Energy storage valve and control method and control device therefor, and energy storage device

Abstract

The present application relates to an energy storage valve and a control method and control device therefor, and an energy storage device. The energy storage valve may comprise at least two energy storage modules which can be connected to a main line of the energy storage valve, a current limiting circuit, and an electrical parameter measurement circuit which can be used for measuring electrical parameters in the circuit, wherein the current limiting circuit and the electrical parameter measurement circuit are both connected to a grounding point on the main line of the energy storage valve, the grounding point is connected to the ground, and the electrical parameter measurement circuit is arranged between the grounding point and the ground. According to embodiments of the present application, whether a ground short circuit has occurred inside the energy storage valve can be detected in a timely manner, so that short-circuit protection can be carried out in a timely manner when the ground short circuit is present inside the energy storage valve, and the extent of damage to the energy storage valve caused by a fault current can be reduced as much as possible, thereby protecting the energy storage valve.

Description

Energy storage valve, energy storage valve control method, control device and energy storage device Cross-references

[0001] This application refers to Chinese patent application No. 202410178024X filed on February 8, 2024, entitled “Energy storage valve, control method for energy storage valve, control device and energy storage device”, which is incorporated into this application in its entirety by reference. Technical Field

[0002] The present application relates to the field of energy storage technology, and in particular to an energy storage valve, a control method for the energy storage valve, a control device, and an energy storage device. Background Art

[0003] With the development of energy storage technology, direct-mounted energy storage valves have become one of the mainstream technical directions in energy storage technology.

[0004] In related technologies, direct-mounted energy storage valves can include multiple, cascaded energy storage modules, often of relatively large size. This can lead to a high number of ground-connected pipes and / or insulators, posing a significant risk of insulation failure within the valve.

[0005] However, the short-circuit protection method to the ground in the related art cannot be applied to the situation where a short circuit to the ground occurs inside the energy storage valve. Summary of the Invention

[0006] In view of the above problems, the present application provides an energy storage valve, a control method for the energy storage valve, a control device and an energy storage device, which can solve the problem that the short-circuit protection method to the ground in the related art cannot be applied to the short-circuit situation to the ground inside the energy storage valve.

[0007] In a first aspect, the present application provides an energy storage valve, which includes at least two energy storage modules that can be connected in series to a main circuit of the energy storage valve, a current limiting circuit, and an electrical parameter detection circuit that can be used to detect electrical parameters in the circuit;

[0008] Among them, the current limiting circuit and the electrical parameter detection circuit are both connected to the grounding point on the energy storage valve main line, the grounding point is connected to the ground, and the electrical parameter detection circuit is arranged between the grounding point and the ground.

[0009] In the technical solution of the embodiment of the present application, on the one hand, by providing a current limiting circuit, the magnitude of the fault current and / or the rate of current rise when a short circuit to ground occurs inside the energy storage valve can be limited, so that the degree of damage caused by the fault current to the energy storage valve can be minimized, thereby facilitating the protection of the energy storage valve. On the other hand, by providing an electrical parameter detection circuit between the grounding point and the ground, the electrical parameters of the grounding branch between the grounding point and the ground can be detected, so that whether a short circuit to ground occurs inside the energy storage valve can be monitored in a timely manner. In this way, if a short circuit to ground is detected inside the energy storage valve, short-circuit protection can be promptly performed, thereby further facilitating the protection of the energy storage valve.

[0010] In some embodiments, a first portion of the at least two energy storage modules are located on one side of the grounding point, and a second portion of the at least two energy storage modules are located on the other side of the grounding point.

[0011] In the technical solution of the embodiment of the present application, the energy storage valve is grounded at the midpoint of the energy storage valve main line, so that when a short circuit to ground occurs inside the energy storage valve, the fault current can be grounded through the grounding branch, and the short circuit to ground fault is discovered in time through the electrical parameter detection circuit, so that short-circuit protection can be performed in time, thereby minimizing the expansion of the fault.

[0012] In some embodiments, the difference between the number of the first part of energy storage modules and the number of the second part of energy storage modules is less than a preset number, so that the difference in the number of energy storage modules that can be in the cut-in state on both sides of the grounding point can be less than the preset difference, which is conducive to further improving the stability of the bus voltage of the energy storage valve.

[0013] In some embodiments, the current limiting circuit includes a first current limiting unit disposed between the first portion of the energy storage module and the second portion of the energy storage module, and / or a second current limiting unit disposed between the grounding point and the ground.

[0014] In some embodiments, the first current limiting unit includes a first reactor and a second reactor;

[0015] Wherein, the first reactor is arranged between the first part of the energy storage module and the grounding point;

[0016] The second reactor is arranged between the second part of the energy storage module and the grounding point.

[0017] In the technical solution of the embodiment of the present application, by respectively providing reactors on the upper and lower arms near the grounding point on the main line of the energy storage valve, it is possible to limit the rising speed of the fault current, create protection time, and thus improve the reliability of the energy storage valve, regardless of whether a short circuit to ground occurs on the upper arm or the lower arm near the grounding point inside the energy storage valve.

[0018] In some embodiments, the second current limiting unit includes a third reactor and / or a first resistor.

[0019] In the technical solution of the embodiment of the present application, by providing a third inductor and / or a first resistor on the grounding branch between the grounding point and the ground, the rising speed and / or magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, thereby improving the reliability of the energy storage valve.

[0020] In some embodiments, at least two energy storage modules are located on one side of the grounding point so that the grounding point can be grounded through the current limiting circuit and the electrical parameter detection circuit, thereby realizing a unipolar energy storage valve with low line power, which is beneficial to reducing the operating cost of the energy storage valve.

