Control method and apparatus for new energy storage system, device, system, and medium

Abstract

The present application relates to a control method and apparatus for a new energy storage system, a device, a system, and a medium. The method comprises: acquiring comprehensive capability parameters of each sub-module among at least two sub-modules cascaded in a new energy storage system, the comprehensive capability parameters of each sub-module being determined on the basis of power demand parameters of a power grid system, output power parameters of a new energy power generation module comprised in each sub-module, and maximum charging parameters of a battery module comprised in each sub-module, wherein each sub-module is used for performing electric energy exchange with the power grid system; and controlling a switching state of each sub-module in the new energy storage system on the basis of at least two comprehensive capability parameters. Using this method can improve the accuracy of electric energy dispatching in new energy storage systems.

Description

Control methods, devices, equipment, systems and media for new energy storage systems Cross-references

[0001] This application incorporates Chinese Patent Application No. 202411796257.2, filed on December 6, 2024, entitled “Control method, device, equipment, system and medium for new energy storage system”, which is incorporated herein by reference in its entirety. Technical Field

[0002] This application relates to the field of new energy technology, and in particular to a control method, device, equipment, system and medium for a new energy storage system. Background Technology

[0003] Energy storage plays a crucial role in balancing power supply and demand and enhancing grid stability within power systems, while also promoting the efficient utilization of renewable energy. With the continuous development of energy storage technology, new energy storage systems have become a research hotspot and possess broad application prospects due to their advantages such as being green and pollution-free, low-carbon and environmentally friendly, and clean and renewable. New energy storage systems can store electrical energy and supply it to the power grid.

[0004] In some cases, the power dispatch of new energy storage systems is often based on experience, resulting in low accuracy in power dispatch. Summary of the Invention

[0005] Based on this, this application provides a control method, device, equipment, system, and medium for a new energy storage system, which can improve the accuracy of power dispatching in the new energy storage system.

[0006] In a first aspect, this application provides a control method for a new energy storage system. The method includes: obtaining the comprehensive capability parameters of each submodule in at least two cascaded submodules of the new energy storage system; the comprehensive capability parameters of each submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation module included in each submodule, and the maximum charging parameters of the battery module included in each submodule; wherein each submodule is used to exchange electrical energy with the power grid system; and controlling the switching state of the submodules in the new energy storage system based on at least two comprehensive capability parameters.

[0007] In the technical solution of this application embodiment, the switching status of sub-modules in the new energy storage system can be controlled according to the power demand parameters of the power grid system, the output power parameters of the new energy power generation modules included in each sub-module, and the maximum charging parameters of the battery modules included in each sub-module. That is, the switching control strategy of the sub-module is determined according to the demand of the power grid system and the current real state of the sub-module. Thus, the power dispatch of the new energy storage system meets the needs of the real scenario, and abandons the problem of low accuracy of power dispatch of the new energy storage system caused by relying on experience in the past. In this way, the embodiment of this application can improve the accuracy of power dispatch of the new energy storage system.

[0008] In some embodiments, controlling the switching status of submodules in a new energy storage system based on at least two comprehensive capability parameters includes: sorting the at least two comprehensive capability parameters; and controlling the switching status of submodules in the new energy storage system based on the sorted comprehensive capability parameters. In the technical solution of this application embodiment, different comprehensive capability parameters represent different availability states of submodules. Controlling the switching status of submodules based on their availability states helps to prioritize the selection of submodules with better availability, thereby improving the effectiveness of power dispatching in the new energy storage system.

[0009] In some embodiments, controlling the switching status of submodules in a new energy storage system based on sorted comprehensive capability parameters includes: determining the required number of submodules based on the power demand parameters of the power grid system; determining the available number of submodules based on the comprehensive capability parameters of each submodule; and controlling the switching status of submodules in the new energy storage system based on the available number, the required number, and the sorted comprehensive capability parameters. In the technical solution of this application embodiment, the required number of submodules is dynamically adjusted based on the power demand parameters of the power grid system, and the available number of submodules is dynamically adjusted based on the comprehensive capability parameters of each submodule. This allows for dynamic control of the switching status of submodules in the new energy storage system based on the available number and the required number, thereby improving the flexibility of submodule switching operation. Furthermore, the control of the switching status of submodules can match the power demand parameters of the power grid system and the comprehensive capability parameters of the submodules, improving the accuracy of power dispatching in the new energy storage system.

[0010] In some embodiments, the switching status of submodules in a new energy storage system is controlled based on the available quantity, the demand quantity, and the sorted comprehensive capability parameters. This includes: when the available quantity is less than the demand quantity, controlling all submodules in the new energy storage system to be in a locked state; when the available quantity equals the demand quantity, controlling the available submodules in the new energy storage system to be in an activated state; and when the available quantity is greater than the demand quantity, controlling the switching status of submodules in the new energy storage system based on the sorted comprehensive capability parameters. In the technical solution of this application embodiment, the switching of submodules is controlled in different ways according to the different magnitudes of the available quantity and the demand quantity. This allows the submodule switching scheme to take into account the magnitudes of the available quantity and the demand quantity, improving the accuracy of power dispatching in the new energy storage system.

[0011] In some embodiments, controlling the switching state of submodules in a new energy storage system based on sorted comprehensive capability parameters includes: determining a first difference between the largest and smallest comprehensive capability parameters; and controlling the switching state of submodules in the new energy storage system based on the first difference and the sorted comprehensive capability parameters. In the technical solution of this application embodiment, the first difference represents the degree of balance of the submodules in the new energy storage system. A larger first difference indicates a lower degree of balance for the submodules, while a smaller first difference indicates a higher degree of balance. Thus, controlling the switching state of submodules based on their degree of balance helps improve the balance of the submodules and enhances the operational stability of the submodules in the new energy storage system.

[0012] In some embodiments, the switching status of submodules in the new energy storage system is controlled based on a first difference, a target threshold, and sorted comprehensive capability parameters. This includes: when the first difference is greater than or equal to the target threshold, controlling the submodules corresponding to the first N comprehensive capability parameters to be in the "on" state and controlling the submodules corresponding to the remaining comprehensive capability parameters to be in the "off" state, based on the comprehensive capability parameters sorted from largest to smallest; where N is the required number of submodules; and when the first difference is less than the target threshold, controlling the switching status of M submodules based on the sorted comprehensive capability parameters, where M is the difference between the required number of submodules and the number already in the "on" state. In the technical solution of this application embodiment, when the first difference is greater than or equal to the target threshold, it indicates that the balance of the sub-modules is poor. Investing the N sub-modules with the highest comprehensive capability parameters not only helps reduce the difference between the comprehensive capability parameters of these N sub-modules and the remaining sub-modules, but also improves the availability of the sub-modules as their comprehensive capability parameters increase, thereby enhancing the effectiveness of power dispatching in the new energy storage system. When the first difference is less than the target threshold, it indicates that the balance of the sub-modules is good. Controlling the switching status of M sub-modules based on the sorted comprehensive capability parameters not only helps reduce the difference between the comprehensive capability parameters of these M sub-modules and the remaining sub-modules, but also eliminates the need to change the investment status of the already invested sub-modules, reducing fluctuations in the power parameters of the new energy storage system caused by switching statuses, and improving the operational stability of the new energy storage system.

[0013] In some embodiments, controlling the activation / deactivation status of M sub-modules based on the sorted comprehensive capability parameters includes: when M is greater than a target value, controlling the sub-modules corresponding to the top M comprehensive capability parameters to be in an activated state based on the comprehensive capability parameters of the unactivated sub-modules sorted from largest to smallest; when M is less than or equal to the target value, controlling the sub-modules corresponding to the top M comprehensive capability parameters to be in a deactivated state based on the comprehensive capability parameters of the activated sub-modules sorted from smallest to largest. In the technical solution of this application embodiment, the activation / deactivation status of the M sub-modules is controlled based on whether the difference between the required quantity and the already activated quantity (i.e., M) of the sub-modules is greater than a target value. Therefore, the activation / deactivation status of the sub-modules can be determined based on the required quantity and the already activated quantity of the sub-modules, improving the effectiveness of power dispatching in the new energy storage system. Furthermore, controlling the sub-modules corresponding to the top M highest comprehensive capability parameters to be in an activated state and controlling the sub-modules corresponding to the top M lowest comprehensive capability parameters to be in a deactivated state prioritizes the activation of sub-modules with high comprehensive capability parameters, further improving the effectiveness of power dispatching in the new energy storage system.

[0014] In some embodiments, the method further includes: acquiring battery capability parameters of the battery modules in the setting submodule, which includes at least one submodule; setting the state of each submodule in the submodule to a cut-out state or a locked state; controlling the new energy power generation module in the first submodule to operate under power consumption restrictions; the first submodule is a submodule whose battery capability parameters are less than or equal to a target value; controlling the new energy power generation module in the second submodule to charge the battery module in the second submodule; the second submodule is a submodule whose battery capability parameters are greater than the target value. In the technical solution of this application embodiment, a target value for the battery capability parameter indicates that power cannot be supplied to the battery module. By controlling the new energy power generation module in the submodule whose battery capability parameters are less than or equal to the target value to operate under power consumption restrictions, the occurrence of battery module overcharging is reduced, which is beneficial to improving the reliability of the battery module. A battery capability parameter greater than the target value indicates that power can be supplied to the battery module. By controlling the new energy power generation module in the submodule whose battery capability parameters are greater than the target value to charge the battery module in the second submodule, the electrical energy generated by the new energy power generation module can be effectively utilized. Therefore, in this application embodiment, while ensuring the reliability of the battery module, the electrical energy generated by the new energy power generation module is stored in the battery module as much as possible, thereby improving the energy utilization efficiency.

