Energy storage valve operation control method and apparatus, energy storage valve sub-module, and energy storage system

Abstract

The present application relates to an energy storage valve operation control method and apparatus, an energy storage valve sub-module, an energy storage valve, and an energy storage system. The method comprises: when an energy storage valve sub-module in an energy storage valve is faulty, and if the bypass of the faulty energy storage valve sub-module fails, controlling the energy storage valve to lock first, such that the current of the energy storage valve is zero; further, by means of controlling a switch apparatus to open successfully, subjecting a capacitor of a power module to a high voltage, and changing the working state of a turn-off thyristor, such that the bypass of the faulty energy storage valve sub-module succeeds by means of the turn-off thyristor; and controlling the energy storage valve to exit locking and enter an operation state.

Description

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

[0001] This application refers to Chinese patent application No. 202311697609.4, filed on December 11, 2023, entitled “Energy storage valve operation control method, device, energy storage valve sub-module and energy storage system”, 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 operation control method and device, an energy storage valve submodule, an energy storage valve, and an energy storage system. Background Art

[0003] With the advancement of science and technology, energy storage systems, as a crucial resource for regulating power systems, are increasingly bringing significant convenience to people's daily lives and production. Among various energy storage systems, modular energy storage systems are gaining popularity due to their high degree of modularity, low network losses, and excellent economic benefits. Modular energy storage systems typically control the switching of individual energy storage valve submodules based on actual operating conditions. During this process, faulty energy storage valve submodules must be removed through bypass.

[0004] However, in the related art, when the bypass of the faulty energy storage valve submodule fails, the entire energy storage valve will stop operating, greatly reducing the operational reliability of the energy storage system.

[0005] Based on this, it is necessary to provide a storage valve operation control method, device, storage valve and energy storage system to reduce the possibility of bypass protection failure of a faulty energy storage valve submodule and improve the operation reliability of the energy storage system.

[0006] The present application provides a method for controlling the operation of an energy storage valve, comprising: controlling the energy storage valve to be locked when a faulty energy storage valve submodule exists in the energy storage valve and the faulty energy storage valve submodule fails to be bypassed; sending a tripping signal to a switch device of the faulty energy storage valve submodule; wherein a capacitor of a power module of the faulty energy storage valve submodule is connected to the energy storage module of the faulty energy storage valve submodule via the switch device; and controlling the operation of the energy storage valve when the switch device successfully trips and the faulty energy storage valve submodule is successfully bypassed via a turn-on thyristor; wherein the turn-on thyristor is connected in parallel with the bypass switch of the power module.

[0007] In the above-mentioned energy storage valve operation control method, a turning thyristor is arranged in parallel at the bypass switch of the power module of the energy storage valve submodule in the energy storage valve, and the power module is connected to the energy storage valve module through a switching device. In the event of a failure of the energy storage valve submodule in the energy storage valve, if the bypass of the faulty energy storage valve submodule fails, the energy storage valve is controlled to be locked first, so that the current of the energy storage valve is zero, and further by controlling the switch device to successfully open the gate, the capacitor of the power module is subjected to a high voltage, changing the working state of the turning thyristor, so that the faulty energy storage valve submodule is successfully bypassed through the turning thyristor, and the energy storage valve is controlled to exit the lock and enter the operating state. In the above-mentioned scheme, in the event that the bypass of the faulty energy storage valve submodule fails, the faulty energy storage valve submodule can be further bypassed through the turning thyristor to protect the faulty energy storage valve submodule, rather than directly shutting down the entire energy storage valve. In this way, the possibility of failure of bypass protection of the faulty energy storage valve submodule when a faulty energy storage valve submodule occurs can be greatly reduced, the phenomenon of overall shutdown of the energy storage valve can be alleviated, and the operational reliability of the energy storage system can be effectively improved.

[0008] In some embodiments, when the faulty energy storage valve submodule is successfully bypassed through the transition thyristor, the energy storage valve is controlled to operate, including: when the transition thyristor of the faulty energy storage valve submodule is passively broken down, the energy storage valve is controlled to operate.

[0009] The above solution increases the voltage across the turning thyristor by opening the switch device, thereby causing the turning thyristor to passively break down, causing the two ends of the turning thyristor to short-circuit, thereby realizing the bypass function of the faulty energy storage valve sub-module. It has the advantages of simple implementation and high bypass efficiency.

[0010] In some embodiments, the passive breakdown of the transition thyristor of the faulty energy storage valve submodule includes: when the switching device is open, obtaining voltage parameters across the transition thyristor of the faulty energy storage valve submodule; when the voltage parameter turns to zero within a preset time, determining that the transition thyristor has passively broken down; when the voltage parameter does not turn to zero within the preset time, determining that the transition thyristor has not passively broken down.

[0011] The above solution determines whether the transition thyristor has passive breakdown by detecting whether the voltage parameter across the transition thyristor turns to zero within a preset time period, and has high detection efficiency and detection accuracy.

[0012] In some embodiments, when there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, after controlling the energy storage valve to lock, the method further includes: if the energy storage valve is locked successfully, executing the step of sending a trip signal to the switching device of the faulty energy storage valve submodule; if the energy storage valve fails to lock, controlling the energy storage valve to stop operating.

[0013] In the above solution, after controlling the energy storage valve to be locked, it is necessary to further detect whether the energy storage valve is locked successfully. When the energy storage valve is locked successfully, the opening control of the switch device is executed to improve the opening reliability of the switch device.

[0014] In some embodiments, after sending a tripping signal to the switch device of the faulty energy storage valve submodule, the method further includes: if the switch device is successfully tripped and the faulty energy storage valve submodule is not successfully bypassed through the turning thyristor, controlling the energy storage valve to stop operating.

[0015] In the above scheme, when the switch device is successfully opened, the faulty energy storage valve submodule will be further tested to see whether it can be bypassed through the turning thyristor. If the bypass cannot be achieved through the turning thyristor, the energy storage valve will be controlled to stop operating, thereby reducing the possibility of further expansion of the energy storage valve fault.

[0016] In some embodiments, after sending a tripping signal to the switch device of the faulty energy storage valve submodule, the method further includes: controlling the energy storage valve to stop operating if the switch device fails to trip.

[0017] The above solution directly controls the energy storage valve to stop operating when the switch device fails to open, thereby reducing the possibility of further expansion of the energy storage valve failure.

[0018] In some embodiments, when there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, the energy storage valve is controlled to be locked, including: when there is a faulty energy storage valve submodule in the energy storage valve, controlling the power switch device connected in parallel with the bypass switch in the power module of the faulty energy storage valve submodule to be turned on; when the power switch device fails to be turned on, controlling the bypass switch to be closed; when the bypass switch fails to be closed, controlling the energy storage valve to be locked.