[0021] In some embodiments, the current limiting circuit includes a third current limiting unit arranged between the grounding point and the ground, which can limit the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve, thereby improving the reliability of the energy storage valve.

[0022] In some embodiments, the third current limiting unit includes a fourth reactor.

[0023] In some embodiments, the energy storage valve further comprises: a control device connected to the at least two energy storage modules and the electrical parameter detection circuit;

[0024] Among them, the control device can determine whether a short circuit to ground occurs inside the energy storage valve based on the electrical parameters detected by the electrical parameter detection circuit, so that short-circuit protection can be performed in time when it is determined that a short circuit to ground occurs inside the energy storage valve, thereby protecting the normal operation of the energy storage valve.

[0025] In a second aspect, the present application provides a method for controlling an energy storage valve, wherein the energy storage valve is the energy storage valve according to any one of the first aspects above, the method comprising:

[0026] Acquiring an electrical parameter detected by a first electrical parameter detection circuit in the energy storage valve;

[0027] Determine whether a short circuit to ground occurs inside the energy storage valve based on electrical parameters.

[0028] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters includes:

[0029] If the electrical parameter is greater than or equal to the preset current threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0030] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters includes:

[0031] Determine the current change rate based on electrical parameters;

[0032] If the current change rate is greater than or equal to the preset change rate threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0033] In some embodiments, the energy storage valve further includes: a second electrical parameter detection circuit connected to a main circuit of the energy storage valve, wherein the other end of the second electrical parameter detection circuit is connected to the busbar; and determining whether a short circuit to ground occurs inside the energy storage valve based on the electrical parameters includes:

[0034] determining an electrical parameter difference between an electrical parameter detected by the second electrical parameter detection circuit and an electrical parameter detected by the first electrical parameter detection circuit;

[0035] If the electrical parameter difference is greater than or equal to the preset electrical parameter difference threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

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

[0037] If it is determined that a short circuit to ground occurs inside the energy storage valve, the energy storage valve is controlled to switch to a locked state.

[0038] In a third aspect, the present application provides a control device for an energy storage valve, wherein the energy storage valve is the energy storage valve according to any one of the first aspects above, and the device comprises:

[0039] An acquisition module, configured to acquire electrical parameters detected by a first electrical parameter detection circuit in the energy storage valve;

[0040] The determination module is used to determine whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters.

[0041] In a fourth aspect, the present application provides an energy storage device, comprising: an energy storage valve as described in any one of the first aspects above.

[0042] 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

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0044] FIG1 is a schematic structural diagram of an energy storage valve provided in some embodiments of the present application;

[0045] FIG2 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application;

[0046] FIG3 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application;

[0047] FIG4 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0048] FIG5 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0049] FIG6 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0050] FIG7 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0051] FIG8 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0052] FIG9 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0053] FIG10 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0054] FIG11 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0055] FIG12 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0056] FIG13 is a flow chart of a method for controlling an energy storage valve according to some embodiments of the present application;

[0057] FIG14 is a schematic structural diagram of a control device for an energy storage valve provided in some embodiments of the present application. DETAILED DESCRIPTION

[0058] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "include" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0060] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood 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 this application, the meaning of "plurality" is two or more (including two), unless otherwise clearly and specifically defined.

[0061] The energy storage valve, energy storage valve control method, control device and energy storage device involved in the embodiments of the present application can be applied to power system energy storage technology application scenarios; of course, they can also be applied to other scenarios.

[0062] The energy storage valve involved in the embodiments of the present application may include but is not limited to a direct current energy storage valve. It should be understood that for ease of understanding, the following embodiments of the present application are described using a high voltage direct current energy storage valve as an example.

[0063] Normally, a high-voltage DC direct-mounted energy storage valve can be applied to a unipolar DC system, a pseudo-bipolar DC system, or a true bipolar DC system. Among them, different types of DC systems have different protection methods when a ground fault occurs. 1) When a short circuit occurs to the ground on the DC bus side of a unipolar DC system, DC undervoltage protection can usually be used; 2) When a short circuit occurs to the ground on the DC bus side of a pseudo-bipolar DC system, bus overvoltage protection or bus differential voltage protection can usually be used; 3) When a short circuit occurs to the ground on the DC bus side of a true bipolar DC system, bus differential current protection or DC undervoltage protection can usually be used. It can be seen that the ground short-circuit protection method in the relevant technology is usually for the case where a short circuit occurs to the ground on the bus side.

[0064] Considering that the direct-mounted energy storage valve may include multiple cascaded energy storage modules, and the size of the energy storage modules is relatively large, a multi-valve tower series structure is required. Compared with the flexible direct system, the energy storage valve has a large number of pipes to the ground and / or a large number of insulators, and the risk of insulation failure inside the energy storage valve to the ground is relatively high. Among them, in the event of a short circuit to the ground in the area close to the ground inside the energy storage valve, the busbar voltage deviation to the ground is small, which belongs to the blind spot of the busbar overvoltage protection, busbar undervoltage protection, busbar differential pressure protection and busbar overcurrent protection in the related technology. The ground short-circuit protection method in the related technology cannot be applied to the situation of a ground short circuit inside the energy storage valve.

