor is respectively connected to the common end of the first switch and the electrical cabinet; the other end of the second switch is connected to the common end of the first switch and the power unit.

[0046] The second switch in the embodiment of the present application can control the resistance to play a current limiting role.

[0047] In one embodiment, the power unit includes a switch branch and a capacitor connected in parallel, and the switch branch includes a third switch and a fourth switch connected in series.

[0048] The power unit in the embodiment of the present application can achieve efficient charging without affecting the effects of other energy storage submodules by closing the third switch and opening the fourth switch during the energy replenishment process to connect the energy storage submodule and the energy replenishment device to be replenished, and disconnecting other energy storage submodules and energy replenishment devices that do not need energy replenishment.

[0049] In one embodiment, the energy storage system includes N energy storage sub-modules connected in series, the positive output end of the first energy storage sub-module among the N energy storage sub-modules is connected to one end of the energy compensation device, and the negative output end of the Nth energy storage sub-module is connected to the other end of the energy compensation device.

[0050] The energy storage system described in the embodiment of the present application can be applied in a valve tower experiment, that is, it provides an energy replenishment method during a valve tower operation test.

[0051] In one embodiment, the energy storage system further includes a first reactance; the positive output end of the first energy storage submodule is connected to one end of the first reactance, and the other end of the first reactance is connected to one end of the energy compensation device.

[0052] In the energy storage system described in the embodiment of the present application, when a first reactance is added between the energy charging device and the energy storage submodule, the energy charging device can be charged when the voltage of the energy charging power supply is higher than the voltage of the energy storage submodule being charged, and can also be charged when the voltage of the energy charging power supply is lower than the voltage of the energy storage submodule being charged, which has stronger applicability.

[0053] In one embodiment, the energy storage system further includes a second reactance; the negative output end of the Nth energy storage submodule is connected to one end of the second reactance, and the other end of the second reactance is connected to one end of the energy compensation device.

[0054] In the energy storage system described in the embodiment of the present application, when another second inductor is added between the energy charging device and the energy storage sub-module, the energy charging device can be charged when the voltage of the energy charging power supply is higher than the voltage of the energy storage sub-module being charged, and can also be charged when the voltage of the energy charging power supply is lower than the voltage of the energy storage sub-module being charged, which has stronger applicability.

[0055] In a second aspect, the present application provides an energy replenishment device, the energy replenishment device comprising:

[0056] A determination module, used to determine a target electric cabinet to be charged in the charging unit when the energy storage unit in the energy storage system does not meet the preset power requirement;

[0057] The control module is used to control the energy replenishment device in the energy storage system to replenish the target electric cabinet with electricity.

[0058] In a third aspect, the present application further provides a computer device, wherein the computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the energy replenishment method described in the first aspect is implemented.

[0059] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the energy replenishment method described in the first aspect is implemented.

[0060] In a fifth aspect, the present application further provides a computer program product, wherein the computer program product comprises a computer program, and when the computer program is executed by a processor, the energy replenishment method described in the first aspect is implemented.

[0061] 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

[0062] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0063] Figure 1 is a schematic structural diagram of an energy storage system in one embodiment;

[0064] Figure 2 A schematic diagram of a flow chart of an energy replenishment method in one embodiment;

[0065] Figure 3 A schematic flow chart of an energy replenishment method in another embodiment;

[0066] Figure 4 A schematic flow chart of an energy replenishment method in another embodiment;

[0067] Figure 5 A schematic flow chart of an energy replenishment method in another embodiment;

[0068] Figure 6 A schematic flow chart of an energy replenishment method in another embodiment;

[0069] Figure 7 A schematic diagram of the structure of an energy storage system in another embodiment;

[0070] Figure 8 A schematic diagram of the structure of an energy storage system in another embodiment;

[0071] Fig. 9 A schematic diagram of a flow chart of an energy storage submodule in one embodiment;

[0072] Fig.10 A schematic diagram of the structure of an energy storage system in another embodiment;

[0073] Fig.11 A schematic diagram of the structure of an energy storage system in another embodiment;

[0074] Fig.12 A schematic diagram of the structure of an energy storage system in another embodiment;

[0075] Fig.13 A schematic diagram of the structure of an energy storage system in another embodiment;

[0076] Fig.14 A schematic flow chart of an energy replenishment method in another embodiment;

[0077] Fig.15 A schematic flow chart of an energy replenishment method in another embodiment;

[0078] Fig.16 A schematic flow chart of an energy replenishment method in another embodiment;

[0079] Fig.17 A schematic flow chart of an energy replenishment method in another embodiment;

[0080] Fig.18 is a structural block diagram of an energy replenishment device in an embodiment;

[0081] Fig.19 is a structural block diagram of an energy replenishment device in an embodiment;

[0082] Fig. 20 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0084] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0085] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0086] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0087] In the flexible direct current transmission project, the energy storage submodules in the energy storage valve control system will be assembled into a valve tower for operation test before commissioning. Before the operation experiment, it is necessary to manually charge the capacitors inside each energy storage submodule one by one, or connect multiple charging or energy replenishment devices to the valve tower to simulate the current and voltage under the actual operating conditions. However, during the operation test, the energy storage submodule will generate power loss, so it is necessary to replenish the energy storage submodule with a lower battery charge (State of Charge, SOC) value. The position of the high-voltage energy storage submodule is often very high, and the charging line is difficult to connect. In addition, the number of energy storage submodules is large, and the number of electrical cabinets in each energy storage submodule is large. Relying on manually charging each electrical cabinet to connect the energy replenishment device is too low in efficiency and high in cost. In response to the above problems, the embodiments of the present application provide an energy replenishment method, an energy storage system, an energy replenishment device, an equipment and a storage medium. The following embodiments will specifically illustrate the energy replenishment method and energy storage system described in the embodiments of the present application.

[0088] The energy replenishment method provided in the embodiment of the present application can be applied to Figure 1The energy storage system shown. The energy storage system can be a flexible direct high-voltage direct-mounted energy storage system. The energy storage system includes a plurality of energy storage submodules 10, an energy replenishment device 20 and a controller 30; wherein, the plurality of energy storage submodules 10 are connected in series, each energy storage submodule 10 includes a power unit 101 and an energy storage unit 102, the energy storage unit 102 includes a plurality of electrical cabinets 1021, the energy replenishment device 20 is connected to the energy storage unit 102, and the controller 30 is respectively connected to the energy replenishment device 20 and the energy storage submodule 10, specifically, the controller 30 is respectively connected to the power unit 101 and the energy storage unit 102 in the energy storage submodule 10. Optionally, the above-mentioned energy replenishment device 20 may include a plurality of energy replenishment units, and each energy replenishment unit may be connected to a corresponding energy storage unit 102. wherein the controller 30 may be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, and servers.