[0015] Secondly, this application provides a control method for a new energy storage system. The method includes: determining the comprehensive capability parameters of a target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule; and sending the comprehensive capability parameters of the target submodule to a valve control device; wherein the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching state of the submodule in the new energy storage system. In the technical solution of this application embodiment, the target control device sends the comprehensive capability parameters of the target submodule to the valve control device, so that the valve control device controls the switching state of the submodule in the new energy storage system. Compared with the scheme where the valve control device not only determines the comprehensive capability parameters of the submodule, but also controls the switching state of the submodule in the new energy storage system based on the comprehensive capability parameters of the submodule, this not only reduces the computational burden on the valve control device, but also allows for the addition or deletion of the corresponding control device when adding or deleting submodules without requiring large-scale modifications to the valve control device, thus enhancing the scalability of the new energy storage system. Furthermore, the determination of the comprehensive capability parameters of the submodule can comprehensively consider the power demand parameters of the power grid system, the output power parameters of the new energy power generation module, and the maximum charging parameters of the battery module, thereby improving the accuracy of the determined comprehensive capability parameters of the submodule.

[0016] In some embodiments, the power demand parameters include the demand current, the output power parameters include the output current, and the maximum charging parameters include the maximum charging current. Based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule, the comprehensive capability parameters of the target submodule are determined, including: when the demand current of the power grid system represents the power absorption demand of the power grid system, determining a second difference between the output current of the new energy power generation module and the maximum charging current of the battery module; when the demand current of the power grid system is less than the second difference, determining the comprehensive capability parameter of the target submodule as a target value; and when the demand current of the power grid system is greater than or equal to the second difference, determining the comprehensive capability parameter of the target submodule based on the demand current of the power grid system and the output current of the new energy power generation module. In the technical solution of this application embodiment, if the required current of the power grid system is less than the second difference, it indicates that the minimum current output by the target submodule to the power grid system is greater than the required current of the power grid system, and the output current of the target submodule cannot be matched with the required current of the power grid system. If the required current of the power grid system is greater than or equal to the second difference, it indicates that the minimum current output by the target submodule to the power grid system is less than the required current of the power grid system, and the output current of the target submodule can be matched with the required current of the power grid system. Therefore, based on whether the output current of the target submodule can be matched with the required current of the power grid system, the comprehensive capability parameters of the target submodule are determined, thereby improving the accuracy of the determined comprehensive capability parameters of the target submodule.

[0017] In some embodiments, determining the comprehensive capability parameters of a target submodule based on the demand current of the power grid system and the output current of the new energy power generation module includes: when the demand current of the power grid system is less than the output current of the new energy power generation module, determining the output capability parameters of the new energy power generation module to the power grid system based on a second difference and the obtained theoretical maximum output current of the new energy power generation module; and determining the comprehensive capability parameters of the target submodule based on the output capability parameters. In the technical solution of this application embodiment, when the demand current of the power grid system is less than the output current of the new energy power generation module, the comprehensive capability parameters of the target submodule can comprehensively consider the second difference between the output current of the new energy power generation module and the maximum charging current of the battery module, as well as the theoretical maximum output current of the new energy power generation module. Therefore, the determined comprehensive capability parameters of the target submodule conform to the situation where the demand current of the power grid system is less than the output current of the new energy power generation module, improving the accuracy of the determined comprehensive capability parameters of the target submodule.

[0018] In some embodiments, determining the comprehensive capability parameters of a target submodule based on the grid system's demand current and the output current of the renewable energy generation module includes: when the grid system's demand current is greater than or equal to the renewable energy generation module's output current, determining the sum of the renewable energy generation module's output current and the obtained maximum discharge current of the battery module as the target submodule's total maximum output current; when the grid system's demand current is greater than the target submodule's total maximum output current, determining the target submodule's comprehensive capability parameter as zero; when the grid system's demand current is less than or equal to the target submodule's total maximum output current, determining the output capability parameter based on the renewable energy generation module's output current and its theoretical maximum output current, and then determining the target submodule's comprehensive capability parameters based on the output capability parameter. In the technical solution of this application embodiment, when the grid system's demand current is greater than or equal to the renewable energy generation module's output current, the target submodule's comprehensive capability parameters can comprehensively consider the relationship between the grid system's demand current and the target submodule's total maximum output current. Based on this relationship, different methods are used to determine the target submodule's comprehensive capability parameters, thereby ensuring that the determined target submodule's comprehensive capability parameters conform to the situation where the grid system's demand current is greater than or equal to the renewable energy generation module's output current, thus improving the accuracy of the determined target submodule's comprehensive capability parameters.

[0019] In some embodiments, the power demand parameters include the demand current, the output power parameters include the output current, and the maximum charging parameters include the maximum charging current. Based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule, the comprehensive capability parameters of the target submodule are determined, including: when the demand current of the power grid system represents the power demand of the power grid system, determining a third difference between the maximum charging current of the battery module and the output current of the new energy power generation module; when the demand current of the power grid system is greater than the third difference, determining the comprehensive capability parameter of the target submodule as a target value; and when the demand current of the power grid system is less than or equal to the third difference, determining the battery capability parameter of the battery module in the target submodule as the comprehensive capability parameter of the target submodule. In the technical solution of this application embodiment, if the required current of the power grid system is greater than the third difference, it indicates that the required current provided by the power grid system is greater than the charging current of the battery module, and the current provided by the power grid system cannot be matched with the current required by the battery module. If the required current of the power grid system is less than or equal to the third difference, it indicates that the required current provided by the power grid system is less than or equal to the charging current of the battery module, and the current provided by the power grid system can be matched with the current required by the battery module. Therefore, based on whether the current provided by the power grid system and the current required by the battery module can be matched, the comprehensive capability parameters of the target submodule are determined, thereby improving the accuracy of the determined comprehensive capability parameters of the target submodule.

[0020] In some embodiments, the method further includes: acquiring the battery state of charge (SOC) and battery power capability parameters of the battery module in the target submodule; fusing the SOC and battery power capability parameters to obtain the battery capability parameters of the battery module in the target submodule; and sending the battery capability parameters of the battery module in the target submodule to a valve control device; wherein the battery capability parameters of the battery module in the target submodule are used by the valve control device to control the power supply state of the new energy power generation module in the target submodule to the battery module in the target submodule. In the technical solution of this application embodiment, the battery capability parameters of the battery module can comprehensively consider the battery SOC and battery power capability parameters of the battery module, thereby improving the accuracy of the determined battery capability parameters of the battery module. Furthermore, the target control device sends the battery capability parameters of the battery module in the target submodule to the valve control device so that the valve control device controls the power supply state of the new energy power generation module in the target submodule to the battery module in the target submodule, thereby improving energy utilization efficiency.

[0021] Thirdly, this application provides an electronic device comprising: an acquisition module for acquiring the comprehensive capability parameters of each of at least two cascaded sub-modules in a new energy storage system; the comprehensive capability parameters of each sub-module are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation module included in each sub-module, and the maximum charging parameters of the battery module included in each sub-module; wherein each sub-module is used for exchanging electrical energy with the power grid system; and a control module for controlling the switching state of the sub-modules in the new energy storage system based on the at least two comprehensive capability parameters.

[0022] Fourthly, this application provides an electronic device comprising: a determining module, configured to determine the comprehensive capability parameters of a target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule; and a communication module, configured to transmit the comprehensive capability parameters of the target submodule to a valve control device; wherein the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching status of the submodules in the new energy storage system.

[0023] Fifthly, this application provides a valve control device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described in any of the first aspects above.

[0024] In a sixth aspect, this application provides a control device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described in any of the second aspects above.

[0025] In a seventh aspect, this application provides a control system, including a valve control device according to the fifth aspect and at least two control devices according to the sixth aspect, wherein the at least two control devices are connected to the valve control device; and the at least two control devices are connected one-to-one with at least two cascaded sub-modules.

[0026] Eighthly, this application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the methods described above.

[0027] Ninthly, this application provides a computer program product, including a computer program, wherein when the computer program is executed by a processor, it implements the steps of any of the above methods. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments or some situations of this application, the drawings used in the description of the embodiments or some situations of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is a schematic diagram of a new energy storage system provided in some embodiments;

[0030] Figure 2 is a schematic diagram of the control system provided in some embodiments;

[0031] Figure 3 is a flowchart illustrating the control method of the new energy storage system provided in the first embodiment;

[0032] Figure 4 is a flowchart illustrating the control method of the new energy storage system provided in the second embodiment;

[0033] Figure 5 is a flowchart illustrating the control method of the new energy storage system provided in the third embodiment;

[0034] Figure 6 is a flowchart illustrating the control method of the new energy storage system provided in the fourth embodiment;

[0035] Figure 7 is a flowchart illustrating the control method of the new energy storage system provided in the fifth embodiment;

[0036] Figure 8 is a schematic diagram of the structure of an electronic device provided in some embodiments;

[0037] Figure 9 is a schematic diagram of the structure of an electronic device provided in some other embodiments;

[0038] Figure 10 is a schematic diagram of the structure of an electronic device provided in some embodiments. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0042] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] Currently, judging from market trends, energy storage systems are being used more and more widely, bringing great convenience to daily production and life. Among various energy storage technologies, new energy storage systems, due to their highly modular structure, can meet the requirements of high efficiency, high reliability, economy, and safety, and are gradually being developed and applied.