[0019] In the above solution, if a fault occurs in the energy storage valve submodule, the power switch connected in parallel with the bypass switch is first controlled to conduct to bypass the faulty energy storage valve submodule. If conduction fails, the bypass switch is controlled to close to bypass the faulty energy storage valve submodule. If the bypass switch also fails to bypass, the thyristor is activated to bypass the faulty energy storage valve submodule. This provides multi-level bypass protection for the energy storage valve submodule and improves the bypass success rate of the energy storage valve submodule.

[0020] The present application also provides an energy storage valve operation control device, comprising: an operation control module, used to control the energy storage valve to be locked when there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails; a trip control module, used to send a trip signal to the switching device of the faulty energy storage valve submodule; wherein the capacitor of the power module of the faulty energy storage valve submodule is connected to the energy storage module of the faulty energy storage valve submodule through the switching device; the operation control module is also used to control the operation of the energy storage valve when the switching device is successfully tripped, so that the faulty energy storage valve submodule is successfully bypassed through a turning thyristor; wherein the turning thyristor is connected in parallel with the bypass switch of the power module.

[0021] The present application also provides an energy storage valve submodule, including a controller, a power module, an energy storage module and a switching device. The power module includes a capacitor, a bypass switch, a turning thyristor, and a first power switching device and a second power switching device connected in series; the bypass switch is connected in parallel with the first power switching device, the turning thyristor is connected in parallel with the bypass switch, and the two ends of the turning thyristor are respectively cascaded with adjacent energy storage valve submodules. The end of the first power switching device away from the second power switching device is connected to the first end of the capacitor, and the end of the second power switching device away from the first power switching device is connected to the second end of the capacitor. The first end and the second end of the capacitor are respectively connected to the energy storage module through the switching device, and the first power switching device, the bypass switch and the switching device are respectively connected to the controller; the controller is used to control the switching device to open when the energy storage valve submodule fails and the faulty energy storage valve submodule fails to be bypassed, so that the faulty energy storage valve submodule is bypassed through the turning thyristor.

[0022] In the above-mentioned energy storage valve submodule, if a fault occurs in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, the energy storage valve is first controlled to close, reducing the current in the energy storage valve to zero. Furthermore, by successfully opening the switch device, the capacitor of the power module is subjected to a high voltage, changing the operating state of the transition thyristor, thereby successfully bypassing the faulty energy storage valve submodule through the transition thyristor. The energy storage valve is then controlled to exit the locked state and enter the operating state. In the above-mentioned solution, if the bypass of the faulty energy storage valve submodule fails, the transition thyristor can further bypass the faulty energy storage valve submodule, protecting the energy storage valve submodule and improving the operational safety of the energy storage valve submodule.

[0023] In some embodiments, the switching device includes a driving component, a first switching component and a second switching component, the driving component is connected to the first switching component and the second switching component respectively, the first end of the capacitor is connected to the energy storage module through the first switching component, and the second end of the capacitor is connected to the energy storage module through the second switching component.

[0024] In the above solution, a dual-switch type switch device is provided between the power module and the energy storage module, thereby achieving reliable isolation between the power module and the energy storage module and effectively reducing the cost of implementing bypass protection of the energy storage valve submodule.

[0025] The present application also provides an energy storage valve, comprising an energy storage valve control device and the above-mentioned energy storage valve sub-modules in cascade, wherein the controllers of the respective energy storage valve sub-modules are respectively connected to the energy storage valve control device.

[0026] The present application also provides an energy storage system, comprising a converter valve and the above-mentioned energy storage valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the drawings without inventive work. In the drawings:

[0028] FIG1 is a schematic diagram of the structure of an energy storage valve submodule in some embodiments of the present application;

[0029] FIG2 is a flow chart of a method for controlling the operation of an energy storage valve in some embodiments of the present application;

[0030] FIG3 is a flow chart of a method for controlling the operation of an energy storage valve in some other embodiments of the present application;

[0031] FIG4 is a flow chart of a method for controlling the operation of an energy storage valve in some other embodiments of the present application;

[0032] FIG5 is a schematic diagram of a storage valve locking control flow chart in some embodiments of the present application;

[0033] FIG6 is a schematic diagram of the energy storage valve locking control process in some other embodiments of the present application;

[0034] FIG7 is a flow chart of a method for controlling the operation of an energy storage valve in some further embodiments of the present application;

[0035] FIG8 is a schematic structural diagram of an energy storage valve operation control device in some embodiments of the present application.

[0036] Explanation of reference numerals: D-turn thyristor, K-bypass switch, T1-first power switching device, T2-first power switching device, C-capacitor, 101-power module, 103-switch device, 105-energy storage module. DETAILED DESCRIPTION

[0037] 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.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0044] Currently, market trends indicate that energy storage systems are becoming increasingly widespread, significantly improving electricity usage in daily production and life. Modular energy storage systems, with their highly modular structure, are able to meet the demands for high efficiency, reliability, cost-effectiveness, and safety, and are therefore gaining increasing adoption.

[0045] In a modular energy storage system, the energy storage valve is constructed using a modular cascade of energy storage valve submodules. Based on actual operational requirements, the energy storage valve submodules can be put into operation or shut down by an energy storage valve control device. Furthermore, while each energy storage valve submodule is in operation, continuous fault monitoring can be performed on each submodule. In the event of a failure in a submodule, the faulty energy storage valve submodule can be bypassed and protected by closing the bypass switch of the submodule or by turning on the power switch connected in parallel with the bypass switch.

[0046] However, due to the complex electrical environment in which the energy storage system operates, the bypass switch or power switch tube of the energy storage valve submodule often refuses to operate or fails to operate in actual operating scenarios. In this case, in order to alleviate the phenomenon that the continued operation of the faulty energy storage valve submodule may cause more serious failures or affect the reliable operation of the energy storage system, the energy storage valve in the faulty energy storage valve submodule is usually directly shut down. The current bypass protection method for faulty energy storage valve submodules has poor reliability, which can easily cause the energy storage system to be shut down unnecessarily due to the failure of the energy storage valve submodule, greatly reducing the operational reliability of the energy storage system.

[0047] To alleviate the above phenomenon, research has found that an additional level of bypass protection can be added to the energy storage valve submodule. When the bypass switch and the power switch tube in parallel with the bypass switch fail to bypass, the bypass function of the energy storage valve submodule can be realized through the newly added level of protection, thereby cutting off the faulty energy storage valve submodule for protection.

[0048] Based on the above considerations, combined with the electrical distribution of the energy storage valve sub-module in the actual operation scenario, a turning thyristor can be connected in parallel at the bypass switch. When the energy storage valve sub-module is not faulty, the turning thyristor will not affect the normal operation of the energy storage valve sub-module. In the event of a fault in the energy storage valve sub-module, the faulty energy storage valve sub-module can be bypassed through the turning thyristor by changing the working state of the turning thyristor.

