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

Abstract

The present application relates to an energy storage valve, an energy storage valve control method and device, and an energy storage device. The energy storage valve can comprise detection branches and at least two energy storage modules that can be connected in series on a main line of the energy storage valve. One end of the main line of the energy storage valve can be connected to a positive electrode direct-current bus, and the other end of the main line of the energy storage valve can be connected to a negative electrode direct-current bus. At least one end of each detection branch can be connected to at least one target ground point, and the other end of said detection branch is connected to the ground, wherein the at least one target ground point includes: a first target ground point located between any two energy storage modules on the main line of the energy storage valve, or second target ground point located on the positive electrode direct-current bus, and a third target ground point located on the negative electrode direct-current bus. In the embodiments of the present application, whether a short to ground occurs inside an energy storage valve can be monitored in a timely manner, thereby facilitating the protection of 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. 2024101772741 filed on February 8, 2024, entitled “Energy Storage Valve, Control Method, Control Device and Energy Storage Device for Energy Storage Valve”, 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 situation of short-circuit to the ground inside the energy storage valve.

[0007] In a first aspect, the present application provides an energy storage valve, comprising a detection branch and at least two energy storage modules that can be connected in series to a main circuit of the energy storage valve; wherein one end of the main circuit of the energy storage valve is connected to a positive DC bus, and the other end of the main circuit of the energy storage valve is connected to a negative DC bus;

[0008] At least one end of the detection branch is connected to at least one target grounding point, and the other end of the detection branch is connected to the ground;

[0009] The at least one target grounding point includes: a first target grounding point located between any two energy storage modules on the energy storage valve trunk line, or a second target grounding point located on the positive DC bus and a third target grounding point located on the negative DC bus.

[0010] In the technical solution of the embodiment of the present application, by setting a detection branch between the target grounding point and the ground, it is possible to monitor the electrical parameters on the grounding branch between the target grounding point of the energy storage valve and the ground, and then timely monitor whether a short circuit to the ground occurs inside the energy storage valve, so that short-circuit protection can be performed in time when a short circuit to the ground is detected inside the energy storage valve, which is beneficial to protecting the energy storage valve.

[0011] In some embodiments, the detection branch includes a connected current limiting circuit and a first electrical parameter detection circuit that can be used to detect electrical parameters in the circuit;

[0012] Wherein, one end of the current limiting circuit is connected to the first target grounding point of the energy storage valve, and the other end of the current limiting circuit is connected to the ground through the first electrical parameter detection circuit; or,

[0013] One end of the first electrical parameter detection circuit is connected to the first target grounding point of the energy storage valve, and the other end of the first electrical parameter detection circuit is connected to the ground through the current limiting circuit.

[0014] In the technical solutions of the embodiments of the present application, on the one hand, by providing a current-limiting circuit between the first target grounding point and the ground, the fault current in the event of a short circuit to ground within the energy storage valve can be limited, thereby minimizing the damage to the energy storage valve caused by the fault current, thereby facilitating protection of the energy storage valve. On the other hand, by providing a first electrical parameter detection circuit between the first target grounding point and the ground, the electrical parameters of the grounding branch between the first target grounding point and the ground of the energy storage valve can be detected, thereby enabling timely monitoring of whether a short circuit to ground has occurred within the energy storage valve. This allows for timely short-circuit protection to be implemented if a short circuit to ground is detected within the energy storage valve, thereby further facilitating protection of the energy storage valve.

[0015] In some embodiments, a first portion of the at least two energy storage modules are located on one side of the first target grounding point, and a second portion of the at least two energy storage modules are located on the other side of the first target grounding point.

[0016] 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 detected in time by the first electrical parameter detection circuit, so that short-circuit protection can be performed in time, thereby minimizing the expansion of the fault.

[0017] 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 first target 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.

[0018] In some embodiments, the current limiting circuit includes a current limiting unit arranged between the first target grounding point and the ground, which can limit the fault current when a short circuit to ground occurs inside the energy storage valve, so as to alleviate the damage caused by the fault current to the energy storage valve as much as possible, thereby facilitating the protection of the energy storage valve.

[0019] In some embodiments, the current limiting unit includes a first resistor, or a second resistor and a reactor connected in series.

