Energy storage valve operation method and device, energy storage system, computer equipment and medium

Abstract

The invention relates to an energy storage valve operation method and device, an energy storage system, computer equipment, a storage medium and a computer program product. In the operation process, according to adjusting reference voltages at the two ends of an energy storage valve and capacitor voltages of all energy storage valve sub-modules capable of being put into operation in the energy storage valve, the energy storage valve can be operated according to the adjusting reference voltages at the two ends of the energy storage valve; and the actual redundancy number of the redundant energy storage valve sub-modules in the current energy storage valve is updated in real time. And finally, the energy storage valve is controlled to operate in combination with the actual redundancy number and the fault number of the fault energy storage valve sub-modules. According to the scheme, the actual redundancy number of the redundant energy storage valve sub-modules can be updated and obtained in real time in the operation process of the energy storage valve, and operation of the energy storage valve is controlled according to the actual redundancy number. The possibility that the energy storage valve is shut down due to the fact that the number of the redundant energy storage valve sub-modules changes is reduced, and the problem that the energy storage valve is likely to be shut down due to the redundant energy storage valve sub-modules is solved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage valve operation method, device, energy storage system, computer equipment, storage medium and computer program product. Background Art

[0002] With the development of the power grid, energy storage technology has become an important part of it. Among various energy storage technologies, high-voltage direct-mounted energy storage technology integrates the VSC (Voltage Source Converter) converter valve with the energy storage valve. It has the advantages of high modularity, low network loss, good economic benefits, and high operational reliability, and has gradually been applied. To ensure the reliable operation of the energy storage valve, the energy storage system generally configures a redundant energy storage valve submodule for the energy storage valve on the basis of the rated energy storage valve submodule.

[0003] However, in the related art, the energy storage valve is easily out of service due to the redundant energy storage valve submodule. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, energy storage system, computer equipment, storage medium and computer program product for operating an energy storage valve to alleviate the problem that the energy storage valve is prone to shutdown due to redundant energy storage valve submodules.

[0005] A method for operating an energy storage valve comprises: obtaining the number of faults of a faulty energy storage valve submodule in an energy storage valve; updating the actual number of redundant energy storage valve submodules in real time according to a regulation reference voltage at both ends of the energy storage valve and a capacitor voltage of an energy storage valve submodule that can be put into operation in the energy storage valve; and controlling the operation of the energy storage valve according to the actual number of redundancies and the number of faults.

[0006] The above-mentioned energy storage valve operation method can update the actual redundant number of redundant energy storage valve submodules in the current energy storage valve in real time during operation according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of each energy storage valve submodule that can be put into operation in the energy storage valve. Finally, the operation of the energy storage valve is controlled in combination with the actual redundant number and the number of failures of the faulty energy storage valve submodule. Through the above scheme, the actual redundant number of redundant energy storage valve submodules can be updated in real time during the operation of the energy storage valve, and the operation of the energy storage valve is controlled by the actual redundant number. Reduce the possibility of the energy storage valve being shut down due to changes in the number of redundant energy storage valve submodules, and alleviate the problem that the energy storage valve is easily shut down due to redundant energy storage valve submodules.

[0007] In some embodiments, the actual redundant number of redundant energy storage valve submodules is updated in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, including: real-time acquisition of the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve and the adjustment reference voltage at both ends of the energy storage valve; determining the average capacitor voltage according to the capacitor voltage; determining the actual redundant number of redundant energy storage valve submodules according to the adjustment reference voltage and the average capacitor voltage.

[0008] The above scheme combines the capacitor voltages of each energy storage valve submodule that can be put into operation in the energy storage valve to determine the average capacitor voltage, and uses the average capacitor voltage to determine the actual redundant number of redundant energy storage valve submodules in the current energy storage valve, thereby realizing dynamic pressure equalization control of the energy storage valve, and maximizing redundancy under the premise of pressure equalization.

[0009] In some embodiments, determining the actual redundant number of redundant energy storage valve submodules based on the adjusted reference voltage and the average capacitor voltage includes: obtaining the total number of energy storage valve submodules in the energy storage valve; determining the number of energy storage valve submodules required to be put into operation based on the adjusted reference voltage and the average capacitor voltage; and determining the actual redundant number of redundant energy storage valve submodules based on the total number and the number of inputs.

[0010] The above scheme determines the actual redundancy number by combining the total number of energy storage valve submodules in the energy storage valve and the number of energy storage valve submodules required to be put into operation, thereby improving the accuracy of the actual redundancy number.

[0011] In some embodiments, determining the number of energy storage valve submodules required to be put into operation based on the adjustment reference voltage and the average capacitor voltage includes: determining the number of energy storage valve submodules required to be put into operation based on the ratio of the adjustment reference voltage to the average capacitor voltage.

[0012] The above scheme adjusts the ratio of the reference voltage to the average capacitor voltage to determine the input quantity, so that the input quantity matches the actual operating state of the energy storage valve, thereby improving the accuracy of the input quantity.

[0013] In some embodiments, controlling the operation of the energy storage valve according to the actual redundant number and the fault number includes: controlling the energy storage valve to stop operating when the fault number is greater than the actual redundant number; and maintaining the operation of the energy storage valve when the fault number is less than or equal to the actual redundant number.