[0045] The new energy storage system includes a converter and at least two cascaded sub-modules connected to the converter. The converter is also connected to the power grid system to enable the power grid system to exchange electrical energy with the sub-modules.

[0046] In some cases, the power dispatch of new energy storage systems is often based on experience, resulting in low accuracy in power dispatch.

[0047] To alleviate the aforementioned problems, research has revealed that by controlling the switching status of submodules in a new energy storage system based on the power demand parameters of the power grid system, the output power parameters of the new energy generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule, the power dispatching of the new energy storage system can be determined according to the power demand of the power grid system and the current actual status of the submodules. This eliminates the problem of low accuracy in power dispatching of new energy storage systems caused by relying on experience in the past, thereby improving the accuracy of power dispatching of new energy storage systems.

[0048] Based on the above considerations, this application provides a control method for a new energy storage system. The method includes: acquiring the comprehensive capability parameters of each submodule in at least two cascaded submodules within the new energy storage system; the comprehensive capability parameters of each submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy generation module included in each submodule, and the maximum charging parameters of the battery module included in each submodule; wherein each submodule is used for energy exchange with the power grid system; and controlling the switching state of the submodules in the new energy storage system according to the at least two comprehensive capability parameters. In this way, the switching control strategy of the submodules is determined according to the demand of the power grid system and the current actual state of the submodules, thus ensuring that the energy dispatch of the new energy storage system meets the needs of real-world scenarios. This eliminates the problem of low accuracy in energy dispatching of new energy storage systems caused by relying on experience in the past. Therefore, the embodiments of this application can improve the accuracy of energy dispatching of new energy storage systems.

[0049] The new energy storage system of this application has no single application scenario. It can be a high-voltage direct-connected energy storage scenario, a medium-high voltage AC cascaded energy storage scenario, a modular multilevel converter (MMC) AC energy storage scenario, or a low-voltage energy storage scenario, etc. There is no limitation in this regard.

[0050] Figure 1 is a schematic diagram of a new energy storage system provided in some embodiments. As shown in Figure 1, the new energy storage system includes a converter device 11 (e.g., a converter or converter station) and at least two cascaded sub-modules 12 (including SM1, SM2, SM3 up to SMK) connected in series with the converter device 11. Exemplarily, in the embodiment shown in Figure 1, K is an integer greater than or equal to 3; in other embodiments, K is an integer greater than or equal to 1. SM represents a slave module. Each sub-module 12 includes an energy storage sub-module 121, a new energy power generation module 122, and a converter 123. The energy storage sub-module 121 and the new energy power generation module 122 are connected through the converter 123. Exemplarily, the converter 123 may include a direct current / direct current (DC / DC) converter or an alternating current / direct current (AC / DC) converter. The energy storage submodule 121 includes a power module 1211 and a battery module 1212. One end of the battery module 1212 is connected to the power module 1211, and the other end of the battery module 1212 is connected to the new energy power generation module 122. The converter device 11 can control the magnitude of the current (also called the system current) flowing through at least two cascaded energy storage submodules 12.

[0051] For example, power module 1211 is a device for power conversion. By controlling the closing or opening state of the control switch in power module 1211, the switching of submodule 12 can be realized. Battery module 1212 is a device for storing and releasing electrical energy. New energy power generation module 122 is a device capable of generating electricity through new energy technologies. New energy power generation module 122 can charge battery module 1212 of submodule and can also directly output electrical energy to the power grid system to supply power to the power grid system. Power module 1211 can be a half-bridge power module or a full-bridge power module depending on actual needs, and there is no limitation in this regard. Figure 1 illustrates a half-bridge power module. Battery module 1212 can be a single battery or a battery pack formed by connecting at least two batteries in series and / or in parallel, and there is no limitation in this regard. For example, new energy power generation module 122 can include photovoltaic power generation module, wind power generation module, hydropower generation module, tidal power generation module, or biomass power generation module, etc.

[0052] For example, the converter 11 may include a voltage source converter (VSC). In the DC / DC converter, common non-isolated DC / DC converter boost circuits, buck circuits, and common isolated converters such as phase-shifted full-bridge converters can all be used, with the aim of controlling the output of the photovoltaic power generation module through maximum power point tracking (MPPT) control. The wind power generation module is connected in parallel with the battery module via an AC / DC converter; common AC / DC converters can be used, with the aim of controlling the output of the wind power generation module through MPPT control. For example, in a single submodule, the battery module may be composed of a cabinet consisting of at least two cells connected in series and parallel, connected in parallel.

[0053] In some embodiments, a control system may also be provided, which includes at least two control devices (also called submodule control devices or submodule controllers, not shown in Figure 1), each control device corresponding to a submodule, and each submodule being controlled by a corresponding control device.

[0054] Figure 2 is a schematic diagram of the structure of a control system provided in some embodiments. As shown in Figures 1 and 2, the control system includes a valve control device (also called a main control device, valve control or valve control system) and at least two control devices (e.g., control device 1, control device 2 up to control device K), and at least two control devices are connected to the valve control device.

[0055] For example, at least two submodules are connected one-to-one with at least two control devices, so that each control device can control the switching of a corresponding submodule. Both control devices are connected to valve control devices, enabling the valve control devices to communicate with each control device. For example, the valve control devices may be included in the converter unit.

[0056] In other embodiments, at least two submodules and at least two control devices can satisfy a many-to-one correspondence, with one control device controlling the corresponding at least two submodules. For example, different control devices control different submodules.

[0057] In some embodiments, the valve control device receives comprehensive capability parameters of corresponding sub-modules from at least two control devices, and controls the switching state of the sub-modules based on these comprehensive capability parameters. In some embodiments, the valve control device receives battery capability parameters of the battery modules in the corresponding sub-modules from at least two control devices, and controls whether the new energy power generation module in each subsystem charges the battery module based on the battery capability parameters of the battery modules in each sub-module.

[0058] In other embodiments, the valve control device determines the comprehensive capability parameters of each submodule based on the power demand parameters of the power grid system, the output power parameters of the renewable energy generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule. Based on these comprehensive capability parameters, the device controls the switching status of the submodules. In some embodiments, the valve control device determines the battery capability parameters of the battery modules in at least two submodules and controls whether the renewable energy generation modules in each subsystem charge the battery modules based on these battery capability parameters.

[0059] Figure 3 is a flowchart illustrating the control method for the new energy storage system provided in the first embodiment. This method is applied to valve control equipment and includes:

[0060] S301. Obtain the comprehensive capability parameters of each submodule in at least two cascaded submodules of the new energy storage system; the comprehensive capability parameters of each submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule.

[0061] Each submodule is used to exchange electrical energy with the power grid system.

[0062] In some embodiments, the comprehensive capability parameter of a submodule can represent the available score of the submodule under the charging and discharging power demand of the power grid system. In some embodiments, the comprehensive capability parameter of a submodule is determined by comprehensively evaluating the output capability of the new energy power generation module and the battery performance of the battery module. In some embodiments, the comprehensive capability parameter may include at least one of the following: available score, normalized parameter of comprehensive capability, capability parameter, state of Y (SOY), etc.

[0063] In some embodiments, power demand parameters may include at least one of the following: current, voltage, power, etc. In some embodiments, power demand parameters of a power grid system may represent the power demand situation of the power grid system. For example, power demand parameters of a power grid system may represent the power absorption demand and required power parameters of the power grid system, or may represent the power output demand and provided power parameters of the power grid system.

[0064] In some embodiments, electrical parameters may include at least one of the following: current, voltage, power, etc.

[0065] In some implementations, the output power parameters of the new energy power generation module may include the output current, output voltage, or output power of the new energy power generation module.

[0066] In some embodiments, the maximum charging parameters of the battery module may include the maximum charging current, maximum charging voltage, or maximum charging power of the battery module.

[0067] For example, as shown in Figure 1, the comprehensive capability parameters of sub-modules (SM1, SM2, SM3 up to SMK) in the new energy storage system are obtained. The comprehensive capability parameters of sub-module SMk (k is an integer greater than or equal to 1 and less than or equal to K) are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation module in sub-module SMk, and the maximum charging parameters of the battery module in SMk.

[0068] In some embodiments, the valve-controlled device can receive comprehensive capability parameters of a submodule sent by the control device. For example, each of at least two control devices can acquire the comprehensive capability parameters of a corresponding submodule and report these parameters to the valve-controlled device. For instance, each control device can determine the comprehensive capability parameters of a submodule based on the power demand parameters of the power grid system received from the valve-controlled device, the output power parameters of the new energy power generation module collected from the corresponding submodule, and the maximum charging parameters of the battery module.