[0089] Those skilled in the art will understand that Figure 1 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present application, and does not constitute a limitation on the energy storage system to which the scheme of the present application is applied. The specific energy storage system may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0090] In one embodiment, Figure 2 As shown, a method for replenishing energy is provided, which is applied to Figure 1 Taking the controller in the energy storage system as an example, the following steps are included:

[0091] S201, when the energy storage unit in the energy storage system does not meet the preset power requirement, determine the target power cabinet to be charged in the charging unit.

[0092] Among them, the preset power requirement is used to measure whether the energy storage sub-module is short of power, or to measure whether the energy storage unit in the energy storage sub-module is short of power, or to measure whether the electric cabinet in the energy storage unit is short of power, which may include determining whether the energy storage sub-module reaches a preset power threshold, or including determining whether the power of the energy storage unit reaches a preset power threshold, or including determining whether the power of the electric cabinet in the energy storage unit reaches a preset power threshold.

[0093] In an embodiment of the present application, the controller may first control the energy storage unit to charge the power unit so that the charges at both ends of the power unit and the energy storage unit reach a balanced state, thereby facilitating the normal operation of the energy storage submodule. It is understandable that when the energy storage system includes multiple energy storage submodules, the controller may control the energy storage unit in each energy storage submodule to charge the corresponding power unit. After the power unit is fully charged, the controller may monitor in real time whether the energy storage unit in the energy storage submodule meets the preset power requirements. If so, it means that the energy storage unit is not short of power and does not need to be replenished. If not, it means that the energy storage unit is short of power and needs to be replenished. At this time, the controller may first determine the target electrical cabinets in the energy storage unit that need to be replenished. Specifically, it may determine whether the electrical cabinets in the energy storage unit meet the preset power requirements, and determine all electrical cabinets that do not meet the preset power requirements as target electrical cabinets.

[0094] S202, controlling the energy replenishment device in the energy storage system to replenish power for the target electric cabinet.

[0095] In the embodiment of the present application, after the controller determines the target power cabinet to be recharged, the recharging device can be started to connect the path between the recharging device and the target power cabinet to drive the recharging device to recharge the target power cabinet. Optionally, when the recharging device includes multiple recharging units, the controller can start the recharging unit connected to the target power cabinet to control the path connecting the recharging unit and the target power cabinet, and at the same time can cut off the paths between other recharging units and other power cabinets to drive the matching recharging unit to recharge the target power cabinet.

[0096] The energy replenishment method described in the embodiment of the present application is applied to the energy storage system, and the method realizes that when the energy storage unit in the energy storage system does not meet the preset power requirements, the controller determines the target electric cabinet to be replenished in the energy storage unit, and controls the energy replenishment device in the energy storage system to replenish the target electric cabinet. The above method realizes a method in which the controller automatically replenishes the power of the target electric cabinet according to the energy replenishment demand, without manually connecting the energy replenishment device to charge each electric cabinet that needs to be replenished, especially when the energy storage system includes multiple energy storage sub-modules, which improves the energy replenishment efficiency to a certain extent.

[0097] In one embodiment, when the controller specifically performs the above step S202, Figure 3 As shown, the specific execution steps are:

[0098] S301, determining the number of target electrical cabinets in the energy storage unit.

[0099] The energy storage unit in the energy storage submodule includes multiple electric cabinets, and the multiple electric cabinets are connected in parallel. When the energy storage submodule is running, the charge states of different electric cabinets in the energy storage unit are different, so the power shortage states of different electric cabinets are also different.

[0100] In the embodiment of the present application, when the controller controls the energy replenishment device to replenish the energy storage unit, it is necessary to first determine the number of electric cabinets to be replenished in the energy storage unit, that is, the number of target electric cabinets.

[0101] S302: Control the energy replenishment device in the energy storage system to replenish power for the target power cabinets according to the number of the target power cabinets.

[0102] Among them, different numbers of target power cabinets can correspond to different charging strategies.

[0103] In the embodiment of the present application, the controller can select a corresponding charging strategy to charge the target cabinet according to the number of target cabinets. For example, if the energy storage unit includes one target cabinet, the first charging strategy is selected to charge the target cabinet; if the energy storage unit includes two target cabinets, the second charging strategy is selected to charge the target cabinet; if the energy storage unit includes three or more target cabinets, the third charging strategy is selected to charge the target cabinet. The above method is only an example, and the corresponding relationship between the number of different target cabinets and the charging strategy is not limited.

[0104] The energy replenishment method provided in the embodiment of the present application can perform charging with different charging strategies according to the number of electric cabinets to be replenished, which can improve the charging efficiency of the energy storage unit to a certain extent.

[0105] Optionally, when the controller executes the above step S302, specifically when the energy storage unit includes one target cabinet, the controller controls the energy replenishment device to replenish the target cabinet. When the energy storage unit includes multiple target cabinets, the controller controls the energy replenishment device to replenish the multiple target cabinets according to a preset charging strategy.

[0106] An embodiment of the present application relates to a scenario in which there is only one electric cabinet to be energized. In this scenario, the controller can directly control the energy charging device to replenish power for the target electric cabinet. Specifically, the controller can start the energy charging device connected to the target electric cabinet or the energy charging unit in the energy charging device to charge the target electric cabinet.

[0107] The embodiments of the present application also involve a scenario in which there are multiple electric cabinets to be energized. In this scenario, the controller can select charging strategies corresponding to multiple target electric cabinets to charge the multiple target electric cabinets; optionally, the controller can simultaneously start the energy charging devices connected to each target electric cabinet or the energy charging units in the energy charging devices to charge the multiple target electric cabinets; optionally, the controller can sequentially start the energy charging devices connected to each target electric cabinet or the energy charging units in the energy charging devices to charge the multiple target electric cabinets.

[0108] The energy replenishment method provided in the embodiment of the present application is divided into charging with different charging strategies for one electric cabinet to be replenished and multiple electric cabinets to be replenished, which can improve the charging efficiency of the energy storage unit to a certain extent.

[0109] Optionally, the charging strategy may include any one of the following:

[0110] The first charging strategy is to control the energy replenishment device to charge each target power cabinet to a first preset charge threshold value.