[0014] The above scheme controls the energy storage valve to maintain operation or stop operation based on the number of faults and the actual redundancy number, so that the energy storage valve operates in a state where the number of faults is less than the actual redundancy number, thereby improving the operating reliability of the energy storage valve.

[0015] In some embodiments, obtaining the fault number of the faulty energy storage valve submodule in the energy storage valve includes: obtaining the bypass number of the energy storage valve submodule in the bypass state in the energy storage valve; and determining the fault number of the faulty energy storage valve submodule according to the bypass number.

[0016] The above scheme determines the number of faults based on the number of bypasses of the energy storage valve submodules in the bypass state in the energy storage valve, and has the advantages of high fault determination efficiency and accuracy.

[0017] A storage valve operation device comprises: a fault acquisition module, used to obtain the fault number of a faulty energy storage valve submodule in an energy storage valve; a redundancy analysis module, used to update the actual redundancy number of redundant energy storage valve submodules in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve; and an operation control module, used to control the operation of the energy storage valve according to the actual redundancy number and the fault number.

[0018] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above-mentioned energy storage valve operation method when executing the computer program.

[0019] A computer-readable storage medium stores a computer program, which implements the steps of the energy storage valve operation method when executed by a processor.

[0020] A computer program product comprises a computer program, which implements the steps of the energy storage valve operation method when executed by a processor.

[0021] An energy storage system comprises a converter valve, an energy storage valve controller and an energy storage valve, wherein the converter valve is connected to the energy storage valve, the energy storage valve controller is connected to the energy storage valve, and the energy storage valve controller is used to execute the steps of the above-mentioned energy storage valve operation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the energy storage system in some embodiments of the present application;

[0024] Figure 2 This is a schematic diagram of the structure of the energy storage valve submodule in some embodiments of the present application;

[0025] Figure 3 This is a schematic diagram of the relationship between SOC and voltage of the energy storage module in some embodiments of the present application;

[0026] Figure 4 This is a schematic flow chart of the energy storage valve operation method in some embodiments of the present application;

[0027] Figure 5 A schematic diagram of a process for determining the actual redundancy quantity in some embodiments of the present application;

[0028] Figure 6 A schematic diagram of a process for determining the actual redundancy quantity in other embodiments of the present application;

[0029] Figure 7 A schematic diagram of a process for determining the actual redundancy quantity in some other embodiments of the present application;

[0030] Figure 8 This is a schematic flow chart of the energy storage valve operation method in some other embodiments of the present application;

[0031] Fig. 9 This is a schematic flow chart of the energy storage valve operation method in some other embodiments of the present application;

[0032] Fig.10 This is a flow chart of the energy storage valve operation method in some embodiments of the present application;

[0033] Fig.11 This is a schematic diagram of the structure of the energy storage valve operating device in some embodiments of the present application;

[0034] Fig.12 This is a schematic diagram of the internal structure of a computer device in some embodiments of the present application. DETAILED DESCRIPTION

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

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

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] 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).

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. 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 the specific circumstances.

[0040] At present, from the perspective of market development, the application of energy storage systems is becoming more and more extensive, bringing great convenience to daily production and life. High-voltage direct current energy storage has a highly modular structure and can meet the needs of high efficiency, high reliability, economy and safety, and has gradually been developed and applied.

[0041] The high voltage direct current type energy storage system integrates the voltage source converter valve (also known as the VSC converter valve) and the energy storage valve. Figure 1 , as shown on the left, a voltage source converter valve 102 can be constructed using an MMC (Modular Multilevel Converter) structure. The energy storage valve 104 includes a cascaded energy storage valve submodule 101. The voltage source converter valve 102 is connected to at least one energy storage valve 104 through a DC bus (i.e., Vd+ and Vd- in the figure), and is constructed in conjunction with other electrical components (such as a grounding switch and an isolating switch, etc.) to form an energy storage valve system.

[0042] The energy storage valve submodule 101 in the energy storage valve 104 can be a power module with a full-bridge or half-bridge structure, which is connected to the energy storage module and then assembled. There is no specific limitation and the selection can be made according to actual needs. Figure 2, taking the energy storage valve submodule constructed by a half-bridge structure power module as an example, it includes a connected half-bridge power module 202 and an energy storage module 204. The energy storage module 204 can be a single-branch series battery or a multi-branch parallel battery, without specific limitation.

[0043] For any energy storage valve, in order to improve the operational reliability of the energy storage valve during its operation, a certain number of redundant energy storage valve submodules are usually configured on the basis of the rated number of submodules. In the event of a failure of the energy storage valve submodule, it can be quickly isolated through the bypass switch at the output port of the energy storage valve submodule, and the redundant energy storage valve submodule can be switched in to maintain the stable operation of the energy storage valve. In the event that the number of failed energy storage valve submodules is greater than the number of redundant energy storage valve submodules, the energy storage valve controller will control the energy storage valve to stop operating for maintenance.