[0049] Based on this, in the embodiment of the present application, a turn-on thyristor is provided in parallel at the bypass switch of the power module of the energy storage valve submodule, and the power module is connected to the energy storage valve module via a switch device. In the event of a failure of the energy storage valve submodule in the energy storage valve, if the faulty energy storage valve submodule fails to bypass, the energy storage valve is controlled to first lock, reducing the current of the energy storage valve to zero. Then, by controlling the switch device to successfully open, the capacitor of the power module is subjected to high voltage, changing the operating state of the turn-on thyristor, thereby successfully bypassing the faulty energy storage valve submodule through the turn-on thyristor, and controlling the energy storage valve to exit the lock state and enter the operating state.

[0050] With this solution, if bypass protection fails for a faulty energy storage valve submodule, the faulty energy storage valve submodule can be bypassed using a thyristor to protect it, rather than shutting down the entire energy storage valve. This significantly reduces the likelihood of bypass protection failure in the event of a faulty energy storage valve submodule, mitigates the risk of the entire energy storage valve shutting down, and effectively improves the operational reliability of the energy storage system.

[0051] The energy storage valve operation control method provided in the embodiment of the present application is applied to the energy storage valve of a modular energy storage system. The energy storage valve includes an energy storage valve control device and multiple cascaded energy storage valve sub-modules. Each energy storage valve sub-module is switched on and off under the control of the energy storage valve control device and its own sub-module control board. In addition, the energy storage valve control device can further control the energy storage valve to enter different operating states such as locking or shutdown.

[0052] With reference to FIG1 , each energy storage valve submodule in the energy storage valve includes a power module 101, an energy storage module 105, and a switch device 103. The power module 101 and the energy storage module 105 are connected via the switch device 103, and the two can be isolated by opening the switch device 103. The power module 101 further includes a power circuit, a bypass switch K, a thyristor D, and a capacitor C. The power circuit includes two power switches connected in series (i.e., T1 and T2 in the figure). The two ends of one power switch (T1) serve as the AC ends of the power circuit, and the bypass switch K and the thyristor D are sequentially connected in parallel at the AC ends. The two ends formed by the series connection of the two power switches serve as the DC ends of the power circuit, and the capacitor C is connected in parallel at the DC end. The two ends of the capacitor C are respectively connected to the energy storage module 105 via the switch device 103.

[0053] In some embodiments, the energy storage valve submodule also includes a submodule control board, a power switch drive board, and a bypass switch drive board. The submodule control board is respectively communicated with the energy storage valve control device, the power switch drive board, and the bypass switch drive board, thereby forming a control system to realize operational control such as switching on and off of the energy storage valve submodule.

[0054] It is understood that the modular energy storage system of the embodiments of the present application is not limited to a single type. In some embodiments, it can be a high-voltage direct current energy storage system. In other embodiments, it can be a medium- and low-voltage energy storage system, etc., without specific limitation. To facilitate understanding of the technical solution of the present application, the following embodiments are understood to be based on the application of the energy storage valve operation control method to a high-voltage direct current modular energy storage system.

[0055] Please refer to FIG. 2 . The present application provides a method for controlling the operation of an energy storage valve. The method includes step 202 , step 204 , and step 206 .

[0056] Step 202 : When there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, control the energy storage valve to be locked.

[0057] A storage valve is a device capable of storing and accessing electrical energy, formed by cascading multiple storage valve submodules. The storage valve submodule is the smallest modular unit in the system that enables electrical energy storage and access. A faulty storage valve submodule is one that has failed and needs to be disconnected for protection. Lockout is a state in which the current flowing through the valve is reduced to zero while maintaining a connection to the grid.

[0058] With reference to Figure 1 , the energy storage valve submodule of an embodiment of the present application includes a power module 101, an energy storage module 105, and a switching device 103. The power module 101 includes a capacitor C, a bypass switch K, a turning thyristor D, and a first power switch device T1 and a second power switch device T2 connected in series. The bypass switch K is connected in parallel with the first power switch device T1, and the turning thyristor D is connected in parallel with the bypass switch K. Both ends of the turning thyristor D are cascaded with adjacent energy storage valve submodules, respectively. An end of the first power switch device T1 away from the second power switch device T2 is connected to the first end of the capacitor C, and an end of the second power switch device T2 away from the first power switch device T1 is connected to the second end of the capacitor C. The first and second ends of the capacitor C are respectively connected to the energy storage module 105 through the switching device 103.

[0059] In the energy storage valve submodule of this structure, if the energy storage valve control device detects that a certain energy storage valve submodule has failed, it will first implement a bypass operation through the first power switch device and / or the bypass switch. If the bypass of the first power switch device and / or the bypass switch fails, it is considered that the bypass of the faulty energy storage valve submodule has failed. At this time, the energy storage valve will be locked, which can reduce the possibility of accidents caused by the continued operation of the energy storage valve.

[0060] It should be noted that the energy storage valve control device is not the only way to control the energy storage valve to lock. In some embodiments, the energy storage valve is locked by controlling related components in the energy storage valve to reduce the current of the energy storage valve to zero. In actual scenarios, the method of reducing the current of the energy storage valve to zero is not limited to specific methods, and can be achieved by controlling the operation of a circuit breaker or contactor between the energy storage valve and the AC busbar of the energy storage system.

[0061] Step 204: Send a trip signal to the switch device of the faulty energy storage valve submodule.

[0062] The capacitor of the power module of the faulty energy storage valve submodule is connected to the energy storage module of the faulty energy storage valve submodule through a switching device. The switching device is a switching device that is arranged in the junction cabinet between the power module of the energy storage valve and the energy storage valve module, and is used to isolate the power module and the energy storage module. In the solution of this embodiment, when the bypass switch and / or the power switch device in parallel with the bypass switch fail to bypass, the energy storage valve control device will control the energy storage valve to lock. At this time, the switching device meets the action conditions, and the energy storage valve control device will send a trip signal to the submodule control board of the faulty energy storage valve submodule. The submodule control board further transmits the trip signal to the switching device to control the switching device to trip, that is, to control the switching device to disconnect the connection between the energy storage module and the power module, so that the power module and the energy storage module are electrically isolated.

[0063] It should be noted that the specific type of switch device is not limited to a single type; any switch capable of disconnecting the power module and the energy storage module can be used. For example, in some embodiments, the switch device includes an isolating switch, that is, an isolating switch is provided between the power module and the energy storage module, and the isolation between the power module and the energy storage module is achieved by opening the isolating switch. In other embodiments, the switch device may also employ a solid-state circuit breaker, etc., without specific limitation.

[0064] Step 206 : When the switch device is opened successfully and the faulty energy storage valve submodule is bypassed successfully through the turning thyristor, the energy storage valve is controlled to operate.

[0065] The thyristor is connected in parallel with the bypass switch of the power module. The thyristor is also called a thyristor diode, also known as a reverse blocking two-terminal thyristor or Shockley diode. It is a unidirectional switching diode that can work in the forward switching direction. When the forward voltage reaches the rated value, it can achieve tumbling conduction.