[0111] Among them, the first preset charge threshold is a charge value that meets the preset power requirement. For example, the first preset charge threshold can be any value among 50% SOC, 60% SOC, 70% SOC, 80% SOC, 90% SOC, 100% SOC, etc.

[0112] In an embodiment of the present application, when the controller needs to charge multiple target power cabinets, the first preset charge threshold can be used as the charging target, and the energy replenishment device can be controlled simultaneously or sequentially to charge each target power cabinet to the first preset charge threshold, so that the storage unit can reach the preset power requirement.

[0113] The second charging strategy is to control the energy replenishment device to charge each target power cabinet once to a second preset charge threshold, and to charge the power cabinet after the first charge for a second time to the first preset charge threshold; the second preset charge threshold is less than the first preset charge threshold.

[0114] The second preset charge threshold may be any value of 50% SOC, 60% SOC, 70% SOC, 80% SOC, 90% SOC, 100% SOC, etc. Optionally, the second preset charge threshold may be the maximum charge amount among multiple target power cabinets. For example, there are three target power cabinets to be replenished, and the first target power cabinet has a SOC of 10%, the second target power cabinet has a SOC of 20%, and the third target power cabinet has a SOC of 30%. If the first preset charge threshold is 50% SOC, the corresponding second preset charge threshold may be 30% SOC.

[0115] In an embodiment of the present application, when the controller needs to charge multiple target power cabinets, the charging can be performed in two times. The first time, the multiple target power cabinets are charged simultaneously or sequentially to a first preset charge threshold. After the first charging, the multiple target power cabinets are charged a second time. The second time, the multiple target power cabinets are charged simultaneously or sequentially to a second preset charge threshold, so that the storage unit can reach the preset power requirement.

[0116] The charging strategy described in the embodiment of the present application can be charged in one time or in two times, which improves the flexibility of charging to a certain extent and can improve the charging efficiency to a certain extent.

[0117] In one embodiment, the power of the storage unit to be charged may be less than the power of the charging device, or may be greater than the power of the charging device. Based on this, a charging method is provided, such as Figure 4 As shown, the method includes:

[0118] S203, determining the energy charging device according to the power of the energy storage unit and the power of the energy charging device.

[0119] Correspondingly, when the controller specifically executes the above S202 "controlling the energy replenishment device in the energy storage system to replenish power for the target electric cabinet", the specific execution steps are: controlling the energy replenishment device to replenish power for the target electric cabinet.

[0120] The energy replenishment device may be an energy replenishment device or a reactor connected to cascaded storage submodules in the valve tower system.

[0121] In the embodiment of the present application, after the target electric cabinet to be replenished in the energy storage unit is determined, the power of the energy storage unit where the target electric cabinet is located may be greater than the power of the currently used energy replenishment device, or may not be greater than the power of the currently used energy replenishment device, so it is necessary to select a suitable energy replenishment device to replenish the target electric cabinet according to the power of the energy storage unit and the power of the energy replenishment device. For example, when the power of the energy storage unit is greater than the power of the currently used energy replenishment device, it means that the power of the currently used energy replenishment device is not enough to replenish the target electric cabinet, so it is necessary to add an additional energy replenishment device to replenish the target electric cabinet; when the power of the energy storage unit is not greater than the power of the currently used energy replenishment device, it means that the power of the currently used energy replenishment device can replenish the target electric cabinet.

[0122] The energy replenishment method described in the embodiment of the present application can be applied to the scenario where the power of the energy storage unit to be replenished is greater than the power of the energy replenishment device, and can also be applied to the scenario where the power of the energy storage unit to be replenished is not greater than the power of the energy replenishment device. It has a wide range of applicability.

[0123] In one embodiment, a method for implementing the above-mentioned determination of the energy replenishment device is provided, that is, Figure 5 As shown, the method includes:

[0124] S401, determine whether the power of the energy storage unit is greater than the power of the energy charging device. If the power of the energy storage unit is greater than the power of the energy charging device, execute step S402; if the power of the energy storage unit is not greater than the power of the energy charging device, execute step S403.

[0125] S402, using the first reactance and the energy replenishment device in the energy storage system as energy replenishment devices.

[0126] S403, using the energy charging device as an energy charging component.

[0127] In an embodiment of the present application, after the controller determines the target electric cabinet to be replenished in the energy storage unit, it can further obtain the power of the energy storage unit where the target electric cabinet is located, and the power of the energy replenishment device connected to the energy storage unit, and compare the power of the two to determine whether the power of the energy storage unit is greater than the power of the energy replenishment device. If it is greater, it means that the power of the energy replenishment device is insufficient to replenish the electric energy. In this scenario, the energy replenishment device can be controlled to connect to the first inductor in the energy storage system to add an additional energy replenishment device to replenish the target electric cabinet in the energy storage unit, that is, the first inductor and the energy replenishment device are used together as energy replenishment devices to replenish the target electric cabinet; if it is less than, it means that the power of the energy replenishment device can replenish the target electric cabinet. In this scenario, the energy replenishment device is directly used as an energy replenishment device to replenish the target electric cabinet.

[0128] The energy replenishment method described in the embodiment of the present application can assist in energy replenishment of the target power cabinet when the energy replenishment device is insufficient in power by adding additional reactance. The implementation method is simple and can reduce the phenomenon of normal energy replenishment failure due to insufficient power in the energy replenishment device, thereby improving the energy replenishment efficiency.

[0129] In one embodiment, when the power of the energy storage unit is greater than the power of the energy charging device, and the first inductor and the energy charging device in the energy storage system are used as energy charging devices to charge the target cabinet, a scenario where the power of the energy charging device is insufficient may occur. Therefore, if Figure 6 As shown, the above method also includes:

[0130] S4021, determine whether the power of the energy storage unit is greater than the sum of the power of the energy compensation device and the first reactance; if the power of the energy storage unit is greater than the sum, execute step S4022; if the power of the energy storage unit is not greater than the sum, execute step S4023.

[0131] S4022, using the first reactance in the energy storage system, the energy compensation device, and the second reactance in the energy storage system as energy compensation devices.

[0132] S4023, using the first reactance and the energy replenishment device in the energy storage system as energy replenishment devices.