[0069] In other embodiments, the valve control device can determine the comprehensive capability parameters of each submodule based on the power demand parameters of the power grid system, the output power parameters of the renewable energy generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule. For example, each of at least two control devices can send the power parameters of the submodule collected by the corresponding submodule (including the output power parameters of the renewable energy generation modules and the maximum charging parameters of the battery modules) to the valve control device. Thus, the valve control device determines the comprehensive capability parameters of the submodule based on the power demand parameters of the power grid system and the power parameters of the submodule collected by the submodule. Again, for example, the valve control device collects the output power parameters of the renewable energy generation modules included in each submodule and the maximum charging parameters of the battery modules included in each submodule, and then determines the comprehensive capability parameters of each submodule based on the power demand parameters of the power grid system, the output power parameters of the renewable energy generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule.

[0070] The following are various implementation methods for determining the comprehensive capability parameters of submodules in valve-controlled or control devices:

[0071] In some embodiments, the available power parameters of each submodule are determined based on the output power parameters of the new energy power generation module included in each submodule and the maximum charging parameters of the battery module included in each submodule. The comprehensive capability parameters of the submodule are then determined based on the available power parameters of each submodule and the power demand parameters of the power grid system. For example, when the power demand of the power grid system represents the power absorption demand of the power grid system, the comprehensive capability parameters of the submodule are determined based on the output power parameters included in the available power parameters of each submodule. As another example, when the power demand of the power grid system represents the power output demand of the power grid system, the comprehensive capability parameters of the submodule are determined based on the chargeable power parameters included in the available power parameters of each submodule.

[0072] In other embodiments, when the power parameter demand of the power grid system represents the power absorption demand of the power grid system, the comprehensive capability parameters of the submodule are determined based on the output power parameters of the new energy power generation module; when the power parameter demand of the power grid system represents the power output demand of the power grid system, the comprehensive capability parameters of the submodule are determined based on the output power parameters of the new energy power generation module and the maximum charging parameters of the battery module.

[0073] There are other ways to determine the comprehensive capability parameters of submodules, which will not be listed one by one in the embodiments of this application.

[0074] S302. Control the switching status of sub-modules in the new energy storage system based on at least two comprehensive capability parameters.

[0075] A submodule can be in an "on" or "off" state. An "on" state indicates that the submodule can exchange energy with the power grid, while an "off" state indicates that the submodule cannot exchange energy with the power grid. Controlling the on / off state of submodules in a renewable energy storage system can include controlling the on / off state of each submodule within the system.

[0076] In some embodiments, the valve control device can control the switching status of submodules in the new energy storage system by closing or opening corresponding control switches in the submodules. In other embodiments, the valve control device can send activation or deactivation commands to each control device, so that the control device can control the switching status of submodules in the new energy storage system by closing or opening corresponding control switches in the submodules.

[0077] In some embodiments, the switching status of sub-modules (SM1, SM2, SM3 up to SMK) in the new energy storage system is controlled based on the comprehensive capability parameters of the sub-modules (SM1, SM2, SM3 up to SMK). The control of each sub-module (SM1, SM2, SM3 up to SMK) is independent.

[0078] In some embodiments, S302 can be implemented by controlling the switching status of submodules in the new energy storage system based on at least two comprehensive capability parameters and the power demand parameters of the power grid system.

[0079] In other embodiments, S302 can be implemented by controlling the switching state of submodules in the new energy storage system based on at least two comprehensive capability parameters and the required quantity of submodules. For example, the required quantity of submodules can be determined based on the power demand parameters of the power grid system. Also for example, the valve control device can receive a first control command from the target device, which is generated by the target device in response to the user-inputted required quantity, and determine the required quantity of the submodules as the quantity carried in the first control command.

[0080] In some other embodiments, S302 can be implemented by controlling a preset number of sub-modules in the new energy storage system to be in an "activated" state, and controlling the remaining sub-modules to be in a "cut-off" state, based on at least two comprehensive capability parameters. For example, the preset number can be pre-configured in the valve control device. Also for example, the valve control device can receive a second control command from the target device, which is generated by the target device in response to a user-inputted quantity, and determine the user-inputted quantity carried in the second control command as the preset number.

[0081] In the technical solution of this application embodiment, the switching status of sub-modules in the new energy storage system can be controlled according to the power demand parameters of the power grid system, the output power parameters of the new energy power generation modules included in each sub-module, and the maximum charging parameters of the battery modules included in each sub-module. That is, the switching control strategy of the sub-module is determined according to the demand of the power grid system and the current real state of the sub-module. Thus, the power dispatch of the new energy storage system meets the needs of the real scenario, and abandons the problem of low accuracy of power dispatch of the new energy storage system caused by relying on experience in the past. In this way, the embodiment of this application can improve the accuracy of power dispatch of the new energy storage system.

[0082] Figure 4 is a flowchart illustrating the control method for a new energy storage system provided in the second embodiment. This method is applied to valve control equipment. The difference between this method and the embodiment in Figure 3 is that S302 includes S3021 and S3022:

[0083] S3021. Sort at least two comprehensive capability parameters.

[0084] S3022. Based on the sorted comprehensive capability parameters, control the switching status of sub-modules in the new energy storage system.

[0085] For example, the synthesis capability parameters of the sub-modules (SM1, SM2, SM3 up to SMK) are sorted. In some implementations, sorting at least two synthesis capability parameters may include sorting the at least two synthesis capability parameters from largest to smallest or from smallest to largest.

[0086] In the technical solution of this application embodiment, different comprehensive capability parameters represent different availability of sub-modules. The switching status of sub-modules is controlled according to the order of their availability. This is beneficial for prioritizing the selection of sub-modules with better availability and improves the effectiveness of power dispatching in the new energy storage system.

[0087] Figure 5 is a flowchart illustrating the control method for a new energy storage system provided in the third embodiment. This method is applied to valve control equipment. The difference between this method and the embodiment in Figure 4 is that S3022 includes S3022a, S3022b, and S3022c:

[0088] S3022a. Determine the required number of sub-modules based on the power demand parameters of the power grid system.

[0089] S3022b. Determine the available number of submodules based on the comprehensive capability parameters of each submodule.

[0090] S3022c: Control the switching status of sub-modules in the new energy storage system based on the available quantity, the required quantity, and the sorted comprehensive capacity parameters.

[0091] For example, in a new energy storage system, the output voltage of each submodule is within a preset voltage range, thereby allowing the required number of submodules to be determined based on the grid system's demand voltage and / or power demand. Taking the grid system's power demand parameter as the grid system's demand voltage as an example, the implementation of the scheme for determining the required number of submodules is explained: In some implementations, the required number of submodules can be determined based on the grid system's demand voltage and the maximum, minimum, or average value of each submodule's output voltage. In other implementations, the required number of submodules can be determined based on the grid system's demand voltage and the maximum, minimum, or average value of a preset voltage range.

[0092] In some implementations, determining the available number of submodules based on the comprehensive capability parameters of each submodule may include: determining the number of submodules corresponding to comprehensive capability parameters that are not the target value or are greater than the target value as the available number of submodules.

[0093] In other implementations, determining the available number of submodules based on the comprehensive capability parameters of each submodule may include: determining the number of submodules corresponding to comprehensive capability parameters greater than a preset value as the available number of submodules. Here, the preset value is greater than the target value.

[0094] In some implementations, the switching status of submodules in a new energy storage system can be controlled based on the relationship between the available quantity and the required quantity, as well as based on the sorted comprehensive capability parameters.

[0095] In the technical solution of this application embodiment, the required quantity of submodules is dynamically adjusted according to the power demand parameters of the power grid system, and the available quantity of submodules is dynamically adjusted according to the comprehensive capability parameters of each submodule. Thus, the switching status of submodules in the new energy storage system is dynamically controlled according to the available quantity and the required quantity, thereby improving the flexibility of submodule switching operation. Furthermore, the control of the switching status of submodules can match the power demand parameters of the power grid system and the comprehensive capability parameters of the submodules, improving the accuracy of power dispatching of the new energy storage system.

[0096] In some embodiments, the switching status of submodules in the new energy storage system is controlled based on the available quantity, the demand quantity, and the sorted comprehensive capability parameters, including: when the available quantity is less than the demand quantity, controlling all submodules in the new energy storage system to be in a locked state.

[0097] In some embodiments, the switching status of submodules in the new energy storage system is controlled based on the available quantity, the demand quantity, and the sorted comprehensive capacity parameters, including: when the available quantity equals the demand quantity, controlling the available submodules in the new energy storage system to be in the activated state.

[0098] In some embodiments, the switching status of sub-modules in a new energy storage system is controlled based on the available quantity, the demand quantity, and the sorted comprehensive capability parameters, including: when the available quantity is greater than the demand quantity, the switching status of sub-modules in the new energy storage system is controlled based on the sorted comprehensive capability parameters.

[0099] In this context, "locked-out state" refers to a state where the system is automatically disconnected or cannot be started. By controlling all submodules in the new energy storage system to be in a locked-out state, all submodules in the new energy storage system cannot exchange energy with the grid system. This reduces the impact on grid stability caused by the power parameters provided by the new energy storage system not meeting the power demand parameters of the grid system when the available quantity is less than the demand quantity. Therefore, controlling all submodules in the new energy storage system to be in a locked-out state when the available quantity is less than the demand quantity can improve the stability of the grid system.

[0100] In some implementations, when the available quantity equals the demand quantity, the available sub-modules in the new energy storage system are controlled to be in the "on" state, and the unavailable sub-modules are controlled to be in the "off" state.

