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

Abstract

The invention relates to an energy storage valve operation control method and device, an energy storage valve sub-module, an energy storage valve and an energy storage system.Under the condition that the energy storage valve sub-module in the energy storage valve breaks down, if bypass of the broken-down energy storage valve sub-module fails, the energy storage valve is controlled to be locked firstly, the current on the energy storage valve is made to be zero, and then the energy storage valve is stopped; furthermore, the capacitor of the power module bears high voltage and the working state of the turning thyristor is changed by controlling the switching device to be successfully switched off, so that the fault energy storage valve sub-module is successfully bypassed through the turning thyristor, and the energy storage valve is controlled to quit locking and enter an operation state. According to the scheme, under the condition that bypass of the fault energy storage valve sub-module fails, bypass of the fault energy storage valve sub-module can be further achieved through the turning thyristor, so that the fault energy storage valve sub-module is protected, the whole energy storage valve is not directly stopped, the phenomenon that the whole energy storage valve is stopped is relieved, and the operation reliability of the energy storage system can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly to a method and device for controlling the operation of an energy storage valve, an energy storage valve sub-module, an energy storage valve, and an energy storage system. Background Art

[0002] With the development of science and technology, as an important power system regulation resource, the energy storage system brings more and more great convenience in electricity use to people's daily production and life. Among various energy storage systems, the modular energy storage system has gradually been applied due to its advantages such as high modularity, low network loss, and good economic benefits. The modular energy storage system usually controls the switching operation of each energy storage valve sub-module according to the actual operation state. During this process, the faulty energy storage valve sub-module needs to be bypassed and removed.

[0003] However, in the related art, when the bypass of the faulty energy storage valve sub-module fails, the entire energy storage valve will be shut down, greatly reducing the operation reliability of the energy storage system. Summary of the Invention

[0004] Based on this, it is necessary to provide a method and device for controlling the operation of an energy storage valve, an energy storage valve, and an energy storage system to reduce the possibility of failure of the bypass protection of the faulty energy storage valve sub-module and improve the operation reliability of the energy storage system.

[0005] The present application provides a method for controlling the operation of an energy storage valve, including: when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails, controlling the energy storage valve to be locked; sending a tripping signal to the switching device of the faulty energy storage valve sub-module; wherein, the capacitor of the power module of the faulty energy storage valve sub-module is connected to the energy storage module of the faulty energy storage valve sub-module through the switching device; when the switching device trips successfully and the faulty energy storage valve sub-module is successfully bypassed through the commutation thyristor, controlling the energy storage valve to operate; wherein, the commutation thyristor is connected in parallel with the bypass switch of the power module.

[0006] The above energy storage valve operation control method is such that at the bypass switch of the power module of the energy storage valve sub-module in the energy storage valve, a turning thyristor is connected in parallel, and the power module is connected to the energy storage valve module through a switching device. In the case of a failure of the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first controlled to lock, so that the current on the energy storage valve is zero. Further, by controlling the switching device to successfully trip, the capacitor of the power module bears a high voltage, changing the working state of the turning thyristor, so that the faulty energy storage valve sub-module is successfully bypassed through the turning thyristor, and the energy storage valve is controlled to exit the locked state and enter the operating state. In the above solution, in the case of the bypass failure of the faulty energy storage valve sub-module, the faulty energy storage valve sub-module can be further bypassed through the turning thyristor to protect the faulty energy storage valve sub-module, rather than directly shutting down the entire energy storage valve. In this way, the possibility of bypass protection failure of the faulty energy storage valve sub-module when a faulty energy storage valve sub-module appears can be greatly reduced, the phenomenon of the overall shutdown of the energy storage valve can be alleviated, and the operating reliability of the energy storage system can be effectively improved.

[0007] In some embodiments, when the faulty energy storage valve sub-module is successfully bypassed through the turning thyristor, controlling the operation of the energy storage valve includes: when the turning thyristor of the faulty energy storage valve sub-module is passively broken down, controlling the operation of the energy storage valve.

[0008] In the above solution, the voltage across the turning thyristor is increased by tripping the switching device, so that the turning thyristor is passively broken down, the two ends of the turning thyristor are short-circuited, and then the bypass function of the faulty energy storage valve sub-module is realized. It has the advantages of simple implementation method and high bypass efficiency.

[0009] In some embodiments, the passive breakdown of the turning thyristor of the faulty energy storage valve sub-module includes: when the switching device trips, obtaining the voltage parameter across the turning thyristor of the faulty energy storage valve sub-module; within a preset time period, when the voltage parameter changes to zero, determining that the turning thyristor is passively broken down; within a preset time period, when the voltage parameter does not change to zero, determining that the turning thyristor is not passively broken down.

[0010] In the above solution, by detecting whether the voltage parameter across the turning thyristor changes to zero within a preset time period to determine whether the turning thyristor is passively broken down, it has high detection efficiency and detection accuracy.

[0011] In some embodiments, after controlling the energy storage valve to lock when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails, it further includes: when the energy storage valve is successfully locked, performing the step of sending a tripping signal to the switching device of the faulty energy storage valve sub-module; when the energy storage valve fails to lock, controlling the energy storage valve to shut down.

[0012] After the above solution controls the energy storage valve to lock, it is also necessary to further detect whether the energy storage valve is successfully locked. When the energy storage valve is successfully locked, the opening control of the switching device is executed to improve the opening reliability of the switching device.

[0013] In some embodiments, after sending the opening signal to the switching device of the faulty energy storage valve sub-module, it further includes: when the switching device successfully opens and the faulty energy storage valve sub-module fails to bypass successfully through the turning thyristor, controlling the energy storage valve to shut down.

[0014] After the above solution, when the switching device successfully opens, it will further check whether the faulty energy storage valve sub-module can be bypassed through the turning thyristor. When it still cannot be bypassed through the turning thyristor, the energy storage valve is controlled to shut down to reduce the possibility of further expansion of the energy storage valve fault.

[0015] In some embodiments, after sending the opening signal to the switching device of the faulty energy storage valve sub-module, it further includes: when the switching device fails to open, controlling the energy storage valve to shut down.

[0016] After the above solution, when the switching device fails to open, the energy storage valve is directly controlled to shut down to reduce the possibility of further expansion of the energy storage valve fault.

[0017] In some embodiments, the controlling the energy storage valve to lock when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails includes: when there is a faulty energy storage valve sub-module in the energy storage valve, controlling the power switch device in parallel with the bypass switch in the power module of the faulty energy storage valve sub-module to conduct; when the conduction of the power switch device fails, controlling the bypass switch to close; when the closing of the bypass switch fails, controlling the energy storage valve to lock.

