Information control method and device, electronic equipment and storage medium

Abstract

The invention provides an information control method and device, electronic equipment and a storage medium, and relates to the technical field of batteries. According to the method, under the condition that it is determined that the energy storage valve module has the sub-module bypass, the relevant parameters of the energy storage valve module are obtained, and then the operation state of the energy storage valve module is controlled according to the relevant parameters, so that the energy storage valve module can be subjected to shutdown maintenance without the sub-module bypass, and the maintenance efficiency is improved. The operation state of the energy storage valve module is controlled according to the relevant parameters, the utilization rate of the energy storage valve module can be effectively improved, and resources are saved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an information control method, device, electronic device and storage medium. Background Art

[0002] Energy storage technology is widely used because it can improve the utilization rate of renewable energy power generation, smooth active power fluctuations, and play a role in peak load reduction and valley filling in power systems. Among them, the direct-mounted energy storage power conversion system has the advantages of modular structure and high safety, and has received widespread attention in high-voltage and large-capacity occasions. The quality of its control strategy directly affects the performance and reliability of the energy storage system.

[0003] In a high-voltage direct current transmission system composed of an energy storage valve and a converter valve, when some sub-modules in the energy storage valve module fail and the bypass cannot be used, if the system continues to operate, the DC inter-pole current will rise rapidly due to the coordinated control of the valves, which can easily cause overcurrent damage to the device. Therefore, in order to avoid overcurrent damage to the device, the current practice is to directly shut down the energy storage valve module for maintenance. However, this method will cause the sub-modules without bypass to be idle, resulting in a waste of resources and reducing the utilization rate of the energy storage valve. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide an information control method, device, electronic device and storage medium, so as to improve the problem in the prior art that the energy storage valve module is shut down for maintenance when a submodule bypass occurs, resulting in waste of resources and low utilization rate of the energy storage valve.

[0005] In a first aspect, an embodiment of the present application provides an information control method, the method comprising:

[0006] When it is determined that there is a submodule bypass in the energy storage valve module, obtaining relevant parameters of the energy storage valve module;

[0007] The operating state of the energy storage valve module is controlled according to the relevant parameters.

[0008] In the above implementation process, by determining that there is a sub-module bypass in the energy storage valve module, the relevant parameters of the energy storage valve module are obtained, and then the operation state of the energy storage valve module is controlled according to the relevant parameters. In this way, there is no need to shut down the energy storage valve module for maintenance when the sub-module is bypassed. Instead, the operation state of the energy storage valve module is controlled according to the relevant parameters, which can effectively improve the utilization rate of the energy storage valve module and save resources.

[0009] Optionally, the relevant parameters include the number of remaining available submodules in the energy storage valve module; and controlling the operating state of the energy storage valve module according to the relevant parameters includes:

[0010] When the number of remaining available submodules does not exceed the lower limit of the number of safe operation submodules, the energy storage valve module is controlled to stop operating.

[0011] In the above implementation process, if the number of remaining available sub-modules does not exceed the lower limit of the number of safe operating sub-modules, it indicates that if the energy storage valve module continues to operate, it may cause overcurrent damage to the device. Therefore, in this case, the energy storage valve module is shut down to protect the device.

[0012] Optionally, the relevant parameters include the number of remaining available submodules in the energy storage valve module and the maximum bus voltage that the energy storage valve module can provide; and controlling the operating state of the energy storage valve module according to the relevant parameters includes:

[0013] When the number of remaining available submodules exceeds the lower limit of the number of safe-operating submodules and the maximum bus voltage does not exceed the safe lower limit of the DC bus voltage, the energy storage valve module is controlled to stop operating.

[0014] In the above implementation process, in this case, shutting down the energy storage valve module can effectively protect the device.

[0015] Optionally, under the discharge condition, the relevant parameters include the number of remaining available submodules in the energy storage valve module and the maximum bus voltage that the energy storage valve can provide; and controlling the operating state of the energy storage valve module according to the relevant parameters includes:

[0016] When the number of remaining available submodules exceeds the lower limit of the number of safe operation submodules and the maximum bus voltage exceeds the safety lower limit of the DC bus voltage, obtaining a current correction value;

[0017] When the current correction value exceeds the safe operation limit of the DC bus current, the energy storage valve module is controlled to stop operating.

[0018] In the above implementation process, whether to shut down the energy storage valve module is comprehensively judged based on the number of remaining available sub-modules, the maximum bus voltage and the current, so that the operating status of the energy storage valve module can be further judged to maximize the utilization rate of the energy storage valve module.

[0019] Optionally, obtaining the current correction value includes:

[0020] Determining whether the maximum bus voltage exceeds the rated value of the DC bus voltage;

[0021] If it exceeds, a current correction value is calculated based on the DC bus voltage rated value and the remaining available submodule quantity;

[0022] If it does not exceed, the current correction value is calculated based on the DC bus voltage safety lower limit and the remaining available sub-module quantity.

[0023] In the above implementation process, different current correction values ​​are obtained in different situations, so as to obtain the maximum current that the energy storage valve module can withstand during operation in different situations, thereby improving the utilization rate of the energy storage valve module.

[0024] Optionally, when the number of remaining available submodules exceeds the lower limit of the number of safe operation submodules and the maximum bus voltage exceeds the DC bus voltage safety lower limit, the method further includes:

[0025] Get voltage correction value;

[0026] When the current correction value does not exceed the safe operation limit of the DC bus, the voltage of the energy storage valve module is controlled according to the voltage correction value.

[0027] In the above implementation process, when the energy storage valve module can continue to operate, the voltage correction value is used to control the voltage of the energy storage valve module to perform voltage reduction protection on the energy storage valve module so that it can continue to operate safely.

[0028] Optionally, obtaining the voltage correction value includes:

[0029] In a case where the maximum bus voltage exceeds the rated value of the DC bus voltage, determining the rated value of the DC bus voltage as the voltage correction value;

[0030] When the maximum bus voltage does not exceed the rated value of the DC bus voltage, the DC bus voltage safety lower limit is determined as the voltage correction value.

[0031] In the above implementation process, different voltage correction values ​​are determined in different situations to control the energy storage valve module to continue to operate at a suitable voltage, thereby improving the utilization rate of the energy storage valve module while also ensuring that the energy storage valve module can continue to operate safely.

[0032] Optionally, the voltage control of the energy storage valve module according to the voltage correction value includes:

[0033] Acquire a voltage correction rate according to the voltage correction value and the initial voltage;

[0034] The voltage of the energy storage valve module is controlled according to the voltage correction rate.

[0035] In the above implementation process, the voltage of the energy storage valve module is controlled according to the voltage correction rate, so that the voltage of the energy storage valve module can be slowly controlled to reduce the problem of unstable operation of the device due to excessive voltage changes in the device in a short period of time caused by excessive correction rate.

[0036] Optionally, the voltage control of the energy storage valve module according to the voltage correction rate includes:

[0037] Determine a voltage correction rate range within which the voltage correction rate falls;

[0038] The energy storage valve module is controlled to reduce voltage according to the voltage correction rate corresponding to the voltage correction rate range.

[0039] In the above implementation process, different voltage correction rate ranges are used to constrain the current voltage correction rate, so that a suitable voltage correction rate can be selected to control the voltage drop of the energy storage valve module to reduce the impact of excessive voltage adjustment rate on the device.

[0040] Optionally, after obtaining the voltage correction rate according to the voltage correction value and the initial voltage, the method further includes:

[0041] If the voltage correction rate is less than the set threshold, an alarm message is output.

[0042] In the above implementation process, the voltage correction rate is too small, indicating that the voltage adjustment range is large. Thus, a large voltage reduction control on the energy storage valve module may affect its operation, so an alarm message is output to prompt the staff to perform manual intervention.

[0043] Optionally, when the current correction value does not exceed the safe operation limit of the DC bus, the method further includes:

[0044] Obtaining a power correction value according to the current correction value and the voltage correction value;

[0045] The power of the converter valve module is controlled according to the power correction value.