[0020] In some embodiments, the detection branch includes a connected voltage stabilization circuit and a second electrical parameter detection circuit that can be used to detect electrical parameters in the circuit;

[0021] The first end of the voltage stabilizing circuit is connected to the second target ground point, the second end of the voltage stabilizing circuit is connected to the third target ground point, and the third end of the voltage stabilizing circuit is connected to the ground via the second electrical parameter detection circuit.

[0022] In the technical solution of the embodiment of the present application, on the one hand, by providing a voltage stabilizing circuit between the second target grounding point and the third target grounding point and the ground, the positive and negative DC bus voltages can be clamped to a preset voltage, which is beneficial to improving the stability of the output voltage of the DC direct-hung energy storage valve. On the other hand, by providing a second electrical parameter detection circuit, the electrical parameters of the grounding branch between the second target grounding point and the ground, and between the third target grounding point and the ground of the energy storage valve can be detected, thereby timely monitoring whether a short circuit to ground occurs within the energy storage valve. In this way, short-circuit protection can be promptly implemented in the event of a short circuit to ground within the energy storage valve, thereby beneficially protecting the energy storage valve.

[0023] In some embodiments, the voltage stabilization circuit includes: a third resistor and a fourth resistor connected in series;

[0024] One end of the third resistor is connected to the second target ground point, one end of the fourth resistor is connected to the third target ground point, and the other ends of the third resistor and the fourth resistor are both connected to the ground through the second electrical parameter detection circuit.

[0025] In the technical solution of the embodiment of the present application, the third resistor and the fourth resistor can not only be used to clamp the positive and negative DC bus voltages to a preset voltage, but also be used to limit the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve.

[0026] In some embodiments, the voltage stabilizing circuit further includes a fifth resistor; wherein one end of the fifth resistor is respectively connected to the third resistor, the fourth resistor and one end of the second electrical parameter detection circuit, and the other end of the fifth resistor is respectively connected to the other end of the second electrical parameter detection circuit and the ground.

[0027] In some embodiments, the energy storage valve further comprises: a control device connected to the at least two energy storage modules and the detection branch;

[0028] 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 detection branch, 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.

[0029] 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:

[0030] Obtaining electrical parameters detected by a detection branch in the energy storage valve;

[0031] Determine whether a short circuit to ground occurs inside the energy storage valve based on electrical parameters.

[0032] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters includes:

[0033] If the electrical parameter is greater than or equal to the preset electrical parameter threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0034] In some embodiments, the preset electrical parameter threshold may include but is not limited to a preset current threshold or a preset voltage threshold.

[0035] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters includes:

[0036] Determine the current conversion speed based on electrical parameters;

[0037] If the current conversion speed is greater than or equal to the preset conversion speed threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0038] In some embodiments, the method further comprises:

[0039] 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.

[0040] 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:

[0041] An acquisition module, used to acquire electrical parameters detected by a detection branch in the energy storage valve;

[0042] The determination module is used to determine whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters.

[0043] 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.

[0044] 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

[0045] 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:

[0046] FIG1 is a schematic structural diagram of an energy storage valve provided in some embodiments of the present application;

[0047] FIG2 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application;

[0048] FIG3 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application;

[0049] FIG4 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0050] FIG5 is a schematic structural diagram of an energy storage valve provided in some other embodiments of the present application;

[0051] FIG6 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0052] FIG7 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0053] FIG8 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application;

[0054] FIG9 is a schematic flow chart of a method for controlling an energy storage valve according to some embodiments of the present application;

[0055] FIG10 is a schematic structural diagram of a control device for an energy storage valve provided in some embodiments of the present application. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] In order to solve the problem that the short-circuit protection method in the related art cannot be applied to the situation of a short circuit to ground inside the energy storage valve, the embodiment of the present application proposes to set a detection branch between the target grounding point of the energy storage valve and the ground, so as to monitor the electrical parameters on the grounding branch between the target grounding point of the energy storage valve and the ground, and then timely monitor whether a short circuit to ground occurs inside the energy storage valve, so that short-circuit protection can be performed in time when a short circuit to ground is detected inside the energy storage valve, thereby facilitating the protection of the energy storage valve.

[0064] 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: a detection branch 10 and at least two energy storage modules 12 that can be connected in series to the energy storage valve main line 11.