[0133] In an embodiment of the present application, after the controller determines that the power of the energy storage unit is greater than that of the energy charging device, it can further obtain the power of the energy storage unit where the target cabinet is located, the power of the energy charging device connected to the energy storage unit, and the power of the first reactance connected to the energy storage unit, and compare the power of the three to determine whether the power of the energy storage unit is greater than the sum of the power of the energy charging device and the first reactance. If greater than, it means that the energy charging device and the first reactance are insufficient to supplement the electric energy. In this scenario, the energy charging device can be controlled to connect to the second reactance in the energy storage system to add an additional energy charging device to charge the target cabinet in the energy storage unit, that is, the first reactance, the second reactance and the energy charging device are used together as energy charging devices to charge the target cabinet; if less than, it means that the power of the first reactance and the energy charging device can charge the target cabinet. In this scenario, the first reactance and the energy charging device are directly used as energy charging devices to charge the target cabinet.

[0134] The energy replenishment method described in the embodiment of the present application can assist in energy replenishment of the target power cabinet when the energy replenishment device is insufficient in power by adding additional reactance. The implementation method is simple and can reduce the phenomenon of normal energy replenishment failure due to insufficient power in the energy replenishment device, thereby improving the energy replenishment efficiency.

[0135] In one embodiment, based on the above energy replenishment method, an energy storage system to which the energy replenishment method is applied is provided, such as Figure 7 As shown, the energy storage system includes: at least one energy storage submodule 50 ( Figure 7 , a circuit structure diagram of multiple energy storage submodules is shown in the figure), an energy replenishment device 40 and a controller 60; the energy storage submodule 50 includes a power unit 501 and an energy storage unit 502 connected in parallel, the energy storage unit 502 includes a plurality of electric cabinet branches 5021 connected in parallel, each electric cabinet branch 5021 includes an electric cabinet 5021_1 and a first switch 5021_2 connected in series, and the controller 60 is connected to the energy storage submodule 50 and the energy replenishment device 40 respectively; the energy replenishment device 40 is connected in parallel with each electric cabinet branch 5021; wherein the controller 60 is used to execute the energy replenishment method described in any of the above embodiments, that is, when the energy storage unit 502 in the energy storage system does not meet the preset power requirement, determine the target electric cabinet to be replenished in the energy storage unit 502; and control the energy replenishment device 40 in the energy storage system to replenish power for the target electric cabinet.

[0136] If the energy storage system includes multiple energy storage submodules 50, the corresponding energy replenishment device 40 may be one or may include multiple energy replenishment units, and the multiple energy replenishment units are connected one-to-one with the multiple energy storage submodules 50. The energy storage submodule 50 may be a half-bridge circuit or a full-bridge circuit.

[0137] In the embodiment of the present application, during the energy replenishment process, the controller 60 can first control the energy storage unit 502 in each energy storage sub-module 50 in the energy storage system to charge the power unit 501. Specifically, each first switch 5021_2 can be controlled to be closed, so that the electric cabinet 5021_1 connected to each first switch 5021_2 can charge the power unit 501, thereby balancing the charge of the power unit 501 and the electric cabinet 5021_1. After the charging of the power unit 501 is completed, the first switch 5021_2 can be disconnected; thereafter, during the operation of the energy storage submodule 50, the charge of the energy storage unit 502 in each energy storage submodule 50 can be monitored in real time to determine whether the energy storage unit 502 meets the preset power requirement, that is, to determine whether the target electric cabinet in the energy storage unit 502 meets the preset power requirement. If not, the first switch 5021_2 corresponding to the target electric cabinet that does not meet the preset power requirement is controlled to be closed, so that the energy replenishment device 40 replenishes power for the target electric cabinet that does not meet the preset power requirement, and at the same time, the first switch 5021_2 corresponding to other electric cabinets 5021_1 that meet the preset power requirement is disconnected; if the energy storage system includes multiple energy storage submodules 50, the energy replenishment device 40 and the energy storage submodule 50 that needs energy replenishment are connected accordingly, and the path between the energy replenishment device 40 and the energy storage submodule 50 that does not need energy replenishment is disconnected, so that the energy replenishment device 50 is only loaded on the energy storage submodule 50 that needs energy replenishment to perform the energy replenishment operation. If the energy charging device 40 includes multiple energy charging units, and the energy charging units correspond to the energy storage submodules 50 one by one, when charging the energy storage submodule 50 that needs energy charging, the energy charging unit corresponding to the energy storage submodule 50 that needs energy charging can be started for charging.

[0138] Optional, such as Figure 7 The power unit 501 in the embodiment includes a switch branch 5011 and a capacitor 5012 connected in parallel, and the switch branch 5011 includes a third switch 5011_1 and a fourth switch 5011_2 connected in series; optionally, as Figure 8 As shown, the switch branch 5011 may further include a fifth switch 5011_3, and the fifth switch 5011_3 is connected in parallel to both ends of the fourth switch 5011_2.

[0139] based on Figure 7 When charging the energy storage submodule 50 that needs energy replenishment, the controller 60 can specifically control the third switch 5011_1 in the energy storage submodule 50 that needs energy replenishment to be closed and the fourth switch 5011_2 to be opened, so that the energy storage submodule 50 that needs energy replenishment can be connected to the energy replenishment device 40; and simultaneously control the third switch 5011_1 in the energy storage submodule 50 that does not need energy replenishment to be opened and the fourth switch 5011_2 to be closed, so that the energy storage submodule 50 that does not need energy replenishment is disconnected from the energy replenishment device 40.

[0140] The power unit in the embodiment of the present application can achieve efficient charging without affecting the effects of other energy storage submodules by closing the third switch and opening the fourth switch during the energy replenishment process to connect the energy storage submodule and the energy replenishment device to be replenished, and disconnecting other energy storage submodules and energy replenishment devices that do not need energy replenishment.

[0141] based on Figure 8 In the circuit, the fifth switch 5011_3 connected in parallel at both ends of the fourth switch 5011_2 can be closed when the fourth switch 5011_2 is repaired, and is in a disconnected state when the fourth switch 5011_2 is normally operated and put into use.

[0142] Optional, such as Fig. 9 As shown ( Fig. 9 Only one energy storage submodule 50 is shown. The above-mentioned electric cabinet branch 5021 also includes a current limiting device 5021_3, which is used to limit the current when the electric cabinet 5021_1 charges the capacitor 5012, thereby protecting the capacitor 5012 and the electric cabinet 5021_1. Optionally, the current limiting device 5021_3 can be a resistor; Optionally, the current limiting device 5021_3 can also include a second switch 5021_4 ( Fig. 9 , a circuit including a second switch 5021_4 is shown in FIG. 1 , and one end of the second switch 5021_4 is connected to one end of a resistor, and the other end of the resistor is respectively connected to the common end of the first switch 5021_2 and the electric cabinet 5021_1; the other end of the second switch 5021_4 is connected to the common end of the first switch 5021_2 and the power unit 501. When the controller 60 controls the electric cabinet 5021_1 to charge the capacitor 5012, the controller 60 can control 5021_4 to close, so as to protect the electric cabinet 5021_1 and the capacitor 5012. When the controller 60 replenishes the electric cabinet 5021_1 with electricity, the controller 60 controls the first switch 5021_2 to close, and can control the second switch 5021_4 to close or open.