[0046] In the above implementation process, when the energy storage valve module continues to operate, under the influence of coordinated control, the power of the converter valve module can also be controlled to reduce the risk of greater overcurrent in the converter valve module.

[0047] Optionally, under the charging condition, the relevant parameters include the number of remaining available submodules in the energy storage valve module and the maximum bus voltage that can be provided by the energy storage valve; the method further includes:

[0048] When the number of remaining available submodules exceeds the lower limit of the number of safe operating submodules and the maximum bus voltage exceeds the safety lower limit of the DC bus voltage, a power correction value is determined based on the maximum bus voltage;

[0049] The power of the converter valve module is controlled according to the power correction value.

[0050] In the above implementation process, a suitable power correction value is obtained based on the maximum bus voltage to ensure reasonable power control of the converter valve module.

[0051] Optionally, determining the power correction value based on the maximum bus voltage includes:

[0052] Determining whether the maximum bus voltage exceeds the rated value of the DC bus voltage;

[0053] If not, obtaining a power correction value based on the DC bus voltage safety lower limit and the DC bus current safety operation limit;

[0054] If it exceeds, a power correction value is obtained based on the DC bus voltage rated value and the DC bus current safe operation limit value.

[0055] In the above implementation process, different power correction values ​​are determined under different circumstances to control the converter valve module to continue to operate at a suitable power, thereby ensuring that the converter valve module can continue to operate safely.

[0056] Optionally, performing power control on the converter valve module according to the power correction value includes:

[0057] Acquire a power correction rate according to the power correction value and the initial power;

[0058] The power of the converter valve module is controlled according to the power correction rate.

[0059] In the above implementation process, the power of the converter valve module is controlled according to the power correction rate, so that the power of the converter valve module can be slowly controlled to reduce the problem of unstable operation of the device due to excessive power changes in the device in a short period of time caused by excessive adjustment amplitude.

[0060] Optionally, the performing power control on the converter valve module according to the power correction rate includes:

[0061] Determining a power correction range within which the power correction rate lies;

[0062] The power reduction control of the converter valve module is performed according to the power correction rate corresponding to the power correction range.

[0063] In the above implementation process, different power correction rate ranges are used to constrain the current power correction rate, so that a suitable power correction rate can be selected to perform power reduction control on the converter valve module to reduce the impact of excessive power adjustment on the device.

[0064] Optionally, after obtaining the power correction rate according to the power correction value and the initial power, the method further includes:

[0065] If the power correction rate is less than a set threshold, an alarm message is output.

[0066] In the above implementation process, the power correction rate is too small, indicating that the power adjustment range is large. Thus, a large power reduction control on the converter valve module may affect its operation, so an alarm message is output to prompt the staff to perform manual intervention.

[0067] In a second aspect, an embodiment of the present application provides an information control method, the method comprising:

[0068] For each phase energy storage valve module in the power transmission system, the information control method provided in the first aspect is executed;

[0069] When it is determined that the first-phase energy storage valve module needs to stop running, the remaining phase energy storage valve modules in the power transmission system except the first-phase energy storage valve module are controlled to stop running, and the first-phase energy storage valve module is any phase energy storage valve module of the power transmission system.

[0070] In a third aspect, an embodiment of the present application provides an information control device, the device comprising:

[0071] A parameter acquisition module, used to acquire relevant parameters of the energy storage valve module when it is determined that a submodule bypass exists in the energy storage valve module;

[0072] The control module is used to control the operating state of the energy storage valve module according to the relevant parameters.

[0073] In a fourth aspect, an embodiment of the present application provides an information control device, the device comprising:

[0074] An information control module, used to execute the information control method provided in the first aspect for each phase energy storage valve module in the power transmission system;

[0075] When it is determined that the first-phase energy storage valve module needs to stop running, the remaining phase energy storage valve modules in the power transmission system except the first-phase energy storage valve module are controlled to stop running, and the first-phase energy storage valve module is any phase energy storage valve module of the power transmission system.

[0076] In a fifth aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect are executed.

[0077] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the method provided in the first aspect are performed.

[0078] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0080] Figure 1 A schematic diagram of the structure of an MMC type energy storage valve provided in an embodiment of the present application;

[0081] Figure 2 A schematic structural diagram of a DC direct-hung energy storage valve provided in an embodiment of the present application;

[0082] Figure 3 A schematic diagram of the structure of an AC direct-mounted energy storage valve provided in an embodiment of the present application;

[0083] Figure 4 A flowchart of an information control method provided in an embodiment of the present application;

[0084] Figure 5 A schematic structural diagram of an energy storage valve module provided in an embodiment of the present application;

[0085] Figure 6 A schematic diagram of a current charging path of a submodule of an energy storage valve module provided in an embodiment of the present application;

[0086] Figure 7 A schematic diagram of a current discharge path of a submodule of an energy storage valve module provided in an embodiment of the present application;

[0087] Figure 8A schematic structural diagram of a power transmission system including an energy storage valve module and a converter valve module provided in an embodiment of the present application;

[0088] Fig. 9 An overall flow chart of an information control method under discharge conditions provided in an embodiment of the present application;

[0089] Fig.10 A structural block diagram of an information control device provided in an embodiment of the present application;

[0090] Fig.11 A schematic diagram of the structure of an electronic device for executing an information control method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0091] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present application.

[0092] It should be noted that the terms "system" and "network" in the embodiments of the present invention can be used interchangeably. "Multiple" means two or more. In view of this, in the embodiments of the present invention, "multiple" can also be understood as "at least two". "And / or" describes 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 at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previously associated objects are in an "or" relationship.

[0093] In some power transmission systems, there are many types of energy storage valve modules, such as Figure 1 (MMC type energy storage valve), Figure 2 (DC direct-hung energy storage valve) and Figure 3 As shown in (AC direct-mounted energy storage converter valve), the energy storage valve module usually includes multiple sub-modules, and the multiple sub-modules are cascaded. When some sub-modules in the energy storage valve module fail and the bypass cannot be used, if it continues to operate, the DC inter-pole current will rise rapidly due to the influence of valve coordinated control, which can easily cause over-current damage to the device. Therefore, in order to avoid over-current damage to the device, the current practice is to directly shut down the energy storage valve module for maintenance. However, this method will cause the sub-modules without bypass to be idle, resulting in resource waste and reducing the utilization rate of the energy storage valve.

[0094] Therefore, an embodiment of the present application proposes an information control method, which obtains relevant parameters of the energy storage valve module when it is determined that a sub-module bypass exists in the energy storage valve module, and then controls the operating state of the energy storage valve module according to the relevant parameters. In this way, there is no need to shut down the energy storage valve module for maintenance when the sub-module bypasses, but the operating state of the energy storage valve module is controlled according to the relevant parameters, which can effectively improve the utilization rate of the energy storage valve module and save resources.

[0095] Please refer to Figure 4 , Figure 4 A flowchart of an information control method provided in an embodiment of the present application, the method comprising the following steps:

[0096] Step S110: when it is determined that the energy storage valve module has a submodule bypass, obtain relevant parameters of the energy storage valve module.

[0097] The executor of the information control method provided in the embodiment of the present application may be a valve controller. The energy storage valve module includes multiple sub-modules, each of which may correspond to a sub-module controller. The sub-module controller may be used to control the operating status of the corresponding sub-module and collect relevant information of the sub-module and report it to the valve controller. For example, each sub-module controller may detect the operating status of the corresponding sub-module in real time or at a set time interval. When it is detected that a sub-module is bypassed due to a fault, the sub-module controller will send a prompt message to the valve controller indicating that the corresponding sub-module is bypassed. In this way, the valve controller can know whether there is a sub-module in the energy storage valve module that is bypassed.

[0098] Therefore, after receiving the prompt information sent by at least one submodule controller to prompt the submodule bypass, the valve controller can determine that the energy storage valve module has a submodule bypass, and then obtain the relevant parameters of the energy storage valve module.

[0099] In some embodiments, in order to reduce the waste of control resources caused by frequent control, when it is determined that there is a sub-module bypass in the energy storage valve module, the number of bypassed sub-modules can be obtained. If the number of bypassed sub-modules exceeds the set number, the relevant parameters of the energy storage valve module are obtained.