[0018] After the above solution, when a faulty energy storage valve sub-module appears in the energy storage valve, first control the power switch device in parallel with the bypass switch to conduct to bypass the faulty energy storage valve sub-module. If the conduction fails, control the bypass switch to close to bypass the faulty energy storage valve sub-module. When the bypass switch also fails to bypass, then enable the turning thyristor to bypass. In this way, multi-level protection can be provided for the bypass of the energy storage valve sub-module, and the bypass success rate of the energy storage valve sub-module can be improved.

[0019] The present application also provides an energy storage valve operation control device, including: an operation control module, configured to control the energy storage valve to lock when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails; a trip control module, configured to send a trip signal to the switching device of the faulty energy storage valve sub-module; wherein, the capacitor of the power module of the faulty energy storage valve sub-module is connected to the energy storage module of the faulty energy storage valve sub-module through the switching device; the operation control module is further configured to control the energy storage valve to operate when the switching device trips successfully, so that the faulty energy storage valve sub-module bypasses successfully through the turn-off thyristor; wherein, the turn-off thyristor is connected in parallel with the bypass switch of the power module.

[0020] The present application also provides an energy storage valve sub-module, including a controller, a power module, an energy storage module and a switching device. The power module includes a capacitor, a bypass switch, a turn-off 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 turn-off thyristor is connected in parallel with the bypass switch, two ends of the turn-off thyristor are respectively cascaded with adjacent energy storage valve sub-modules, one end of the first power switching device far from the second power switching device is connected to the first end of the capacitor, one end of the second power switching device far 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, the first power switching device, the bypass switch and the switching device are respectively connected to the controller; the controller is configured to control the switching device to trip when a fault occurs in the energy storage valve sub-module and the bypass of the faulty energy storage valve sub-module fails, so that the faulty energy storage valve sub-module bypasses through the turn-off thyristor.

[0021] For the above energy storage valve sub-module, when a fault occurs in the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first controlled to lock, so that the current on the energy storage valve is zero. Further, by controlling the switching device to trip successfully, the capacitor of the power module bears a high voltage, changing the working state of the turn-off thyristor, so that the faulty energy storage valve sub-module bypasses successfully through the turn-off thyristor, and the energy storage valve is controlled to exit the locked state and enter the operating state. The above solution can further realize the bypass of the faulty energy storage valve sub-module through the turn-off thyristor when the bypass of the faulty energy storage valve sub-module fails, protect the energy storage valve sub-module, and improve the operating safety of the energy storage valve sub-module.

[0022] In some embodiments, the switching device includes a driving component, a first switching component, and a second switching component. The driving component is respectively connected to the first switching component and the second switching component. 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.

[0023] In the above solution, by setting a switching device of the double-switch type between the power module and the energy storage module, reliable isolation between the power module and the energy storage module can be achieved, and the implementation cost of the bypass protection of the energy storage valve sub-module can be effectively reduced.

[0024] The present application also provides an energy storage valve, which includes an energy storage valve control device and the above-mentioned cascaded energy storage valve sub-modules. The controllers of the respective energy storage valve sub-modules are respectively connected to the energy storage valve control device.

[0025] The present application also provides an energy storage system, which includes a converter valve and the above-mentioned energy storage valve. Description of the Drawings

[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0027] Figure 1 is a schematic structural diagram of an energy storage valve sub-module in some embodiments of the present application;

[0028] Figure 2 is a schematic flow diagram of an energy storage valve operation control method in some embodiments of the present application;

[0029] Figure 3 is a schematic flow diagram of an energy storage valve operation control method in some other embodiments of the present application;

[0030] Figure 4 is a schematic flow diagram of an energy storage valve operation control method in some other embodiments of the present application;

[0031] Figure 5 is a schematic flow diagram of an energy storage valve operation control method in some other embodiments of the present application;

[0032] Figure 6 is a schematic flow diagram of an energy storage valve operation control method in some other embodiments of the present application;

[0033] Figure 7 is a schematic structural diagram of an energy storage valve operation control device in some embodiments of the present application;

[0034] Figure 8Schematic diagram of the structure of the energy storage valve operation control device in some other embodiments of the present application. Detailed implementation manners

[0035] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0038] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0040] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of sheets" refers to two or more sheets (including two sheets).

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0042] At present, from the perspective of the development of the market situation, the application of energy storage systems is becoming more and more extensive, bringing great convenience in electricity use to daily production and life. Due to its highly modular structure, the modular energy storage system can meet the requirements of high efficiency, high reliability, economy, and safety, and has gradually been developed and applied.

[0043] In a modular energy storage system, the energy storage valve is built by cascading energy storage valve sub-modules with a modular structure. According to actual operation requirements, the energy storage valve sub-modules of the energy storage valve can be controlled to be put into operation or cut out of operation through an energy storage valve control device. Further, when each energy storage valve sub-module is put into operation, fault monitoring can be continuously carried out on each energy storage valve sub-module. When a fault occurs in an energy storage valve sub-module, the bypass switch of the energy storage valve sub-module can be closed, or the power switch tube connected in parallel with the bypass switch can be turned on to bypass and remove the faulty energy storage valve sub-module to protect the faulty energy storage valve sub-module.

[0044] However, due to the relatively complex power environment in which the energy storage system is located, in actual operation scenarios, the bypass switch or power switch tube of the energy storage valve sub-module often fails to act or fails to operate. In this case, to alleviate the phenomenon that the continued operation of the faulty energy storage valve sub-module causes more serious faults or affects the reliable operation of the energy storage system, the energy storage valve where the faulty energy storage valve sub-module is located is usually directly shut down. Currently, the bypass protection method for faulty energy storage valve sub-modules has poor reliability, and it is very easy for the energy storage system to be shut down unnecessarily due to the failure of the energy storage valve sub-module, greatly reducing the operation reliability of the energy storage system.

[0045] To alleviate the above phenomenon, through research, it is found that an additional level of bypass protection can be added to the energy storage valve sub-module. When both the bypass switch and the power switch tube connected in parallel with the bypass switch fail to bypass, the bypass function of the energy storage valve sub-module can still be realized through the newly added level of protection, so as to cut out and protect the faulty energy storage valve sub-module.

[0046] Based on the above considerations and 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. However, when the energy storage valve sub-module fails, the working state of the turning thyristor can be changed to bypass the faulty energy storage valve sub-module through the turning thyristor.

[0047] Based on this, in the solution of the embodiment of the present application, a turning thyristor is connected in parallel at the bypass switch of the power module of the energy storage valve sub-module, and the power module is connected to the energy storage valve module through a switching device. When a fault occurs in the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first locked to make the current on the energy storage valve zero. Further, by controlling the switching device to trip successfully, the capacitor of the power module bears a high voltage, and the working state of the turning thyristor is changed, so that the faulty energy storage valve sub-module is successfully bypassed through the turning thyristor, and the energy storage valve is controlled to exit the locked state and enter the operating state.