[0065] It should be noted that the connection between any two circuits or any two locations involved in the embodiments of the present application may include a direct connection or an indirect connection.

[0066] In the embodiment of the present application, one end of the energy storage valve trunk line 11 can be connected to the positive DC bus, and the other end of the energy storage valve trunk line 11 can be connected to the negative DC bus. For example, the two ends of the energy storage valve trunk line 11 can be connected to the positive and negative busbars respectively through corresponding positive and negative reactors, or can be connected to the positive and negative busbars through other methods.

[0067] The energy storage module 12 in the embodiment of the present application can be used to store or release electrical energy. Exemplarily, the energy storage module 12 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 12 during operation. The switching state of the energy storage module 12 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 12 is in the on-state, the energy storage module 12 is in a state of being connected in series with the energy storage valve main line 11; when the energy storage module 12 is in the off-state, the energy storage module 12 is in a state of being bypassed.

[0069] At least one end of the detection branch 10 in the embodiment of the present application can be connected to at least one target grounding point respectively, and the other end of the detection branch 10 can be connected to the ground. The detection branch 10 can be used to monitor the electrical parameters (or simply referred to as electrical parameters) on the grounding branch between at least one target grounding point of the energy storage valve and the ground, so that it can be timely monitored whether a short circuit to the ground occurs inside the energy storage valve, and then when a short circuit to the ground is detected inside the energy storage valve, short-circuit protection can be performed in time and the fault can be eliminated, which is conducive to ensuring the normal operation of the energy storage valve. For example, the electrical parameters in the embodiment of the present application may include but are not limited to current and / or voltage.

[0070] Illustratively, the at least one target grounding point in the embodiment of the present application may include: a first target grounding point GP1 located between any two energy storage modules 12 on the energy storage valve trunk line 11 .

[0071] As another example, the at least one target grounding point GP in the embodiment of the present application may include: a second target grounding point GP2 located on the positive DC bus and a third target grounding point GP3 ​​located on the negative DC bus.

[0072] It should be understood that, when the energy storage valve includes one target grounding point GP, one end of the detection branch 10 can be connected to the target grounding point GP of the energy storage valve, and the other end of the detection branch 10 can be connected to the ground. When the energy storage valve includes two target grounding points GP, the first end of the detection branch 10 can be connected to one target grounding point GP, the second end of the detection branch 10 can be connected to the other target grounding point GP, and the third end of the detection branch 10 can be connected to the ground.

[0073] In summary, the energy storage valve of the embodiment of the present application may include a detection branch and at least two energy storage modules that can be connected in series to the energy storage valve main circuit. One end of the energy storage valve main circuit can be connected to the positive DC bus, and the other end of the energy storage valve main circuit can be connected to the negative DC bus. At least one end of the detection branch can be connected to at least one target grounding point, and the other end of the detection branch can be connected to the ground. The at least one target grounding point includes: a first target grounding point located between any two energy storage modules on the energy storage valve main circuit, or a second target grounding point located on the positive DC bus and a third target grounding point located on the negative DC bus. It can be seen that in the embodiment of the present application, by providing a detection branch between the target grounding point and the ground, it is possible to monitor the electrical parameters of the grounding branch between the target grounding point of the energy storage valve and the ground, thereby timely monitoring whether a short circuit to ground occurs inside the energy storage valve. This allows for timely short-circuit protection when a short circuit to ground is detected inside the energy storage valve, thereby facilitating protection of the energy storage valve.

[0074] In some embodiments, based on the above embodiments, the present invention provides an exemplary description of the detection branch in the case where at least one target grounding point GP includes a first target grounding point GP1 located between any two energy storage modules 12 on the energy storage valve trunk line 11. FIG2 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present invention. As shown in FIG2, the detection branch 10 in the embodiments of the present invention may include a connected current limiting circuit 100 and a first electrical parameter detection circuit 101 that can be used to detect electrical parameters in the circuit.

[0075] The current limiting circuit 100 in the embodiment of the present application can be used to limit 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.

[0076] Exemplarily, the first electrical parameter detection circuit 101 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 transformer or a Hall sensor.