[0065] In order to solve the problem that the ground short-circuit protection method in the related art is not applicable to the situation of a ground short-circuit inside the energy storage valve, the embodiment of the present application proposes a method of providing a current limiting circuit and an electrical parameter detection circuit on the ground side of the energy storage valve. On the one hand, the fault current magnitude and / or current rise rate when a ground short-circuit occurs inside the energy storage valve can be limited, so that the degree of damage to the energy storage valve caused by the fault current can be alleviated as much as possible, thereby facilitating the protection of the energy storage valve. On the other hand, the electrical parameters on the grounding branch between the grounding point and the ground can be detected, so that whether a ground short-circuit occurs inside the energy storage valve can be monitored in a timely manner. In this way, short-circuit protection can be performed in a timely manner when a ground short-circuit is detected inside the energy storage valve, thereby facilitating further protection of the energy storage valve.

[0066] In some embodiments, Figure 1 is a structural schematic diagram of the energy storage valve provided in some embodiments of the present application. As shown in Figure 1, the energy storage valve of the embodiment of the present application may include at least two energy storage modules 11 that can be connected in series to the energy storage valve main line 10, a current limiting circuit 12, and an electrical parameter detection circuit 13 that can be used to detect electrical parameters in the circuit (for ease of distinction, it can be referred to as a first electrical parameter detection circuit).

[0067] The energy storage module 11 in the embodiment of the present application can be used to store or release electrical energy. Exemplarily, the energy storage module 11 can include but is not limited to an energy storage sub-module (SM).

[0068] It should be understood that the energy storage valve in the embodiment of the present application can adjust the switching state of each energy storage module 11 during operation. The switching state of the energy storage module 11 may include, but is not limited to, a cut-in state (or referred to as an on-state) or a cut-out state. When the energy storage module 11 is in the on-state, the energy storage module 11 is in a state of being connected in series to the energy storage valve main line 10; when the energy storage module 11 is in the cut-out state, the energy storage module 11 is in a bypassed state.

[0069] The current limiting circuit 12 in the embodiment of the present application can be used to limit the magnitude and / or rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve, so as to minimize the damage caused by the fault current to the energy storage valve, thereby facilitating the protection of the energy storage valve.

[0070] The electrical parameters in the embodiments of the present application may include but are not limited to current and / or voltage. For example, the electrical parameter detection circuit 13 may include but is not limited to an electrical parameter detection sensor or an electrical parameter detection module, wherein the electrical parameter detection sensor may include but is not limited to a photoelectric mutual inductor or a Hall sensor.

[0071] In the embodiment of the present application, the current limiting circuit 12 and the electrical parameter detection circuit 13 are both connected to a ground point GP on the energy storage valve main line 10, and the ground point GP is connected to the ground. It should be noted that the connection between any two circuits or any two locations involved in the embodiment of the present application may include a direct connection or an indirect connection.

[0072] In the embodiment of the present application, the electrical parameter detection circuit 13 can be disposed between the ground point GP and the ground, and is used to detect electrical parameters on the ground branch between the ground point GP and the ground, so as to promptly monitor whether a short circuit to ground occurs within the energy storage valve. For example, the electrical parameter detection circuit 13 can be directly connected to the ground point GP, or can be connected to the ground point GP through the electrical parameter detection circuit 13.

[0073] Illustratively, the energy storage valve according to the embodiment of the present application may adopt a midpoint grounding method or an end grounding method.

[0074] In one possible implementation, as shown in FIG1 , where the energy storage valve employs a midpoint grounding method, the grounding point GP in the embodiment of the present application can be located between any two energy storage modules 11 on the energy storage valve trunk line 10. It should be understood that the two ends of the energy storage valve trunk line 10 can be connected to the positive busbar and the negative busbar, respectively. For example, the two ends of the energy storage valve trunk line 10 can be connected to the positive and negative busbars, respectively, via corresponding reactors, or can be connected to the positive and negative busbars via other methods.

[0075] Exemplarily, a first portion of the at least two energy storage modules 11 on the energy storage valve trunk line 10 is located on one side of the grounding point GP, and a second portion of the at least two energy storage modules 11 is located on the other side of the grounding point GP.

[0076] In the embodiment of the present application, the energy storage valve is grounded at the midpoint of the energy storage valve main line 10, so that when a short circuit to ground occurs inside the energy storage valve, the fault current can be grounded through the grounding branch, and the short circuit to ground fault can be discovered in time through the electrical parameter detection circuit, so that short-circuit protection can be performed in time, thereby minimizing the expansion of the fault.

[0077] Furthermore, the difference between the number of the first part of the energy storage modules and the number of the second part of the energy storage modules is less than a preset number, so that the difference in the number of energy storage modules that can be in the cut-in state and located on both sides of the grounding point GP can be less than the preset difference, which is conducive to further improving the stability of the bus voltage of the energy storage valve.

[0078] In another possible implementation, FIG2 is a schematic diagram of the structure of an energy storage valve provided in other embodiments of the present application. As shown in FIG2, when the energy storage valve adopts an end-grounding method, the grounding point GP in the embodiment of the present application can be located at the end of the energy storage valve trunk line 10, wherein the head end of the energy storage valve trunk line 10 can be connected to a unipolar busbar. For example, the head end of the energy storage valve trunk line 10 can be connected to the unipolar busbar through a corresponding inductor, or can be connected to the unipolar busbar through other methods.

[0079] Illustratively, at least two energy storage modules 11 in the embodiment of the present application are located on one side of the grounding point GP, so that the grounding point GP can be grounded through the current limiting circuit 12 and the electrical parameter detection circuit 13, thereby realizing a unipolar energy storage valve with low line power, which is beneficial to reducing the operating cost of the energy storage valve.