[0101] In the technical solution of this application embodiment, the sub-module is controlled to switch in different ways according to the different size relationships between the available quantity and the demand quantity. In this way, the switching scheme of the sub-module can take into account the size relationship between the available quantity and the demand quantity, thereby improving the accuracy of power dispatching of the new energy storage system.

[0102] The following explains how to control the switching status of sub-modules in a new energy storage system based on the sorted comprehensive capability parameters:

[0103] In some embodiments, controlling the switching status of sub-modules in a new energy storage system based on sorted comprehensive capability parameters includes: determining a first difference between the largest and smallest comprehensive capability parameters; and controlling the switching status of sub-modules in the new energy storage system based on the first difference and the sorted comprehensive capability parameters.

[0104] Among them, the largest comprehensive capability parameter is the largest parameter among the comprehensive capability parameters of at least two sub-modules in the new energy storage system, and the smallest comprehensive capability parameter is the smallest parameter among the comprehensive capability parameters of at least two sub-modules in the new energy storage system.

[0105] In the technical solution of this application embodiment, the first difference represents the balance degree of the sub-module in the new energy storage system. When the first difference is large, it means that the balance degree of the sub-module is lower, and when the first difference is small, it means that the balance degree of the sub-module is higher. In this way, by controlling the switching state of the sub-module through the balance degree of the sub-module, it is beneficial to improve the balance degree of the sub-module and improve the operational stability of the sub-module in the new energy storage system.

[0106] In some embodiments, the switching status of sub-modules in the new energy storage system is controlled according to the first difference and the sorted comprehensive capability parameters, including: when the first difference is greater than or equal to the target threshold, the sub-modules corresponding to the first N comprehensive capability parameters are controlled to be in the input state, and the sub-modules corresponding to the remaining comprehensive capability parameters are controlled to be in the cut-off state, according to the comprehensive capability parameters sorted from largest to smallest; N is the required number of sub-modules.

[0107] In some embodiments, controlling the switching status of sub-modules in the new energy storage system based on a first difference and sorted comprehensive capability parameters includes: when the first difference is less than a target threshold, controlling the switching status of M sub-modules based on sorted comprehensive capability parameters; M is the difference between the required number of sub-modules and the number already put into operation.

[0108] In some embodiments, the target threshold may be preset and stored in the valve control device. In some embodiments, the target threshold may be flexibly selected from at least two thresholds stored in the valve control device according to the balance requirements of the submodule. For example, when the balance requirements of the submodule are high, the selected target threshold may be larger, and when the balance requirements of the submodule are low, the selected target threshold may be smaller.

[0109] In the technical solution of this application embodiment, when the first difference is greater than or equal to the target threshold, it indicates that the balance of the sub-modules is poor. Investing the N sub-modules with the highest comprehensive capability parameters not only helps reduce the difference between the comprehensive capability parameters of these N sub-modules and the remaining sub-modules, but also improves the availability of the sub-modules as their comprehensive capability parameters increase, thereby enhancing the effectiveness of power dispatching in the new energy storage system. When the first difference is less than the target threshold, it indicates that the balance of the sub-modules is good. Controlling the switching status of M sub-modules based on the sorted comprehensive capability parameters not only helps reduce the difference between the comprehensive capability parameters of these M sub-modules and the remaining sub-modules, but also eliminates the need to change the investment status of the already invested sub-modules, reducing fluctuations in the power parameters of the new energy storage system caused by switching statuses, and improving the operational stability of the new energy storage system.

[0110] In some embodiments, controlling the deployment status of M sub-modules according to the sorted comprehensive capability parameters includes: when M is greater than the target value, controlling the sub-modules corresponding to the first M comprehensive capability parameters to be in the deployment state according to the comprehensive capability parameters of the undeployed sub-modules sorted from largest to smallest.

[0111] In some embodiments, controlling the deployment and switching status of M sub-modules according to the sorted comprehensive capability parameters includes: when M is less than or equal to the target value, controlling the sub-modules corresponding to the first M comprehensive capability parameters to be in the cut-out state according to the comprehensive capability parameters of the deployed sub-modules sorted from smallest to largest.

[0112] In some embodiments, the target value is 0. In other embodiments, the target value can be other values, for example, a value greater than 0, such as 1, 2, or 3.

[0113] In the technical solution of this application embodiment, the switching status of M sub-modules is controlled according to whether the difference between the required quantity and the already deployed quantity (i.e., M) of the sub-modules is greater than the target value. Thus, the switching status of the sub-modules can be determined according to the required quantity and the already deployed quantity of the sub-modules, which improves the effectiveness of power dispatching of the new energy storage system. In addition, the sub-modules corresponding to the top M highest comprehensive capability parameters are controlled to be in the deployed state, and the sub-modules corresponding to the top M lowest comprehensive capability parameters are controlled to be in the disconnected state, thereby prioritizing the deployment of sub-modules with high comprehensive capability parameters and improving the effectiveness of power dispatching of the new energy storage system.

[0114] In some embodiments, the method further includes: obtaining battery capability parameters of the battery modules in the setting submodule, which includes at least one submodule; setting the state of each submodule in the submodule to a cut-out state or a locked state; controlling the new energy power generation module in the first submodule to operate in a state of energy waste; the first submodule is a submodule whose battery capability parameters are less than or equal to a target value; controlling the new energy power generation module in the second submodule to charge the battery modules in the second submodule; the second submodule is a submodule whose battery capability parameters are greater than the target value.

[0115] In some embodiments, the battery capability parameters of a battery module can represent the available score of the battery system under the charging and discharging power demand of the power grid system. In some embodiments, the battery capability parameters of a battery module are determined based on an evaluation of the battery performance of the battery module during charging and discharging. For example, the battery capability parameters of the battery module are obtained through a weighted algorithm based on influencing factors such as the battery module's state of charge (SOC) and power capability parameters, and according to the weights assigned to each influencing factor. In some embodiments, the battery capability parameters may include at least one of the following: available score, normalized parameters of battery capability, capability parameters, state of X (SOX), etc.

[0116] For example, the first submodule includes at least one submodule, the second submodule includes at least one submodule, and the union of the first submodule and the second submodule is the set submodule.

[0117] In some embodiments, the valve control device can receive battery capability parameters of battery modules in at least two sub-modules respectively sent by at least two control devices, and determine, from the battery capability parameters of the battery modules in the at least two sub-modules, that the set sub-module includes battery capability parameters of at least one battery module. In other embodiments, the valve control device can acquire battery state of charge and battery power capability parameters of battery modules in at least two sub-modules; fuse the battery state of charge and battery power capability parameters of each sub-module to obtain the battery capability parameters of the battery modules in each sub-module. The valve control device can also determine, based on the battery capability parameters of the battery modules in each sub-module, that the set sub-module includes battery capability parameters of at least one battery module.

[0118] For example, the target value is 0 or other values ​​(e.g., 1, 2, or 3). Taking a target value of 0 as an example, a submodule with a battery capability parameter less than or equal to 0 indicates that the battery module is unusable, while a submodule with a battery capability parameter greater than 0 indicates that the battery module is usable.

[0119] In some embodiments, the valve control device can control whether the renewable energy generation module in the submodule operates under power curtailment by closing or opening corresponding control switches in the submodule. In other embodiments, the valve control device can send power curtailment commands to various control devices, so that the control devices can control whether the renewable energy generation module in the submodule operates under power curtailment by closing or opening corresponding control switches in the submodule.

[0120] In the technical solution of this application embodiment, the battery capacity parameter is a target value, indicating that power cannot be supplied to the battery module. By controlling the new energy power generation module in the sub-module with a battery capacity parameter less than or equal to the target value to abandon energy, the occurrence of battery module overcharging is reduced, which is beneficial to ensuring the reliability of the battery module. The battery capacity parameter is greater than the target value, indicating that power can be supplied to the battery module. By controlling the new energy power generation module in the sub-module with a battery capacity parameter greater than the target value to charge the battery module in the second sub-module, the electrical energy generated by the new energy power generation module can be effectively utilized. Therefore, in this application embodiment, while ensuring the reliability of the battery module, the electrical energy generated by the new energy power generation module is stored in the battery module as much as possible, thereby improving the efficiency of electrical energy utilization.

[0121] In some embodiments, the method further includes: determining the comprehensive capability parameters of each submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule.

[0122] In some embodiments, the method by which the valve control system determines the comprehensive capability parameters of a submodule is the same as the method by which the control device determines the comprehensive capability parameters of a submodule. The method by which the valve control system determines the comprehensive capability parameters of a submodule can refer to the method by which the target control device determines the comprehensive capability parameters of a target submodule as described below, and will not be repeated here.

[0123] In the technical solution of this application embodiment, the determination of the comprehensive capability parameters of the sub-module can comprehensively consider the power demand parameters of the power grid system, the output power parameters of the new energy power generation module, and the maximum charging parameters of the battery module, thereby improving the accuracy of the determined comprehensive capability parameters of the sub-module.

[0124] Figure 6 is a flowchart illustrating the control method for a new energy storage system provided in the fourth embodiment. This method is applied to a target control device and includes:

[0125] S401. Based on the obtained power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target sub-module, and the maximum charging parameters of the battery module in the target sub-module, determine the comprehensive capability parameters of the target sub-module.

[0126] Here, the target control device is the control device corresponding to the target submodule. For example, the target control device can be a single control device, and the target submodule is a submodule corresponding to the target control room.