[0143] Optional, such as Figure 7 As shown in FIG. 8 , the energy storage system provided by the present application includes N energy storage submodules 50 connected in series, the positive output end of the first energy storage submodule 50 among the N energy storage submodules 50 is connected to one end of the energy replenishment device 40, and the negative output end of the Nth energy storage submodule 50 is connected to the other end of the energy replenishment device 40. The energy storage system described in the embodiment of the present application can be applied in a valve tower experiment, that is, a method for replenishing energy during a valve tower operation test is provided.

[0144] based on Figure 7In the energy storage system shown in or 8, when there is an energy storage submodule 50 that needs to be supplemented with electric energy, the energy replenishment device 40 is connected between the high-voltage output end and the low-voltage output end of multiple series-connected energy storage submodules 50. When replenishment is in progress, the third switch 5011_1 of the upper bridge arm of the energy storage submodule 50 to be supplemented is turned on, and the fourth switch 5011_2 of the lower bridge arm is turned off, so as to connect the energy storage submodule 50 to be supplemented and the energy replenishment device 40 for charging; and for the energy storage submodule 50 that is not supplemented, the third switch 5011_1 of the upper bridge arm is turned off, and the fourth switch 5011_2 of the lower bridge arm is turned on, so as to disconnect the energy storage submodule 50 to be supplemented and the energy replenishment device 40.

[0145] Optional, such as Fig.10 As shown, the energy storage system may further include a first reactor 70 ; the positive output end of the first energy storage submodule 50 is connected to one end of the first reactor 70 , and the other end of the first reactor 70 is connected to one end of the energy compensation device 40 .

[0146] Fig.10 When the energy storage system shown adds a first reactance 70 between the energy charging device 40 and the energy storage submodule 50, the energy charging device 40 can be charged when the voltage of the energy charging power supply is higher than the voltage of the energy storage submodule 50 being charged, or when the voltage of the energy charging power supply is lower than the voltage of the energy storage submodule 50 being charged, which makes it more applicable.

[0147] Optional, such as Fig.11 As shown, the energy storage system may further include a second reactor 80 ; the negative output end of the Nth energy storage submodule 50 is connected to one end of the second reactor 80 , and the other end of the second reactor 80 is connected to one end of the energy compensation device 40 .

[0148] Figure 8 When another second inductor 80 is added between the energy charging device 40 and the energy storage submodule 50, the energy charging device 40 can be charged when the voltage of the energy charging power supply is higher than the voltage of the energy storage submodule 50 being charged, or when the voltage of the energy charging power supply is lower than the voltage of the energy storage submodule 50 being charged, which makes it more applicable.

[0149] Fig.10 or Fig.11 The energy storage system shown can also be applied to the valve tower push experiment, that is, applied to two valve towers, such as Fig.12 As shown, the energy storage system includes a first valve tower 1 and a second valve tower 2, wherein the first valve tower 1 includes a plurality of energy storage submodules 50 connected in series, and the second valve tower 2 includes a plurality of energy storage submodules 50 connected in series ( Fig.12 The markings of other components in the embodiment are consistent with those in any of the foregoing embodiments. For details, please refer to the foregoing markings. Fig.12 No more detailed marking).

[0150] Among them, the first valve tower 1 is the test valve tower, and the second valve tower 2 is the accompanying test valve tower. The high-voltage output ends of the first valve tower 1 and the second valve tower 2 can be connected through the first reactance 70, and the corresponding low-voltage output ends are directly connected; optionally, the high-voltage output ends of the first valve tower 1 and the second valve tower 2 can be connected through the first reactance 70, and the corresponding low-voltage output ends are directly connected, or they can be connected at the low-voltage output end through the second reactance ( Fig.12 This structure is not shown in the figure). The valve tower push is mainly for two valve towers to push each other in direct current to simulate the current and voltage of the valve tower under real working conditions. During the operation test of the valve tower, power loss will occur, so it is necessary to supplement the energy storage submodule with a lower SOC value.

[0151] Fig.12 The first reactor 70 in the embodiment is arranged between the first valve tower 1 and the energy replenishment device 40, so that the energy replenishment device 40 can replenish the energy storage submodule 50 in the first valve tower 1 that needs energy replenishment when the voltage is higher than any energy storage submodule 50 to be replenished; it can also replenish the energy storage submodule 50 in the first valve tower 1 when the voltage is lower than any energy storage submodule 50 to be replenished. In this structural diagram, the energy replenishment device 40 can also replenish the energy storage submodule 50 in the second valve tower 2 that needs energy replenishment when the voltage is higher than any energy storage submodule 50 to be replenished.

[0152] Optional, Fig.13 Another half-bridge structure diagram of valve tower push is provided, wherein the first inductor 70 is arranged between the second valve tower 2 and the energy replenishment device 40, so that the energy replenishment device 40 can replenish the energy storage submodule 50 in the second valve tower 2 that needs energy replenishment when the voltage is higher than any energy storage submodule 50 to be replenished; and can also replenish the energy storage submodule 50 in the second valve tower 21 when the voltage is lower than any energy storage submodule 50 to be replenished. In this structure diagram, the energy replenishment device 40 can also replenish the energy storage submodule 50 in the first valve tower 1 that needs energy replenishment when the voltage is higher than any energy storage submodule 50 to be replenished.

[0153] Based on the above Fig.12 or Fig.13 The energy storage system shown in the figure replenishes the energy storage submodule 50 to be replenished in the first valve tower 1. This process is for the case where the voltage of the energy replenishment device is greater than or equal to the energy storage submodule to be replenished, such as Fig.14 As shown, the method includes:

[0154] S1401, controlling the energy storage units in each energy storage submodule in the first valve tower and the second valve tower to charge the capacitor in the power unit.

[0155] S1402, determining the energy storage submodule to be replenished in the first valve tower.

[0156] S1403: Determine the target electrical cabinet to be replenished in the energy storage submodule.

[0157] S1404, controlling the closing of the first switch connected to the target electric cabinet, and opening the first switches connected to other electric cabinets that do not need energy replenishment.