[0048] Through the above solution, when the bypass of the faulty energy storage valve sub-module fails, the faulty energy storage valve sub-module can be further bypassed through the turning thyristor to protect the faulty energy storage valve sub-module, rather than directly shutting down the entire energy storage valve. In this way, the possibility of bypass protection failure of the faulty energy storage valve sub-module when a faulty energy storage valve sub-module appears can be greatly reduced, the phenomenon of the overall shutdown of the energy storage valve can be alleviated, and the operation reliability of the energy storage system can be effectively improved.

[0049] The energy storage valve operation control method provided by 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 a plurality of cascaded energy storage valve sub-modules. Each energy storage valve sub-module realizes switching under the control of the energy storage valve control device and its own sub-module control board. Moreover, the energy storage valve can be further controlled by the energy storage valve control device to enter different operating states such as locked or shutdown.

[0050] Reference can be made in combination with Figure 1, each energy storage valve sub-module in the energy storage valve includes a power module 101, an energy storage module 105, and a switching device 103. The power module 101 and the energy storage module 105 are connected through the switching device 103, and the two can be isolated by opening the switching device 103. The power module 101 further includes a power circuit, a bypass switch K, a turning thyristor D, and a capacitor C. The power circuit includes two series-connected power switching tubes (i.e., T1 and T2 shown in the figure). The two ends of one power switching tube (T1) are used as the AC terminals of the power circuit. At the AC terminals, a bypass switch K and a turning thyristor D are arranged in parallel in sequence. The two ends formed after the two power switching tubes are connected in series are used as the DC terminals of the power circuit. A capacitor C is arranged in parallel at the DC terminals. The two ends of the capacitor C are respectively connected to the energy storage module 105 through the switching device 103.

[0051] More specifically, the energy storage valve sub-module further includes a sub-module control board, a power switch drive board, and a bypass switch drive board. The sub-module control board is respectively communicatively connected to the energy storage valve control device, the power switch drive board, and the bypass switch drive board. In this way, a control system is built to realize the switching and other operation controls of the energy storage valve sub-module.

[0052] It can be understood that the modular energy storage system type in the embodiments of the present application is not unique. In one embodiment, it can be a high-voltage DC directly-connected energy storage system. In other embodiments, it can also be a medium- and low-voltage energy storage system, etc., which is not specifically limited. For the convenience of understanding the technical solution of the present application, in the following embodiments, it is understood that the energy storage valve operation control method is applied to a modular energy storage system of the high-voltage DC directly-connected type.

[0053] Please refer to Figure 2 , the present application provides an energy storage valve operation control method, which includes step 202, step 204, and step 206.

[0054] Step 202, when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails, control the energy storage valve to lock.

[0055] Specifically, the energy storage valve is a device formed by cascading multiple energy storage valve sub-modules and having the function of storing and accessing electric energy. The energy storage valve sub-module is the smallest modular unit in the system that realizes the storage and access of electric energy. The faulty energy storage valve sub-module is an energy storage valve sub-module that has a fault and needs to be cut off for protection. Locking is a state in which the current of the energy storage valve is controlled to zero while the energy storage valve remains connected to the power grid.

[0056] Please refer to in combination Figure 1, the energy storage valve sub-module of the 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 series-connected first power switching device T1 and second power switching device T2; the bypass switch K is connected in parallel with the first power switching device T1, the turning thyristor D is connected in parallel with the bypass switch K, both ends of the turning thyristor D are respectively cascaded with adjacent energy storage valve sub-modules, one end of the first power switching device T1 away from the second power switching device T2 is connected to the first end of the capacitor C, and one end of the second power switching device T2 away from the first power switching device T1 is connected to the second end of the capacitor C. The first end and the second end of the capacitor C are respectively connected to the energy storage module 105 through the switching device 103.

[0057] In the energy storage valve sub-module with this structure, if the energy storage valve control device detects that a certain energy storage valve sub-module fails, it will first perform a bypass operation through the first power switching device and / or the bypass switch. In the case of failure of the bypass of the first power switching device and / or the bypass switch, it is considered that the bypass of the faulty energy storage valve sub-module fails. At this time, the energy storage valve will be locked, which can reduce the possibility of accidents caused by the continuous operation of the energy storage valve.

[0058] It should be noted that the method for the energy storage valve control device to control the locking of the energy storage valve is not unique. In a more detailed embodiment, by controlling the relevant devices in the energy storage valve, the current of the energy storage valve is reduced to zero, thereby realizing the locking of the energy storage valve. In the actual scenario, the specific method of reducing the current of the energy storage valve to zero is not limited, and it can be achieved by controlling the operation of the circuit breaker or contactor between the energy storage valve and the AC bus of the energy storage system.

[0059] Step 204, send a trip signal to the switching device of the faulty energy storage valve sub-module.

[0060] Specifically, the capacitor of the power module of the faulty energy storage valve sub-module is connected to the energy storage module of the faulty energy storage valve sub-module through the switching device. The switching device is a switching device arranged in the busbar cabinet between the power module and the energy storage module of the energy storage valve, used to isolate the power module and the energy storage module. In the solution of this embodiment, when the bypass of both the bypass switch and / or the power switching device connected in parallel with the bypass switch fails, the energy storage valve control device will control the locking of the energy storage valve. At this time, the switching device meets the operating conditions, and the energy storage valve control device will send a trip signal to the sub-module control board of the faulty energy storage valve sub-module. The sub-module 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.

[0061] It should be noted that the specific type of the switching device is not unique, and any switch that has a tripping function to disconnect the connection between the power module and the energy storage module can be used. For example, in a more detailed embodiment, the switching device includes a disconnecting switch, that is, a disconnecting 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 through the tripping of the disconnecting switch. In other embodiments, the switching device can also use a solid-state circuit breaker, etc., and no specific limitation is made.

[0062] Step 206, when the switching device trips successfully and the faulty energy storage valve sub-module is successfully bypassed through the turn-on thyristor, control the operation of the energy storage valve.

[0063] Specifically, the turn-on thyristor is connected in parallel with the bypass switch of the power module. The turn-on thyristor is also a turn-on diode, also known as a reverse-blocking two-terminal thyristor or a Shockley diode, which is a unidirectional switch diode that can operate in a forward-switching mode. When the forward voltage reaches the rated value, it can achieve turn-on conduction.