[0044] However, research has found that the capacitor voltage of the energy storage valve submodule changes in real time due to the voltage of the energy storage module, and the number of energy storage valve submodules that can actually be redundant in the energy storage valve will also change accordingly. Figure 3 When the SOC (State of Charge) of the energy storage module in the energy storage valve submodule is less than a% (it may vary depending on the structure of the energy storage module or the battery), the voltage of the energy storage module increases as the SOC increases; when the SOC of the energy storage module is between a% and b% (it may vary depending on the structure of the energy storage module or the battery), the voltage of the energy storage module remains stable; when the SOC of the energy storage module is greater than b%, the voltage of the energy storage module increases as the SOC increases.

[0045] Normally, when configuring redundant energy storage valve submodules for energy storage valves, the minimum average voltage of the energy storage valve submodules is used as the standard to calculate the number of energy storage valve submodules required for operation, and then a certain number of redundant energy storage valve submodules are configured according to the redundancy ratio. In actual operation, as the SOC of the energy storage module increases, its voltage will also increase, the number of energy storage valve submodules that the system needs to put into operation will decrease, and the number of redundant energy storage valve submodules will increase. If the operation control of the energy storage valve is performed with a fixed number of redundant energy storage valve submodules, the number of redundant energy storage valve submodules used for operation control will be inconsistent with the actual number of redundant energy storage valve submodules, and ultimately, it is easy to cause the energy storage valve submodule to stop operating when it can operate normally.

[0046] After in-depth research, it was found that in order to alleviate the problem that the above-mentioned energy storage valve is easily shut down due to redundant energy storage valve sub-modules, the number of actually redundant energy storage valve sub-modules in the energy storage valve can be analyzed and calculated in real time during the operation of the energy storage valve, and the operation of the energy storage valve can be controlled in combination with the number of failures of the energy storage valve sub-modules.

[0047] Based on the above considerations, the technical solution of the embodiment of the present application provides a method for operating an energy storage valve, which can update the actual redundant number of redundant energy storage valve submodules in the current energy storage valve in real time according to the adjustment reference voltage at both ends of the energy storage valve (in the DC direct-hung energy storage scenario, it can be specifically the DC bus voltage) and the capacitor voltage of each energy storage valve submodule that can be put into operation in the energy storage valve. Finally, the operation of the energy storage valve is controlled in combination with the actual redundant number and the number of failures of the faulty energy storage valve submodule.

[0048] Through this control method, the actual redundant number of redundant energy storage valve submodules can be updated in real time during the operation of the energy storage valve, and the operation of the energy storage valve can be controlled by the actual redundant number. The possibility of the energy storage valve being shut down due to changes in the number of redundant energy storage valve submodules is reduced, and the problem that the energy storage valve is easily shut down due to redundant energy storage valve submodules is alleviated.

[0049] The energy storage valve operation method of the embodiment of the present application is applied to an energy storage system, and specifically, can be applied to Figure 1 The energy storage valve system of the high-voltage direct current energy storage system shown controls the energy storage valve to maintain operation or stop operation through the energy storage valve controller of the energy storage valve system. It can be understood that in other embodiments, the energy storage valve operation method can also be applied to other types of energy storage systems, such as medium and high voltage AC cascade energy storage systems, MMC AC energy storage systems, low-voltage energy storage systems, etc., without specific limitation.

[0050] See also Figure 4 , the energy storage valve operation method is applied to the energy storage valve controller for explanation. The present application provides an energy storage valve operation method, including step 402, step 404 and step 406.

[0051] Step 402, obtaining the number of faults of the faulty energy storage valve submodules in the energy storage valve.

[0052] Specifically, the energy storage valve is an energy storage structure formed by cascading multiple energy storage valve submodules; the faulty energy storage valve submodule is an energy storage valve submodule in which an operating fault occurs in the energy storage valve; and the number of faults is the number of energy storage valve submodules that have operating faults.

[0053] The technical solution of the embodiment of the present application is that when the energy storage valve is connected to the energy storage system for operation, the energy storage valve controller used for the operation control of the energy storage valve can obtain the number of faults of the faulty energy storage valve submodule in real time, so as to perform subsequent operation analysis. It can be understood that there is no unique way to obtain the number of faults in real time. In one embodiment, the number of faults can be obtained periodically with a specific duration as a cycle. The specific duration is set in combination with actual needs and is not specifically limited.

[0054] Step 404 , updating the actual redundant number of redundant energy storage valve submodules in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve.

[0055] Specifically, the reference voltage is the voltage used for reference and adjustment when the actual redundancy quantity is updated when the energy storage valve is connected to the energy storage system. In essence, it is the voltage at both ends of the energy storage valve. Taking the high-voltage direct-mounted energy storage system as an example, the two ends of the energy storage valve and the two ends of the voltage source converter valve are respectively connected to the positive and negative DC bus, that is, the energy storage valve and the voltage source converter valve are connected through the DC bus. Correspondingly, the reference voltage is the voltage on the DC bus used to connect the energy storage valve and the voltage source converter valve.