[0080] In summary, the energy storage valve of the embodiment of the present application may include at least two energy storage modules that can be connected to the energy storage valve main line, a current limiting circuit, and an electrical parameter detection circuit that can be used to detect electrical parameters in the circuit. Among them, the current limiting circuit and the electrical parameter detection circuit are both connected to the grounding point on the energy storage valve main line, the grounding point is connected to the ground, and the electrical parameter detection circuit is arranged between the grounding point and the ground. It can be seen that in the embodiment of the present application, on the one hand, by setting the current limiting circuit, the fault current size and / or current rise rate when a short circuit to ground occurs inside the energy storage valve can be limited, so that the degree of damage caused by the fault current to the energy storage valve can be alleviated as much as possible, thereby facilitating the protection of the energy storage valve. On the other hand, by setting the electrical parameter detection circuit between the grounding point and the ground, the electrical parameters on the grounding branch between the grounding point and the ground can be detected, so that whether a short circuit to ground occurs inside the energy storage valve can be monitored in a timely manner, so that short circuit protection can be performed in a timely manner when a short circuit to ground occurs inside the energy storage valve, thereby facilitating further protection of the energy storage valve.

[0081] In some embodiments, based on the above embodiments, the present invention provides an exemplary description of the current limiting circuit 12. The current limiting circuit 12 in the present embodiment may include a first current limiting unit disposed between the first and second energy storage modules, and / or a second current limiting unit disposed between the grounding point GP and the ground. It should be understood that the first current limiting unit in the present embodiment may be connected in series to the energy storage valve main line 10, and the grounding point GP may be located within the first current limiting unit.

[0082] The first current limiting unit in the embodiment of the present application can be used to limit the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve; the second current limiting unit can be used to limit the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve, and / or further limit the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve.

[0083] In one possible implementation, Figure 3 is a schematic structural diagram of the energy storage valve provided in other embodiments of the present application. As shown in Figure 3, the current limiting circuit 12 in the embodiment of the present application may include a first current limiting unit 120 arranged between the first part of the energy storage module and the second part of the energy storage module, wherein the grounding point GP on the energy storage valve main line 10 (i.e., the grounding point GP in the first current limiting unit 120) can be connected to the ground through the electrical parameter detection circuit 13, so that the electrical parameters on the grounding branch between the grounding point GP and the ground can be collected, thereby timely monitoring whether a short circuit to ground occurs inside the energy storage valve.

[0084] For example, FIG4 is a schematic diagram of the structure of an energy storage valve provided in other embodiments of the present application. As shown in FIG4, the first current limiting unit 120 in the embodiment of the present application may include, but is not limited to, a first reactor L1 and a second reactor L2. The first reactor L1 may be disposed between the first portion of the energy storage module and the grounding point GP; the second reactor L2 may be disposed between the second portion of the energy storage module and the grounding point GP.

[0085] It should be understood that in the embodiment of the present application, one end of the energy storage valve trunk line 10 can be connected to the positive bus through the positive inductor Lp and the positive electrical parameter detection circuit DCp, and the other end of the energy storage valve trunk line 10 can be connected to the negative bus through the negative inductor Ln and the negative electrical parameter detection circuit DCn. Of course, the two ends of the energy storage valve trunk line 10 can also be connected to the positive and negative busbars in other ways.

[0086] It should be noted that the first current limiting unit 120 in the embodiment of the present application may also include a larger number of reactors, or other devices with the function of limiting the current rising speed.

[0087] In the embodiment of the present application, by providing reactors on the upper and lower arms of the energy storage valve main line 10 near the grounding point GP, respectively, it is possible to limit the rising speed of the fault current regardless of whether a short circuit to ground occurs on the upper arm or the lower arm near the grounding point GP inside the energy storage valve, thereby creating a protection time, thereby improving the reliability of the energy storage valve.

[0088] In another possible implementation, FIG5 is a schematic diagram of the structure of an energy storage valve provided in other embodiments of the present application. As shown in FIG5 , the current limiting circuit 12 in the embodiment of the present application may include a second current limiting unit 121 disposed between the grounding point GP and the ground. Furthermore, an electrical parameter detection circuit 13 is disposed between the grounding point GP and the ground to facilitate the acquisition of electrical parameters on the grounding branch between the grounding point GP and the ground, thereby enabling timely monitoring of whether a short circuit to ground occurs within the energy storage valve. It should be understood that the positions of the second current limiting unit 121 and the electrical parameter detection circuit 13 on the grounding branch can be interchanged.

[0089] In an embodiment of the present application, a second current limiting unit is provided on the grounding branch between the grounding point and the ground, so that the positive and negative currents during the normal operation of the energy storage valve do not flow through the second current limiting unit, thereby saving the loss during the normal operation of the energy storage valve.

[0090] The second current limiting unit 121 in the embodiment of the present application may include, but is not limited to, a third reactor and / or a first resistor. The third reactor may be used to limit the rate of rise of the fault current when a short circuit to ground occurs inside the energy storage valve, and the first resistor may be used to limit the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve.

[0091] For example, FIG6 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application. As shown in FIG6, the second current limiting unit 121 in the embodiments of the present application may include, but is not limited to, a third reactor L3. In the embodiments of the present application, by providing a third reactor on the grounding branch between the grounding point and the ground, the rate of rise of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited. This not only saves reactors, thereby reducing the production cost of the energy storage valve, but also reduces losses during normal operation of the energy storage valve.

[0092] As another example, Figure 7 is a structural schematic diagram of the energy storage valve provided in other embodiments of the present application. As shown in Figure 7, the second current limiting unit 121 in the embodiment of the present application may include a third inductor L3 and a first resistor R1; it should be understood that the positions of the third inductor L3 and the first resistor R1 on the grounding branch can be interchanged.