[0064] In the solution of this embodiment, the turn-on thyristor is connected in parallel at both ends of the bypass switch. The two ends of the turn-on thyristor can be regarded as the AC terminals of the energy storage valve sub-module and are cascaded with adjacent energy storage valve sub-modules respectively. Therefore, by means of the turn-on thyristor entering a specific working state (equivalent to a short-circuit state), the current can flow at both ends of the turn-on thyristor and will not flow to the subsequent power switching device, etc., realizing the same bypass function as the bypass switch.

[0065] When the switching device trips successfully, the voltage across the capacitor of the power module rises rapidly and is applied to the turn-on thyristor, changing the working state of the turn-on thyristor. Eventually, the faulty energy storage valve sub-module is successfully bypassed through the turn-on thyristor, and the faulty energy storage valve sub-module is removed from the current energy storage valve. The faulty energy storage valve sub-module will not affect the energy storage valve. Therefore, at this time, the energy storage valve control device controls the energy storage valve to exit the locked state and switch to the operating state. Specifically, controlling the operation of the energy storage valve at this time means controlling the energy storage valve to exit the locked state and putting the structure after removing the faulty energy storage valve sub-module into the operation of the energy storage valve.

[0066] 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 on 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, and the working state of the turning thyristor is changed, 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 bypass of the faulty energy storage valve submodule can be further realized 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 bypass protection failure 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.

[0067] See also Figure 3 In some embodiments, after step 204 , the method further includes step 302 .

[0068] Step 302: 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.

[0069] Specifically, in the solution of this embodiment, after the switch device is successfully opened, the energy storage valve control device will also monitor the faulty energy storage valve submodule. In the actual operation scenario, due to capacitor failure, open circuit between the capacitor and the turning thyristor, etc., even if the switch device is successfully opened, the faulty energy storage valve submodule cannot be bypassed through the turning thyristor. At this time, in order to improve the operational safety of the energy storage valve and reduce the risk of faulty operation of the faulty energy storage valve submodule, the energy storage valve control device will control the energy storage valve to stop operating.

[0070] In the above scheme, when the switch device is successfully opened, it will further check whether the energy storage valve submodule can be bypassed through the turning thyristor. When the bypass cannot be achieved through the turning thyristor, the energy storage valve is controlled to stop operating, thereby reducing the possibility of further expansion of the energy storage valve fault.

[0071] 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.

[0072] Specifically, in the solution of this embodiment, the fault energy storage valve sub-module is bypassed through the reverse-conducting thyristor by means of passive breakdown. In another embodiment, it may also be a method of short-circuiting the reverse-conducting thyristor by controlling the commutation failure of the reverse-conducting thyristor, and the bypass function is realized through the reverse-conducting thyristor, which is not specifically limited. The commutation failure of the reverse-conducting thyristor means that the reverse-conducting thyristor cannot normally return to the off state in the forward conduction state, usually due to reasons such as too long turn-off time of the switch, too large current, too large voltage, etc. Therefore, in the solution of this embodiment, when the switching device is successfully switched off, causing the voltage across the reverse-conducting thyristor to increase, corresponding pulses can be output to control the commutation of the reverse-conducting thyristor, thereby causing the commutation failure of the reverse-conducting thyristor and entering the short-circuit state.

[0073] Specifically, with reference to Figure 1 , in the solution of this embodiment, when the switching device is successfully switched off, the first power switching device cannot conduct normally, and the second power switching device is controlled to be in the conducting state. The voltage across the capacitor rises rapidly and is applied to the reverse-conducting thyristor, causing the voltage across the reverse-conducting thyristor to rise rapidly. When the breakdown voltage of the reverse-conducting thyristor is reached, the reverse-conducting thyristor is broken down. At this time, the two ends of the reverse-conducting thyristor can be regarded as being in a short-circuit state, so the energy storage valve sub-module where it is located can be bypassed.

[0074] In the above solution, by opening the switching device to increase the voltage across the reverse-conducting thyristor, the reverse-conducting thyristor is passively broken down, so that the two ends of the reverse-conducting thyristor are short-circuited, and then the bypass function of the fault energy storage valve sub-module is realized, which has the advantages of simple implementation method and high bypass efficiency.

[0075] In some embodiments, the passive breakdown of the reverse-conducting thyristor of the fault energy storage valve sub-module includes: when the disconnector is opened, obtaining the voltage parameter across the reverse-conducting thyristor; when the voltage parameter changes to zero within a preset time period, determining that the reverse-conducting thyristor is passively broken down; when the voltage parameter does not change to zero within a preset time period, determining that the reverse-conducting thyristor is not passively broken down.

[0076] Specifically, when the reverse-conducting thyristor is broken down, the two ends of the reverse-conducting thyristor are equivalent to a short circuit. At this time, there is no voltage drop across the reverse-conducting thyristor, that is, the voltage parameter across the reverse-conducting thyristor is zero. Therefore, it is possible to determine whether the reverse-conducting thyristor is passively broken down by obtaining the voltage parameter across the reverse-conducting thyristor and judging whether the voltage parameter changes to zero within a preset time period.

[0077] It can be understood that in another embodiment, it is also possible to judge whether the reverse-conducting thyristor has a passive breakdown by monitoring the magnitude of the current flowing through the reverse-conducting thyristor or by monitoring the temperature of the reverse-conducting thyristor, etc., which is not specifically limited.

[0078] It should be noted that the method for obtaining the voltage parameters across the turning thyristor is not unique. In one embodiment, a voltage detection device, such as a voltage transformer, etc., can be arranged across the turning thyristor to collect the voltage across the turning thyristor and send it to the energy storage valve control device. The magnitude of the preset duration is not unique, and it only needs to be set in combination with the actual operating scenario of the energy storage valve sub-module so that the turning thyristor can complete breakdown within the preset duration. For example, in a more detailed embodiment, the preset duration can be set to be less than or equal to 10 ms (milliseconds).

[0079] The above solution determines whether the turning thyristor is passively broken down by detecting whether the voltage parameters across the turning thyristor change to zero within the preset duration, and has high detection efficiency and detection accuracy.

[0080] Please refer to Figure 4 , in some embodiments, after step 204, the method further includes step 402.

[0081] Step 402, when the switch device fails to trip, control the energy storage valve to stop operating.

[0082] Specifically, in the solution of this embodiment, after the energy storage valve control device sends a trip signal to the switch device, due to communication failures or other reasons, the switch device may not be able to implement the trip function according to the trip signal, that is, the switch device fails to trip. At this time, to improve the operating safety of the energy storage valve and reduce the risk brought by the faulty operation of the energy storage valve sub-module, the energy storage valve control device will control the energy storage valve to stop operating.