[0066] In this embodiment, a thyristor is connected in parallel with both ends of the bypass switch. These ends can be considered the AC terminals of the energy storage valve submodule, cascaded with adjacent energy storage valve submodules. Therefore, by placing the thyristor in a specific operating state (equivalent to a short-circuit state), current can flow through the thyristor and avoid flowing to the downstream power switch, achieving the same bypass function as a bypass switch.

[0067] When the control switch device successfully opens, the voltage across the power module's capacitor rapidly increases and is applied to the transition thyristor, changing its operating state. Ultimately, the faulty energy storage valve submodule is successfully bypassed through the transition thyristor, and the faulty energy storage valve submodule is removed from the current energy storage valve. The faulty energy storage valve submodule has no effect on the energy storage valve, so the energy storage valve control device now controls the energy storage valve to exit the locked state and enter the operating state. Controlling the energy storage valve to operate in this case refers to controlling the energy storage valve to exit the locked state, allowing the energy storage valve to continue operating after the faulty energy storage valve submodule is removed.

[0068] In the above-mentioned energy storage valve operation control method, a turning thyristor is arranged in parallel at the bypass switch of the power module of the energy storage valve submodule in the energy storage valve, and the power module is connected to the energy storage valve module through a switching device. In the event of a failure of the energy storage valve submodule in the energy storage valve, if the bypass of the faulty energy storage valve submodule fails, the energy storage valve is controlled to be locked first, so that the current of the energy storage valve is zero, and further by controlling the switch device to successfully open the gate, the capacitor of the power module is subjected to a high voltage, changing the working state of the turning thyristor, so that the faulty energy storage valve submodule is successfully bypassed through the turning thyristor, and the energy storage valve is controlled to exit the lock and enter the operating state. In the above-mentioned scheme, in the event that the bypass of the faulty energy storage valve submodule fails, the faulty energy storage valve submodule can be further bypassed through the turning thyristor to protect the faulty energy storage valve submodule, rather than directly shutting down the entire energy storage valve. In this way, the possibility of failure of bypass protection of the faulty energy storage valve submodule when a faulty energy storage valve submodule occurs can be greatly reduced, the phenomenon of overall shutdown of the energy storage valve can be alleviated, and the operational reliability of the energy storage system can be effectively improved.

[0069] Please refer to FIG. 3 . In some embodiments, after step 204 , the method further includes step 302 .

[0070] Step 302 : When the switch device is opened successfully and the faulty energy storage valve submodule is not successfully bypassed through the turning thyristor, the energy storage valve is controlled to stop operating.

[0071] In this embodiment, after the switch device successfully opens, the energy storage valve control device also monitors the faulty energy storage valve submodule. In actual operation, due to capacitor failure, short circuit between the capacitor and the transition thyristor, or other reasons, even if the switch device successfully opens, the faulty energy storage valve submodule may not be bypassed through the transition thyristor. In this case, to improve the operational safety of the energy storage valve and reduce the risk of malfunctioning energy storage valve submodules, the energy storage valve control device will control the energy storage valve to stop operating.

[0072] In the above scheme, when the switch device is successfully opened, the faulty energy storage valve submodule will be further tested to see whether it can be bypassed through the turning thyristor. If the bypass cannot be achieved through the turning thyristor, the energy storage valve will be controlled to stop operating, thereby reducing the possibility of further expansion of the energy storage valve fault.

[0073] In some embodiments, when the faulty energy storage valve submodule is successfully bypassed through the transition thyristor, the energy storage valve is controlled to operate, including: when the transition thyristor of the faulty energy storage valve submodule is passively broken down, the energy storage valve is controlled to operate.

[0074] The solution of this embodiment is to bypass the faulty energy storage valve submodule through the turning thyristor by means of the passive breakdown of the turning thyristor. In another embodiment, the bypass function can also be achieved by controlling the turning thyristor to short-circuit the turning thyristor by failing to switch phase, and the specific details are not limited. The turning thyristor switching failure means that the turning thyristor cannot normally return to the off state in the forward conduction state, which is usually caused by reasons such as the off time of the switch being too long, the current being too large, and the voltage being too large. Therefore, the solution of this embodiment can also output corresponding pulses to control the switching of the turning thyristor when the switching device is successfully opened, causing the voltage across the turning thyristor to increase, thereby causing the turning thyristor to fail to switch phase and enter a short-circuit state.

[0075] With reference to FIG1 , in the solution of this embodiment, the switch device is successfully opened, the first power switch device cannot be normally turned on, and the second power switch device is controlled to be in the on state. The voltage across the capacitor increases rapidly and is applied to the transition thyristor, causing the voltage across the transition thyristor to increase rapidly. When the breakdown voltage of the transition thyristor is reached, the transition thyristor is broken down. At this time, the two ends of the transition thyristor can be regarded as being in a short-circuit state, so the energy storage valve submodule can be bypassed.

[0076] The above solution increases the voltage across the turning thyristor by opening the switch device, thereby causing the turning thyristor to passively break down, causing the two ends of the turning thyristor to short-circuit, thereby realizing the bypass function of the faulty energy storage valve sub-module. It has the advantages of simple implementation and high bypass efficiency.

[0077] In some embodiments, the passive breakdown of the transition thyristor of the faulty energy storage valve submodule includes: obtaining voltage parameters across the transition thyristor when the isolating switch is open; determining that the transition thyristor has passively broken down if the voltage parameter turns to zero within a preset time; and determining that the transition thyristor has not passively broken down if the voltage parameter does not turn to zero within the preset time.

[0078] When a thyristor breaks down, its two terminals are effectively short-circuited. This means there's no voltage drop across them, meaning the voltage across them is zero. Therefore, passive breakdown can be determined by measuring the voltage across the thyristor and determining whether it remains zero within a preset timeframe.

[0079] It is understood that in other embodiments, whether the transition thyristor has passive breakdown may be determined by monitoring the magnitude of the current flowing through the transition thyristor or monitoring the temperature of the transition thyristor, etc., which is not specifically limited.

[0080] It should be noted that there is no single method for obtaining the voltage parameters across the turnaround thyristor. In some embodiments, a voltage detection device, such as a voltage transformer, can be provided at both ends of the turnaround thyristor to collect the voltage across the turnaround thyristor and transmit it to the energy storage valve control device. The preset duration is not unique and can be set based on the actual operating scenario of the energy storage valve submodule so that the turnaround thyristor can complete breakdown within the preset duration. For example, in some embodiments, the preset duration can be set to less than or equal to 10ms (milliseconds).

[0081] The above solution determines whether the transition thyristor has passive breakdown by detecting whether the voltage parameter across the transition thyristor turns to zero within a preset time period, and has high detection efficiency and detection accuracy.

[0082] Please refer to FIG. 4 . In some embodiments, after step 204 , the method further includes step 402 .

[0083] Step 402: When the switch device fails to open, the energy storage valve is controlled to stop operating.