[0056] The energy storage valve submodule that can be put into operation is the energy storage valve submodule in the same energy storage valve that is in good condition and can operate normally. The capacitor voltage is the voltage across the DC support capacitor between the power conversion unit of the power module and the energy storage module in the energy storage valve submodule that can be put into operation. Figure 2 , the capacitor voltage is the voltage across the DC support capacitor C on the side of the half-bridge power module 202 close to the energy storage module 204 .

[0057] The redundant energy storage valve submodule is the energy storage valve submodule excluding the energy storage valve submodule required to be put into operation, assuming that there is no faulty energy storage valve submodule in the same energy storage valve. The actual redundant number is the number of redundant energy storage valve submodules obtained after analyzing the number of faults obtained in real time.

[0058] It should be pointed out that the methods for obtaining the adjustment reference voltage and the capacitor voltage are not unique. In one embodiment, voltage detectors may be respectively set at both ends of the energy storage valve (specifically, the DC bus) and the DC support capacitor. The voltage detector is communicatively connected with the energy storage valve controller, and the adjustment reference voltage and the capacitor voltage are obtained by real-time detection through the voltage detector.

[0059] In the actual operation process, the energy storage valve controller can determine whether the energy storage valve submodule is faulty according to the output voltage or other operating parameters of each energy storage valve submodule, and then distinguish the faulty energy storage valve submodule, and obtain the capacitor voltage of each energy storage valve submodule that can be put into operation through the voltage detector set at the DC support capacitor of the non-faulty energy storage valve submodule. Finally, the actual redundant number of redundant energy storage valve submodules is determined by combining the real-time adjustment reference voltage and each capacitor voltage.

[0060] Step 406: Control the operation of the energy storage valve according to the actual redundancy quantity and the failure quantity.

[0061] Specifically, during the operation of the energy storage valve, the energy storage valve controller adjusts the reference voltage and the capacitor voltage to determine the actual redundancy number, and then analyzes the actual redundancy number and the number of faults, and finally determines whether to shut down or maintain the operation of the energy storage valve based on the analysis results.

[0062] It should be noted that the energy storage valve controller is not the only way to control the energy storage valve to stop operation. In one embodiment, all energy storage valve submodules in the energy storage valve may be bypassed to stop the energy storage valve. In another embodiment, an isolating switch is provided between the energy storage valve and the DC bus, so the energy storage valve may be stopped by controlling the isolating switch to open. In other embodiments, the energy storage valve may be stopped by other methods, which are not specifically limited.

[0063] The above-mentioned energy storage valve operation method can update the actual redundant number of redundant energy storage valve submodules in the current energy storage valve in real time during operation according to the adjustment reference voltage of the energy storage valve and the capacitor voltage of each energy storage valve submodule that can be put into operation in the energy storage valve. Finally, the operation of the energy storage valve is controlled in combination with the actual redundant number and the number of failures of the faulty energy storage valve submodule. Through the above scheme, the actual redundant number of redundant energy storage valve submodules can be updated in real time during the operation of the energy storage valve, and the operation of the energy storage valve can be controlled with the actual redundant number. Reduce the possibility of the energy storage valve being shut down due to changes in the number of redundant energy storage valve submodules, and alleviate the problem that the energy storage valve is easily shut down due to redundant energy storage valve submodules.

[0064] See also Figure 5 In some embodiments, step 404 includes step 502 , step 504 , and step 506 .

[0065] Step 502 , obtaining in real time the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, and the adjustment reference voltage at both ends of the energy storage valve.

[0066] Step 504: determine the average capacitor voltage according to the capacitor voltage.

[0067] Step 506: Determine the actual redundant number of redundant energy storage valve submodules according to the adjusted reference voltage and the average capacitor voltage.

[0068] Specifically, the average capacitor voltage is the average value of the capacitor voltage. In the solution of this embodiment, the energy storage valve controller first obtains the adjustment reference voltage of the energy storage valve and the capacitor voltage at the DC support capacitor of each energy storage valve submodule that can be put into operation in real time through a voltage detector, and then averages the obtained capacitor voltages to obtain the average capacitor voltage, and finally determines the actual redundant number of redundant energy storage valve submodules in the energy storage valve under the current operating state by adjusting the reference voltage and the average capacitor voltage.

[0069] It should be pointed out that when the energy storage valve controller solves the average capacitor voltage based on the individual capacitor voltages, it can either add up all the capacitor voltages acquired in real time to solve the average, or remove the highest capacitor voltage and the lowest capacitor voltage and then add up the remaining capacitor voltages to solve the average. The specific choice can be made based on actual needs.

[0070] The above scheme combines the capacitor voltages of each energy storage valve submodule that can be put into operation in the energy storage valve to determine the average capacitor voltage, and uses the average capacitor voltage to determine the actual redundant number of redundant energy storage valve submodules in the current energy storage valve, thereby realizing dynamic pressure equalization control of the energy storage valve, and maximizing redundancy under the premise of pressure equalization.

[0071] See also Figure 6 In some embodiments, step 506 includes step 602 , step 604 , and step 606 .

[0072] Step 602, obtaining the total number of energy storage valve submodules in the energy storage valve.

[0073] Step 604: Determine the number of energy storage valve submodules that need to be put into operation according to the adjusted reference voltage and the average capacitor voltage.