[0083] Through the solution of this embodiment, four-level protection measures of power switch device conduction, bypass switch closing, turning thyristor breakdown, and energy storage valve shutdown are adopted to protect the faulty energy storage valve sub-module, and the possibility of the faulty energy storage valve sub-module continuing to operate is reduced as much as possible without stopping the energy storage valve. Or three-level protection measures of power switch device conduction, turning thyristor breakdown, and energy storage valve shutdown are adopted to protect the faulty energy storage valve sub-module, or three-level protection measures of bypass switch closing, turning thyristor breakdown, and energy storage valve shutdown are adopted to protect the faulty energy storage valve sub-module, and specific selection can be made in combination with actual requirements.

[0084] The above solution directly controls the energy storage valve to stop operating when the switch device fails to trip, reducing the possibility of further expansion of the energy storage valve fault.

[0085] Please refer to Figure 5 , in some embodiments, step 202 includes step 502, step 504, and step 506.

[0086] Step 502, when there is a faulty energy storage valve sub-module in the energy storage valve, control the power switch device in parallel with the bypass switch in the power module of the faulty energy storage valve sub-module to conduct.

[0087] Step 504, when the conduction of the power switch device fails, control the bypass switch to close.

[0088] Step 506, when the closing of the bypass switch fails, control the energy storage valve to lock.

[0089] Specifically, in the solution of this embodiment, taking the case where both the power switch device in parallel with the bypass switch and the bypass switch fail to bypass, and it is considered that the bypass of the faulty energy storage valve sub-module fails (i.e., four-level protection) as an example for explanation. In the case of a fault in the energy storage valve sub-module, first control the power switch device in parallel with the bypass switch. When the conduction of the power switch device fails, then control the bypass switch to close, so as to achieve the cut-off control of the faulty energy storage valve sub-module. It can be understood that in other embodiments, it can also be that in the case of a fault in the energy storage valve sub-module, first control the bypass switch to close. When the closing of the bypass switch fails, then control the power switch device in parallel with the bypass switch to conduct, so as to achieve the cut-off control of the faulty energy storage valve sub-module.

[0090] In the above solution, in the case of a faulty energy storage valve sub-module in the energy storage valve, first control the power switch device in parallel with the bypass switch to conduct to bypass the faulty energy storage valve sub-module. If the conduction fails, then control the bypass switch to close to bypass the faulty energy storage valve sub-module. In the case where the bypass switch also fails to bypass, then enable the turning thyristor for bypass. In this way, multi-level protection can be provided for the bypass of the energy storage valve sub-module, and the bypass success rate of the energy storage valve sub-module can be improved.

[0091] Please refer to Figure 6 , in some embodiments, after step 502, the method further includes step 602.

[0092] Step 602, when the conduction of the power switch device is successful, control the energy storage valve to operate.

[0093] Specifically, when a fault occurs in the energy storage valve sub-module, after the energy storage valve control device sends a conduction signal to the switch device in parallel with the bypass switch in the faulty energy storage valve sub-module, it will monitor the conduction state of the power switch device in real time. If the power switch device conducts, it means that the faulty energy storage valve sub-module is cut off from the energy storage valve; if the conduction of the power switch device fails, it means that the faulty energy storage valve sub-module is still connected to the energy storage valve for operation. In the case where the faulty energy storage valve sub-module has been cut off from the energy storage valve, the faulty energy storage valve sub-module will not affect the operation of the energy storage valve. At this time, only need to control the energy storage valve to operate, that is, control the energy storage valve to maintain operation in the current state.

[0094] In the above solution, if the power switch device of the faulty energy storage valve sub-module conducts successfully, the bypass of the faulty energy storage valve sub-module can be achieved without the need for closing control of the bypass switch, effectively improving the removal efficiency of the faulty energy storage valve sub-module.

[0095] Please refer to Figure 6 , in some embodiments, after step 504, the method further includes step 604.

[0096] Step 604, control the energy storage valve to operate when the bypass switch closes successfully.

[0097] Specifically, when the energy storage valve control device fails to conduct the power switch device parallel to the bypass switch in the faulty energy storage valve sub-module, it sends a closing signal to the bypass switch and monitors the open and closed states of the bypass switch in real time. If the bypass switch closes, it means that the faulty energy storage valve sub-module is removed from the energy storage valve; if the bypass switch does not close, it means that the faulty energy storage valve sub-module is still connected to the energy storage valve for operation. When the faulty energy storage valve sub-module has been removed from the energy storage valve, the faulty energy storage valve sub-module will not affect the operation of the energy storage valve. At this time, only the energy storage valve needs to be controlled to operate, that is, to control the energy storage valve to maintain operation in the current state.

[0098] In the above solution, if the bypass switch of the faulty energy storage valve sub-module closes successfully, the bypass of the faulty energy storage valve sub-module can be achieved without the need for opening control of the switch device, effectively improving the removal efficiency of the faulty energy storage valve sub-module.

[0099] In some embodiments, controlling the power switch device parallel to the bypass switch in the power module of the faulty energy storage valve sub-module to conduct includes: controlling the sub-module control board and / or the power switch drive board of the faulty energy storage valve sub-module to send a conduction signal to the power switch device parallel to the bypass switch.

[0100] Specifically, in the solution of this embodiment, the energy storage valve sub-module further includes a sub-module control board, a power switch drive board, and a bypass switch drive board. The sub-module control board is communicatively connected to the energy storage valve control device, and is used to receive relevant control instructions sent by the energy storage valve control device and feedback operation-related information to the energy storage valve control device. The power switch drive board and the bypass switch drive board are respectively communicatively connected to the sub-module control board.

[0101] After the energy storage valve control device detects a fault in the energy storage valve sub-module, the energy storage valve control device communicates with the sub-module control board of the faulty energy storage valve sub-module, sends a conduction instruction to the sub-module control board, and the sub-module control board can further send the conduction instruction to the power switch drive board. After receiving the conduction instruction, the sub-module control board can directly generate a conduction signal according to the conduction instruction and send it to the power switch device to control the power switch device to conduct. The power switch drive board can also generate a conduction signal according to the conduction instruction and send it to the power switch device to control its conduction.

[0102] Therefore, in an actual operation scenario, it is possible to select the sub-module control board to send a conduction signal to the power switch device according to requirements to control the power switch device to conduct; and / or select the power switch drive board to send a conduction signal to the power switch device to control the power switch device to conduct. More specifically, in one embodiment, both the sub-module control board and the power switch drive board send conduction signals to the power switch device, so as to achieve redundant conduction control of the power switch device and improve the conduction success rate of the power switch device.