[0093] In the embodiment of the present application, by providing a third inductor and a first resistor on the grounding branch between the grounding point and the ground, it is possible to limit the rising speed and magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve, and also to save the inductor, thereby saving the production cost of the energy storage valve.

[0094] In another possible implementation, FIG8 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application. As shown in FIG8 , the current limiting circuit 12 of the embodiment of the present application may include a first current limiting unit 120 disposed between the first energy storage module and the second energy storage module, and a second current limiting unit 121 disposed between the grounding point GP and the ground. An electrical parameter detection circuit 13 is also provided between the grounding point GP and the ground to facilitate the acquisition of electrical parameters on the grounding branch between the grounding point GP and the ground, thereby enabling timely monitoring of whether a short circuit to ground occurs inside the energy storage valve. It should be understood that the positions of the second current limiting unit 121 and the electrical parameter detection circuit 13 on the grounding branch can be interchanged.

[0095] It should be noted that the structures of the first current limiting unit 120 and the second current limiting unit 121 may refer to the relevant contents in the above embodiments, which will not be described again here.

[0096] For example, FIG9 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application. As shown in FIG9 , the first current limiting unit of the current limiting circuit 12 in the embodiment of the present application may include but is not limited to a first inductor L1 and a second inductor L2, and the second current limiting unit 121 may include but is not limited to a third inductor L3.

[0097] In the embodiment of the present application, by respectively providing reactors on the upper and lower arms of the energy storage valve main line close to the grounding point, and providing a third reactor on the grounding branch between the grounding point and the ground, the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve can be further limited, thereby further improving the reliability of the energy storage valve.

[0098] For example, FIG10 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application. As shown in FIG10 , the first current limiting unit of the current limiting circuit 12 in the embodiment of the present application may include but is not limited to a first inductor L1 and a second inductor L2, and the second current limiting unit may include but is not limited to a first resistor R1.

[0099] In the embodiment of the present application, by respectively providing reactors on the upper and lower arms of the energy storage valve main line near the grounding point, and providing a first resistor on the grounding branch between the grounding point and the ground, not only the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, but also the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, thereby further improving the reliability of the energy storage valve.

[0100] For example, FIG11 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application. As shown in FIG11 , the first current limiting unit of the current limiting circuit 12 in the embodiment of the present application may include, but is not limited to, a first reactor L1 and a second reactor L2, and the second current limiting unit may include, but is not limited to, a third reactor L3 and a first resistor R1. It should be understood that the positions of the third reactor L3, the first resistor R1, and the electrical parameter detection circuit 13 on the grounding branch can be interchanged.

[0101] In the embodiment of the present application, by respectively providing reactors on the upper and lower arms of the energy storage valve main line close to the grounding point, and providing a third reactor and a first resistor on the grounding branch between the grounding point and the ground, the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve can be further limited, and the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, thereby further improving the reliability of the energy storage valve.

[0102] In some embodiments, based on the above embodiments, the relevant contents of the current limiting circuit 12 are further exemplarily introduced and explained in the embodiments of the present application. Figure 12 is a structural schematic diagram of the energy storage valve provided in other embodiments of the present application. As shown in Figure 12, the current limiting circuit 12 of the embodiment of the present application may include a third current limiting unit 122 arranged between the grounding point GP and the ground. Among them, an electrical parameter detection circuit 13 (for the sake of convenience of distinction, it can be referred to as a second electrical parameter detection circuit) is also provided between the grounding point GP and the ground, so that the electrical parameters on the grounding branch between the grounding point GP and the ground can be collected, so that whether a short circuit to the ground occurs inside the energy storage valve can be monitored in a timely manner.

[0103] It should be understood that in the embodiment of the present application, the head end of the energy storage valve trunk line 10 is connected to the unipolar busbar via the reactor L and the unipolar electrical parameter detection circuit as an example; of course, the head end of the energy storage valve trunk line 10 can also be connected to the unipolar busbar via other methods. The positions of the third current limiting unit 122 and the electrical parameter detection circuit 13 on the grounding branch in the embodiment of the present application can be interchanged.

[0104] The third current limiting unit 122 in the embodiment of the present application can be used to limit the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve. For example, the third current limiting unit 122 in the embodiment of the present application can include but is not limited to a fourth reactor.

[0105] In the embodiment of the present application, by providing a third current limiting unit on the grounding branch between the grounding point and the ground, the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, thereby improving the reliability of the energy storage valve.

[0106] In some embodiments, based on the above embodiments, the energy storage valve in the embodiments of the present application may further include: a control device (not shown in the figure) connected to at least two energy storage modules 11 and an electrical parameter detection circuit 13 (for ease of distinction, it can be referred to as a first electrical parameter detection circuit) so that the detected electrical parameters can be obtained from the electrical parameter detection circuit 13, and the switching state of the energy storage module 11 can be controlled.

[0107] The control device in the embodiment of the present application can determine whether a short circuit to ground occurs inside the energy storage valve based on the electrical parameters detected by the electrical parameter detection circuit 13. If a short circuit to ground occurs inside the energy storage valve, short-circuit protection can be promptly implemented, thereby protecting the energy storage valve from normal operation. The short-circuit protection in the embodiment of the present application can include, but is not limited to, controlling the energy storage valve to switch to a locked state.

[0108] Optionally, the control device can determine the current magnitude or current rising rate on the grounding branch between the grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit, and then determine whether a short circuit to ground occurs inside the energy storage valve based on the current magnitude or current rising rate on the grounding branch.

[0109] In the following embodiments of the present application, examples are given for describing how to determine whether a short circuit to ground occurs inside an energy storage valve when the energy storage valve adopts a midpoint grounding method and an end grounding method.