[0100] That is to say, in this method, the valve controller does not necessarily obtain relevant parameters to control the operating status of the energy storage valve module as soon as it receives a prompt message sent by one of the sub-module controllers to prompt the sub-module to bypass. The valve controller may obtain relevant parameters to control the operating status of the energy storage valve only after receiving prompt messages exceeding a set number.

[0101] It can be understood that the set number here can be flexibly set according to actual conditions. For example, if it is set to 3, it means that if the number of bypass sub-modules exceeds 3 and the operating state of the energy storage valve module is not controlled, it may cause a certain impact on the entire power transmission system. Therefore, if the number of bypass sub-modules exceeds 3, relevant parameters are obtained to control the operating state of the energy storage valve module.

[0102] Among them, the relevant parameters can be understood as some working parameters of the energy storage valve module, that is, parameters that characterize the current operating parameters of the energy storage valve module, or they can also be parameters that characterize the current state of the energy storage valve module, such as the number of remaining available sub-modules in the energy storage valve module, the maximum bus voltage that the energy storage valve module can provide, and other parameters.

[0103] Step S120: Controlling the operating state of the energy storage valve module according to relevant parameters.

[0104] In the embodiments of the present application, the operating state of the energy storage valve module can be controlled according to relevant parameters. In some power transmission systems, other modules are also included, such as a converter valve module. The converter valve module and the energy storage valve module complete high-voltage direct current transmission through coordinated control. Therefore, in some embodiments, the operating state of other modules can also be controlled according to relevant parameters. Therefore, if the energy storage valve module does not stop running, in order to reduce the overcurrent damage of the device, the converter valve module can also be controlled to reduce power accordingly. The specific control process can be described in detail in subsequent embodiments, so I will not go into details here.

[0105] In the above implementation process, by determining that there is a sub-module bypass in the energy storage valve module, the relevant parameters of the energy storage valve module are obtained, and then the operation state of the energy storage valve module is controlled according to the relevant parameters. In this way, there is no need to shut down the energy storage valve module for maintenance when the sub-module is bypassed. Instead, the operation state of the energy storage valve module is controlled according to the relevant parameters, which can effectively improve the utilization rate of the energy storage valve module and save resources.

[0106] The following first describes the situation where the energy storage valve module needs to be shut down for maintenance.

[0107] In case 1, the relevant parameters may include the number of remaining available sub-modules in the energy storage valve module. Then, the operating state of the energy storage valve module is controlled according to the relevant parameters, including: when the number of remaining available sub-modules does not exceed the lower limit of the number of safe operating sub-modules, the energy storage valve module is controlled to stop operating.

[0108] The lower limit of the number of safe operation submodules may be set based on the safe operation of the energy storage valve module in actual situations, and the corresponding value may be different in different power transmission systems.

[0109] As an example, if the lower limit of the number of safe operation submodules is 34, it means that if there are more than 34 submodules available, it is safe for the energy storage valve module to continue to operate. For example, the total number of submodules in the energy storage valve module is 38. If the number of available submodules is 33, which does not exceed the lower limit of the number of safe operation submodules, it means that it is unsafe for the energy storage valve module to continue to operate. In this case, the energy storage valve module is controlled to stop operating and needs to be repaired. After the repair, the energy storage valve module can be controlled to resume operation.

[0110] In the above implementation process, if the number of remaining available sub-modules does not exceed the lower limit of the number of safe operating sub-modules, it indicates that if the energy storage valve module continues to operate, it may cause overcurrent damage to the device. Therefore, in this case, the energy storage valve module is shut down to protect the device.

[0111] In case 2, the relevant parameters may include the number of remaining available sub-modules in the energy storage valve module and the maximum bus voltage that the energy storage valve module can provide. The operating state of the energy storage valve module is controlled according to the relevant parameters, including: when the number of remaining available sub-modules exceeds the lower limit of the number of safe operating sub-modules and the maximum bus voltage does not exceed the safe lower limit of the DC bus voltage, the energy storage valve module is controlled to stop operating.

[0112] For example, first determine whether the number of remaining available sub-modules exceeds the lower limit of the number of safe operating sub-modules. If so, it means that the energy storage valve module can continue to operate and does not need to be shut down for maintenance. Then continue to determine whether the maximum bus voltage exceeds the safe lower limit of the DC bus voltage. If not, it means that it is unsafe for the energy storage valve module to continue to operate and it needs to be shut down for maintenance.

[0113] Among them, the maximum bus voltage that the energy storage valve module can provide can be obtained by using different calculation formulas under different working conditions. It can be understood that in different power transmission systems, the structures of the submodules in the energy storage valve module are different. For example, in a DC direct-mounted energy storage valve, taking the half-bridge topology and the battery steady-state zero-order model as an example, the submodules in the energy storage valve module are composed in a cascade manner, such as Figure 5 As shown, according to this topology, under steady-state input, the port voltage of each submodule is:

[0114] u sm =OCV±I×R;

[0115] Among them, OCV represents the battery terminal voltage, I represents the current, R represents the battery internal resistance, and the "+" sign is displayed under charging conditions. The current charging path is as follows: Figure 6 As shown, the discharge condition is “—”, and the current discharge path is as follows Figure 7 shown.

[0116] Since the submodules are cascaded to form the energy storage valve module, the current passing through each submodule is the DC bus current I in steady state. dc (Ignore transmission line losses), that is, I = I dc .

[0117] From a system perspective, the DC bus voltage is supported by the sub-modules connected in series, namely:

[0118] U dc =N×U sm ;

[0119] According to the power conservation law, the input / output power of the converter valve module is:

[0120] P=η×U dc ×I dc ;

[0121] Where η is the power conversion efficiency of the converter valve module.

[0122] If some submodules in the energy storage valve module are bypassed, that is, N decreases, the DC bus voltage will decrease. After detecting the DC bus voltage drop, the converter valve module will control I dc This will cause the device to be exposed to a greater risk of overcurrent. In order to reduce this risk, the power of the converter valve module is controlled while the energy storage valve module continues to operate.

[0123] According to the above principle, the maximum bus voltage that the energy storage valve module can provide in the above example can be calculated. For example, under the discharge condition, the calculation formula is:

[0124] U′ dcmax =N on ×OCV;

[0125] Under charging conditions, the calculation formula is:

[0126] U′ dcmax =N on ×(OCV+(I dcmax -ΔI)×R);

[0127] Among them, U′ dcmax Indicates the maximum bus voltage, N on Indicates the number of remaining available submodules, OCV indicates the battery terminal voltage, I dcmax represents the safe operating limit of the DC bus current, ΔI represents the current margin, and R represents the internal resistance of the battery. The OCV in the above formula can be obtained through the voltage sensor deployed in the transmission system.

[0128] It should be noted that the calculation formula for the maximum bus voltage may be different in different energy storage valve structures.

[0129] In the above implementation process, in this case, shutting down the energy storage valve module can effectively protect the device.

[0130] Case 3: Under the discharge condition, the relevant parameters include the number of remaining available sub-modules in the energy storage valve module and the maximum bus voltage that the energy storage valve can provide. The operating state of the energy storage valve module is controlled according to the relevant parameters, including: when the number of remaining available sub-modules exceeds the lower limit of the number of safe operating sub-modules and the maximum bus voltage exceeds the safe lower limit of the DC bus voltage, the current correction value is obtained, and when the current correction value exceeds the safe operating limit of the DC bus current, the energy storage valve module is controlled to stop operating.

[0131] The method for obtaining the maximum bus voltage here is consistent with the method for obtaining in the above situation 2, and for the sake of brevity of description, it will not be repeated here.