[0077] As shown in FIG2 , one end of the current limiting circuit 100 in the embodiment of the present application can be connected to the first target grounding point GP1 of the energy storage valve, and the other end of the current limiting circuit 100 can be connected to the ground via the first electrical parameter detection circuit 101. Of course, the positions of the current limiting circuit 100 and the first electrical parameter detection circuit 101 can be interchanged, that is, one end of the first electrical parameter detection circuit 101 can be connected to the first target grounding point GP1 of the energy storage valve, and the other end of the first electrical parameter detection circuit 101 can be connected to the ground via the current limiting circuit 100.

[0078] For example, a first portion of the at least two energy storage modules 12 on the energy storage valve trunk line 11 may be located on one side of the first target grounding point GP1 , and a second portion of the at least two energy storage modules 12 may be located on the other side of the first target grounding point GP1 .

[0079] In the embodiment of the present application, the energy storage valve is grounded at the midpoint of the energy storage valve main line 11, 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 promptly detected by the first electrical parameter detection circuit, so that short-circuit protection can be performed in time, thereby minimizing the expansion of the fault.

[0080] Furthermore, 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 first target grounding point GP1 can be less than the preset difference, which is conducive to further improving the stability of the bus voltage of the energy storage valve.

[0081] In summary, in the embodiments of the present application, by providing a current limiting circuit 100 between the first target grounding point GP1 and the ground, the fault current in the event of a short circuit to ground occurring within the energy storage valve can be limited, thereby minimizing the damage to the energy storage valve caused by the fault current, thereby facilitating protection of the energy storage valve. Furthermore, by providing a first electrical parameter detection circuit 101 between the first target grounding point GP1 and the ground, the electrical parameters of the grounding branch between the first target grounding point GP1 and the ground of the energy storage valve can be detected, thereby enabling timely monitoring of whether a short circuit to ground has occurred within the energy storage valve. This allows for timely short-circuit protection to be implemented if a short circuit to ground is detected within the energy storage valve, thereby further facilitating protection of the energy storage valve.

[0082] In some embodiments, based on the above embodiments, the relevant contents of the current limiting circuit 100 are exemplarily introduced and explained in the embodiments of the present application. Figure 3 is a structural schematic diagram of the energy storage valve provided in other embodiments of the present application. As shown in Figure 3, the current limiting circuit 100 of the embodiment of the present application may include a current limiting unit 1001 arranged between the first target grounding point GP1 and the ground. Among them, a first electrical parameter detection circuit 101 is also provided between the first target grounding point GP1 and the ground, so that the electrical parameters on the grounding branch between the first target grounding point GP1 and the ground can be collected, so as to timely monitor whether a short circuit to the ground occurs inside the energy storage valve. It should be understood that the positions of the current limiting unit 1001 and the first electrical parameter detection circuit 101 on the grounding branch can be interchanged.

[0083] Illustratively, the current limiting unit 1001 in the embodiment of the present application 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 limit the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve.

[0084] In the embodiment of the present application, by providing a current limiting unit on the grounding branch between the first target grounding point and the ground, the fault current when a short circuit to ground 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.

[0085] For example, the current limiting unit in the embodiment of the present application may include but is not limited to a first resistor, or the current limiting unit in the embodiment of the present application may include but is not limited to a second resistor and a reactor connected in series. The first resistor or the second resistor may be used to limit the magnitude of the fault current when a short circuit to ground occurs within the energy storage valve, and the reactor may be used to limit the rate of rise of the fault current when a short circuit to ground occurs within the energy storage valve.

[0086] For example, FIG4 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application. As shown in FIG4 , the current limiting unit 1001 in the embodiment of the present application may include a first resistor R1. It should be understood that the positions of the first resistor R1 and the first electrical parameter detection circuit 101 on the ground branch can be interchangeable.

[0087] It should be understood that in the embodiment of the present application, one end of the energy storage valve trunk line 11 can be connected to the positive DC bus through the positive inductor Lp, and the other end of the energy storage valve trunk line 11 can be connected to the negative DC bus through the negative inductor Ln. Of course, the two ends of the energy storage valve trunk line 11 can also be connected to the positive and negative DC busbars through other methods.

[0088] In the embodiment of the present application, by providing a first resistor R1 on the grounding branch between the first target grounding point and the ground, the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, thereby facilitating protection of the energy storage valve.