[0127] For example, the target control device can receive power demand parameters of the power grid system sent by the valve control device. For example, the target device can collect the output power parameters of the new energy power generation module in the target submodule and the maximum charging parameters of the battery module in the target submodule from the target submodule.

[0128] For example, the valve control device can send the power demand parameters of the power grid system to the target control device once every preset period. The target control device can collect the output power parameters of the new energy power generation module in the target sub-module and the maximum charging parameters of the battery module in the target sub-module once every preset period. In this way, the target control device can obtain the power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target sub-module, and the maximum charging parameters of the battery module in the target sub-module every preset period.

[0129] The target control device determines the comprehensive capability parameters of the target sub-module in a similar way to how the valve control device determines the comprehensive capability parameters of each sub-module, or in a similar way to how each control device determines the comprehensive capability parameters of each corresponding sub-module. Therefore, the implementation method of the target control device in determining the comprehensive capability parameters of the target sub-module can be referred to in conjunction with the above description, and will not be repeated here.

[0130] S402. Send the comprehensive capability parameters of the target submodule to the valve control equipment; wherein, the comprehensive capability parameters of the target submodule are used by the valve control equipment to control the switching status of submodules in the new energy storage system. Correspondingly, the valve control equipment receives the comprehensive capability parameters of the target submodule sent by the target control equipment.

[0131] In some embodiments, there may also be a step S403, in which the valve control device controls the switching state of the submodule in the new energy storage system according to the comprehensive capability parameters of the target submodule.

[0132] In some embodiments, the target control device may determine the comprehensive capability parameters of the target submodule at preset intervals and send the comprehensive capability parameters of the target submodule to the valve control device.

[0133] In some implementation scenarios, the control system includes a valve control device, a target control device, and at least one other control device besides the target control device. The target control device and at least one other control device are included in the above-mentioned at least two control devices. Each of the at least two control devices determines the comprehensive capability parameters of the corresponding sub-module once every preset period and reports the determined comprehensive capability parameters of the sub-module to the valve control device. In this way, the valve control device can obtain the comprehensive capability parameters of at least two sub-modules and control the switching status of the sub-modules in the new energy storage system according to the comprehensive capability parameters of at least two sub-modules.

[0134] In some implementation scenarios, the target control device sends the comprehensive capability parameters of the target submodule to the valve control device, which may include active or passive transmission. For example, the target control device actively sends the comprehensive capability parameters of the target submodule to the valve control device every time it determines them. Another example is that, at each preset period, the valve control device sends a request to the target control device to obtain the comprehensive capability parameters, and the target control device provides the valve control device with the latest obtained comprehensive capability parameters of the target submodule.

[0135] For example, the power demand parameters of the power grid system can be sent from the valve control device to the target control device.

[0136] For example, the output power parameters of the new energy power generation module can be obtained from the MPPT controller or other controllers. For example, when the output power parameter is output power, the output power of the new energy power generation module can be obtained from the MPPT controller. For example, when the output power parameter is output current, the output current of the new energy power generation module can be obtained from the MPPT controller; alternatively, the output current of the new energy power generation module can be determined based on the output power of the new energy power generation module obtained from the MPPT controller and the collected voltage of the battery module. For example, the output power parameters of the new energy power generation module can be determined based on the power parameters at the output terminal of the new energy power generation module collected by the target control device.

[0137] For example, the maximum charging parameter of the battery module in the target submodule can be determined based on the power parameters of the battery module collected by the target control device. For example, the maximum charging parameter of the battery module in the target submodule can be preset. For instance, it can be determined based on the characteristics of the battery module.

[0138] In some implementations, the target control device can determine the available power parameters of the target submodule based on the output power parameters of the new energy power generation module and the maximum charging parameters of the battery module in the target submodule, and determine the comprehensive capability parameters of the target submodule based on the available power parameters of the target submodule and the power demand parameters of the power grid system.

[0139] In other embodiments, when the power demand parameters of the power grid system represent the power absorption demand of the power grid system, the target control device can determine the comprehensive capability parameters of the target submodule based on the output power parameters of the new energy power generation modules included in the target submodule; when the power demand parameters of the power grid system represent the power output demand of the power grid system, the target control device can determine the comprehensive capability parameters of the target submodule based on the output power parameters of the new energy power generation modules included in the target submodule and the maximum charging parameters of the battery modules included in the power parameters of the target submodule.

[0140] There are other ways to determine the comprehensive capability parameters of the target submodule, which will not be listed one by one in the embodiments of this application.

[0141] It should be noted that the method by which valve control equipment determines the comprehensive capability parameters of each submodule, or each control device determines the comprehensive capability parameters of its corresponding submodule, can refer to the method by which the target control device determines the comprehensive capability parameters of its target submodule.

[0142] In the technical solution of this application embodiment, the target control device sends the comprehensive capability parameters of the target submodule to the valve control device, so that the valve control device controls the switching state of the submodule in the new energy storage system. Compared with the scheme where the valve control device not only determines the comprehensive capability parameters of the submodule, but also controls the switching state of the submodule in the new energy storage system based on the comprehensive capability parameters of the submodule, this not only reduces the computational burden on the valve control device, but also allows for the addition or deletion of the corresponding control device when adding or deleting submodules without requiring large-scale modifications to the valve control device, thus enhancing the scalability of the new energy storage system. Furthermore, the determination of the comprehensive capability parameters of the submodule can comprehensively consider the power demand parameters of the power grid system, the output power parameters of the new energy power generation module, and the maximum charging parameters of the battery module, thereby improving the accuracy of the determined comprehensive capability parameters of the submodule.

[0143] The following describes some implementation methods for determining the overall capability parameters of the target submodule:

[0144] In some implementations, when the power demand parameters of the power grid system represent the power absorption demand of the power grid system, the comprehensive capability parameters of the target submodule are determined based on a second difference between the output power parameters of the new energy power generation module and the maximum charging parameters of the battery module. In some implementations, when the power demand parameters of the power grid system represent the power output demand of the power grid system, the comprehensive capability parameters of the target submodule are determined based on a third difference between the maximum charging parameters of the battery module and the output power parameters of the new energy power generation module.

[0145] The following describes the determination scheme of the comprehensive capability parameters of the target submodule when the power demand parameters of the power grid system represent the power absorption demand or power output demand of the power grid system. Taking the power demand parameters including demand current, output power parameters including output current, and maximum charging parameters including maximum charging current as examples, the scheme for determining the comprehensive capability parameters of the target submodule is explained. In other embodiments, the power demand parameters, output power parameters, and maximum charging parameters can be demand voltage, output voltage, and maximum charging voltage, respectively, or the power demand parameters, output power parameters, and maximum charging parameters can be demand power, output power, and maximum charging power, respectively. Under such schemes, the scheme for determining the comprehensive capability parameters of the target submodule based on demand voltage, output voltage, and maximum charging voltage, or based on demand power, output power, and maximum charging power, can be similar to the scheme for determining the comprehensive capability parameters of the target submodule based on demand current, output current, and maximum charging current. For example, the current can be replaced with voltage or power. This application embodiment will not elaborate on this.

[0146] In some embodiments, the comprehensive capability parameters of the target submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule. This includes: determining a second difference between the output current of the new energy power generation module and the maximum charging current of the battery module when the demand current of the power grid system represents the power absorption demand of the power grid system; and determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the second difference.

[0147] The second difference is the result of subtracting the maximum charging current of the battery module from the output current of the new energy power generation module.

[0148] For example, when the demand current of the power grid system is positive, it indicates that the power grid system absorbs power demand; conversely, when the demand current of the power grid system is negative, it indicates that the power grid system generates power demand. As another example, when the demand current of the power grid system is negative, it indicates that the power grid system absorbs power demand; conversely, when the demand current of the power grid system is positive, it indicates that the power grid system generates power demand.

[0149] In some embodiments, determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the second difference includes: when the demand current of the power grid system is less than the second difference, determining the comprehensive capability parameters of the target submodule as a target value.

[0150] In some embodiments, determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the second difference includes: when the demand current of the power grid system is greater than or equal to the second difference, determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the output current of the new energy power generation module.

[0151] In the technical solution of this application embodiment, if the required current of the power grid system is less than the second difference, it indicates that the minimum current output by the target submodule to the power grid system is greater than the required current of the power grid system, and the output current of the target submodule cannot be matched with the required current of the power grid system. If the required current of the power grid system is greater than or equal to the second difference, it indicates that the minimum current output by the target submodule to the power grid system is less than the required current of the power grid system, and the output current of the target submodule can be matched with the required current of the power grid system. Therefore, based on whether the output current of the target submodule can be matched with the required current of the power grid system, the comprehensive capability parameters of the target submodule are determined, thereby improving the accuracy of the determined comprehensive capability parameters of the target submodule.

[0152] In some embodiments, determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the output current of the new energy power generation module includes: when the demand current of the power grid system is less than the output current of the new energy power generation module, determining the output capability parameters of the new energy power generation module to the power grid system based on the second difference and the theoretical maximum output current of the new energy power generation module; and determining the comprehensive capability parameters of the target submodule based on the output capability parameters.

[0153] For example, the theoretical maximum output current of the new energy power generation module can be predetermined and stored in the target control device.