[0084] In this embodiment, even after the energy storage valve control device sends a trip signal to the switch device, the switch device may still fail to open according to the trip signal due to a communication failure, indicating that the switch device has failed to open. In this case, to improve the operational safety of the energy storage valve and reduce the risk of a faulty energy storage valve submodule, the energy storage valve control device will control the energy storage valve to stop operating.

[0085] Through the solution of this embodiment, a four-level protection measure is adopted to protect the faulty energy storage valve submodule: power switch conduction, bypass switch closing, transition thyristor breakdown, and energy storage valve shutdown. This reduces the possibility of the faulty energy storage valve submodule continuing to operate while minimizing the need to shut down the energy storage valve. Alternatively, a three-level protection measure can be adopted: power switch conduction, transition thyristor breakdown, and energy storage valve shutdown. Alternatively, a three-level protection measure can be adopted: bypass switch closing, transition thyristor breakdown, and energy storage valve shutdown. The choice of three-level protection measures can be adjusted based on actual needs.

[0086] The above solution directly controls the energy storage valve to stop operating when the switch device fails to open, thereby reducing the possibility of further expansion of the energy storage valve failure.

[0087] Referring to FIG. 5 , in some embodiments, step 202 includes step 502 , step 504 , and step 506 .

[0088] Step 502 : When there is a faulty energy storage valve submodule in the energy storage valve, control the power switch device connected in parallel with the bypass switch in the power module of the faulty energy storage valve submodule to be turned on.

[0089] Step 504: When the power switch fails to turn on, the bypass switch is controlled to close.

[0090] Step 506: When the bypass switch fails to close, the energy storage valve is controlled to be locked.

[0091] The solution of this embodiment is explained by taking as an example the case where the bypass failure of the failed energy storage valve submodule is considered to occur when both the power switch device connected in parallel with the bypass switch and the bypass switch fail to bypass (i.e., level 4 protection). In the event of a failure of the energy storage valve submodule, the power switch device connected in parallel with the bypass switch is first controlled. If the power switch device fails to conduct, the bypass switch is then controlled to close, thereby achieving control over the removal of the failed energy storage valve submodule. It is understood that in other embodiments, in the event of a failure of the energy storage valve submodule, the bypass switch may be first controlled to close. If the bypass switch fails to close, the power switch device connected in parallel with the bypass switch is then controlled to conduct, thereby achieving control over the removal of the failed energy storage valve submodule.

[0092] In the above solution, if a fault occurs in the energy storage valve submodule, the power switch connected in parallel with the bypass switch is first controlled to conduct to bypass the faulty energy storage valve submodule. If conduction fails, the bypass switch is controlled to close to bypass the faulty energy storage valve submodule. If the bypass switch also fails to bypass, the thyristor is activated to bypass the faulty energy storage valve submodule. This provides multi-level bypass protection for the energy storage valve submodule and improves the bypass success rate of the energy storage valve submodule.

[0093] Please refer to FIG. 6 . In some embodiments, after step 502 , the method further includes step 602 .

[0094] Step 602: When the power switch device is successfully turned on, the energy storage valve is controlled to operate.

[0095] If the energy storage valve submodule fails, the energy storage valve control device sends a conduction signal to the switch device connected in parallel with the bypass switch in the faulty energy storage valve submodule. It then monitors the conduction status of the power switch device in real time. If the power switch device conducts, the faulty energy storage valve submodule has been removed from the energy storage valve. If the power switch device fails to conduct, the faulty energy storage valve submodule remains connected to the energy storage valve and in operation. If the faulty energy storage valve submodule has been removed from the energy storage valve, it will not affect the operation of the energy storage valve. In this case, the only requirement is to control the operation of the energy storage valve, i.e., to maintain the operation of the energy storage valve in its current state.

[0096] In the above solution, if the power switch device of the faulty energy storage valve submodule is successfully turned on, the faulty energy storage valve submodule can be bypassed without the need to perform closing control of the bypass switch, thereby effectively improving the removal efficiency of the faulty energy storage valve submodule.

[0097] Please refer to FIG. 6 . In some embodiments, after step 504 , the method further includes step 604 .

[0098] Step 604: When the bypass switch is closed successfully, the energy storage valve is controlled to operate.

[0099] If the power switch connected in parallel with the bypass switch in the faulty energy storage valve submodule fails to conduct, the energy storage valve control device sends a closing signal to the bypass switch and monitors the open and closed status of the bypass switch in real time. If the bypass switch is closed, the faulty energy storage valve submodule has been removed from the energy storage valve; if the bypass switch is not closed, the faulty energy storage valve submodule is still connected to the energy storage valve and in operation. If the faulty energy storage valve submodule has been removed from the energy storage valve, it will not affect the operation of the energy storage valve. At this time, it is only necessary to control the operation of the energy storage valve, that is, to control the energy storage valve to maintain operation in its current state.

[0100] In the above solution, if the bypass switch of the faulty energy storage valve submodule is closed successfully, the faulty energy storage valve submodule can be bypassed without the need for opening control of the switch device, effectively improving the removal efficiency of the faulty energy storage valve submodule.

[0101] In some embodiments, controlling the power switch device connected in parallel with the bypass switch in the power module of the faulty energy storage valve submodule to be turned on includes: controlling the submodule control board and / or the power switch drive board of the faulty energy storage valve submodule to send a turn-on signal to the power switch device connected in parallel with the bypass switch.

[0102] In this embodiment, the energy storage valve submodule further includes a submodule control board, a power switch driver board, and a bypass switch driver board. The submodule control board is communicatively connected to the energy storage valve control device, and is configured to receive relevant control instructions from the energy storage valve control device and to provide operational information back to the energy storage valve control device. The power switch driver board and the bypass switch driver board are each communicatively connected to the submodule control board.

[0103] After the energy storage valve control device detects a fault in the energy storage valve submodule, it communicates with the submodule control board of the faulty energy storage valve submodule and issues a turn-on command to the submodule control board. The submodule control board can then further send the turn-on command to the power switch driver board. Upon receiving the turn-on command, the submodule control board directly generates a turn-on signal based on the turn-on command and sends it to the power switch device to control its conduction. The power switch driver board also generates a turn-on signal based on the turn-on command and sends it to the power switch device to control its conduction.

[0104] Therefore, in actual operation scenarios, the submodule control board can be selected to send a turn-on signal to the power switch device to control the power switch device to turn on; and / or the power switch driver board can be selected to send a turn-on signal to the power switch device to control the power switch device to turn on. In some embodiments, both the submodule control board and the power switch driver board send a turn-on signal to the power switch device, thereby achieving redundant turn-on control of the power switch device and improving the turn-on success rate of the power switch device.

[0105] It can be understood that both the sub-module control board and the power switch driver board send a turn-on signal to the power switch device. Specifically, the sub-module control board and the power switch driver board may send the turn-on signal at the same time; or the sub-module control board may send the turn-on signal first, and the power switch device may not be turned on before the power switch driver board sends the turn-on signal; or the power switch driver board may send the turn-on signal first, and the power switch device may not be turned on before the sub-module control board sends the turn-on signal. There is no specific limitation.