[0089] For example, FIG5 is a schematic structural diagram of an energy storage valve provided in other embodiments of the present application. As shown in FIG5 , the current limiting unit 1001 in the embodiment of the present application may include a second resistor R2 and a reactor L1. It should be understood that the positions of the second resistor R2, the reactor L1, and the first electrical parameter detection circuit 101 on the grounding branch can be interchanged.

[0090] In the embodiment of the present application, by providing the second resistor R2 and the reactor L1 on the grounding branch between the first target grounding point and the ground, not only the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, but also the rising speed of the fault current when a short circuit to ground occurs inside the energy storage valve can be limited, thereby facilitating further protection of the energy storage valve.

[0091] In some embodiments, based on the above embodiments, the relevant contents of the detection branch in the case where at least one target ground point GP in the embodiments of the present application can include a second target ground point GP2 located on the positive DC bus and a third target ground point GP3 ​​located on the negative DC bus are exemplarily introduced. Figure 6 is a schematic structural diagram of the energy storage valve provided in other embodiments of the present application. As shown in Figure 6, the detection branch 10 in the embodiments of the present application can include a connected voltage stabilizing circuit 102 and a second electrical parameter detection circuit 103 that can be used to detect electrical parameters in the circuit.

[0092] The voltage stabilizing circuit 102 in the embodiment of the present application can be used to clamp the positive and negative DC bus voltages to a preset voltage (e.g., ±35 kV), so that the output voltage of the DC direct-hung energy storage valve can be controlled at a target voltage (e.g., 70 kV).

[0093] Exemplarily, the second electrical parameter detection circuit 103 may include but is not limited to an electrical parameter detection sensor or an electrical parameter detection module.

[0094] The first end of the voltage stabilizing circuit 102 in the embodiment of the present application can be connected to the second target ground point GP2, the second end of the voltage stabilizing circuit 102 can be connected to the third target ground point GP3, and the third end of the voltage stabilizing circuit 102 can be connected to the ground through the second electrical parameter detection circuit 103, so that the second electrical parameter detection circuit 103 can detect the electrical parameters on the grounding branch between the second target ground point GP2 of the energy storage valve and the ground and between the third target ground point GP3 ​​and the ground.

[0095] In summary, in the embodiments of the present application, on the one hand, by providing a voltage stabilizing circuit 102 between the second target grounding point GP2 and the third target grounding point GP3 ​​and the ground, the positive and negative DC bus voltages can be clamped to a preset voltage, which is beneficial for improving the stability of the output voltage of the DC direct-hung energy storage valve. On the other hand, by providing a second electrical parameter detection circuit 103, the electrical parameters of the grounding branch between the second target grounding point GP2 and the ground, and between the third target grounding point GP3 ​​and the ground, can be detected. This allows for timely monitoring of whether a short circuit to ground occurs within the energy storage valve. This allows for timely short-circuit protection to be implemented if a short circuit to ground is detected within the energy storage valve, thereby facilitating protection of the energy storage valve.

[0096] In some embodiments, based on the above embodiments, the present application provides an exemplary introduction to the relevant contents of the voltage stabilizing circuit 102. FIG7 is a schematic diagram of the structure of the energy storage valve provided in other embodiments of the present application. As shown in FIG7, the voltage stabilizing circuit 102 in the embodiment of the present application may include, but is not limited to: a third resistor R3 and a fourth resistor R4 connected in series.

[0097] The third resistor R3 and the fourth resistor R4 in the embodiment of the present application can not only be used to clamp the positive and negative DC bus voltages to a preset voltage, but also be used to limit the magnitude of the fault current when a short circuit to ground occurs inside the energy storage valve.

[0098] In the embodiment of the present application, one end of the third resistor R3 can be connected to the second target ground point GP2, and one end of the fourth resistor R4 can be connected to the third target ground point GP3. The other ends of the third resistor R3 and the fourth resistor R4 are both connected to the ground through the second electrical parameter detection circuit 103, so that the electrical parameters on the grounding branch between the second target ground point GP2 and the ground and between the third target ground point GP3 ​​and the ground can be collected, thereby timely monitoring whether a short circuit to ground occurs inside the energy storage valve.