[0132] It should be noted that when judging the number of remaining available submodules and the maximum bus voltage in Case 2 and Case 3, the judgment order may be to first judge whether the number of remaining available submodules exceeds the lower limit of the number of safe operation submodules, and if so, continue to judge whether the maximum bus voltage exceeds the DC bus voltage safety lower limit; or, it may be to first judge whether the maximum bus voltage exceeds the DC bus voltage safety lower limit, and if so, continue to judge whether the number of remaining available submodules exceeds the lower limit of the number of safe operation submodules; or, both may be judged in parallel. The judgment order is not particularly limited in the embodiments of the present application, and can be flexibly selected in practical applications.

[0133] After judging that the remaining available submodule data and the maximum bus voltage both indicate that the energy storage valve module can continue to operate, the current correction value is obtained for judgment. Because the submodule is bypassed, the voltage that the energy storage valve module can provide has changed, so its current has also changed. The current correction value refers to the current that the energy storage valve module can currently provide. The current correction value is used to further judge whether the energy storage valve module can continue to operate safely. If the current correction value exceeds the safe operation limit of the DC bus current, the energy storage valve module is controlled to stop operation for maintenance. On the contrary, if it does not exceed, the energy storage valve module can continue to operate.

[0134] In the above implementation process, whether to shut down the energy storage valve module is comprehensively judged based on the number of remaining available sub-modules, the maximum bus voltage and the current, so that the operating status of the energy storage valve module can be further judged to maximize the utilization rate of the energy storage valve module.

[0135] On the basis of the above embodiment, in the above situation 3, the current correction value can be obtained in the following manner: determine whether the maximum bus voltage exceeds the DC bus voltage rated value; if so, calculate the current correction value based on the DC bus voltage rated value and the remaining number of available sub-modules; if not, calculate the current correction value based on the DC bus voltage safety lower limit and the remaining number of available sub-modules.

[0136] Continuing to use the example in the above case 2 to calculate the current correction value, when the maximum bus voltage exceeds the rated value of the DC bus voltage, the current correction value is calculated using the following formula:

[0137]

[0138] When the maximum bus voltage does not exceed the rated value of the DC bus voltage, the current correction value is calculated using the following formula:

[0139]

[0140] Among them, U dcmin is the DC bus voltage safety lower limit, I′ dc is the current correction value, U dc is the rated value of the DC bus voltage, R is the internal resistance of the battery, and OCV is the battery terminal voltage.

[0141] It should be noted that different energy storage valve structures may have different calculation formulas for the current correction value. In actual situations, the calculation formula for the corresponding current correction value may be flexibly set according to the energy storage valve structure. The current correction values ​​obtained under different working conditions may also be different.

[0142] In the above implementation process, different current correction values ​​are obtained in different situations, so as to obtain the maximum current that the energy storage valve module can withstand during operation in different situations, thereby improving the utilization rate of the energy storage valve module.

[0143] It should be noted that in the above situation, when the energy storage valve module is controlled to operate, the valve controller can also output prompt information to the host computer to prompt the staff to adopt the corresponding control strategy to control the converter valve module. Or in this case, the valve controller can be pre-set with a control strategy for the converter valve module, and the converter valve module can be directly controlled according to the set control strategy. The control strategy can be flexibly set according to the actual situation, and different control strategies can be set in different engineering management.

[0144] The following describes the situation where the energy storage valve module does not need to be shut down for maintenance but continues to operate. First, the voltage control method of the energy storage valve module is described.

[0145] When the number of remaining available sub-modules exceeds the lower limit of the number of safe operation sub-modules and the maximum bus voltage exceeds the safe lower limit of the DC bus voltage, it also includes: obtaining a voltage correction value, and when the current correction value does not exceed the safe operation limit of the DC bus, controlling the voltage of the energy storage valve module according to the voltage correction value.

[0146] If the current correction value does not exceed the safe operation limit of the DC bus, it means that the energy storage valve module can continue to operate. However, in order to reduce the damage to the device caused by overvoltage, the voltage of the energy storage valve module can also be controlled according to the voltage correction value. The voltage correction value here can refer to the voltage to be achieved after the voltage of the energy storage valve module is controlled, that is, the voltage of the energy storage valve module is finally controlled to the voltage correction value.

[0147] In the above implementation process, when the energy storage valve module can continue to operate, the voltage correction value is used to control the voltage of the energy storage valve module to perform voltage reduction protection on the energy storage valve module so that it can continue to operate safely.

[0148] Based on the above embodiment, the voltage correction value is obtained as follows: when the maximum bus voltage exceeds the rated value of the DC bus voltage, the rated value of the DC bus voltage is determined as the voltage correction value, that is, U′ dc =U dc =N on ×(OCV-I′ dc ×R); when the maximum bus voltage does not exceed the rated value of the DC bus voltage, the DC bus voltage safety lower limit is determined as the voltage correction value, that is, U′ dc =U dcmin =N on ×(OCV-I′ dc ×R), where I′ dc is the current correction value mentioned above.

[0149] It should be noted that different energy storage valve structures may have different calculation formulas for the voltage correction value. In actual situations, the calculation formula for the corresponding voltage correction value may be flexibly set according to the energy storage valve structure.

[0150] In the above implementation process, different voltage correction values ​​are determined in different situations to control the energy storage valve module to continue to operate at a suitable voltage, thereby improving the utilization rate of the energy storage valve module while also ensuring that the energy storage valve module can continue to operate safely.

[0151] On the basis of the above embodiment, in order to ensure system stability, the method of controlling the voltage of the energy storage valve module according to the voltage correction value includes: obtaining a voltage correction rate according to the voltage correction value and the initial voltage, and then controlling the voltage of the energy storage valve module according to the voltage correction rate.

[0152] Among them, the initial voltage can be understood as the voltage of the energy storage valve module when there is no sub-module bypass, or it can be the rated DC voltage of the energy storage valve module. For example, in the power transmission system, the energy storage valve module is generally controlled by a fixed DC voltage. If the fixed value is 70KV, the initial voltage is 70KV.

[0153] The voltage correction rate is the ratio of the voltage correction value to the initial voltage, and the calculation formula is: Where X represents the voltage correction value, X' represents the initial voltage, and k represents the voltage correction rate.

[0154] Then the energy storage valve module can be corrected from the initial voltage to the voltage correction value according to the voltage correction rate. For example, if the voltage correction rate is 0.7, the unit of the voltage correction rate is pu (per unit value). In this way, the voltage of the energy storage valve module can be controlled to the voltage correction value at 0.7.pu per second to achieve voltage control of the energy storage valve module.

[0155] In the above implementation process, the voltage of the energy storage valve module is controlled according to the voltage correction rate, so that the voltage of the energy storage valve module can be slowly controlled to reduce the problem of unstable operation of the device due to excessive voltage changes in the device in a short period of time caused by excessive correction rate.

[0156] On the basis of the above embodiments, in order to further ensure the stability of the system, when the voltage of the energy storage valve module is controlled according to the voltage correction rate, the voltage correction rate range in which the voltage correction rate is located can be determined first, and then the energy storage valve module can be controlled to reduce the voltage according to the voltage correction rate corresponding to the voltage correction rate range.

[0157] For example, in some cases, the calculated voltage correction rate may be relatively large, but if the energy storage valve module is subjected to rapid voltage control, it may have a certain impact on the performance of the energy storage valve module. Therefore, a corresponding relationship between a voltage correction rate range and a voltage correction rate may be pre-set. For example, the voltage correction rate range is 0-ku1, and the corresponding voltage correction rate is kv1. The voltage correction rate range is ku1-ku2, and the corresponding voltage correction rate is kv2. The voltage correction rate range is above ku2, and the corresponding voltage correction rate is kv3, wherein kv1<kv2<kv3. After the voltage correction rate k is calculated and obtained in the above manner, the voltage correction rate range in which k is located may be determined first. For example, if the voltage correction rate range corresponding to k is within 0-ku1, then the voltage correction rate kv1 corresponding to the voltage correction rate range may be obtained to adjust the voltage of the energy storage valve module. When the voltage correction rate corresponding to the voltage correction rate range is set, the corresponding voltage correction rate is generally smaller.

[0158] It should be noted that, in practical applications, the correspondence between the voltage correction rate range and the voltage correction rate can be flexibly set, that is, the voltage correction rate corresponding to different voltage correction rate ranges can be set from the perspective of the stability of the power transmission system.