[0103] It can be understood that both the sub-module control board and the power switch drive board send conduction signals to the power switch device. Specifically, it can be that the sub-module control board and the power switch drive board send conduction signals simultaneously; it can also be that the sub-module control board sends a conduction signal first, and if the power switch device does not conduct, then the power switch drive board sends a conduction signal; it can also be that the power switch drive board sends a conduction signal first, and if the power switch device does not conduct, then the sub-module control board sends a conduction signal. There is no specific limitation.

[0104] In the above solution, the power switch device can be conducted under the control of the sub-module control board and / or the power switch drive board, effectively improving the conduction success rate of the power switch device.

[0105] In some embodiments, controlling the bypass switch to close includes: controlling the sub-module control board and / or the bypass switch drive board of the faulty energy storage valve sub-module to send a closing signal to the bypass switch.

[0106] Specifically, 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 sub-module control board and / or the bypass switch drive board, and specific selection can be made in combination with actual requirements. More specifically, when both the sub-module control board and the bypass switch drive board issue conduction signals, it can also be issued simultaneously or sequentially, and details are not elaborated here.

[0107] In the above solution, the bypass switch can be conducted under the control of the sub-module control board and / or the bypass switch drive board, effectively improving the closing success rate of the bypass switch.

[0108] In some embodiments, please refer to Figure 7, after step 202, the method further includes step 702.

[0109] Step 702, when the energy storage valve fails to lock, control the energy storage valve to stop operating.

[0110] When the energy storage valve locks successfully, execute step 204.

[0111] Specifically, as shown above, the locking of the energy storage valve means reducing the current flowing through the energy storage valve to zero so that the switching device has the operating condition. In the solution of this embodiment, after the energy storage valve control device controls the energy storage valve to perform the locking action, it is necessary to monitor in real time whether the energy storage valve locks successfully. When the energy storage valve locks successfully, further execute the step of sending a trip signal to the switching device of the faulty energy storage valve sub-module. When the energy storage valve does not lock successfully, control the energy storage valve to stop operating to reduce the possibility of greater safety hazards caused by the continuous operation of the energy storage valve.

[0112] It can be understood that the method for the energy storage valve control device to judge whether the energy storage valve locks successfully is not unique. In a more detailed embodiment, a current detector can be set on the energy storage valve. The current detector is communicatively connected to the energy storage valve control device. After the energy storage valve control device issues a locking control signal to the energy storage valve, it receives in real time the current value collected and sent by the current detector, and judges that if the current value changes to zero within a certain time, it is considered that the energy storage valve locks successfully. If the current value does not change to zero within a certain time, it is considered that the energy storage valve locks fails. In other embodiments, other methods can also be used to detect whether the energy storage valve locks successfully. For example, detecting whether the output power of the energy storage valve is zero, etc., which is not specifically limited.

[0113] In the above solution, after controlling the energy storage valve to lock, it is necessary to further detect whether the energy storage valve locks successfully. When the energy storage valve locks successfully, perform the trip control of the switching device to improve the trip reliability of the switching device.

[0114] To facilitate the understanding of the technical solution of this application, the following will explain this application in combination with a more detailed embodiment.

[0115] In each energy storage valve sub-module cascaded in the energy storage valve, a turning thyristor is connected in parallel at the bypass switch, and the power module and the energy storage module are connected through a switching device. During the operation of the energy storage valve connected to the energy storage system, the energy storage valve control device monitors the faults of each energy storage valve sub-module in real time. When a faulty energy storage valve sub-module is detected, the energy storage valve control device first sends a conduction instruction related to the conduction of the power switching device to the sub-module control board of the faulty energy storage valve sub-module. The sub-module control board sends the conduction instruction to the power switch drive board, and then the sub-module control board and the power switch drive board send conduction signals to the power switching device connected in parallel with the bypass switch at the same time. The energy storage valve control device monitors whether the power switching device is successfully conducted according to the signals fed back by the sub-module control board or the power switch drive board. If the conduction is successful, it indicates that the faulty energy storage valve sub-module has been bypassed and protected, and at this time, the energy storage valve can be controlled to continue operating. If the conduction is not successful, it is necessary to enter the protection action of the next-level faulty energy storage valve sub-module.

[0116] Similarly, in the protection of this level of faults, the energy storage valve control device sends a closing instruction related to the closing of the bypass switch to the sub-module control board of the faulty energy storage valve sub-module. The sub-module control board sends the closing instruction to the bypass switch drive board, and then the sub-module control board and the bypass switch drive board send closing signals to the bypass switch at the same time. The energy storage valve control device monitors whether the bypass switch device is successfully closed according to the signals fed back by the sub-module control board or the power switch drive board. If the closing is successful, it indicates that the faulty energy storage valve sub-module has been bypassed and protected, and at this time, the energy storage valve can be controlled to continue operating. If the closing is not successful, it is necessary to control the energy storage valve to be locked. Within a certain period of time after the output of the locking-related signal, if the energy storage valve control device monitors that the current at both ends of the energy storage valve drops to zero, it is determined that the energy storage valve is successfully locked, and the protection action of the next-level faulty energy storage valve sub-module is entered; if the energy storage valve control device monitors that the current at both ends of the energy storage valve does not drop to zero, it is determined that the energy storage valve locking fails.

[0117] In the protection of this level of faulty energy storage valve sub-module after the energy storage valve is successfully locked, the energy storage valve control device sends a tripping instruction related to the tripping of the switching device to the sub-module control board of the faulty energy storage valve sub-module. The sub-module control board generates a tripping signal according to the tripping instruction and sends it to the switching device. Then the energy storage valve control device monitors whether the switching device is successfully tripped according to the information fed back by the sub-module control board. In the case where the switching device is successfully tripped, it further monitors whether the turning thyristor is broken down (which can be achieved by monitoring the negative voltage or current of the turning thyristor). If the turning thyristor is broken down under the voltage across the capacitor, it indicates that the faulty energy storage valve sub-module has been bypassed and protected, and at this time, the energy storage valve is controlled to end the locking and enter the operating state to continue operating.

[0118] If the switching device fails to trip successfully, or the commutation thyristor fails to break down successfully, the energy storage valve control device will enter the last stage of protection. At this time, the energy storage valve control device controls the energy storage valve where the faulty energy storage valve sub-module is located to stop operating, waits to be put into operation after subsequent troubleshooting, reduces the risk of further expansion of the fault, and improves the operating reliability of the energy storage valve.

[0119] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0120] Based on the same inventive concept, an embodiment of the present application also provides an energy storage valve operation control device for implementing the above-mentioned energy storage valve operation control method. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the energy storage valve operation control device provided below can refer to the limitations on the energy storage valve operation control method in the above text, and will not be repeated here.

[0121] Please refer to Figure 8 , the present application also provides an energy storage valve operation control device, including: an operation control module 802 and a trip control module 804.