[0099] Furthermore, Figure 8 is a structural schematic diagram of the energy storage valve provided in other embodiments of the present application. As shown in Figure 8, the voltage stabilizing circuit 102 in the embodiment of the present application may further include a fifth resistor R5, so that the voltage across the fifth resistor R5 is collected by the second electrical parameter detection circuit to determine whether a fault occurs inside the energy storage valve.

[0100] Exemplarily, one end of the fifth resistor R5 may be connected to the third resistor R3 and the fourth resistor R4 respectively, the other end of the fifth resistor R5 is grounded, and the second electrical parameter detection circuit 103 is connected in parallel with the fifth resistor R5.

[0101] 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 12 and the detection branch 10, so as to obtain detected electrical parameters from the detection branch 10 and control the switching state of the energy storage module 12. Exemplarily, the electrical parameters detected by the detection branch 10 may include, but are not limited to, electrical parameters on the grounding branch between at least one target grounding point GP and the ground.

[0102] In the embodiment of the present application, during the operation of the energy storage valve, 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 detection branch 10. If a short circuit to ground occurs inside the energy storage valve, short-circuit protection can be promptly implemented and the fault can be eliminated, thereby facilitating the normal operation of the energy storage valve. The short-circuit protection in the embodiment of the present application may include, but is not limited to, controlling the energy storage valve to switch to a locked state.

[0103] In the following embodiments of the present application, an exemplary description is given of how to determine whether a short circuit to ground occurs inside the energy storage valve when the detection branch 10 includes a current limiting circuit 100 and a first electrical parameter detection circuit 101 .

[0104] Optionally, the control device can determine the current magnitude or current rising rate on the grounding branch between the corresponding target grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit 101, 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.

[0105] In one possible implementation, when the electrical parameter detected by the first electrical parameter detection circuit 101 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 101 with a preset current threshold.

[0106] For example, the preset current threshold may include, but is not limited to, the product of a first preset safety factor and a preset current. The first preset safety factor may include, but is not limited to, any value between 0 and 1; and the preset current may include, but is not limited to, a preset fault point current or a preset rated current.

[0107] The preset fault point current in the embodiment of the present application may include, but is not limited to, the current flowing through the fault point when any energy storage module close to the first target grounding point on the energy storage valve main line is short-circuited to ground.

[0108] The preset rated current in the embodiment of the present application may include but is not limited to the current on the grounding branch when any energy storage branch on the energy storage valve main line is short-circuited to the ground.

[0109] Furthermore, if the electrical parameter detected by the first electrical parameter detection circuit 101 is greater than or equal to a preset current threshold, the control device may deem that at least one energy storage branch on the energy storage valve main line has a short circuit to ground, thereby determining that a short circuit to ground has occurred inside the energy storage valve.

[0110] It should be understood that if the electrical parameter detected by the first electrical parameter detection circuit 101 is less than the preset current threshold, the control device can assume that none of the energy storage branches 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.

[0111] It should be noted that when the electrical parameters detected by the first electrical parameter detection circuit 101 include non-current parameters, the control device can determine the current on the grounding branch between the corresponding target grounding point and the ground based on the electrical parameters detected by the first electrical parameter detection circuit 101, and then determine whether a short circuit to ground occurs inside the energy storage valve based on the current on the grounding branch between the corresponding target grounding point and the ground.

[0112] It can be seen that in the embodiment of the present application, since the electrical parameters detected by the first electrical parameter detection circuit 101 can accurately indicate the electrical parameters on the grounding branch between the corresponding target 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 101 with the preset voltage threshold, it can be accurately determined whether a short circuit to ground occurs inside the energy storage valve.

[0113] In another possible implementation, the control device can determine the current conversion speed based on the electrical parameters detected by the first electrical parameter detection circuit 101, and determine whether a short circuit to ground occurs inside the energy storage valve by comparing the current change speed with a preset conversion speed threshold.

[0114] For example, the preset conversion speed threshold may include, but is not limited to, the product of a third preset safety factor and a preset fault point current conversion speed. The third preset safety factor may include, but is not limited to, any value between 0 and 1; and the preset fault point current conversion speed may include, but is not limited to, the current conversion speed flowing through the fault point when a short circuit to ground occurs in any energy storage module near the first target grounding point on the energy storage valve trunk line.