[0074] Step 606: Determine the actual redundant quantity of the redundant energy storage valve submodules according to the total quantity and the input quantity.

[0075] Specifically, the total number of energy storage valve submodules is the number of cascaded energy storage valve submodules in the same energy storage valve. The energy storage valve submodules required to be put into operation are the energy storage valve submodules that need to be put into operation according to the current operating state to meet the system operation requirements. The number of inputs is the number of energy storage valve submodules that need to be put into operation.

[0076] When analyzing the actual redundancy number, the energy storage valve controller specifically combines the adjustment reference voltage and the average capacitor voltage for analysis and calculation to obtain the number of energy storage valve submodules that need to be put into operation; then the total number is subtracted from the number of inputs to obtain the actual redundancy number.

[0077] It should be pointed out that the method for obtaining the total number is not unique. In a more detailed embodiment, for different energy storage valves, the number of internal cascaded energy storage valve sub-modules can be pre-written into the energy storage valve controller as the total number, which can be directly called during subsequent operation.

[0078] The above scheme determines the actual redundancy number by combining the total number of energy storage valve submodules in the energy storage valve and the number of energy storage valve submodules required to be put into operation, thereby improving the accuracy of the actual redundancy number.

[0079] See also Figure 7, in some embodiments, step 604 includes step 702.

[0080] Step 702: Determine the number of energy storage valve submodules that need to be put into operation according to the ratio of the adjusted reference voltage to the average capacitor voltage.

[0081] Specifically, during the operation of the energy storage valve system, each energy storage valve submodule participates in the voltage balancing, and finally the sum of the voltages at both ends of each energy storage valve submodule participating in the operation is basically consistent with the adjustment reference voltage. Therefore, when calculating the number of energy storage valve submodules actually required to be put into operation, the average capacitor voltage achieved when the energy storage valve submodule participates in the voltage balancing and the adjustment reference voltage can be combined to solve the ratio, so as to adjust the ratio of the reference voltage and the average capacitor voltage, determine the number of inputs, and realize the real-time dynamic adjustment of the number of inputs and the number of redundancies of the energy storage valve submodules.

[0082] It should be noted that the method of determining the input quantity by adjusting the ratio of the reference voltage to the average capacitor voltage is not unique. In one embodiment, the ratio of the reference voltage to the average capacitor voltage may be used as the input quantity. In another embodiment, the input quantity may be finally determined by adjusting the ratio of the reference voltage to the average capacitor voltage.

[0083] For example, in a more detailed embodiment, when the ratio of the adjustment reference voltage to the average capacitor voltage is an integer, the ratio can be directly used as the input quantity. When the ratio of the adjustment reference voltage to the average capacitor voltage is a non-integer, the ratio can be rounded up and then added to the value obtained as the input quantity. For example, if the ratio is 10.4, the corresponding input quantity can be 11.

[0084] The above scheme adjusts the ratio of the reference voltage to the average capacitor voltage to determine the input quantity, so that the input quantity matches the actual operating state of the energy storage valve, thereby improving the accuracy of the input quantity.

[0085] See also Figure 8 , in some embodiments, step 406 includes step 802 and step 804 .

[0086] Step 802: When the number of faults is greater than the actual number of redundancy, the energy storage valve is controlled to stop operating.

[0087] Step 804: When the number of faults is less than or equal to the actual redundancy number, the energy storage valve is maintained in operation.

[0088] Specifically, in the same energy storage valve, the energy storage valve submodule is divided into an energy storage valve submodule that can be put into operation and a faulty energy storage valve submodule. The energy storage valve submodule that can be put into operation further includes an energy storage valve submodule that needs to be put into operation and a redundant energy storage valve submodule. If the number of faults is greater than the actual redundant number, that is, the faulty energy storage valve submodule has more redundant energy storage valve submodules, then it means that in the same energy storage valve, the number of energy storage valve submodules that can be put into operation is less than the number of energy storage valve submodules that need to be put into operation. Therefore, even if all the energy storage valve submodules that can be put into operation are put into operation, the operation requirements cannot be met. Therefore, when it is detected that the number of faults is greater than the actual redundant number, the energy storage valve is directly controlled to stop operating.

[0089] If the number of faults is less than or equal to the actual redundant number, it means that the number of faulty submodules in the same energy storage valve is small, and the number of energy storage valve submodules that can be put into operation can be consistent with the number of energy storage valve submodules that need to be put into operation (there are no redundant energy storage valve submodules at this time); or the number of energy storage valve submodules that can be put into operation is greater than the number of energy storage valve submodules that need to be put into operation (there are redundant energy storage valve submodules at this time). Therefore, when it is detected that the number of faults is less than or equal to the actual redundant number, the energy storage valve can be maintained in operation.

[0090] The above scheme controls the energy storage valve to maintain operation or stop operation based on the number of faults and the actual redundancy number, so that the energy storage valve operates in a state where the number of faults is less than the actual redundancy number, thereby improving the operating reliability of the energy storage valve.

[0091] See also Fig. 9 In some embodiments, step 402 includes step 902 and step 904 .