[0122] The operation control module 802 is used to control the energy storage valve to lock when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails; the trip control module 804 is used to send a trip signal to the switching device of the faulty energy storage valve sub-module; the operation control module 802 is also used to control the operation of the energy storage valve when the switching device trips successfully and the faulty energy storage valve sub-module bypasses successfully through the commutation thyristor.

[0123] In some embodiments, the operation control module 802 is further used to control the energy storage valve to stop operating when the switching device fails to trip.

[0124] In some embodiments, the operation control module 802 is further used to control the energy storage valve to stop operating when the switching device trips successfully and the faulty energy storage valve sub-module fails to bypass successfully through the commutation thyristor.

[0125] In some embodiments, the operation control module 802 is further configured to control the power switch device connected in parallel with the bypass switch in the power module of the faulty energy storage valve sub-module when there is a fault in the energy storage valve; control the bypass switch to close when the conduction of the power switch device fails; and control the energy storage valve to lock when the closing of the bypass switch fails.

[0126] In some embodiments, the operation control module 802 is further configured to control the operation of the energy storage valve when the conduction of the power switch device is successful.

[0127] In some embodiments, the operation control module 802 is further configured to control the operation of the energy storage valve when the bypass switch closes successfully.

[0128] Each module in the above energy storage valve operation control device can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in the processor of the computer device in hardware form or independent of it, or stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above respective modules.

[0129] In the above energy storage valve operation control device, a commutation thyristor is connected in parallel at the bypass switch of the power module of the energy storage valve sub-module in the energy storage valve, and the power module is connected to the energy storage valve module through a switching device. When a fault occurs in the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first controlled to lock to make the current on the energy storage valve zero, and further, by controlling the switching device to open successfully, the capacitor of the power module bears a high voltage, changing the working state of the commutation thyristor, so that the faulty energy storage valve sub-module is successfully bypassed through the commutation thyristor, and the energy storage valve is controlled to exit the locked state and enter the operating state. In the above solution, when the bypass of the faulty energy storage valve sub-module fails, the faulty energy storage valve sub-module can be further bypassed through the commutation thyristor to protect the faulty energy storage valve sub-module, rather than directly shutting down the entire energy storage valve. In this way, the possibility of bypass protection failure of the faulty energy storage valve sub-module can be greatly reduced when a faulty energy storage valve sub-module appears, the phenomenon of the overall shutdown of the energy storage valve can be alleviated, and the operation reliability of the energy storage system can be effectively improved.

[0130] Please refer to Figure 1, this application also provides an energy storage valve sub-module, which includes a controller (not shown in the figure), 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 series-connected first power switching device T1 and second power switching device T2; the bypass switch K is connected in parallel with the first power switching device T1, the turning thyristor D is connected in parallel with the bypass switch K, and both ends of the turning thyristor D are respectively cascaded with adjacent energy storage valve sub-modules. One end of the first power switching device T1 away from the second power switching device T2 is connected to the first end of the capacitor C, and one end of the second power switching device T2 away from the first power switching device T1 is connected to the second end of the capacitor C. The first end and the second end of the capacitor C are respectively connected to the energy storage module 105 through the switching device 103; the controller is used to control the switching device 103 to trip when the energy storage valve sub-module fails and the bypass of the faulty energy storage valve sub-module fails, so that the faulty energy storage valve sub-module is bypassed through the turning thyristor D.

[0131] Specifically, the specific protection scheme when the energy storage valve sub-module fails is as shown in the above various embodiments and will not be elaborated here. The controller can be a sub-module control board in the energy storage valve sub-module, or include a sub-module control board, a power switch drive board, and a bypass switch drive board of the energy storage valve sub-module. The specific types of the first power switching device T1 and the second power switching device T2 are not unique. In one embodiment, their structures are the same and can include a power switch tube and a diode connected in anti-parallel with the power switch tube. Among them, the power switch tube can be a transistor, a field effect tube, or an IGBT (Insulated Gate Bipolar Transistor), etc., and no specific limitation is made.

[0132] For the above energy storage valve sub-module, when a fault occurs in the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first locked to make the current on the energy storage valve zero. Further, by successfully controlling the switching device 103 to trip, the capacitor C of the power module 101 bears a high voltage, changing the working state of the turning thyristor D, so that the faulty energy storage valve sub-module is successfully bypassed through the turning thyristor D, and the energy storage valve is controlled to exit the locked state and enter the operating state. The above solution can further realize the bypass of the faulty energy storage valve sub-module through the turning thyristor D when the bypass of the faulty energy storage valve sub-module fails, protect the energy storage valve sub-module, and improve the operating safety of the energy storage valve sub-module.

[0133] 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.

[0134] Specifically, the controller includes a sub-module control board, a power switch drive board, and a bypass switch drive board. The sub-module control board is communicatively connected to the energy storage valve control device, the power switch drive board, and the bypass switch drive board respectively. In this way, a control system is built to realize the operation control such as the switching of the energy storage valve sub-module. In the solution of this embodiment, the drive assembly is communicatively connected to the sub-module control board and is used to drive the first switch assembly and the second switch assembly to act under the control of the sub-module control board. Specifically, when the sub-module control board sends a tripping signal, the drive assembly will drive the first switch assembly and the second switch assembly to trip simultaneously. When the sub-module control board sends a closing signal, the drive assembly will drive the first switch assembly and the second switch assembly to close simultaneously.

[0135] It should be noted that the specific type of the switch device 103 is not unique. In a more detailed embodiment, the switch device 103 includes a disconnector. Through the disconnector, not only can the isolation between the power module 101 and the energy storage module 105 be realized, but also an electrical isolation point can be added for maintenance.

[0136] In the above solution, by setting a switch device 103 of the double-switch type between the power module 101 and the energy storage module 105, the reliable isolation between the power module 101 and the energy storage module 105 can be realized, and the implementation cost of the bypass protection of the energy storage valve sub-module can be effectively reduced.

[0137] It can be understood that in another embodiment, the switch device 103 can also adopt a switch device of the type that a single drive assembly drives a single switch assembly. Correspondingly, at this time, two switch devices 103 need to be set between the power module 101 and the energy storage module 105 to realize the reliable isolation between the power module 101 and the energy storage module 105.

[0138] This application also provides an energy storage valve, which includes an energy storage valve control device and the above-mentioned cascaded energy storage valve sub-modules. The controllers of each energy storage valve sub-module are respectively connected to the energy storage valve control device.