[0106] In the above solution, the power switch device can be turned on under the control of the submodule control board and / or the power switch driver board, effectively improving the success rate of the power switch device being turned on.

[0107] In some embodiments, controlling the bypass switch to close includes: controlling the submodule control board and / or the bypass switch drive board of the faulty energy storage valve submodule to send a closing signal to the bypass switch.

[0108] Similar to the conduction control of the power switch device in the above embodiment, the closing control of the bypass switch can also be issued by the submodule control board and / or the bypass switch driver board, and the selection can be made based on actual needs. In some embodiments, when both the submodule control board and the bypass switch driver board issue the conduction signal, they can also issue it simultaneously or sequentially, and the details will not be repeated here.

[0109] In the above solution, the bypass switch can be turned on under the control of the submodule control board and / or the bypass switch driver board, effectively improving the closing success rate of the bypass switch.

[0110] In some embodiments, referring to FIG. 7 , after step 202 , the method further includes step 702 .

[0111] Step 702: When the energy storage valve fails to lock, the energy storage valve is controlled to stop operating.

[0112] When the energy storage valve is locked successfully, step 204 is executed.

[0113] As shown above, locking the energy storage valve refers to reducing the current flowing through the energy storage valve to zero, thereby enabling the switching device to operate. In this embodiment, after controlling the energy storage valve to execute the locking action, the energy storage valve control device must monitor in real time whether the energy storage valve has been successfully locked. If the energy storage valve is successfully locked, the device further executes the step of sending a trip signal to the switching device of the faulty energy storage valve submodule. If the energy storage valve is not successfully locked, the device controls the energy storage valve to stop operating, reducing the possibility of further safety hazards caused by continued operation of the energy storage valve.

[0114] It is understood that the energy storage valve control device has more than one method for determining whether the energy storage valve is successfully locked. In some embodiments, a current detector may be provided on the energy storage valve, which is in communication with the energy storage valve control device. After the energy storage valve control device issues a locking control signal to the energy storage valve, the current detector receives the current value collected and sent by the current detector in real time. If the current value turns to zero within a certain period of time, the energy storage valve is considered to have been locked successfully. If the current value does not turn to zero within a certain period of time, the energy storage valve is considered to have failed to be locked. In other embodiments, other methods may be used to detect whether the energy storage valve is successfully locked, for example, detecting whether the output power of the energy storage valve is zero, etc., which are not specifically limited.

[0115] In the above solution, after controlling the energy storage valve to be locked, it is necessary to further detect whether the energy storage valve is locked successfully. When the energy storage valve is locked successfully, the opening control of the switch device is executed to improve the opening reliability of the switch device.

[0116] In order to facilitate understanding of the technical solution of the present application, the present application is explained below in conjunction with more detailed embodiments.

[0117] In each cascaded energy storage valve submodule, a thyristor is installed in parallel at the bypass switch. The power module and energy storage module are connected via a switch device. During operation of the energy storage valve connected to the energy storage system, the energy storage valve control device monitors each energy storage valve submodule for faults in real time. If a faulty energy storage valve submodule is detected, the energy storage valve control device first sends a turn-on instruction to the submodule control board of the faulty energy storage valve submodule, requesting the power switch device to turn on. The submodule control board then sends the turn-on instruction to the power switch driver board. The submodule control board and the power switch driver board then simultaneously send a turn-on signal to the power switch device connected in parallel with the bypass switch. The energy storage valve control device monitors whether the power switch device has successfully turned on based on the signal fed back by the submodule control board or the power switch driver board. If successful, this indicates that the faulty energy storage valve submodule has been bypassed for protection. At this point, the energy storage valve can be controlled to continue operating. If the turn-on is unsuccessful, the protection action for the next faulty energy storage valve submodule must be initiated.

[0118] Similarly, in this level of fault protection, the energy storage valve control device sends a closing instruction related to the bypass switch closing to the submodule control board of the faulty energy storage valve submodule. The submodule control board sends the closing instruction to the bypass switch driver board. Then, the submodule control board and the bypass switch driver board simultaneously send a closing signal to the bypass switch. The energy storage valve control device monitors whether the bypass switch device has closed successfully based on the signal feedback from the submodule control board or the power switch driver board. If closing is successful, it indicates that the faulty energy storage valve submodule has been bypassed for protection. At this time, the energy storage valve can be controlled to continue operating. If closing is not successful, it is necessary to control the energy storage valve to lock. Within a certain period of time after the lock-related signal is output, if the energy storage valve control device detects that the current across the energy storage valve has dropped to zero, it determines that the energy storage valve has been locked successfully and enters the protection action of the next level faulty energy storage valve submodule; if the energy storage valve control device detects that the current across the energy storage valve has not dropped to zero, it determines that the energy storage valve has failed to lock.

[0119] In the protection of the faulty energy storage valve submodule after the energy storage valve is successfully locked, the energy storage valve control device sends the relevant opening instructions for the switch device to the submodule control board of the faulty energy storage valve submodule. The submodule control board generates an opening signal according to the opening instruction and sends it to the switch device. After that, the energy storage valve control device monitors whether the switch device is successfully opened according to the information fed back by the submodule control board. If the switch device is successfully opened, it further monitors whether the turning thyristor is broken down (this can be achieved by monitoring the negative voltage or current of the turning thyristor). If the turning thyristor breaks down under the action of the voltage at both ends of the capacitor, it indicates that the faulty energy storage valve submodule has been bypassed for protection. At this time, the energy storage valve is controlled to end the lock and enter the operating state for continuous operation.

[0120] If the switch fails to open, or the thyristor fails to break down, the energy storage valve control device enters the final protection level. At this point, the energy storage valve control device stops the energy storage valve in the faulty energy storage valve submodule and waits until the fault is corrected before resuming operation. This reduces the risk of further fault expansion and improves the operational reliability of the energy storage valve.

[0121] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence 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 executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0122] Based on the same inventive concept, the present application also provides an energy storage valve operation control device for implementing the aforementioned energy storage valve operation control method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more energy storage valve operation control device embodiments provided below can be found in the above-mentioned limitations of the energy storage valve operation control method and will not be repeated here.

[0123] Please refer to FIG. 8 . The present application further provides an energy storage valve operation control device, including an operation control module 802 and a gate opening control module 804 .

[0124] The operation control module 802 is used to control the energy storage valve to be locked when there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails; the opening control module 804 is used to send an opening signal to the switching device of the faulty energy storage valve submodule; the operation control module 802 is also used to control the operation of the energy storage valve when the switching device is successfully opened and the faulty energy storage valve submodule is successfully bypassed through the turning thyristor.

[0125] In some embodiments, the operation control module 802 is further configured to control the energy storage valve to stop operating when the switch device fails to open.