[0159] In the above implementation process, different voltage correction rate ranges are used to constrain the current voltage correction rate, so that a suitable voltage correction rate can be selected to control the voltage drop of the energy storage valve module to reduce the impact of excessive voltage adjustment rate on the device.

[0160] On the basis of the above embodiment, in order to ensure safety, after obtaining the voltage correction rate, the method may further include: if the voltage correction rate is less than a set threshold, outputting an alarm message.

[0161] It can be understood that if the voltage correction rate is too small, it means that the adjustment range of the voltage of the energy storage valve module is large, and a large adjustment of the voltage may affect the operation of the energy storage valve module. Therefore, an alarm message can be output to prompt the staff to participate in the verification and then determine whether the control strategy needs to be adjusted.

[0162] In the above implementation process, the voltage correction rate is too small, indicating that the voltage adjustment range is large. Thus, a large voltage reduction control on the energy storage valve module may affect its operation, so an alarm message is output to prompt the staff to perform manual intervention.

[0163] In the power transmission system, it is generally composed of a storage valve module and a converter valve module, which completes the power transmission through a coordinated control method, such as Figure 8 As shown in the figure, the energy storage valve module and the converter valve module together constitute a flexible DC transmission system. Therefore, at both ends of the transmission system, one physical quantity from the active power type and the reactive power type must be selected for control to maintain the stability of the system. At the same time, one end of the energy storage valve module and the converter valve module must control the DC side voltage. In engineering, the energy storage valve module is often used to determine the DC side voltage operation, and the converter valve module is used to determine the AC side active power operation, so as to achieve coordinated control.

[0164] Therefore, if there is a submodule bypass in the energy storage valve module, after determining that the energy storage valve module continues to operate based on the judgment method in the above embodiment, the voltage of the energy storage valve module is controlled, and in order to ensure the stable operation of the power transmission system, the power of the converter valve module is also controlled.

[0165] When power control is performed on the converter valve module, under discharge conditions, when the current correction value does not exceed the safe operating limit of the DC bus, a power correction value is obtained based on the current correction value and the voltage correction value, and then power control of the converter valve module is performed based on the power correction value.

[0166] The calculation formula of power correction value is as follows:

[0167] P′ ref =η×U′ dc ×I′ dc ;

[0168] Among them, P′ ref represents the power correction value, η represents the power conversion efficiency. This is because when the active power on the DC side is converted to the AC side through the converter valve module, it will be lost through the converter valve module. Therefore, the power conversion efficiency needs to be considered. U′ dc is the voltage correction value under discharge conditions, I′ dc It is the current correction value under discharge condition.

[0169] After the power correction value is obtained, the power correction value can be used to perform power reduction control on the converter valve module, such as controlling the power of the converter valve module to the power correction value, thereby achieving power control.

[0170] In the above implementation process, when the energy storage valve module continues to operate, under the influence of the coordinated control, the power of the converter valve module can also be controlled to reduce the risk of greater overcurrent in the converter valve module.

[0171] The above method is the power control of the converter valve module under the discharge condition, while in the power control method of the converter valve module under the charging condition, the relevant parameters include the number of remaining available sub-modules in the energy storage valve module and the maximum bus voltage that the energy storage valve can provide. Then, when the number of remaining available sub-modules exceeds the lower limit of the number of safe operating sub-modules and the maximum bus voltage exceeds the safe lower limit of the DC bus voltage, the power correction value is determined based on the maximum bus voltage; then, the power of the converter valve module is controlled according to the power correction value.

[0172] The maximum bus voltage here is the maximum bus voltage under charging conditions. The power correction value at this time can be the product of the maximum bus voltage and the current. The current here can be the bus current safe operation limit.

[0173] In the above implementation process, a suitable power correction value is obtained based on the maximum bus voltage to ensure reasonable power control of the converter valve module.

[0174] On the basis of the above embodiment, in order to ensure the safety of system operation, in the method of obtaining the power correction value, it is also possible to first determine whether the maximum bus voltage exceeds the rated value of the DC bus voltage. If not, the power correction value is obtained based on the maximum bus voltage and the DC bus current safe operation limit. If exceeded, the power correction value is obtained based on the rated value of the DC bus voltage and the DC bus current safe operation limit.

[0175] For example, when the maximum bus voltage exceeds the rated value of the DC bus voltage, the specific calculation formula for the power correction value is as follows:

[0176] U′ dc =U dc ;

[0177] P′ ref =η×U′ dc ×(I dcmax -ΔI);

[0178] Among them, U′ dc is the voltage correction value, U dc is the rated voltage of the DC bus, I dcmax is the safe operating limit of the DC bus current, η is the power conversion efficiency, and ΔI is the current margin.

[0179] When the maximum bus voltage does not exceed the rated value of the DC bus voltage, the specific calculation formula for the power correction value is as follows:

[0180] U′ dc =U dcmin ;

[0181] P′ ref =η×U′ dc ×(I dcmax -ΔI);

[0182] Among them, U′ dc is the voltage correction value, U dcmin is the DC bus voltage safety lower limit, I dcmax is the safe operating limit of the DC bus current, η is the power conversion efficiency, and ΔI is the current margin.

[0183] In the above implementation process, different power correction values ​​are determined under different circumstances to control the converter valve module to continue to operate at a suitable power, thereby ensuring that the converter valve module can continue to operate safely.

[0184] It should also be noted here that after determining the relationship between the maximum bus voltage and the rated value of the DC bus voltage, there is no need to determine the relationship between the current correction value and the safe operating limit of the DC bus current under charging conditions. This is because the current correction value here generally does not exceed the safe operating limit of the DC bus current, so there is no need to determine it again, saving resources. Of course, in actual applications, in order to unify the judgment process with that under discharge conditions, this step of judgment can also be added.

[0185] On the basis of the above embodiment, after obtaining the power correction value, the power control method of the converter valve module is performed according to the power correction value. This is similar to the principle of voltage control of the energy storage valve module based on the voltage correction value. In order to ensure the safety of the device, the power correction rate can also be obtained according to the power correction value and the initial power, and then the power control of the converter valve module is performed according to the power correction rate.

[0186] For example, the power correction rate is calculated as follows:

[0187]

[0188] Wherein, P represents the power correction value, P' represents the initial power, and k represents the power correction rate, and the unit may be pu.

[0189] When the power of the converter valve module is controlled according to the power correction rate, the initial power of the converter valve module can be slowly reduced to the power correction value according to the power correction rate.

[0190] In the above implementation process, the power of the converter valve module is controlled according to the power correction rate, so that the power of the converter valve module can be slowly controlled to reduce the problem of unstable operation of the device due to excessive power changes in the device in a short period of time caused by excessive adjustment amplitude.

[0191] On the basis of the above embodiments, in order to further ensure the stable operation of the system, when performing power control, the power correction range in which the power correction rate is located can be determined first, and then the power reduction control of the converter valve module can be performed according to the power correction rate corresponding to the power correction range.

[0192] The power control method here is similar to the principle of the voltage control method mentioned above. The corresponding relationship between the power correction range and the power correction rate can also be pre-set. For example, the power correction range is 0-kp1, and its corresponding power correction rate is kv1. The power correction range is kp1-kp2, and its corresponding power correction rate is kv2. The power correction range is above kp2, and its corresponding power correction rate is kv3, wherein kv1<kv2<kv3. After calculating and obtaining the power correction rate k in the above manner, the power correction range in which k is located can be determined first. For example, if the power correction range corresponding to k is within 0-kp1, then the power correction rate kv1 corresponding to the power correction range can be obtained to adjust the power of the converter valve module.

[0193] It should be noted that, in practical applications, the corresponding relationship between the power correction range and the power correction rate can be flexibly set, that is, the power correction rate corresponding to different power correction ranges can be set from the perspective of the stability of the power transmission system.

[0194] In the above implementation process, different power correction rate ranges are used to constrain the current power correction rate, so that a suitable power correction rate can be selected to perform power reduction control on the converter valve module to reduce the impact of excessive power adjustment on the device.