[0110] In some embodiments, when the energy storage valve adopts a mid-point grounding method, the control device can determine the current size or current rising rate on the grounding branch between the grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit, and then determine whether a short circuit to the ground occurs inside the energy storage valve based on the current size or current rising rate on the grounding branch.

[0111] In one possible implementation, when the electrical parameter detected by the first electrical parameter detection circuit includes current, the control device can determine whether a short circuit to ground occurs inside the energy storage valve by comparing the electrical parameter detected by the first electrical parameter detection circuit with a preset current threshold.

[0112] Exemplarily, the preset current threshold may include but is not limited to the product of a first preset safety factor and a preset rated current; the first preset safety factor may include but is not limited to any value between 0 and 1; the preset rated current may include but is not limited to the current on the grounding branch when any energy storage module connected to the energy storage valve main line is short-circuited to ground.

[0113] Furthermore, if the electrical parameter detected by the first electrical parameter detection circuit is greater than or equal to a preset current threshold, the control device may deem that at least one energy storage module connected to the energy storage valve trunk line has a short circuit to ground, thereby determining that a short circuit to ground has occurred inside the energy storage valve.

[0114] It should be understood that if the electrical parameter detected by the first electrical parameter detection circuit is less than the preset current threshold, the control device can assume that none of the energy storage modules connected to the energy storage valve main line has a short circuit to ground, thereby determining that no short circuit to ground has occurred inside the energy storage valve.

[0115] It should be noted that when the electrical parameters detected by the first electrical parameter detection circuit include non-current parameters, the control device can determine the current on the grounding branch between the grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit, and then determine whether a short circuit to the ground occurs inside the energy storage valve based on the current size on the grounding branch between the grounding point and the ground.

[0116] It can be seen that in the embodiment of the present application, since the electrical parameters detected by the first electrical parameter detection circuit can accurately indicate the electrical parameters on the grounding branch between the grounding point and the ground when a short circuit to ground occurs inside the energy storage valve, by comparing the electrical parameters detected by the first electrical parameter detection circuit with the preset current threshold, it can be accurately determined whether a short circuit to ground occurs inside the energy storage valve.

[0117] In another possible implementation, the control device can determine the current change rate based on the electrical parameters detected by the first electrical parameter detection circuit, and determine whether a short circuit to ground occurs inside the energy storage valve by comparing the current change rate with a preset change rate threshold.

[0118] Exemplarily, the preset change speed threshold may include, but is not limited to, the product of a second preset safety factor and a preset rated current conversion speed.

[0119] Illustratively, the second preset safety factor in the embodiment of the present application may include but is not limited to any value between 0 and 1; the preset rated current conversion speed may include but is not limited to the current conversion speed on the grounding branch when any energy storage module close to the grounding point on the energy storage valve main line is short-circuited to the ground.

[0120] For example, the preset rated current conversion speed in the following embodiments of the present application may include but is not limited to the ratio of the voltage of any energy storage module close to the grounding point on the energy storage valve trunk line to the short-circuit loop inductance.

[0121] It should be noted that the short-circuit inductance is related to the current limiting circuit in the energy storage valve. For example, when the current limiting circuit of the energy storage valve adopts the structure shown in Figure 4 or Figure 10, the short-circuit inductance can be the value of the first inductor L1 or the second inductor L2. For another example, when the current limiting circuit of the energy storage valve adopts the structure shown in Figure 6 or Figure 7, the short-circuit inductance can be the value of the third inductor L3. For another example, when the current limiting circuit of the energy storage valve adopts the structure shown in Figure 9 or Figure 11, the short-circuit inductance can be the sum of the values ​​of the first inductor L1 and the third inductor L3, or the sum of the values ​​of the second inductor L2 and the third inductor L3.

[0122] For example, if the current change rate is greater than or equal to a preset change rate threshold, the control device may deem that at least one energy storage module connected to the energy storage valve trunk line has a short circuit to ground, thereby determining that a short circuit to ground has occurred inside the energy storage valve.

[0123] It should be understood that if the current change rate is less than the preset change rate threshold, the control device can assume that none of the energy storage modules connected to the energy storage valve main line has a short circuit to ground, thereby determining that no short circuit to ground has occurred inside the energy storage valve.

[0124] It can be seen that in the embodiment of the present application, since the electrical parameters detected by the first electrical parameter detection circuit can accurately indicate the electrical parameters on the grounding branch between the grounding point and the ground when a short circuit to ground occurs inside the energy storage valve, the current change rate determined based on the electrical parameters can accurately indicate the current conversion speed on the grounding branch between the grounding point and the ground. By comparing the current conversion speed with the preset change speed threshold, it can be accurately determined whether a short circuit to ground occurs inside the energy storage valve.

[0125] In some embodiments, when the energy storage valve adopts an end grounding method, the control device can determine the current rising rate on the grounding branch between the grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit, and then determine whether a short circuit to the ground occurs inside the energy storage valve based on the current rising rate on the grounding branch.

[0126] It should be noted that when the energy storage valve adopts the end grounding method, the relevant content of how the control device determines whether a short circuit to ground occurs inside the energy storage valve based on the current rise rate on the grounding branch can be referred to the relevant content when the energy storage valve adopts the midpoint grounding method mentioned above, and will not be repeated here.

[0127] In some embodiments, when the energy storage valve uses an end-to-end grounding method, the control device can determine the current magnitude on the grounding branch between the grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit, and determine the current magnitude between the head end of the energy storage valve main line and the unipolar busbar based on the electrical parameters detected by the second electrical parameter detection circuit. Furthermore, the control device can determine whether a short circuit to ground occurs inside the energy storage valve based on the current magnitude on the grounding branch between the grounding point and the ground and the current magnitude between the head end of the energy storage valve main line and the unipolar busbar. One end of the second electrical parameter detection circuit is connected to the energy storage valve main line, and the other end is connected to the busbar.