[0092] Step 902, obtaining the bypass quantity of the energy storage valve submodule in the bypass state in the energy storage valve.

[0093] Step 904: determine the number of faulty energy storage valve submodules according to the number of bypasses.

[0094] Specifically, during the operation of the energy storage system, if the energy storage valve submodule fails, the corresponding energy storage valve submodule will be bypassed through the energy storage valve controller, that is, the final state of the faulty energy storage valve submodule in the energy storage valve is the bypass state. Therefore, the energy storage valve controller can determine the number of faults of the faulty energy storage valve submodule based on the number of bypasses of the energy storage valve submodule in the bypass state. Specifically, the energy storage valve controller obtains the number of bypasses based on historical switching control instructions, etc., and uses the number of bypasses as the number of faults.

[0095] The above scheme determines the number of faults based on the number of bypasses of the energy storage valve submodules in the bypass state in the energy storage valve, and has the advantages of high fault determination efficiency and accuracy.

[0096] In order to understand the technical solution of this application, please refer to Fig.10 , the present application is explained below in conjunction with more detailed embodiments.

[0097] In the solution of this embodiment, the energy storage valve is connected to the high-voltage direct current energy storage system. First, the energy storage valve controller obtains the number of energy storage valve submodules in the bypass state of the energy storage valve at this time according to the historical switching control instructions of the current energy storage valve, and uses this as the number of faults of the faulty energy storage valve submodule. The energy storage valve controller communicates with the voltage detector (which can be a voltage transformer) set on the DC bus to obtain the adjustment reference voltage (DC bus voltage) in real time, and communicates with the voltage detector of the DC support capacitor set on each energy storage valve submodule that can be put into operation (energy storage valve submodules other than the faulty energy storage valve submodule) to obtain the capacitor voltage in real time.

[0098] The energy storage valve controller then combines the voltages of each capacitor to calculate the mean value and obtains the equalizing voltage required for the energy storage valve submodule to operate, that is, the average capacitor voltage. The energy storage valve controller compares the adjusted reference voltage with the average capacitor voltage and uses the ratio of the two to obtain the number of energy storage valve submodules required to be invested, and uses the difference between the total number of energy storage valve submodules in the energy storage valve and the number of invested modules as the actual redundant number of redundant energy storage valve submodules.

[0099] Finally, the energy storage valve controller dynamically updates the number of redundant energy storage valve submodules in the current energy storage valve in real time based on the calculated actual redundancy number. When the energy storage valve controller analyzes that the number of faults is greater than the actual redundancy number, the energy storage valve is controlled to stop operating. When the number of faults analyzed is less than or equal to the actual redundancy number, the energy storage valve is maintained in operation.

[0100] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0101] Based on the same inventive concept, the embodiment of the present application also provides an energy storage valve operation device for implementing the energy storage valve operation method involved above. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above method, so the specific limitations in one or more energy storage valve operation device embodiments provided below can refer to the limitations of the energy storage valve operation method above, and will not be repeated here.

[0102] See also Fig.11 , a storage valve operating device includes a fault acquisition module 112, a redundancy analysis module 114 and an operation control module 116.

[0103] The fault acquisition module 112 is used to obtain the fault number of the faulty energy storage valve submodule in the energy storage valve; the redundancy analysis module 114 is used to update the actual redundancy number of the redundant energy storage valve submodule in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve; the operation control module 116 is used to control the operation of the energy storage valve according to the actual redundancy number and the number of faults.

[0104] In some embodiments, the redundancy analysis module 114 is also used to obtain in real time the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, and the adjustment reference voltage at both ends of the energy storage valve; determine the average capacitor voltage based on the capacitor voltage; determine the actual redundant number of redundant energy storage valve submodules based on the adjustment reference voltage and the average capacitor voltage.

[0105] In some embodiments, the redundancy analysis module 114 is also used to obtain the total number of energy storage valve submodules in the energy storage valve; determine the number of energy storage valve submodules that need to be put into operation based on the adjusted reference voltage and the average capacitor voltage; and determine the actual redundant number of redundant energy storage valve submodules based on the total number and the number of inputs.

[0106] In some embodiments, the redundancy analysis module 114 is further used to determine the number of energy storage valve submodules that need to be put into operation according to the ratio of the adjusted reference voltage to the average capacitor voltage.

[0107] In some embodiments, the operation control module 116 is further configured to control the energy storage valve to shut down when the number of faults is greater than the actual redundancy number; and to maintain the energy storage valve to operate when the number of faults is less than or equal to the actual redundancy number.

[0108] In some embodiments, the fault acquisition module 112 is further used to acquire the bypass quantity of the energy storage valve submodule in the bypass state in the energy storage valve; and determine the fault quantity of the faulty energy storage valve submodule according to the bypass quantity.

[0109] The above-mentioned energy storage valve operation device can update the actual redundant number of redundant energy storage valve submodules in the current energy storage valve in real time during operation according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of each energy storage valve submodule that can be put into operation in the energy storage valve. Finally, the operation of the energy storage valve is controlled in combination with the actual redundant number and the number of failures of the faulty energy storage valve submodule. Through the above scheme, the actual redundant number of redundant energy storage valve submodules can be updated in real time during the operation of the energy storage valve, and the operation of the energy storage valve can be controlled by the actual redundant number. Reduce the possibility of the energy storage valve being shut down due to changes in the number of redundant energy storage valve submodules, and alleviate the problem that the energy storage valve is easily shut down due to redundant energy storage valve submodules.