[0195] On the basis of the above embodiment, in order to ensure safety, after obtaining the power correction rate, the method may further include: if the power correction rate is less than a set threshold, outputting an alarm message.

[0196] It can be understood that if the power correction rate is too small, it means that the adjustment range of the power of the converter valve module is large, and a large adjustment of the power may affect the operation of the converter valve module. Therefore, an alarm message can be output to prompt the staff to participate in the verification and then determine whether the control strategy needs to be adjusted.

[0197] In the above implementation process, the power correction rate is too small, indicating that the power adjustment range is large. Thus, a large power reduction control on the converter valve module may affect its operation, so an alarm message is output to prompt the staff to perform manual intervention.

[0198] The information control method provided in the embodiment of the present application can, when the energy storage valve module has a submodule bypass, change the voltage of the energy storage valve module and the power of the converter valve module, so that the energy storage valve module can continue to operate in a reduced power state, thereby ensuring the safe operation of the device while fully utilizing the voltage and current tolerance capacity of the device and improving the energy utilization rate of the system.

[0199] The above process is described below with an example of a specific embodiment.

[0200] First, some security index parameters of the system are pre-set. In actual situations, the setting of parameter information can consider the following factors:

[0201] (1) From the perspective of system safety operation, the safety index is determined as the DC bus voltage safety lower limit U dcmin , DC bus current safe operation limit I dcmax , Lower limit of number of safe operation submodules N safe .

[0202] It should be noted that the safety indicators given here are only examples of the minimum scope required to implement this technical solution. If the engineering specifications have other requirements, the safety indicators need to be increased or modified accordingly, and the corresponding indicators in the subsequent voltage correction value or power correction value calculation part also need to be verified accordingly.

[0203] (2) Based on the engineering bidding specifications, relevant industry technical specifications, the voltage and current tolerance of each sub-module component, the component operating life and other requirements, safety index parameters are set while leaving a certain safety margin.

[0204] It should be noted that the basis for setting safety index parameters includes but is not limited to the above contents; the safety margin needs to be considered comprehensively from both economic benefits and safety performance aspects, which varies between different projects and needs to be determined based on actual conditions and engineering experience.

[0205] (3) From the perspective of stable operation of the system, the correction thresholds kp1 and kp2 corresponding to the correction range and the corresponding correction rates kv1 and kv2 are determined. The correction threshold is an indicator for evaluating the correction amplitude, and correction ranges of different gradients correspond to different correction rates.

[0206] (4) Analyze the system small signal stability model or the historical data of power station dispatch, and adjust the control parameters such as voltage and power based on engineering experience.

[0207] It should be noted that the adjustment methods for the control parameters include but are not limited to the above two. The considerations given here are only an example for illustrating the implementation of this technical solution, and it is necessary to select the best one according to the actual engineering situation.

[0208] (5) Establish a battery parameter fitting model based on the battery test history data. The battery tests include but are not limited to battery capacity test, hybrid power pulse capability test, low rate charge and discharge test, high and low temperature charge and discharge test, etc. According to the test data, establish the parameter fitting model of battery state of charge SOC, battery terminal voltage OCV, and battery internal resistance R. Taking the commonly used lithium iron phosphate battery on the market as an example, when the SOC remains unchanged, the OCV and R of the lithium iron phosphate battery hardly change. After obtaining the fitting function, the corresponding SOC and R can be obtained according to the set parameter fitting model based on the sampled OCV value.

[0209] Optionally, the selection of the above parameter fitting model is based on the steady-state zero-order model of the battery. If there are higher requirements for the accuracy of the battery model, a precise model such as the battery second-order model can be selected. At this time, the selection of the corresponding battery parameter fitting model should be changed accordingly.

[0210] It should be noted that the establishment of an actual battery parameter fitting model requires far more parameters than SOC, OCV, and R according to fitting methods of different precisions. The parameters given here are only examples of the minimum range required to implement this technical solution.

[0211] Based on the above considerations, the safety index parameters are set as shown in the following table:

[0212]

[0213] Let's understand the following implementation process in conjunction with the entire flow chart. Fig. 9 As shown, the discharge condition is taken as an example (it can be understood that the process of the charging condition only lacks the step of determining whether the current correction value exceeds the safe operation limit of the DC bus current, and the remaining steps are similar).

[0214] During system operation, if the valve controller detects that 4 submodules of the energy storage valve module are bypassed due to a fault, the number of remaining available submodules Non =34, all redundant modules are exhausted. In the power transmission system, the control modes of the energy storage valve module and the converter valve module are respectively energy storage valve module fixed DC voltage control and converter valve module fixed active power control.

[0215] The valve controller determines the remaining available submodule number N of the energy storage valve module on =34, exceeding the lower limit of the number of safe operation submodules, that is, N on >N safe , enter the power reduction control mode without stopping for maintenance.

[0216] Calculate the maximum bus voltage that the energy storage valve module can provide at this time:

[0217] U′ dcmax =N on ×OCV=74.8kV;

[0218] Will U′ dcmax with U dcmin By comparison, the maximum bus voltage that the energy storage valve can provide at this time exceeds the DC bus voltage safety lower limit of 69kV, and enters the next stage.

[0219] Will U′ dcmax with U dc By comparison, the maximum bus voltage that the energy storage valve can provide at this time exceeds the DC bus voltage rating of 70kV, and enters the next stage.

[0220] Calculate the current correction value and voltage correction value:

[0221]

[0222] U′ dc =U dc =70kV;

[0223] I′ dc If the current is less than the safe operating limit of the DC bus current of 2.2kA, the system will proceed to the next stage.

[0224] Calculate the power correction:

[0225] P′ ref =η×U′ dc ×I′ dc =93.83MW;

[0226] Calculate the voltage correction rate and the power correction rate:

[0227] Voltage correction rate: At this time, the range of voltage correction rate is greater than kp1, and its corresponding correction rate is kv1;

[0228] Power correction rate: kp1>k2>kp2, and the corresponding correction rate is kv2.

[0229] Therefore, the voltage control of the energy storage valve module is corrected according to the voltage correction rate, kv1, and the power control of the converter valve module is corrected according to the power correction rate, kv2. According to the barrel effect, the correction rate takes the minimum value.

[0230] Then, the initial power of the active power control of the converter valve module is modified to 93.83MW at a rate of kv2=0.01pu, and the voltage reference value kv1=0.02pu of the DC voltage control of the energy storage valve module is modified to 70kV (i.e., no change occurs), thereby completing the power reduction control.

[0231] The embodiment of the present application further provides an information control method, in which the information control method in the above embodiment is executed for each phase energy storage valve module in the power transmission system.

[0232] It should be noted that the information control method in this embodiment is different from the information control method in the above embodiment in that the information control method in the above embodiment is controlled for a single-phase energy storage valve module, while the information control method in this embodiment is controlled for a multi-phase energy storage valve module. In this embodiment, when it is determined that the first-phase energy storage valve module needs to stop running, the remaining phase energy storage valve modules except the first-phase energy storage valve module in the power transmission system are also controlled to stop running. The first-phase energy storage valve module is any phase energy storage valve module of the power transmission system.

[0233] For example, taking a power transmission system including a three-phase energy storage valve module as an example, when it is determined that some submodules in the energy storage valve module are bypassed due to a fault or other reasons, the number of remaining available submodules N of each phase energy storage valve module is obtained. aon 、N bon 、N con .

[0234] Then the battery state of charge SOC and battery internal resistance R are obtained according to the battery terminal voltage OCV.