[0158] S1405, controlling all energy storage submodules in the second valve tower to exit, specifically, disconnecting the third switch of the upper bridge arm and the fourth switch of the lower bridge arm of all energy storage submodules in the second valve tower to exit the second valve tower.

[0159] S1406, cutting out the energy storage submodules in the first valve tower except the energy storage submodule to be replenished, specifically, disconnecting the third switch of the upper bridge arm of other energy storage submodules that do not need to be replenished, and turning on the fourth switch of the lower bridge arm.

[0160] S1407, controlling the energy storage submodule to be replenished in the first valve tower to be put into operation, specifically, turning on the third switch of the upper bridge arm of the energy storage submodule to be replenished, and turning off the fourth switch of the lower bridge arm of the energy storage submodule to be replenished.

[0161] S1408, starting the energy charging device to start charging the energy storage submodule to be charged.

[0162] S1409, determine whether each electric cabinet in the energy storage submodule to be supplemented meets the preset power requirement. If yes, execute step S1410; if not, execute step S1403.

[0163] S1410, continue to determine whether each energy storage submodule in the first valve tower meets the preset power requirement, if yes, execute step S1411; if not, execute step S402.

[0164] S1411, the first valve tower energy replenishment is completed.

[0165] Based on the above Fig.12 The energy storage system shown in the figure replenishes the energy storage submodule 50 to be replenished in the first valve tower 1. This process is aimed at the case where the voltage of the energy replenishment device is lower than the energy storage submodule to be replenished, such as Fig.15 As shown, the method includes:

[0166] S1501, controlling the energy storage units in each energy storage submodule in the first valve tower and the second valve tower to charge the capacitor in the power unit.

[0167] S1502, determining the energy storage submodule to be replenished in the first valve tower.

[0168] S1503: Determine the target electrical cabinet to be replenished in the energy storage submodule.

[0169] S1504, controlling the closing of the first switch connected to the target electric cabinet, and opening the first switches connected to other electric cabinets that do not need energy replenishment.

[0170] S1505, controlling all energy storage submodules in the second valve tower to exit, specifically, disconnecting the third switch of the upper bridge arm and the fourth switch of the lower bridge arm of all energy storage submodules in the second valve tower to exit the second valve tower.

[0171] S1506, cutting out the energy storage submodules in the first valve tower except the energy storage submodule to be replenished, specifically, disconnecting the third switch of the upper bridge arm of other energy storage submodules that do not need to be replenished, and turning on the fourth switch of the lower bridge arm.

[0172] S1507, start the energy replenishment device, and the first reactor stores energy.

[0173] S1508, controlling the energy storage submodule to be replenished in the first valve tower to be put into operation, specifically, turning on the third switch of the upper bridge arm of the energy storage submodule to be replenished, and turning off the fourth switch of the lower bridge arm of the energy storage submodule to be replenished.

[0174] S1509, start charging the energy storage submodule to be charged.

[0175] S1510, determining whether each electric cabinet in the energy storage submodule to be supplemented meets the preset power requirement, if so, executing step S1511; if not, executing step S1503.

[0176] S1511, continue to determine whether each energy storage submodule in the first valve tower meets the preset power requirement. If yes, execute step S1512; if not, execute step S1502.

[0177] S1512, the first valve tower energy replenishment is completed.

[0178] Based on the above Fig.12 or Fig.13 The energy storage system shown in the figure replenishes the energy storage submodule 50 to be replenished in the second valve tower 2. This process is for the case where the voltage of the energy replenishment device is greater than or equal to the energy storage submodule to be replenished, such as Fig.16 As shown, the method includes:

[0179] S1601, controlling the energy storage units in each energy storage submodule in the first valve tower and the second valve tower to charge the capacitor in the power unit.

[0180] S1602, determining the energy storage submodule to be replenished in the second valve tower.

[0181] S1603: Determine the target electrical cabinet to be replenished in the energy storage submodule.

[0182] S1604, controlling the closing of the first switch connected to the target electric cabinet, and opening of the first switches connected to other electric cabinets that do not need energy replenishment.

[0183] S1605, controlling all energy storage submodules in the first valve tower to exit, specifically, disconnecting the third switch of the upper bridge arm and the fourth switch of the lower bridge arm of all energy storage submodules in the first valve tower to exit the first valve tower.

[0184] S1606, cutting out the energy storage submodules in the second valve tower except the energy storage submodule to be replenished, specifically, disconnecting the third switch of the upper bridge arm of other energy storage submodules that do not need to be replenished, and turning on the fourth switch of the lower bridge arm.

[0185] S1607, controlling the energy storage submodule to be replenished in the second valve tower to be put into operation, specifically, turning on the third switch of the upper bridge arm of the energy storage submodule to be replenished, and turning off the fourth switch of the lower bridge arm of the energy storage submodule to be replenished.

[0186] S1608, starting the energy charging device to start charging the energy storage submodule to be charged.

[0187] S1609, determine whether each power cabinet in the energy storage submodule to be replenished meets the preset power requirement. If yes, execute step S1610; if not, execute step S1603.

[0188] S1610, continue to determine whether each energy storage submodule in the second valve tower meets the preset power requirement. If yes, execute step S1611; if not, execute step S1602.

[0189] S1611, the second valve tower energy replenishment is completed.

[0190] Based on the above Fig.13 The energy storage system shown in the figure replenishes the energy storage submodule 50 to be replenished in the second valve tower 2. This process is aimed at the case where the voltage of the energy replenishment device is lower than the energy storage submodule to be replenished, such as Fig.17 As shown, the method includes:

[0191] S1701, controlling the energy storage units in each energy storage submodule in the first valve tower and the second valve tower to charge the capacitor in the power unit.

[0192] S1702, determining the energy storage submodule to be replenished in the second valve tower.

[0193] S1703: Determine the target electrical cabinet to be replenished in the energy storage submodule.

[0194] S1704, controlling the closing of the first switch connected to the target electric cabinet, and opening the first switches connected to other electric cabinets that do not need energy replenishment.

[0195] S1705, controlling all energy storage submodules in the first valve tower to exit, specifically, disconnecting the third switch of the upper bridge arm and the fourth switch of the lower bridge arm of all energy storage submodules in the first valve tower to exit the first valve tower.

[0196] S1706, cutting out the energy storage submodules in the second valve tower except the energy storage submodule to be replenished, specifically, disconnecting the third switch of the upper bridge arm of other energy storage submodules that do not need to be replenished, and turning on the fourth switch of the lower bridge arm.