[0154] In the technical solution of this application embodiment, the demand current of the power grid system is less than the output current of the new energy power generation module. The comprehensive capability parameters of the target sub-module can comprehensively consider the second difference between the output current of the new energy power generation module and the maximum charging current of the battery module, as well as the theoretical maximum output current of the new energy power generation module. Thus, the comprehensive capability parameters of the target sub-module are determined in accordance with the situation that the demand current of the power grid system is less than the output current of the new energy power generation module, thereby improving the accuracy of the determined comprehensive capability parameters of the target sub-module.

[0155] In some embodiments, the comprehensive capability parameters of the target submodule are determined based on the demand current of the power grid system and the output current of the new energy power generation module, including: when the demand current of the power grid system is greater than or equal to the output current of the new energy power generation module, the sum of the output current of the new energy power generation module and the obtained maximum discharge current of the battery module is determined as the total maximum output current of the target submodule; the comprehensive capability parameters of the target submodule are determined based on the demand current of the power grid system and the total maximum output current.

[0156] For example, the maximum discharge current of the battery module can be predetermined and stored in the target control device.

[0157] In some embodiments, determining the comprehensive capability parameter of the target submodule based on the demand current and total maximum output current of the power grid system includes: determining the comprehensive capability parameter of the target submodule to be zero when the demand current of the power grid system is greater than the total maximum output current of the target submodule.

[0158] In some embodiments, determining the comprehensive capability parameters of the target submodule based on the demand current and total maximum output current of the power grid system includes: when the demand current of the power grid system is less than or equal to the total maximum output current of the target submodule, determining the output capability parameters based on the output current of the new energy power generation module and the theoretical maximum output current of the new energy power generation module, and determining the comprehensive capability parameters of the target submodule based on the output capability parameters.

[0159] In the technical solution of this application embodiment, the demand current of the power grid system is greater than or equal to the output current of the new energy power generation module. The comprehensive capability parameter of the target sub-module can comprehensively consider the relationship between the demand current of the power grid system and the total maximum output current of the target sub-module. Based on this relationship, different methods are used to determine the comprehensive capability parameter of the target sub-module. Thus, the determined comprehensive capability parameter of the target sub-module conforms to the situation where the demand current of the power grid system is greater than or equal to the output current of the new energy power generation module, thereby improving the accuracy of the determined comprehensive capability parameter of the target sub-module.

[0160] The above describes an implementation method for determining the comprehensive capability parameters of a target submodule when the demand current of the power grid system represents the power absorption demand of the power grid system. The following describes an implementation method for determining the comprehensive capability parameters of a target submodule when the demand current of the power grid system represents the power output demand of the power grid system:

[0161] In some embodiments, the comprehensive capability parameters of the target submodule are determined based on the obtained power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule. This includes: determining a third difference between the maximum charging current of the battery module and the output current of the new energy power generation module when the demand current of the power grid system represents the power demand of the power grid system; and determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the third difference.

[0162] For example, the maximum charging current of the battery module can be predetermined and stored in the target control device.

[0163] In some embodiments, determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and a third difference includes: when the demand current of the power grid system is greater than the third difference, determining the comprehensive capability parameters of the target submodule as a target value.

[0164] In some embodiments, determining the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and a third difference includes: when the demand current of the power grid system is less than or equal to the third difference, determining the battery capability parameters of the battery module in the target submodule as the comprehensive capability parameters of the target submodule.

[0165] In the technical solution of this application embodiment, if the required current of the power grid system is greater than the third difference, it indicates that the required current provided by the power grid system is greater than the charging current of the battery module, and the current provided by the power grid system cannot be matched with the current required by the battery module. If the required current of the power grid system is less than or equal to the third difference, it indicates that the required current provided by the power grid system is less than or equal to the charging current of the battery module, and the current provided by the power grid system can be matched with the current required by the battery module. Therefore, based on whether the current provided by the power grid system and the current required by the battery module can be matched, the comprehensive capability parameters of the target submodule are determined, thereby improving the accuracy of the determined comprehensive capability parameters of the target submodule.

[0166] In some embodiments, the method further includes: acquiring the battery state of charge and battery power capability parameters of the battery module in the target submodule; fusing the battery state of charge and battery power capability parameters to obtain the battery capability parameters of the battery module in the target submodule; and sending the battery capability parameters of the battery module in the target submodule to the valve control device; wherein the battery capability parameters of the battery module in the target submodule are used by the valve control device to control the power supply status of the new energy power generation module in the target submodule to the battery module in the target submodule.

[0167] In some implementations, the battery power capability parameter of the battery module can represent the battery module's ability to receive power. For example, the battery power capability parameter may include the state of power (SOP).

[0168] In some implementations, the battery state of charge and battery power capability parameters can be weighted and fused (e.g., weighted summation or weighted average) using a first parameter and a second parameter respectively to obtain the battery capability parameters of the battery module in the target submodule. In some embodiments, the sum of the first parameter and the second parameter is 1. Exemplarily, both the first parameter and the second parameter can be 0.5, or the first parameter can be greater than or less than the second parameter.

[0169] In some implementations, the battery capability parameters of the battery module in the target submodule can be sent synchronously with the overall capability parameters of the target submodule. For example, the battery capability parameters of the battery module in the target submodule can be sent in the same signaling message as the overall capability parameters of the target submodule.

[0170] In the technical solution of this application embodiment, the battery capability parameters of the battery module can comprehensively consider the battery state of charge and battery power capability parameters of the battery module, thereby improving the accuracy of the determined battery capability parameters of the battery module. Furthermore, the target control device sends the battery capability parameters of the battery module in the target sub-module to the valve control device, so that the valve control device controls the power supply state of the new energy power generation module in the target sub-module to the battery module in the target sub-module, thereby helping to improve the power utilization efficiency.

[0171] In some embodiments, under the topology of a new energy storage system (e.g., a new energy direct-connected grid-connected energy storage system), by comparing the grid system's demand (i.e., power demand parameters) with the output capacity parameters of the new energy power generation modules and obtaining the power demand for the battery modules, the overall capacity of the new energy power generation modules and energy storage battery modules is integrated, the comprehensive capacity parameters of the sub-modules are sorted, and the switching of the sub-modules is controlled, so as to meet the needs of power balance and stable operation of the large power grid under the condition of minimal wind / solar curtailment.

[0172] In some embodiments, the comprehensive capability parameters of a submodule are obtained by comprehensively evaluating multiple factors, including the output capacity of the new energy power generation module, the power demand of the battery module, and the current state of the battery module. A method for calculating the comprehensive capability parameters of a submodule under different operating requirements of the power grid system is also provided.

[0173] In some embodiments, the control method for new energy storage systems provided in this application can be applied to modular new energy storage systems, solving the problem that in some cases, there is no solution for coordinated control of modular new energy storage systems.

[0174] In some embodiments, coordinated control of the new energy and energy storage systems can be achieved without human intervention, meeting the needs of the power grid system. Coordinated control of the new energy power generation module and battery module is achieved by controlling the switching on and off of each sub-module using valve control equipment.

[0175] In some embodiments, while meeting the needs of the power grid system, the goal is to minimize solar / wind curtailment. For example, a method for calculating the comprehensive capability parameters of submodules is proposed, along with a control strategy for prioritizing and switching in / out of submodules based on these parameters, effectively improving the availability and utilization rate of battery modules. For example, unless the number of available submodules does not meet the demand (i.e., the number of available submodules < the required number), the output of new energy sources remains in MPPT (Maximum Power Target Time). For example, even after switching out / locking out, the new energy storage system still assesses the SOX (State of X) of the battery modules within the submodules, effectively improving the availability and utilization rate of the energy storage battery modules and maximizing the utilization of power generated by new energy sources, thus reducing solar / wind curtailment.

[0176] The power grid system has both power absorption and power generation requirements, the battery module has both charging and discharging functions, and the new energy power generation module only has the function of outputting power. The control strategies of the embodiments in this application are discussed separately under corresponding operating conditions according to the different requirements of the power grid system.

[0177] Figure 7 is a flowchart illustrating the control method for the new energy storage system provided in the fifth embodiment. As shown in Figure 7, the method applies a control system and includes:

[0178] S501. Determine whether the power grid system is absorbing power demand or generating power demand.

[0179] Among them, the charging and discharging power demand P of the power grid system sys >0 (that is, the charging and discharging current demand of the power grid system I) sys >0) indicates that the power grid system is absorbing power demand. P sys <0(I sys <0 indicates that the power grid system is generating power.

[0180] When the power grid system is absorbing power demand, execute S502; when the power grid system is generating power demand, execute S503.

[0181] S502. Based on the second difference between the output current of each new energy power generation module and the maximum charging current of each battery module, determine the comprehensive capability parameters of each sub-module in the new energy storage system, and control the new energy storage system based on the comprehensive capability parameters of each sub-module.

[0182] S503. Based on the third difference between the maximum charging current of each battery module and the output current of each new energy power generation module, determine the comprehensive capability parameters of each sub-module in the new energy storage system, and control the new energy storage system based on the comprehensive capability parameters of each sub-module.

[0183] Based on the same inventive concept, this application also provides an electronic device for implementing the control method of the new energy storage system described above. The solution provided by this device is similar to the solution described in the above method; therefore, the limitations in the electronic device embodiments provided below can be found in the limitations of the control method for the new energy storage system described above, and will not be repeated here.