[0235] Determine the number of available submodules N remaining in each phase aon 、N bon 、N con Whether the number of safe operation submodules exceeds the lower limit N safe ;

[0236] If one phase does not exceed the limit, all phase energy storage valve modules are controlled to stop running and perform maintenance;

[0237] If both are exceeded, the maximum bus voltage that can be provided by the energy storage valve module of each phase is calculated;

[0238] The number of available submodules remaining in each phase is N. aon 、N bon 、N con Under the discharge condition, the maximum bus voltage that each phase energy storage valve module can provide is:

[0239] U′ amax =N aon ×OCV;

[0240] U′ bmax =N bon ×OCV;

[0241] U′ cmax =N con ×OCV;

[0242] Determine U′ amax , U′ bmax , U′ cmax Whether the DC bus voltage exceeds the safety lower limit U dcmin ;

[0243] If one phase does not exceed the limit, then in addition to controlling the energy storage valve module of the phase that has not exceeded the limit to stop running, the energy storage valve modules of other phases are also controlled to stop running for maintenance;

[0244] If both exceed, then further judge U′ amax , U′ bmax , U′ cmax Whether the bus voltage exceeds the rated value U dc ;

[0245] If it exceeds, the current correction value and voltage correction value are calculated according to the following formula:

[0246] U′ adc =U dc =N aon ×(OCV-I′ adc ×R);

[0247] U′ bdc =U dc =N bon ×(OCV-I′ bdc ×R);

[0248] U′ cdc =U dc =N con ×(OCV-I′ cdc ×R);

[0249]

[0250]

[0251]

[0252] If it does not exceed, the current correction value and voltage correction value are calculated according to the following formula, and the modulation ratio correction value is calculated to meet the AC side voltage requirement.

[0253] U′ adc =U dcmin =N on ×(OCV-I′ adc ×R);

[0254] U′ bdc =U dcmin =N on ×(OCV-I′ bdc ×R);

[0255] U′ cdc =U dcmin =N on ×(OCV-I′ cdc ×R);

[0256]

[0257]

[0258]

[0259]

[0260] Where m' represents the modulation ratio correction value, U dc is the rated value of DC bus voltage, U′ ac is the effective value of the AC side voltage.

[0261] Then determine whether the calculated m′ meets the engineering requirements. If not, the system is shut down for maintenance. If it does, proceed to the next step.

[0262] Judgment I′ adc , I′ bdc , I′ cdc Whether the DC bus current exceeds the safe operation limit I dcmax ;

[0263] If it exceeds, all phase energy storage valve modules will be controlled to stop running and be repaired;

[0264] If not exceeded, calculate the power correction value:

[0265] P′ ref =η×(U′ adc ×I′ adc +U′ bdc ×I′bdc +U′ cdc ×I′ cdc ).

[0266] Then, after the voltage correction value and the power correction value are obtained as described above, the voltage of each energy storage valve module can be controlled according to the voltage correction value of each phase energy storage valve module, and the power of the converter valve module can be controlled according to the power correction value.

[0267] Therefore, in the embodiment of the present application, the correction value can be considered from the perspective of the electrical relationship between the energy storage valve module and the converter valve module and the coordinated control perspective, thereby providing a reliable power reduction control operation scheme, making full use of the tolerance of the device, and improving the energy utilization rate of the energy storage valve module. And according to different correction gradients (i.e., correction ranges), different correction rates are used for control, which is conducive to the stable operation of the system.

[0268] Please refer to Fig.10 , Fig.10 This is a structural block diagram of an information control device 200 provided in an embodiment of the present application. The device 200 may be a module, program segment or code on an electronic device. It should be understood that the device 200 is similar to the above Figure 4 The method embodiment corresponds to and can be executed Figure 4 The various steps involved in the method embodiment and the specific functions of the device 200 can be found in the above description. To avoid repetition, the detailed description is appropriately omitted here.

[0269] Optionally, the device 200 includes:

[0270] A parameter acquisition module 210, for acquiring relevant parameters of the energy storage valve module when it is determined that a submodule bypass exists in the energy storage valve module;

[0271] The control module 220 is used to control the operating state of the energy storage valve module according to the relevant parameters.

[0272] Optionally, the relevant parameters include the number of remaining available sub-modules in the energy storage valve module; the control module 220 is used to control the energy storage valve module to stop operating when the number of remaining available sub-modules does not exceed the lower limit of the number of safe operation sub-modules.

[0273] Optionally, the relevant parameters include the number of remaining available sub-modules in the energy storage valve module and the maximum bus voltage that the energy storage valve module can provide; the control module 220 is used to control the energy storage valve module to stop operating when the number of remaining available sub-modules exceeds the lower limit of the number of safe operation sub-modules and the maximum bus voltage does not exceed the safety lower limit of the DC bus voltage.

[0274] Optionally, under the discharge condition, the relevant parameters include the number of remaining available sub-modules in the energy storage valve module and the maximum bus voltage that the energy storage valve can provide; the control module 220 is used to obtain a current correction value when the number of remaining available sub-modules exceeds the lower limit of the number of safe operation sub-modules and the maximum bus voltage exceeds the safe lower limit of the DC bus voltage; and control the energy storage valve module to stop operating when the current correction value exceeds the safe operation limit of the DC bus current.

[0275] Optionally, the control module 220 is used to determine whether the maximum bus voltage exceeds the DC bus voltage rated value; if exceeded, a current correction value is calculated based on the DC bus voltage rated value and the remaining number of available sub-modules; if not exceeded, a current correction value is calculated based on the DC bus voltage safety lower limit and the remaining number of available sub-modules.

[0276] Optionally, when the number of remaining available sub-modules exceeds the lower limit of the number of safe operation sub-modules and the maximum bus voltage exceeds the safe lower limit of the DC bus voltage, the control module 220 is further used to obtain a voltage correction value; when the current correction value does not exceed the safe operation limit of the DC bus, the energy storage valve module is voltage controlled according to the voltage correction value.

[0277] Optionally, the control module 220 is used to determine the DC bus voltage rated value as the voltage correction value when the maximum bus voltage exceeds the DC bus voltage rated value; and to determine the DC bus voltage safety lower limit as the voltage correction value when the maximum bus voltage does not exceed the DC bus voltage rated value.

[0278] Optionally, the control module 220 is used to obtain a voltage correction rate according to the voltage correction value and the initial voltage; and perform voltage control on the energy storage valve module according to the voltage correction rate.

[0279] Optionally, the control module 220 is used to determine a voltage correction rate range in which the voltage correction rate is located; and perform voltage reduction control on the energy storage valve module according to the voltage correction rate corresponding to the voltage correction rate range.

[0280] Optionally, the control module 220 is further configured to output an alarm message if the voltage correction rate is less than a set threshold.

[0281] Optionally, when the current correction value does not exceed the safe operation limit of the DC bus, the control module 220 is further used to obtain a power correction value based on the current correction value and the voltage correction value; and perform power control on the converter valve module based on the power correction value.

[0282] Optionally, under charging conditions, the relevant parameters include the number of remaining available sub-modules in the energy storage valve module and the maximum bus voltage that the energy storage valve can provide; the control module 220 is also used to determine a power correction value based on the maximum bus voltage when the number of remaining available sub-modules exceeds the lower limit of the number of safe operating sub-modules and the maximum bus voltage exceeds the safety lower limit of the DC bus voltage; and perform power control on the converter valve module according to the power correction value.

[0283] Optionally, the control module 220 is used to determine whether the maximum bus voltage exceeds the rated value of the DC bus voltage; if not, obtaining a power correction value based on the DC bus voltage safety lower limit and the DC bus current safety operation limit; if exceeded, obtaining a power correction value based on the DC bus voltage rated value and the DC bus current safety operation limit.

[0284] Optionally, the control module 220 is used to obtain a power correction rate according to the power correction value and the initial power; and perform power control on the converter valve module according to the power correction rate.

[0285] Optionally, the control module 220 is used to determine a power correction range in which the power correction rate is located; and perform power reduction control on the converter valve module according to the power correction rate corresponding to the power correction range.

[0286] Optionally, the control module 220 is further configured to output an alarm message if the power correction rate is less than a set threshold.

[0287] The present application also provides an information control device, which includes:

[0288] An information control module, for executing the above embodiment to provide an information control method for one phase of the energy storage valve module for each phase of the power transmission system;

[0289] When it is determined that the first-phase energy storage valve module needs to stop running, the remaining phase energy storage valve modules in the power transmission system except the first-phase energy storage valve module are controlled to stop running, and the first-phase energy storage valve module is any phase energy storage valve module of the power transmission system.