[0197] S1707, start the energy replenishment device, and the first reactor stores energy.

[0198] S1708, controlling the energy storage submodule to be replenished in the second valve tower to be put into operation, specifically, turning on the third switch of the upper bridge arm of the energy storage submodule to be replenished, and turning off the fourth switch of the lower bridge arm of the energy storage submodule to be replenished.

[0199] S1709, start charging the energy storage submodule to be charged.

[0200] S1710, determining whether each electric cabinet in the energy storage submodule to be supplemented meets the preset power requirement, if so, executing step S1711; if not, executing step S1703.

[0201] S1711, continue to determine whether each energy storage submodule in the second valve tower meets the preset power requirement. If yes, execute step S1712; if not, execute step S1702.

[0202] S1712, the second valve tower energy replenishment is completed.

[0203] The energy storage system provided in the embodiment of the present application can realize that when the energy storage unit does not meet the preset power requirements, the controller determines the target electric cabinet to be replenished in the energy charging unit, and controls the energy replenishment device in the energy storage system to replenish the target electric cabinet. The energy storage system can also automatically replenish the target electric cabinet according to the energy replenishment demand, without manually connecting the energy replenishment device to charge each electric cabinet that needs to be replenished, especially when the energy storage system includes multiple energy storage sub-modules, which improves the energy replenishment efficiency to a certain extent.

[0204] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0205] Based on the same inventive concept, the embodiment of the present application also provides an energy replenishment device for implementing the energy replenishment method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more energy replenishment device embodiments provided below can refer to the limitations of the energy replenishment method above, and will not be repeated here.

[0206] In one embodiment, Fig.18 As shown, an energy replenishment device is provided, comprising:

[0207] The determination module 100 is used to determine a target electric cabinet to be replenished in the energy storage unit when the energy storage unit in the energy storage system does not meet the preset power requirement.

[0208] The control module 200 is used to control the energy replenishment device in the energy storage system to replenish the target electric cabinet with electricity.

[0209] In one embodiment, Fig.19 As shown, the control module 200 includes:

[0210] A determination unit 2001 is used to determine the number of target electric cabinets in the energy storage unit;

[0211] The energy replenishment unit 2002 is used to control the energy replenishment device in the energy storage system to replenish the power of the target power cabinets according to the number of the target power cabinets.

[0212] In one embodiment, the above-mentioned energy replenishment unit 2002 is specifically used to control the energy replenishment device to replenish power for the target power cabinet when the energy storage unit includes one target power cabinet; when the energy storage unit includes multiple target power cabinets, control the energy replenishment device to replenish power for multiple target power cabinets according to a preset charging strategy.

[0213] In one embodiment, the charging strategy includes any one of the following:

[0214] Controlling the energy replenishment device to charge each of the target power cabinets to a first preset charge threshold;

[0215] The energy replenishment device is controlled to charge each of the target power cabinets once to a second preset charge threshold, and to charge the power cabinets after the first charge for a second time to the first preset charge threshold; the second preset charge threshold is less than the first preset charge threshold.

[0216] In one embodiment, the second preset charge threshold is a maximum charge amount among the plurality of target electrical cabinets.

[0217] Each module in the above energy replenishment device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0218] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Fig. 20 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, 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 the charge data of the electric cabinet. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method of replenishing energy is implemented.

[0219] Those skilled in the art will understand that Fig. 20 The structure shown in the figure is only a block diagram of a part 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 those shown in the figure, or combine certain components, or have a different arrangement of components.

[0220] 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:

[0221] When the energy storage unit in the energy storage system does not meet the preset power requirement, determining the target power cabinet to be replenished in the energy storage unit;

[0222] Control the energy replenishment device in the energy storage system to replenish power for the target electric cabinet.

[0223] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0224] Determining the number of target electrical cabinets in the energy storage unit;

[0225] According to the number of the target power cabinets, the energy replenishment device in the energy storage system is controlled to replenish the power of the target power cabinets.

[0226] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0227] If the energy storage unit includes a target power cabinet, controlling the energy replenishment device to replenish power for the target power cabinet;

[0228] If the energy storage unit includes a plurality of the target power cabinets, the energy replenishment device is controlled to replenish power for the plurality of the target power cabinets according to a preset charging strategy.

[0229] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0230] Controlling the energy replenishment device to charge each of the target power cabinets to a first preset charge threshold;

[0231] The energy replenishment device is controlled to charge each of the target power cabinets once to a second preset charge threshold, and to charge the power cabinets after the first charge for a second time to the first preset charge threshold; the second preset charge threshold is less than the first preset charge threshold.

[0232] The computer device provided in the above embodiment has an implementation principle and technical effects similar to those of the above method embodiment, which will not be described in detail here.

[0233] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0234] When the energy storage unit in the energy storage system does not meet the preset power requirement, determining the target power cabinet to be replenished in the energy storage unit;

[0235] Control the energy replenishment device in the energy storage system to replenish power for the target electric cabinet.

[0236] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0237] Determining the number of target electrical cabinets in the energy storage unit;

[0238] According to the number of the target power cabinets, the energy replenishment device in the energy storage system is controlled to replenish the power of the target power cabinets.

[0239] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0240] If the energy storage unit includes a target power cabinet, controlling the energy replenishment device to replenish power for the target power cabinet;

[0241] If the energy storage unit includes a plurality of the target power cabinets, the energy replenishment device is controlled to replenish power for the plurality of the target power cabinets according to a preset charging strategy.

[0242] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0243] Controlling the energy replenishment device to charge each of the target power cabinets to a first preset charge threshold;

[0244] The energy replenishment device is controlled to charge each of the target power cabinets once to a second preset charge threshold, and to charge the power cabinets after the first charge for a second time to the first preset charge threshold; the second preset charge threshold is less than the first preset charge threshold.

[0245] The above embodiment provides a computer-readable storage medium, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0246] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0247] When the energy storage unit in the energy storage system does not meet the preset power requirement, determining the target power cabinet to be replenished in the energy storage unit;

[0248] Control the energy replenishment device in the energy storage system to replenish power for the target electric cabinet.

[0249] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0250] Determining the number of target electrical cabinets in the energy storage unit;

[0251] According to the number of the target power cabinets, the energy replenishment device in the energy storage system is controlled to replenish the power of the target power cabinets.

[0252] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0253] If the energy storage unit includes a target power cabinet, controlling the energy replenishment device to replenish power for the target power cabinet;

[0254] If the energy storage unit includes a plurality of the target power cabinets, the energy replenishment device is controlled to replenish power for the plurality of the target power cabinets according to a preset charging strategy.