[0115] The preset fault point current conversion speed in the embodiment of the present application may include but is not limited to the ratio of the voltage of any energy storage branch close to the first target grounding point on the energy storage valve main line to the grounding inductance of the grounding branch.

[0116] Furthermore, if the current conversion speed is greater than or equal to a preset conversion speed threshold, the control device may deem that at least one energy storage branch connected to the energy storage valve main line has a short circuit to ground, thereby determining that a short circuit to ground has occurred inside the energy storage valve.

[0117] It should be understood that if the current conversion speed is less than the preset conversion speed threshold, the control device can assume that none of the energy storage branches 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.

[0118] It can be seen that in the embodiment of the present application, the electrical parameters detected by the first electrical parameter detection circuit 101 can accurately indicate the electrical parameters on the grounding branch between the corresponding target grounding point and the ground when a short circuit to ground occurs inside the energy storage valve. Therefore, the current conversion speed determined based on the electrical parameters can accurately indicate the current conversion speed on the grounding branch between the corresponding target grounding point and the ground. By comparing the current conversion speed with the preset conversion speed threshold, it can be accurately determined whether a short circuit to ground occurs inside the energy storage valve.

[0119] 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 first electrical parameter detection circuit 101 .

[0120] In the following embodiments of the present application, an exemplary description is given of how to determine whether a short circuit to ground occurs inside the energy storage valve when the detection branch 10 includes a voltage stabilizing circuit 102 and a second electrical parameter detection circuit 103 .

[0121] Optionally, the control device can determine the voltage on the grounding branch between the corresponding target grounding point and the ground based on the electrical parameters detected by the second electrical parameter detection circuit 103, and then determine whether a short circuit to ground occurs inside the energy storage valve based on the voltage on the grounding branch.

[0122] In one possible implementation, when the electrical parameter detected by the second electrical parameter detection circuit 103 includes voltage, 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 second electrical parameter detection circuit 103 with a preset voltage threshold.

[0123] For example, the preset voltage threshold may include, but is not limited to, the product of a fourth preset safety factor and a preset rated voltage, wherein the fourth preset safety factor may include, but is not limited to, any value between 0 and 1.

[0124] The preset rated voltage in the embodiment of the present application may include but is not limited to the voltage generated by the current in the grounding branch when any energy storage branch on the energy storage valve main line is short-circuited to the ground.

[0125] Furthermore, if the electrical parameter detected by the second electrical parameter detection circuit 103 is greater than or equal to a preset voltage threshold, the control device may deem that at least one energy storage branch on the energy storage valve main line has a short circuit to ground, thereby determining that a short circuit to ground has occurred inside the energy storage valve.

[0126] It should be understood that if the electrical parameter detected by the second electrical parameter detection circuit 103 is less than the preset voltage threshold, the control device can assume that none of the energy storage branches 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.

[0127] It should be noted that when the electrical parameters detected by the second electrical parameter detection circuit 103 include non-voltage parameters, the control device can determine the voltage on the grounding branch between the corresponding target grounding point and the ground based on the electrical parameters detected by the second electrical parameter detection circuit 103, and then determine whether a short circuit to ground occurs inside the energy storage valve based on the voltage on the grounding branch between the corresponding target grounding point and the ground.

[0128] It can be seen that in the embodiment of the present application, since the electrical parameters detected by the second electrical parameter detection circuit 103 can accurately indicate the electrical parameters on the grounding branch between the corresponding target 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 second electrical parameter detection circuit 103 with the preset voltage threshold, it can be accurately determined whether a short circuit to ground occurs inside the energy storage valve.

[0129] 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 second electrical parameter detection circuit 103 .

[0130] In some embodiments, FIG9 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 FIG9 , the method in the embodiments of the present application may include the following steps:

[0131] Step S901: obtaining electrical parameters detected by a detection branch in the energy storage valve;

[0132] Step S902: Determine whether a short circuit to ground occurs inside the energy storage valve according to the electrical parameters.