[0139] Specifically, the energy storage valve sub-module is as shown in the above various embodiments and the drawings, and will not be elaborated here. The operation control method of the energy storage valve in the above embodiment is executed by the energy storage valve control device. The controllers (i.e., the sub-module control boards) of each energy storage valve sub-module are respectively communicatively connected to the energy storage valve control device. For the control actions of the energy storage valve control device on the energy storage valve sub-module, the control signals are sent to the controller, and then the controller further executes them.

[0140] For each cascaded energy storage valve sub-module in the energy storage valve, a turning thyristor D is connected 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 switching device 103. In the case of a fault in the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first controlled to be locked to make the current on the energy storage valve zero. Further, by successfully controlling the opening of the switching device 103, the capacitor C of the power module 101 bears a high voltage, changing the working state of the turning thyristor D, so that the faulty energy storage valve sub-module is successfully bypassed through the turning thyristor D, and the energy storage valve is controlled to exit the locked state and enter the operating state. In the above solution, in the case of the failure of the bypass of the faulty energy storage valve sub-module, the bypass of the faulty energy storage valve sub-module can be further realized through the turning thyristor D, protecting the energy storage valve sub-module and improving the operating safety of the energy storage valve sub-module.

[0141] The present application also provides an energy storage system, including a converter valve and the above-mentioned energy storage valve.

[0142] Specifically, the energy storage valve is as shown in the above various embodiments and the drawings, which will not be elaborated here. The energy storage system can be a high-voltage DC directly-connected energy storage system, etc., which is not specifically limited. For each cascaded energy storage valve sub-module in the energy storage valve, a turning thyristor D is connected 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 switching device 103. In the case of a fault in the energy storage valve sub-module in the energy storage valve, if the bypass of the faulty energy storage valve sub-module fails, the energy storage valve is first controlled to be locked to make the current on the energy storage valve zero. Further, by successfully controlling the opening of the switching device 103, the capacitor C of the power module 101 bears a high voltage, changing the working state of the turning thyristor D, so that the faulty energy storage valve sub-module is successfully bypassed through the turning thyristor D, and the energy storage valve is controlled to exit the locked state and enter the operating state. In the above solution, in the case of the failure of the bypass of the faulty energy storage valve sub-module, the bypass of the faulty energy storage valve sub-module can be further realized through the turning thyristor D, protecting the energy storage valve sub-module and improving the operating safety of the energy storage valve sub-module.

[0143] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for controlling the operation of an energy storage valve, characterized in that, it includes: When there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails, control the energy storage valve to lock; Send a trip signal to the switching device of the faulty energy storage valve sub-module; wherein, the capacitor of the power module of the faulty energy storage valve sub-module is connected to the energy storage module of the faulty energy storage valve sub-module through the switching device; When the switching device trips successfully and the faulty energy storage valve sub-module bypasses successfully through the turning thyristor, control the energy storage valve to operate; wherein, the turning thyristor is connected in parallel with the bypass switch of the power module.

2. The method for controlling the operation of an energy storage valve according to claim 1, characterized in that, When the faulty energy storage valve sub-module bypasses successfully through the turning thyristor, controlling the energy storage valve to operate includes: When the turning thyristor of the faulty energy storage valve sub-module is passively broken down, control the energy storage valve to operate.

3. The method for controlling the operation of an energy storage valve according to claim 2, characterized in that, The passive breakdown of the turning thyristor of the faulty energy storage valve sub-module includes: When the switching device trips, obtain the voltage parameter across the turning thyristor of the faulty energy storage valve sub-module; If the voltage parameter turns to zero within a preset time period, determine that the turning thyristor is passively broken down; If the voltage parameter does not turn to zero within a preset time period, determine that the turning thyristor is not passively broken down.

4. The method for controlling the operation of an energy storage valve according to any one of claims 1-3, characterized in that, After controlling the energy storage valve to lock when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails, it further includes: When the energy storage valve locks successfully, perform the step of sending a trip signal to the switching device of the faulty energy storage valve sub-module; When the energy storage valve locks fails, control the energy storage valve to stop operating.

5. The method for controlling the operation of an energy storage valve according to any one of claims 1-4, characterized in that, After sending a trip signal to the switching device of the faulty energy storage valve sub-module, it further includes: When the switching device trips successfully and the faulty energy storage valve sub-module does not bypass successfully through the turning thyristor, control the energy storage valve to stop operating.

6. The method for controlling the operation of an energy storage valve according to any one of claims 1-5, characterized in that, After sending a trip signal to the switching device of the faulty energy storage valve sub-module, it further includes: When the switching device trips fails, control the energy storage valve to stop operating.

7. The method for controlling the operation of an energy storage valve according to any one of claims 1-6, characterized in that, Controlling the energy storage valve to lock when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails includes: When there is a faulty energy storage valve sub-module 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 sub-module to conduct; In the case of the conduction failure of the power switch device, control the closing of the bypass switch; In the case of the closing failure of the bypass switch, control the locking of the energy storage valve.

8. An energy storage valve operation control device, characterized in that, comprising: An operation control module, configured to control the locking of the energy storage valve when there is a faulty energy storage valve sub-module in the energy storage valve and the bypass of the faulty energy storage valve sub-module fails; A tripping control module, configured to send a tripping signal to the switch device of the faulty energy storage valve sub-module; wherein, the capacitor of the power module of the faulty energy storage valve sub-module is connected to the energy storage module of the faulty energy storage valve sub-module through the switch device; The operation control module is further configured to control the operation of the energy storage valve when the switch device trips successfully and the faulty energy storage valve sub-module bypasses successfully through the turning thyristor; wherein, the turning thyristor is connected in parallel with the bypass switch of the power module.

9. An energy storage valve sub-module, characterized in that, comprising: A controller, a power module, an energy storage module and a switch device, the power module includes a capacitor, a bypass switch, a turning 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 turning thyristor is connected in parallel with the bypass switch, both ends of the turning thyristor are respectively cascaded with adjacent energy storage valve sub-modules, 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 respectively connected to the energy storage module through the switch device, and the first power switch device, the bypass switch and the switch device are respectively connected to the controller; The controller is configured to control the switch device to trip when a fault occurs in the energy storage valve sub-module and the bypass of the faulty energy storage valve sub-module fails, so that the faulty energy storage valve sub-module bypasses through the turning thyristor.

10. The energy storage valve sub-module according to claim 9, characterized in that, The switch device includes a driving component, a first switch component and a second switch component, the driving component is respectively connected to the first switch component and the second switch component, 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. An energy storage valve, characterized in that, comprising an energy storage valve control device and the energy storage valve sub-modules according to any one of claims 9-10 connected in cascade, and the controllers of each energy storage valve sub-module are respectively connected to the energy storage valve control device.

12. An energy storage system, characterized in that, comprising a converter valve and the energy storage valve according to claim 11.

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