[0110] In one embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Fig.12 As shown. The computer device includes a processor, a memory and a network interface connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store relevant data during the operation of the energy storage valve. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for operating an energy storage valve is implemented.

[0111] Those skilled in the art will understand that Fig.12 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0112] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0113] The fault number of the faulty energy storage valve submodule in the energy storage valve is obtained; the actual redundant number of the redundant energy storage valve submodule is updated in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve; the operation of the energy storage valve is controlled according to the actual redundant number and the fault number.

[0114] In one embodiment, when the processor executes the computer program, the following steps are also implemented: obtaining in real time the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, and the adjustment reference voltage at both ends of the energy storage valve; determining the average capacitor voltage based on the capacitor voltage; determining the actual redundant number of redundant energy storage valve submodules based on the adjustment reference voltage and the average capacitor voltage.

[0115] In one embodiment, when the processor executes the computer program, the following steps are also implemented: obtaining the total number of energy storage valve submodules in the energy storage valve; determining the number of energy storage valve submodules that need to be put into operation based on the adjusted reference voltage and the average capacitor voltage; and determining the actual redundant number of redundant energy storage valve submodules based on the total number and the number of inputs.

[0116] In one embodiment, when the processor executes the computer program, the following steps are further implemented: according to the ratio of the adjusted reference voltage to the average capacitor voltage, the number of energy storage valve submodules required to be put into operation is determined.

[0117] In one embodiment, when the processor executes the computer program, the following steps are also implemented: when the number of faults is greater than the actual redundant number, the energy storage valve is controlled to stop operating; when the number of faults is less than or equal to the actual redundant number, the energy storage valve is maintained in operation.

[0118] In one embodiment, when the processor executes the computer program, the following steps are further implemented: obtaining the bypass number of the energy storage valve submodule in the bypass state in the energy storage valve; and determining the fault number of the faulty energy storage valve submodule according to the bypass number.

[0119] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0120] The fault number of the faulty energy storage valve submodule in the energy storage valve is obtained; the actual redundant number of the redundant energy storage valve submodule is updated in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve; the operation of the energy storage valve is controlled according to the actual redundant number and the fault number.

[0121] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, and the adjustment reference voltage at both ends of the energy storage valve; determining the average capacitor voltage based on the capacitor voltage; determining the actual redundant number of redundant energy storage valve submodules based on the adjustment reference voltage and the average capacitor voltage.

[0122] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the total number of energy storage valve submodules in the energy storage valve; determining the number of energy storage valve submodules that need to be put into operation based on the adjusted reference voltage and the average capacitor voltage; and determining the actual redundant number of redundant energy storage valve submodules based on the total number and the number of inputs.

[0123] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: according to the ratio of the adjusted reference voltage to the average capacitor voltage, the number of energy storage valve submodules required to be put into operation is determined.

[0124] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: when the number of faults is greater than the actual redundant number, the energy storage valve is controlled to stop operating; when the number of faults is less than or equal to the actual redundant number, the energy storage valve is maintained in operation.

[0125] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the bypass number of the energy storage valve submodule in the bypass state in the energy storage valve; and determining the fault number of the faulty energy storage valve submodule according to the bypass number.

[0126] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0127] The fault number of the faulty energy storage valve submodule in the energy storage valve is obtained; the actual redundant number of the redundant energy storage valve submodule is updated in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve; the operation of the energy storage valve is controlled according to the actual redundant number and the fault number.

[0128] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining in real time the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, and the adjustment reference voltage at both ends of the energy storage valve; determining the average capacitor voltage based on the capacitor voltage; determining the actual redundant number of redundant energy storage valve submodules based on the adjustment reference voltage and the average capacitor voltage.

[0129] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the total number of energy storage valve submodules in the energy storage valve; determining the number of energy storage valve submodules that need to be put into operation based on the adjusted reference voltage and the average capacitor voltage; and determining the actual redundant number of redundant energy storage valve submodules based on the total number and the number of inputs.

[0130] In one embodiment, when the computer program is executed by the processor, the following steps are further implemented: according to the ratio of the adjusted reference voltage to the average capacitor voltage, the number of energy storage valve submodules required to be put into operation is determined.

[0131] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: when the number of faults is greater than the actual redundant number, the energy storage valve is controlled to stop operating; when the number of faults is less than or equal to the actual redundant number, the energy storage valve is maintained in operation.

[0132] In one embodiment, when the computer program is executed by the processor, the following steps are also implemented: obtaining the bypass number of the energy storage valve submodule in the bypass state in the energy storage valve; and determining the fault number of the faulty energy storage valve submodule according to the bypass number.