[0128] In one possible implementation, when the electrical parameter detected by the electrical parameter detection circuit includes current, the control device can determine the electrical parameter difference between the electrical parameter detected by the second electrical parameter detection circuit and the electrical parameter detected by the first electrical parameter detection circuit, and determine whether a short circuit to ground occurs inside the energy storage valve by comparing the electrical parameter difference with a preset electrical parameter difference threshold.

[0129] Exemplarily, the preset electrical parameter difference threshold may include, but is not limited to, a product of a third preset safety factor and a preset rated electrical parameter difference.

[0130] Illustratively, the third preset safety factor in the embodiment of the present application may include but is not limited to any value between 0 and 1; the preset rated electrical parameter difference may include but is not limited to the difference between the electrical parameters detected by the second electrical parameter detection circuit and the electrical parameters detected by the first electrical parameter detection circuit when a short circuit occurs to ground in the energy storage module near the grounding point on the energy storage valve main line.

[0131] For example, if the electrical parameter difference is greater than or equal to a preset electrical parameter difference threshold, the control device may deem that at least one energy storage module connected to the energy storage valve trunk line has a short circuit to ground, thereby determining that a short circuit to ground has occurred inside the energy storage valve.

[0132] It should be understood that if the electrical parameter difference is less than the preset electrical parameter difference threshold, the control device may deem that none of the energy storage modules connected to the energy storage valve trunk line has a short circuit to ground, thereby determining that no short circuit to ground has occurred inside the energy storage valve.

[0133] It can be seen that in the embodiment of the present application, since the electrical parameters detected by the first electrical parameter detection circuit and the second electrical parameter detection circuit can accurately indicate the electrical parameters of the corresponding position when a short circuit to ground occurs inside the energy storage valve, by comparing the electrical parameter difference between the electrical parameters detected by the first electrical parameter detection circuit and the second electrical parameter detection circuit with the preset electrical parameter difference threshold, it is possible to accurately determine whether a short circuit to ground occurs inside the energy storage valve.

[0134] Of course, the control device may also determine whether a short circuit to ground occurs inside the energy storage valve in other ways based on the electrical parameters detected by the electrical parameter detection circuit.

[0135] In some embodiments, FIG13 is a flow chart of a method for controlling an energy storage valve provided in some embodiments of the present application. The energy storage valve in the embodiments of the present application may be the energy storage valve in any of the above embodiments. In the embodiments of the present application, the method is described by applying the method to the control device in the above energy storage valve as an example. As shown in FIG13, the method in the embodiments of the present application may include the following steps:

[0136] Step S1301: Acquire electrical parameters detected by a first electrical parameter detection circuit in the energy storage valve.

[0137] Step S1302: Determine whether a short circuit to ground occurs inside the energy storage valve according to the electrical parameters.

[0138] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters in step S1302 may include:

[0139] If the electrical parameter is greater than or equal to the preset current threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0140] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters in step S1302 may include:

[0141] Determine the current change rate based on electrical parameters;

[0142] If the current change rate is greater than or equal to the preset change rate threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0143] In some embodiments, the energy storage valve further includes: a second electrical parameter detection circuit connected to the energy storage valve main circuit, wherein the other end of the second electrical parameter detection circuit is connected to the busbar; determining whether a short circuit to ground occurs inside the energy storage valve based on the electrical parameters in step S1302 may include:

[0144] determining an electrical parameter difference between an electrical parameter detected by the second electrical parameter detection circuit and an electrical parameter detected by the first electrical parameter detection circuit;

[0145] If the electrical parameter difference is greater than or equal to the preset electrical parameter difference threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0146] In some embodiments, the method of the embodiment of the present application may further include:

[0147] If it is determined that a short circuit to ground occurs inside the energy storage valve, the energy storage valve is controlled to switch to a locked state.

[0148] The specific implementation of the control method of the energy storage valve provided in the embodiment of the present application can refer to the relevant content in the above-mentioned energy storage valve embodiment of the present application. Its implementation principle and technical effects are similar and will not be repeated here.

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

[0150] Based on the same inventive concept, the present application also provides an energy storage valve control device for implementing the energy storage valve control method described above. The solution to the problem provided by this device is similar to the solution described in the above method. Therefore, the specific limitations in the embodiments of the control device for one or more energy storage valves provided below can be found in the definitions of the relevant content in the energy storage valve embodiments above, and will not be repeated here.

[0151] In some embodiments, Figure 14 is a schematic diagram of the structure of a control device for an energy storage valve provided in some embodiments of the present application. The energy storage valve in the embodiments of the present application can be the energy storage valve in any of the above embodiments. The control device for the energy storage valve provided in the embodiments of the present application can be applied to a control device for the energy storage valve. As shown in Figure 14, the control device for the energy storage valve in the embodiments of the present application may include: an acquisition module 1401 and a determination module 1402.

[0152] The acquisition module 1401 is configured to acquire electrical parameters detected by a first electrical parameter detection circuit in the energy storage valve;

[0153] The determination module 1402 is configured to determine whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters.