[0126] In some embodiments, the operation control module 802 is further configured to control the energy storage valve to stop operating when the switch device is successfully opened and the faulty energy storage valve submodule is not successfully bypassed through the turning thyristor.

[0127] In some embodiments, the operation control module 802 is also used to control the power switch device connected in parallel with the bypass switch in the power module of the faulty energy storage valve submodule to be turned on when there is a faulty energy storage valve submodule in the energy storage valve; in the event that the power switch device fails to be turned on, control the bypass switch to be closed; in the event that the bypass switch fails to be closed, control the energy storage valve to be locked.

[0128] In some embodiments, the operation control module 802 is further configured to control the operation of the energy storage valve when the power switch device is successfully turned on.

[0129] In some embodiments, the operation control module 802 is further configured to control the operation of the energy storage valve when the bypass switch is successfully closed.

[0130] Each module in the above-mentioned energy storage valve operation control device can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor of the computer device in hardware form, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the corresponding operations of each of the above modules.

[0131] In the above-mentioned energy storage valve operation control device, a turning thyristor is arranged in parallel at the bypass switch of the power module of the energy storage valve submodule in the energy storage valve, and the power module is connected to the energy storage valve module through the switching device. In the event of a failure of the energy storage valve submodule in the energy storage valve, if the bypass of the faulty energy storage valve submodule fails, the energy storage valve is controlled to be locked first, so that the current of the energy storage valve is zero, and further by controlling the switch device to successfully open the gate, the capacitor of the power module is subjected to a high voltage, changing the working state of the turning thyristor, so that the faulty energy storage valve submodule is successfully bypassed through the turning thyristor, and the energy storage valve is controlled to exit the lock and enter the operating state. In the above scheme, in the event of a failure to bypass the faulty energy storage valve submodule, the turning thyristor can further realize the bypass of the faulty energy storage valve submodule to protect the faulty energy storage valve submodule, rather than directly shutting down the entire energy storage valve. In this way, the possibility of failure of bypass protection of the faulty energy storage valve submodule when a faulty energy storage valve submodule occurs can be greatly reduced, the phenomenon of overall shutdown of the energy storage valve can be alleviated, and the operational reliability of the energy storage system can be effectively improved.

[0132] Please refer to Figure 1. The present application also provides an energy storage valve submodule, including a controller (not shown), a power module 101, an energy storage module 105 and a switch device 103. The power module 101 includes a capacitor C, a bypass switch K, a turn thyristor D, and a first power switch device T1 and a second power switch device T2 connected in series. The bypass switch K is connected in parallel with the first power switch device T1, and the turn thyristor D is connected in parallel with the bypass switch K. Both ends of the turn thyristor D are cascaded with adjacent energy storage valve submodules. The end of the first power switch device T1 away from the second power switch device T2 is connected to the first end of the capacitor C, and the end of the second power switch device T2 away from the first power switch device T1 is connected to the second end of the capacitor C. The first and second ends of the capacitor C are respectively connected to the energy storage module 105 through the switch device 103. The controller is configured to control the switch device 103 to open when the energy storage valve submodule fails and the bypass of the failed energy storage valve submodule fails, so that the failed energy storage valve submodule can be bypassed through the turn thyristor D.

[0133] The specific protection scheme for the energy storage valve submodule in the event of a fault is as described in the above embodiments and will not be repeated here. The controller can be a submodule control board in the energy storage valve submodule, or a submodule control board including the energy storage valve submodule, a power switch driver board, and a bypass switch driver board. The specific types of the first power switch device T1 and the second power switch device T2 are not unique. In some embodiments, the two have the same structure and can include a power switch tube and a diode connected in reverse parallel with the power switch tube. The power switch tube can be a transistor, a field effect tube, or an IGBT (insulated gate bipolar transistor), etc., without specific limitation.

[0134] In the above-mentioned energy storage valve submodule, if a fault occurs in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, the energy storage valve is first controlled to lock, reducing the current in the energy storage valve to zero. Furthermore, by successfully opening the switch device 103, the capacitor C of the power module 101 is subjected to a high voltage, changing the operating state of the transition thyristor D, thereby successfully bypassing the faulty energy storage valve submodule through the transition thyristor D. The energy storage valve is then controlled to exit the lock state and enter the operating state. In the above-mentioned solution, if the bypass of the faulty energy storage valve submodule fails, the transition thyristor D can further bypass the faulty energy storage valve submodule, protecting the energy storage valve submodule and improving the operational safety of the energy storage valve submodule.

[0135] In some embodiments, the switching device 103 includes a driving component, a first switching component, and a second switching component. The driving component is used to drive the first switching component and the second switching component. The first end of the capacitor C is connected to the energy storage module 105 through the first switching component, and the second end of the capacitor C is connected to the energy storage module 105 through the second switching component.

[0136] The controller includes a submodule control board, a power switch driver board, and a bypass switch driver board. The submodule control board is communicatively connected to the energy storage valve control device, the power switch driver board, and the bypass switch driver board, respectively. This constitutes a control system that implements operational control, such as switching, of the energy storage valve submodule. In this embodiment, the drive assembly is communicatively connected to the submodule control board and is used to drive the first and second switch assemblies under the control of the submodule control board. When the submodule control board sends an opening signal, the drive assembly will drive the first and second switch assemblies to open simultaneously. When the submodule control board sends a closing signal, the drive assembly will drive the first and second switch assemblies to close simultaneously.

[0137] It should be noted that the specific type of the switching device 103 is not unique. In some embodiments, the switching device 103 includes an isolating switch, which can not only achieve isolation between the power module 101 and the energy storage module 105, but also add an electrical isolation point for maintenance.

[0138] In the above solution, a dual-switch type switch device 103 is provided between the power module 101 and the energy storage module 105, thereby achieving reliable isolation between the power module 101 and the energy storage module 105 and effectively reducing the cost of implementing bypass protection of the energy storage valve submodule.

[0139] It can be understood that in another embodiment, the switching device 103 can also adopt a switching device of the type that a single drive component drives a single switching component. Correspondingly, in this case, two switching devices 103 need to be set between the power module 101 and the energy storage module 105 to achieve reliable isolation of the power module 101 and the energy storage module 105.

[0140] The present application also provides an energy storage valve, comprising an energy storage valve control device and the above-mentioned energy storage valve sub-modules in cascade, wherein the controllers of the respective energy storage valve sub-modules are respectively connected to the energy storage valve control device.

[0141] The energy storage valve submodules are shown in the above-mentioned embodiments and accompanying drawings and will not be described in detail here. The energy storage valve operation control method of the above-mentioned embodiments is executed by an energy storage valve control device. The controllers (i.e., submodule control boards) of each energy storage valve submodule are respectively connected to the energy storage valve control device for communication. The energy storage valve control device controls the energy storage valve submodules by sending control signals to the controller, which is then further executed by the controller.