[0133] The above-mentioned computer device, storage medium and computer program product can, during operation, update the actual redundant number of redundant energy storage valve submodules in the current energy storage valve in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of each energy storage valve submodule that can be put into operation in the energy storage valve. Finally, the operation of the energy storage valve is controlled in combination with the actual redundant number and the number of failures of the faulty energy storage valve submodule. Through the above scheme, the actual redundant number of redundant energy storage valve submodules can be updated in real time during the operation of the energy storage valve, and the operation of the energy storage valve can be controlled by the actual redundant number. Reduce the possibility of the energy storage valve being shut down due to changes in the number of redundant energy storage valve submodules, and alleviate the problem that the energy storage valve is easily shut down due to redundant energy storage valve submodules.

[0134] See also Figure 1 The embodiment of the present application also provides an energy storage system, including a converter valve (specifically, a voltage source converter valve 102), an energy storage valve controller (not shown) and an energy storage valve 104, the converter valve is connected to the energy storage valve 104, the energy storage valve controller is connected to the energy storage valve 104, and the energy storage valve controller is used to execute the steps of the above-mentioned energy storage valve operation method.

[0135] Specifically, the energy storage valve operation method is as shown in the above embodiments and the accompanying drawings, and will not be repeated here. The energy storage system can be a high-voltage direct current energy storage system, and the energy storage valve 104 is connected to the converter valve through a DC bus (i.e., Vd+ and Vd- shown in the figure). During the operation of the energy storage system, the actual redundant number of redundant energy storage valve submodules in the current energy storage valve can be updated in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of each energy storage valve submodule that can be put into operation in the energy storage valve. Finally, the operation of the energy storage valve is controlled in combination with the actual redundant number and the number of failures of the faulty energy storage valve submodule. Through the above scheme, the actual redundant number of redundant energy storage valve submodules can be updated in real time during the operation of the energy storage valve, and the operation of the energy storage valve is controlled by the actual redundant number. Reduce the possibility of the energy storage valve being shut down due to changes in the number of redundant energy storage valve submodules, and alleviate the problem that the energy storage valve is easily shut down due to redundant energy storage valve submodules.

[0136] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 operating an energy storage valve, characterized in that: include: Obtain the fault number of the faulty energy storage valve submodule in the energy storage valve; According to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, the actual redundant number of the redundant energy storage valve submodule is updated in real time; The energy storage valve is controlled to operate according to the actual redundancy quantity and the failure quantity.

2. The energy storage valve operation method according to claim 1, characterized in that: The actual redundant number of redundant energy storage valve submodules is updated in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, including: Real-time acquisition of the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve, and the adjustment reference voltage at both ends of the energy storage valve; Determining an average capacitor voltage based on the capacitor voltage; The actual redundant number of the redundant energy storage valve submodules is determined according to the adjustment reference voltage and the average capacitor voltage.

3. The energy storage valve operation method according to claim 2, characterized in that: The determining, according to the adjustment reference voltage and the average capacitor voltage, an actual redundant number of redundant energy storage valve submodules comprises: Obtain the total number of energy storage valve submodules in the energy storage valve; Determining the number of energy storage valve submodules that need to be put into operation according to the adjustment reference voltage and the average capacitor voltage; The actual redundant quantity of the redundant energy storage valve submodules is determined according to the total quantity and the input quantity.

4. The energy storage valve operation method according to claim 3, characterized in that: The step of determining the number of energy storage valve submodules to be put into operation according to the adjustment reference voltage and the average capacitor voltage includes: The number of energy storage valve submodules that need to be put into operation is determined according to the ratio of the adjustment reference voltage to the average capacitor voltage.

5. The energy storage valve operation method according to any one of claims 1 to 4, characterized in that: The step of controlling the operation of the energy storage valve according to the actual redundancy quantity and the fault quantity includes: When the number of faults is greater than the actual redundancy number, controlling the energy storage valve to stop operating; When the fault quantity is less than or equal to the actual redundant quantity, the energy storage valve is maintained in operation.

6. The energy storage valve operation method according to any one of claims 1 to 5, characterized in that: The obtaining of the number of faults of the faulty energy storage valve submodule in the energy storage valve includes: Obtain the bypass quantity of the energy storage valve submodule in the bypass state in the energy storage valve; The number of failures of the failed energy storage valve submodule is determined according to the number of bypasses.

7. A storage valve operating device, characterized in that: include: A fault acquisition module, used to acquire the fault quantity of the faulty energy storage valve submodule in the energy storage valve; A redundancy analysis module, used to update the actual redundancy number of redundant energy storage valve submodules in real time according to the adjustment reference voltage at both ends of the energy storage valve and the capacitor voltage of the energy storage valve submodule that can be put into operation in the energy storage valve; An operation control module is used to control the operation of the energy storage valve according to the actual redundancy quantity and the failure quantity.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the energy storage valve operation method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the energy storage valve operation method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the energy storage valve operation method described in any one of claims 1 to 6 are implemented.

11. An energy storage system, characterized in that: It includes a flow converter valve, a storage valve controller and a storage valve, wherein the flow converter valve is connected to the storage valve, the storage valve controller is connected to the storage valve, and the storage valve controller is used to execute the steps of the storage valve operation method according to any one of claims 1 to 6.

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