[0290] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0291] Please refer to Fig.11 , Fig.11A structural diagram of an electronic device for executing an information control method provided in an embodiment of the present application, the electronic device may include: at least one processor 310, such as a CPU, at least one communication interface 320, at least one memory 330 and at least one communication bus 340. Among them, the communication bus 340 is used to realize direct connection and communication between these components. Among them, the communication interface 320 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 330 can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk storage. The memory 330 can optionally also be at least one storage device located away from the aforementioned processor. The memory 330 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 310, the electronic device executes the above-mentioned Figure 4 The method process is shown.

[0292] Understandably, Fig.11 The structure shown is for illustration only, and the electronic device may also include Fig.11 More or fewer components as shown, or with Fig.11 Different configurations are shown. Fig.11 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0293] The present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the following is performed: Figure 4 The method process in the method embodiment shown is executed by the electronic device.

[0294] This embodiment discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can perform the methods provided by the above method embodiments, for example, including:

[0295] When it is determined that there is a submodule bypass in the energy storage valve module, obtaining relevant parameters of the energy storage valve module;

[0296] The operating state of the energy storage valve module is controlled according to the relevant parameters.

[0297] In summary, the embodiments of the present application provide an information control method, device, electronic device and storage medium. The method obtains relevant parameters of the energy storage valve module when it is determined that a submodule bypass exists in the energy storage valve module, and then controls the operating state of the energy storage valve module according to the relevant parameters. In this way, there is no need to shut down the energy storage valve module for maintenance when the submodule bypasses. Instead, the operating state of the energy storage valve module is controlled according to the relevant parameters, which can effectively improve the utilization rate of the energy storage valve module and save resources.

[0298] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0299] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0300] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0301] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0302] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An information control method, characterized in that: The method comprises: When it is determined that there is a submodule bypass in the energy storage valve module, obtaining relevant parameters of the energy storage valve module; The operating state of the energy storage valve module is controlled according to the relevant parameters.

2. The method according to claim 1, characterized in that The relevant parameters include the number of remaining available submodules in the energy storage valve module; and controlling the operating state of the energy storage valve module according to the relevant parameters includes: When the number of remaining available submodules does not exceed the lower limit of the number of safe operation submodules, the energy storage valve module is controlled to stop operating.

3. The method according to claim 1, characterized in that The relevant parameters include the number of remaining available submodules in the energy storage valve module and the maximum bus voltage that the energy storage valve module can provide; and controlling the operating state of the energy storage valve module according to the relevant parameters includes: When the number of remaining available submodules exceeds the lower limit of the number of safe-operating submodules and the maximum bus voltage does not exceed the safe lower limit of the DC bus voltage, the energy storage valve module is controlled to stop operating.

4. The method according to claim 1, characterized in that: Under the discharge condition, the relevant parameters include the number of remaining available submodules in the energy storage valve module and the maximum bus voltage that the energy storage valve can provide; and controlling the operating state of the energy storage valve module according to the relevant parameters includes: When the number of remaining available submodules exceeds the lower limit of the number of safe operation submodules and the maximum bus voltage exceeds the safety lower limit of the DC bus voltage, obtaining a current correction value; When the current correction value exceeds the safe operation limit of the DC bus current, the energy storage valve module is controlled to stop operating.

5. The method according to claim 4, characterized in that The obtaining of the current correction value comprises: Determining whether the maximum bus voltage exceeds the rated value of the DC bus voltage; If it exceeds, a current correction value is calculated based on the DC bus voltage rated value and the remaining available submodule quantity; If it does not exceed, the current correction value is calculated based on the DC bus voltage safety lower limit and the remaining available sub-module quantity.

6. The method according to claim 5, characterized in that When the number of remaining available submodules exceeds the lower limit of the number of safe operation submodules and the maximum bus voltage exceeds the DC bus voltage safety lower limit, the method further includes: Get voltage correction value; When the current correction value does not exceed the safe operation limit of the DC bus, the voltage of the energy storage valve module is controlled according to the voltage correction value.

7. The method according to claim 6, characterized in that The obtaining of the voltage correction value comprises: In a case where the maximum bus voltage exceeds the rated value of the DC bus voltage, determining the rated value of the DC bus voltage as the voltage correction value; When the maximum bus voltage does not exceed the rated value of the DC bus voltage, the DC bus voltage safety lower limit is determined as the voltage correction value.

8. The method according to claim 6, characterized in that The step of controlling the voltage of the energy storage valve module according to the voltage correction value includes: Acquire a voltage correction rate according to the voltage correction value and the initial voltage; The voltage of the energy storage valve module is controlled according to the voltage correction rate.

9. The method according to claim 8, characterized in that The voltage control of the energy storage valve module according to the voltage correction rate includes: Determine a voltage correction rate range within which the voltage correction rate falls; The energy storage valve module is controlled to reduce voltage according to the voltage correction rate corresponding to the voltage correction rate range.

10. The method according to claim 8, characterized in that After obtaining the voltage correction rate according to the voltage correction value and the initial voltage, the method further includes: If the voltage correction rate is less than the set threshold, an alarm message is output.

11. The method according to claim 6, characterized in that In the case where the current correction value does not exceed the safe operation limit of the DC bus, the method further includes: Obtaining a power correction value according to the current correction value and the voltage correction value; The power of the converter valve module is controlled according to the power correction value.

12. The method according to claim 1, characterized in that Under the charging condition, the relevant parameters include the number of remaining available submodules in the energy storage valve module and the maximum bus voltage that can be provided by the energy storage valve; the method also includes: When the number of remaining available submodules exceeds the lower limit of the number of safe operating submodules and the maximum bus voltage exceeds the safety lower limit of the DC bus voltage, a power correction value is determined based on the maximum bus voltage; The power of the converter valve module is controlled according to the power correction value.

13. The method according to claim 12, characterized in that The determining of the power correction value based on the maximum bus voltage comprises: Determining whether the maximum bus voltage exceeds the rated value of the DC bus voltage; If not, obtaining a power correction value based on the DC bus voltage safety lower limit and the DC bus current safety operation limit; If it exceeds, a power correction value is obtained based on the DC bus voltage rated value and the DC bus current safe operation limit value.

14. The method according to any one of claims 11 to 13, characterized in that: The power control of the converter valve module according to the power correction value includes: Acquire a power correction rate according to the power correction value and the initial power; The power of the converter valve module is controlled according to the power correction rate.

15. The method according to claim 14, characterized in that The power control of the converter valve module according to the power correction rate includes: Determining a power correction range within which the power correction rate lies; The power reduction control of the converter valve module is performed according to the power correction rate corresponding to the power correction range.

16. The method according to claim 14, characterized in that After obtaining the power correction rate according to the power correction value and the initial power, the method further includes: If the power correction rate is less than a set threshold, an alarm message is output.

17. An information control method, characterized in that: The method comprises: For each phase energy storage valve module in the power transmission system, executing the information control method according to any one of claims 1 to 16; When it is determined that the first-phase energy storage valve module needs to stop running, the remaining phase energy storage valve modules in the power transmission system except the first-phase energy storage valve module are controlled to stop running, and the first-phase energy storage valve module is any phase energy storage valve module of the power transmission system.

18. An information control device, characterized in that: The device comprises: A parameter acquisition module, used to acquire relevant parameters of the energy storage valve module when it is determined that a submodule bypass exists in the energy storage valve module; The control module is used to control the operating state of the energy storage valve module according to the relevant parameters.

19. An information control device, characterized in that: The device comprises: An information control module, configured to execute the information control method according to any one of claims 1 to 16 for each phase energy storage valve module in the power transmission system; When it is determined that the first-phase energy storage valve module needs to stop running, the remaining phase energy storage valve modules in the power transmission system except the first-phase energy storage valve module are controlled to stop running, and the first-phase energy storage valve module is any phase energy storage valve module of the power transmission system.

20. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 17 is executed.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 17 is performed.

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