[0133] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters includes:

[0134] If the electrical parameter is greater than or equal to the preset electrical parameter threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0135] In some embodiments, determining whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters includes:

[0136] Determine the current conversion speed based on electrical parameters;

[0137] If the current conversion speed is greater than or equal to the preset conversion speed threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0138] In some embodiments, the method further comprises:

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] In some embodiments, Figure 10 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 an energy storage valve provided in the embodiments of the present application can be applied to a control device for an energy storage valve. As shown in Figure 10, the control device for an energy storage valve in the embodiments of the present application may include: an acquisition module 1001 and a determination module 1002.

[0144] The acquisition module 1001 is used to obtain the electrical parameters detected by the detection branch in the energy storage valve;

[0145] The determination module 1002 is configured to determine whether a short circuit to ground occurs inside the energy storage valve according to electrical parameters.

[0146] In some embodiments, the determination module 1002 is specifically configured to:

[0147] If the electrical parameter is greater than or equal to the preset electrical parameter threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0148] In some embodiments, the determination module 1002 is specifically configured to:

[0149] Determine the current conversion speed based on electrical parameters;

[0150] If the current conversion speed is greater than or equal to the preset conversion speed threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

[0151] In some embodiments, the control device of the energy storage valve of the embodiment of the present application may further include:

[0152] 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.

[0153] 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.

[0154] 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.

[0155] In some embodiments, a control device for an energy storage valve 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.

[0156] 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.

[0157] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. 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.

[0158] 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 includes a detection branch and at least two energy storage modules that can be connected in series to the energy storage valve main circuit; wherein one end of the energy storage valve main circuit is connected to the positive DC bus, and the other end of the energy storage valve main circuit is connected to the negative DC bus; At least one end of the detection branch is connected to at least one target grounding point, and the other end of the detection branch is connected to the ground; The at least one target grounding point includes: a first target grounding point located between any two energy storage modules on the energy storage valve trunk line, or a second target grounding point located on the positive DC bus and a third target grounding point located on the negative DC bus.

2. The energy storage valve according to claim 1, wherein: The detection branch includes a connected current limiting circuit and a first electrical parameter detection circuit that can be used to detect electrical parameters in the circuit; wherein one end of the current limiting circuit is connected to the first target grounding point of the energy storage valve, and the other end of the current limiting circuit is connected to the ground via the first electrical parameter detection circuit; or, One end of the first electrical parameter detection circuit is connected to the first target grounding point of the energy storage valve, and the other end of the first electrical parameter detection circuit is connected to the ground through the current limiting circuit.

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

4. The energy storage valve according to claim 3, 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.

5. The energy storage valve according to any one of claims 2 to 4, wherein: The current limiting circuit includes a current limiting unit arranged between the first target grounding point and the ground.

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

7. The energy storage valve according to claim 1, wherein: The detection branch includes a connected voltage stabilizing circuit and a second electrical parameter detection circuit that can be used to detect electrical parameters in the circuit; The first end of the voltage stabilizing circuit is connected to the second target ground point, the second end of the voltage stabilizing circuit is connected to the third target ground point, and the third end of the voltage stabilizing circuit is connected to the ground via the second electrical parameter detection circuit.

8. The energy storage valve according to claim 7, wherein: The voltage stabilizing circuit comprises: a third resistor and a fourth resistor connected in series; One end of the third resistor is connected to the second target ground point, one end of the fourth resistor is connected to the third target ground point, and the other ends of the third resistor and the fourth resistor are both connected to the ground through the second electrical parameter detection circuit.

9. The energy storage valve according to claim 8, wherein: The voltage stabilizing circuit also includes a fifth resistor; wherein, one end of the fifth resistor is respectively connected to the third resistor, the fourth resistor and one end of the second electrical parameter detection circuit, and the other end of the fifth resistor is respectively connected to the other end of the second electrical parameter detection circuit and the ground.

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 detection branch; 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 detection branch.

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 electrical parameters detected by a detection branch 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 electrical parameter 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 conversion speed according to the electrical parameters; If the current conversion speed is greater than or equal to a preset conversion speed threshold, it is determined that a short circuit to ground occurs inside the energy storage valve.

14. The method according to any one of claims 11 to 13, 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.

15. 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 10, and the device comprises: an acquisition module, configured to acquire electrical parameters detected by a detection branch 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.

16. An energy storage device, wherein: The energy storage device comprises: an energy storage valve according to any one of claims 1 to 10.

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