[0154] In some embodiments, the determination module 1402 is specifically configured to:

[0155] If the electrical parameter is greater than or equal to the preset current threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0156] In some embodiments, the determination module 1402 is specifically configured to:

[0157] Determine the current change rate based on electrical parameters;

[0158] If the current change rate is greater than or equal to the preset change rate threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0159] In some embodiments, the energy storage valve further includes: a second electrical parameter detection circuit connected to the energy storage valve main circuit, wherein the other end of the second electrical parameter detection circuit is connected to the bus; the determination module 1402 is specifically configured to:

[0160] determining an electrical parameter difference between an electrical parameter detected by the second electrical parameter detection circuit and an electrical parameter detected by the first electrical parameter detection circuit;

[0161] If the electrical parameter difference is greater than or equal to the preset electrical parameter difference threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0162] In some embodiments, the control device of the energy storage valve of the embodiment of the present application may further include:

[0163] The control module is used to control the energy storage valve to switch to a locked state if it is determined that a short circuit to ground occurs inside the energy storage valve.

[0164] The control device for the energy storage valve provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the control method for the energy storage valve described above. The implementation principle and technical effects thereof are similar and will not be described in detail here.

[0165] Each module in the above-mentioned image processing device can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of the processor in the control device in hardware form, or can be stored in the memory of the control device in software form, so that the processor can call and execute the corresponding operations of each module.

[0166] In some embodiments, a control device is also provided, including a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the technical solution in the above-mentioned energy storage valve control method embodiment of the present application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0167] In some embodiments, an energy storage device is also provided. The energy storage device may include an energy storage valve as provided in the above embodiments. Its implementation principle and technical effects are similar and will not be repeated here.

[0168] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. For purposes of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The processors involved in the various embodiments provided herein may be general-purpose processors, central processing units (CPUs), graphics processors (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like, without limitation thereto.

[0169] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A storage valve, wherein: The energy storage valve comprises at least two energy storage modules that can be connected in series to the main circuit of the energy storage valve, a current limiting circuit, and an electrical parameter detection circuit that can be used to detect electrical parameters in the circuit; Wherein, the current limiting circuit and the electrical parameter detection circuit are both connected to a grounding point on the energy storage valve main line, the grounding point is connected to the ground, and the electrical parameter detection circuit is arranged between the grounding point and the ground.

2. The energy storage valve according to claim 1, wherein: A first portion of the energy storage modules among the at least two energy storage modules are located on one side of the grounding point, and a second portion of the energy storage modules among the at least two energy storage modules are located on the other side of the grounding point.

3. The energy storage valve according to claim 2, wherein: The difference between the number of the first part of energy storage modules and the number of the second part of energy storage modules is less than a preset number.

4. The energy storage valve according to claim 2 or 3, wherein: The current limiting circuit includes a first current limiting unit arranged between the first part of the energy storage module and the second part of the energy storage module, and / or a second current limiting unit arranged between the grounding point and the ground.

5. The energy storage valve according to claim 4, wherein: The first current limiting unit includes a first reactor and a second reactor; Wherein, the first reactor is arranged between the first part of the energy storage module and the grounding point; The second reactor is arranged between the second energy storage module and the grounding point.

6. The energy storage valve according to claim 4 or 5, wherein: The second current limiting unit includes a third reactor and / or a first resistor.

7. The energy storage valve according to claim 1, wherein: At least two of the energy storage modules are located on one side of the grounding point.

8. The energy storage valve according to claim 7, wherein: The current limiting circuit includes a third current limiting unit arranged between the grounding point and the ground.

9. The energy storage valve according to claim 8, wherein: The third current limiting unit includes a fourth reactor.

10. The energy storage valve according to any one of claims 1 to 9, wherein: The energy storage valve further comprises: a control device connected to at least two of the energy storage modules and the electrical parameter detection circuit; The control device may determine whether a short circuit to ground occurs inside the energy storage valve according to the electrical parameters detected by the electrical parameter detection circuit.

11. A method for controlling an energy storage valve, wherein: The energy storage valve is an energy storage valve according to any one of claims 1 to 10, and the method comprises: Acquiring an electrical parameter detected by a first electrical parameter detection circuit in the energy storage valve; Determine whether a short circuit to ground occurs inside the energy storage valve according to the electrical parameters.

12. The method according to claim 11, wherein The determining, based on the electrical parameters, whether a short circuit to ground occurs inside the energy storage valve includes: If the electrical parameter is greater than or equal to a preset current threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

13. The method according to claim 11, wherein The determining, based on the electrical parameters, whether a short circuit to ground occurs inside the energy storage valve includes: determining a current change rate according to the electrical parameter; If the current change speed is greater than or equal to a preset change speed threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

14. The method according to claim 11, wherein The energy storage valve further includes: a second electrical parameter detection circuit connected to the energy storage valve main line, wherein the other end of the second electrical parameter detection circuit is connected to the busbar; and determining whether a short circuit to ground occurs inside the energy storage valve based on the electrical parameter includes: determining an electrical parameter difference between an electrical parameter detected by the second electrical parameter detection circuit and an electrical parameter detected by the first electrical parameter detection circuit; If the electrical parameter difference is greater than or equal to a preset electrical parameter difference threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

15. The method according to any one of claims 11 to 14, wherein The method further comprises: If it is determined that a short circuit to ground occurs inside the energy storage valve, the energy storage valve is controlled to switch to a locked state.

16. A control device for an energy storage valve, wherein: The energy storage valve is an energy storage valve according to any one of claims 1 to 11, and the device comprises: an acquisition module, configured to acquire an electrical parameter detected by a first electrical parameter detection circuit in the energy storage valve; A determination module is used to determine whether a short circuit to ground occurs inside the energy storage valve according to the electrical parameters.

17. An energy storage device, wherein: The energy storage device comprises: an energy storage valve according to any one of claims 1 to 11.

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