[0255] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0256] Controlling the energy replenishment device to charge each of the target power cabinets to a first preset charge threshold;

[0257] The energy replenishment device is controlled to charge each of the target power cabinets once to a second preset charge threshold, and to charge the power cabinets after the first charge for a second time to the first preset charge threshold; the second preset charge threshold is less than the first preset charge threshold.

[0258] The above embodiment provides a computer program product, whose implementation principle and technical effect are similar to those of the above method embodiment, and will not be repeated here.

[0259] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed 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 the memory, database or other medium used in the embodiments provided in 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 memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access 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 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. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0260] The technical features of the above embodiments may 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.

[0261] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations 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 shall be subject to the attached claims.

Claims

1. A method for replenishing energy, characterized in that: Applied to an energy storage system, the method comprises: When the energy storage unit in the energy storage system does not meet the preset power requirement, determining the target power cabinet to be replenished in the energy storage unit; Control the energy replenishment device in the energy storage system to replenish power for the target electric cabinet.

2. The energy replenishment method according to claim 1, characterized in that: The controlling the energy replenishment device in the energy storage system to replenish the target electric cabinet with electricity includes: Determining the number of target electrical cabinets in the energy storage unit; According to the number of the target power cabinets, the energy replenishment device in the energy storage system is controlled to replenish the power of the target power cabinets.

3. The energy replenishment method according to claim 2, characterized in that: The controlling the energy replenishment device in the energy storage system to replenish the target electric cabinets with electricity according to the number of the target electric cabinets includes: If the energy storage unit includes a target power cabinet, controlling the energy replenishment device to replenish power for the target power cabinet; If the energy storage unit includes a plurality of the target power cabinets, the energy replenishment device is controlled to replenish power for the plurality of the target power cabinets according to a preset charging strategy.

4. The energy replenishment method according to claim 3, characterized in that: The charging strategy includes any one of the following: Controlling the energy replenishment device to charge each of the target power cabinets to a first preset charge threshold; Controlling the energy replenishment device to charge each of the target power cabinets once to a second preset charge threshold, and to charge the power cabinets after the first charge a second time to the first preset charge threshold; The second preset charge threshold is smaller than the first preset charge threshold.

5. The energy replenishment method according to claim 4, characterized in that: The second preset charge threshold is a maximum charge amount among the plurality of target electrical cabinets.

6. The energy replenishment method according to any one of claims 1 to 5, characterized in that: After determining the target electric cabinet to be replenished in the energy storage unit, the method further includes: Determining an energy replenishment device according to the power of the energy storage unit and the power of the energy replenishment device; The controlling the energy replenishment device in the energy storage system to replenish the target electric cabinet with electricity includes: The energy replenishment device is controlled to replenish power for the target electric cabinet.

7. The energy replenishment method according to claim 6, characterized in that: The step of determining the energy replenishment device according to the power of the energy storage unit and the power of the energy replenishment device includes: Determining whether the power of the energy storage unit is greater than the power of the energy replenishment device; If the amount of electricity in the energy storage unit is greater than the amount of electricity in the energy replenishment device, the first reactance in the energy storage system and the energy replenishment device are used as the energy replenishment device; If the power of the energy storage unit is not greater than the power of the energy charging device, the energy charging device is used as the energy charging device.

8. The energy replenishment method according to claim 7, characterized in that: If the amount of electricity in the energy storage unit is greater than the amount of electricity in the energy replenishment device, the first reactance in the energy storage system and the energy replenishment device are used as the energy replenishment device, including: If the power of the energy storage unit is greater than the power of the energy replenishment device, determine whether the power of the energy storage unit is greater than the sum of the power of the energy replenishment device and the first reactance; If the amount of electricity in the energy storage unit is greater than the sum of the electricity, the first reactance in the energy storage system, the energy replenishment device, and the second reactance in the energy storage system are used as the energy replenishment device; If the amount of electricity in the energy storage unit is not greater than the amount of electricity in the energy compensation system, the first reactance in the energy storage system and the energy compensation device are used as the energy compensation components.

9. An energy storage system, characterized in that: The energy storage system comprises: at least one energy storage submodule, an energy replenishment device and a controller; the energy storage submodule comprises a power unit and an energy storage unit connected in parallel, the energy storage unit comprises a plurality of electric cabinet branches connected in parallel, each electric cabinet branch comprises an electric cabinet and a first switch connected in series, the controller is respectively connected to the energy storage submodule and the energy replenishment device; the energy replenishment device is connected in parallel to each of the electric cabinet branches; The controller is used to execute the energy replenishment method as described in any one of claims 1-7.

10. The energy storage system according to claim 9, characterized in that: The electrical cabinet branch also includes a current limiting device; the current limiting device is connected in parallel with the first switch.

11. The energy storage system according to claim 10, characterized in that: The current limiting device is a resistor.

12. The energy storage system according to claim 11, characterized in that: The current limiting device also includes a second switch; one end of the second switch is connected to one end of the resistor, and the other end of the resistor is respectively connected to the common end of the first switch and the electric cabinet; the other end of the second switch is connected to the common end of the first switch and the power unit.

13. The energy storage system according to any one of claims 9 to 12, characterized in that: The power unit includes a switch branch and a capacitor connected in parallel, and the switch branch includes a third switch and a fourth switch connected in series.

14. The energy storage system according to any one of claims 9 to 12, characterized in that: The energy storage system includes N energy storage submodules connected in series, the positive output end of the first energy storage submodule among the N energy storage submodules is connected to one end of the energy compensation device, and the negative output end of the Nth energy storage submodule is connected to the other end of the energy compensation device.

15. The energy storage system according to claim 14, characterized in that: The energy storage system further includes a first reactance; the positive output end of the first energy storage submodule is connected to one end of the first reactance, and the other end of the first reactance is connected to one end of the energy compensation device.

16. The energy storage system according to claim 15, characterized in that: The energy storage system also includes a second reactance; the negative output end of the Nth energy storage submodule is connected to one end of the second reactance, and the other end of the second reactance is connected to one end of the energy compensation device.

17. An energy replenishment device, characterized in that: The energy replenishment device comprises: A determination module, used to determine a target electric cabinet to be charged in the charging unit when the energy storage unit in the energy storage system does not meet the preset power requirement; The control module is used to control the energy replenishment device in the energy storage system to replenish the target electric cabinet with electricity.

18. 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 1 to 16 are implemented.

19. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 16 are implemented.

20. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 16 are implemented.

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