[0142] Each cascaded energy storage valve submodule in the energy storage valve is equipped with a turn-on thyristor D in parallel at the bypass switch K of the power module 101. The power module 101 is connected to the energy storage valve module via a switch device 103. In the event of a failure in the energy storage valve submodule, if the faulty energy storage valve submodule fails to bypass, the energy storage valve is controlled to first lock, reducing the current in the energy storage valve to zero. Furthermore, by successfully opening the switch device 103, the capacitor C of the power module 101 is subjected to a high voltage, changing the operating state of the turn-on thyristor D. This allows the faulty energy storage valve submodule to be successfully bypassed through the turn-on thyristor D, and the energy storage valve is controlled to exit the lock state and enter the operating state. With the above solution, if the faulty energy storage valve submodule fails to bypass, the turn-on thyristor D can further bypass the faulty energy storage valve submodule, protecting the energy storage valve submodule and improving the operational safety of the energy storage valve submodule.

[0143] The present application also provides an energy storage system, comprising a converter valve and the above-mentioned energy storage valve.

[0144] The energy storage valve is as shown in the above-mentioned embodiments and drawings, and will not be described in detail here. The energy storage system can be a high-voltage direct current energy storage system, etc., and is not specifically limited. Each cascaded energy storage valve submodule in the energy storage valve is provided with a turning thyristor D in parallel at the bypass switch K of the power module 101, and the power module 101 is connected to the energy storage valve module through the switch device 103. In the event of a failure of the energy storage valve submodule in the energy storage valve, if the bypass of the faulty energy storage valve submodule fails, the energy storage valve is controlled to be locked first, so that the current of the energy storage valve is zero, and further by controlling the switch device 103 to open the gate successfully, the capacitor C of the power module 101 is subjected to a high voltage, changing the working state of the turning thyristor D, so that the faulty energy storage valve submodule is successfully bypassed through the turning thyristor D, and the energy storage valve is controlled to exit the lock and enter the operating state. In the above solution, when the faulty energy storage valve submodule fails to be bypassed, the faulty energy storage valve submodule can be further bypassed through the turning thyristor D, thereby protecting the energy storage valve submodule and improving the operational safety of the energy storage valve submodule.

[0145] 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 method for controlling the operation of an energy storage valve, wherein: include: When there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, controlling the energy storage valve to be locked; Sending a trip signal to the switch device of the faulty energy storage valve submodule; wherein the capacitor of the power module of the faulty energy storage valve submodule is connected to the energy storage module of the faulty energy storage valve submodule through the switch device; When the switch device is opened successfully and the faulty energy storage valve submodule is bypassed successfully through the turning thyristor, the energy storage valve is controlled to operate; wherein the turning thyristor is connected in parallel with the bypass switch of the power module.

2. The energy storage valve operation control method according to claim 1, wherein: When the faulty energy storage valve submodule is successfully bypassed through the turning thyristor, controlling the energy storage valve to operate includes: When the transition thyristor of the faulty energy storage valve submodule is passively broken down, the energy storage valve is controlled to operate.

3. The energy storage valve operation control method according to claim 2, wherein: The passive breakdown of the transition thyristor of the faulty energy storage valve submodule includes: When the switch device is opened, obtaining voltage parameters at both ends of the turning thyristor of the faulty energy storage valve submodule; When the voltage parameter changes to zero within a preset time period, determining that the transition thyristor is passively broken down; If the voltage parameter does not change to zero within the preset time period, it is determined that the transition thyristor does not undergo passive breakdown.

4. The energy storage valve operation control method according to any one of claims 1 to 3, wherein: In the case that there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, after controlling the energy storage valve to be locked, the method further includes: In the case where the energy storage valve is locked successfully, executing the step of sending a trip signal to the switch device of the faulty energy storage valve submodule; In the case where the energy storage valve fails to lock, the energy storage valve is controlled to stop operating.

5. The energy storage valve operation control method according to any one of claims 1 to 4, wherein: After sending the opening signal to the switch device of the faulty energy storage valve submodule, the method further includes: When the switch device is opened successfully and the faulty energy storage valve submodule is not bypassed successfully through the turning thyristor, the energy storage valve is controlled to stop operating.

6. The energy storage valve operation control method according to any one of claims 1 to 5, wherein: After sending the opening signal to the switch device of the faulty energy storage valve submodule, the method further includes: In the case where the switch device fails to open, the energy storage valve is controlled to stop operating.

7. The energy storage valve operation control method according to any one of claims 1 to 6, wherein: When there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails, controlling the energy storage valve to be locked includes: In the case that there is a faulty energy storage valve submodule in the energy storage valve, controlling the power switch device connected in parallel with the bypass switch in the power module of the faulty energy storage valve submodule to be turned on; In the event that the power switch device fails to turn on, controlling the bypass switch to close; In the case where the bypass switch fails to close, the energy storage valve is controlled to be locked.

8. A storage valve operation control device, wherein: include: An operation control module, used for controlling the energy storage valve to be locked when there is a faulty energy storage valve submodule in the energy storage valve and the bypass of the faulty energy storage valve submodule fails; A gate opening control module, used to send a gate opening signal to the switch device of the faulty energy storage valve submodule; wherein the capacitor of the power module of the faulty energy storage valve submodule is connected to the energy storage module of the faulty energy storage valve submodule through the switch device; The operation control module is also used to control the operation of the energy storage valve when the switch device is successfully opened and the faulty energy storage valve submodule is successfully bypassed through the turning thyristor; wherein the turning thyristor is connected in parallel with the bypass switch of the power module.

9. A storage valve submodule, wherein: include: A controller, a power module, an energy storage module and a switch device, wherein the power module includes a capacitor, a bypass switch, a thyristor, and a first power switch device and a second power switch device connected in series; The bypass switch is connected in parallel with the first power switch device, the turn thyristor is connected in parallel with the bypass switch, both ends of the turn thyristor are cascaded with adjacent energy storage valve submodules respectively, one end of the first power switch device away from the second power switch device is connected to the first end of the capacitor, one end of the second power switch device away from the first power switch device is connected to the second end of the capacitor, the first end and the second end of the capacitor are connected to the energy storage module respectively through the switch device, and the first power switch device, the bypass switch and the switch device are connected to the controller respectively; The controller is used for controlling the switch device to open the gate when the energy storage valve submodule fails and the bypass of the failed energy storage valve submodule fails, so that the failed energy storage valve submodule is bypassed through the turning thyristor.

10. The energy storage valve submodule according to claim 9, wherein: The switch device includes a drive component, a first switch component and a second switch component, the drive component is connected to the first switch component and the second switch component respectively, the first end of the capacitor is connected to the energy storage module through the first switch component, and the second end of the capacitor is connected to the energy storage module through the second switch component.

11. A storage valve, wherein: It comprises an energy storage valve control device and a cascaded energy storage valve submodule as described in any one of claims 9 to 10, wherein the controllers of each of the energy storage valve submodules are respectively connected to the energy storage valve control device.

12. An energy storage system, wherein: It comprises a flow-converting valve and the energy storage valve as claimed in claim 11.

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