[0184] In an exemplary embodiment, FIG8 is a schematic diagram of the structure of an electronic device provided in some embodiments. As shown in FIG8, the electronic device 800 includes: an acquisition module 801, used to acquire the comprehensive capability parameters of each sub-module in at least two cascaded sub-modules in a new energy storage system; the comprehensive capability parameters of each sub-module are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation module included in each sub-module, and the maximum charging parameters of the battery module included in each sub-module; each sub-module is used to exchange power with the power grid system; and a control module 802, used to control the switching state of the sub-modules in the new energy storage system based on at least two comprehensive capability parameters.

[0185] In some embodiments, the control module 802 includes a sorting unit and a control unit. The sorting unit is used to sort at least two comprehensive capability parameters; the control unit is used to control the switching status of sub-modules in the new energy storage system according to the sorted comprehensive capability parameters.

[0186] In some embodiments, the control unit includes a quantity determination subunit and a control subunit. The quantity determination subunit is used to determine the required quantity of submodules based on the power demand parameters of the power grid system, and to determine the available quantity of submodules based on the comprehensive capability parameters of each submodule. The control subunit is used to control the switching status of submodules in the new energy storage system based on the available quantity, the required quantity, and the sorted comprehensive capability parameters.

[0187] In some embodiments, the control subunit is further configured to: control all submodules in the new energy storage system to be locked when the available quantity is less than the required quantity; control the available submodules in the new energy storage system to be activated when the available quantity is equal to the required quantity; and control the activation / deactivation status of the submodules in the new energy storage system according to the sorted comprehensive capability parameters when the available quantity is greater than the required quantity.

[0188] In some embodiments, the control unit includes a difference determination subunit and a control subunit. The difference determination subunit determines a first difference between the largest and smallest comprehensive capability parameters. The control subunit is used to control the switching status of submodules in the new energy storage system based on the first difference and the sorted comprehensive capability parameters.

[0189] In some embodiments, the control subunit is further configured to: when the first difference is greater than or equal to the target threshold, control the submodules corresponding to the first N comprehensive capability parameters to be in an "input" state, and control the submodules corresponding to the remaining comprehensive capability parameters to be in a "cut-out" state, based on the comprehensive capability parameters sorted from largest to smallest; where N is the required number of submodules; and when the first difference is less than the target threshold, control the "input" and "cut-out" states of M submodules based on the sorted comprehensive capability parameters; where M is the difference between the required number of submodules and the number already in use.

[0190] In some embodiments, the control subunit is further configured to: when M is greater than the target value, control the submodules corresponding to the first M comprehensive capability parameters to be in an in-process state according to the comprehensive capability parameters of the uninvolved submodules sorted from largest to smallest; when M is less than or equal to the target value, control the submodules corresponding to the first M comprehensive capability parameters to be in a cut-out state according to the comprehensive capability parameters of the in-process submodules sorted from smallest to largest.

[0191] In some embodiments, the acquisition module 801 is further configured to acquire battery capability parameters of the battery modules in at least one submodule of the setting submodule; and set the state of each submodule in the setting submodule to a cut-out state or a locked state; the control module 802 is further configured to: control the new energy power generation module in the first submodule to operate under energy curtailment; the first submodule is a submodule whose battery capability parameters are of a target value; and control the new energy power generation module in the second submodule to charge the battery modules in the second submodule; the second submodule is a submodule whose battery capability parameters are greater than the target value.

[0192] In one exemplary embodiment, FIG9 is a schematic diagram of the structure of an electronic device provided in other embodiments. As shown in FIG9, the electronic device 900 includes: a determining module 901, used to determine the comprehensive capability parameters of a target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule; and a communication module 902, used to send the comprehensive capability parameters of the target submodule to a valve control device; wherein, the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching status of the submodules in the new energy storage system.

[0193] In some embodiments, the power demand parameter includes the demand current, the output power parameter includes the output current, and the maximum charging parameter includes the maximum charging current; the determining module 901 includes a difference determining unit and a comprehensive capability parameter determining unit. The difference determining unit is used to determine a second difference between the output current of the new energy power generation module and the maximum charging current of the battery module when the demand current of the power grid system represents the power absorption demand of the power grid system; the comprehensive capability parameter determining unit is used to determine the comprehensive capability parameter of the target submodule as a target value when the demand current of the power grid system is less than the second difference; and to determine the comprehensive capability parameter of the target submodule based on the demand current of the power grid system and the output current of the new energy power generation module when the demand current of the power grid system is greater than or equal to the second difference.

[0194] In some embodiments, the comprehensive capability parameter determination unit includes an output capability parameter determination subunit and a comprehensive capability parameter determination subunit. The output capability parameter determination subunit is used to determine the output capability parameters of the new energy power generation module to the power grid system based on a second difference and the theoretical maximum output current of the new energy power generation module when the demand current of the power grid system is less than the output current of the new energy power generation module. The comprehensive capability parameter determination subunit is used to determine the comprehensive capability parameters of the target submodule based on the output capability parameters.

[0195] In some embodiments, the comprehensive capability parameter determination unit includes a total maximum output current determination subunit and a comprehensive capability parameter determination subunit. The total maximum output current determination subunit is used to determine the total maximum output current of the target submodule by summing the output current of the new energy power generation module and the obtained maximum discharge current of the battery module when the demand current of the power grid system is greater than or equal to the output current of the new energy power generation module. The comprehensive capability parameter determination subunit is used to determine the comprehensive capability parameter of the target submodule to be zero when the demand current of the power grid system is greater than the total maximum output current of the target submodule; and to determine the output capability parameter based on the output current of the new energy power generation module and the theoretical maximum output current of the new energy power generation module when the demand current of the power grid system is less than or equal to the total maximum output current of the target submodule, and to determine the comprehensive capability parameter of the target submodule based on the output capability parameter.

[0196] In some embodiments, the power demand parameter includes the demand current, the output power parameter includes the output current, and the maximum charging parameter includes the maximum charging current; the determining module 901 includes a difference determining unit and a comprehensive capability parameter determining unit. The difference determining unit is used to determine a third difference between the maximum charging current of the battery module and the output current of the new energy power generation module when the demand current of the power grid system represents the power demand of the power grid system; the comprehensive capability parameter determining unit is used to: determine the comprehensive capability parameter of the target submodule as a target value when the demand current of the power grid system is greater than the third difference; and determine the battery capability parameter of the battery module in the target submodule as the comprehensive capability parameter of the target submodule when the demand current of the power grid system is less than or equal to the third difference.

[0197] In some embodiments, the acquisition module 901 is further configured to acquire the battery state of charge and battery power capability parameters of the battery module in the target submodule; the determination module 901 is further configured to fuse the battery state of charge and battery power capability parameters to obtain the battery capability parameters of the battery module in the target submodule; the communication module 902 is further configured to send the battery capability parameters of the battery module in the target submodule to the valve control device; wherein, the battery capability parameters of the battery module in the target submodule are used by the valve control device to control the power supply status of the new energy power generation module in the target submodule to the battery module in the target submodule.

[0198] The descriptions of the above device embodiments are similar to those of the above method embodiments, and have similar beneficial effects. For technical details not disclosed in the device embodiments of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0199] Each module in the aforementioned electronic device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the controller in hardware form or independent of it, or stored in the memory of the controller in software form, so that the processor can call and execute the operations corresponding to each module.

[0200] In an exemplary embodiment, an electronic device is provided. Figure 10 is a schematic diagram of the structure of an electronic device provided in some embodiments. The electronic device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are connected to the system bus via the input / output interface. The processor of the electronic device provides computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the electronic device is used for exchanging information between the processor and external devices. The communication interface of the electronic device is used for wired or wireless communication with external terminals. Wireless communication can be achieved through Wireless Fidelity (WIFI), mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a control method for a new energy storage system. The display unit of the electronic device is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the electronic device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the electronic device, or external keyboards, touchpads, or mice, etc.

[0201] Electronic devices can be valve-controlled devices or control devices.

[0202] Those skilled in the art will understand that the structure shown in Figure 10 is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0203] For example, the electronic device is a valve-controlled device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement any of the steps of the method applied to the valve-controlled device described above. For instance, when the processor executes the computer program, it implements: acquiring the comprehensive capability parameters of each of at least two cascaded sub-modules in the new energy storage system; the comprehensive capability parameters of each sub-module are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy generation modules included in each sub-module, and the maximum charging parameters of the battery modules included in each sub-module; each sub-module is used to exchange power with the power grid system; and controlling the switching state of the sub-modules in the new energy storage system based on at least two comprehensive capability parameters.

[0204] For example, the electronic device is a control device, which includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements any of the steps of the method applied to the control device described above. For instance, when the processor executes the computer program, it implements: determining the comprehensive capability parameters of the target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule; and sending the comprehensive capability parameters of the target submodule to the valve control device; wherein the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching status of the submodules in the new energy storage system.

[0205] In one embodiment, a control system is provided, including the valve control device described above and at least one of the control devices described above; the at least one control device is connected to the valve control device.

[0206] In one embodiment, a computer-readable storage medium is provided, wherein a computer program, when executed by a processor, implements the steps of the method provided in any of the above embodiments.

[0207] For example, in one exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When executed by a processor, the computer program performs the following steps: obtaining the comprehensive capability parameters of each submodule in at least two cascaded submodules of a new energy storage system; the comprehensive capability parameters of each submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation module included in each submodule, and the maximum charging parameters of the battery module included in each submodule; each submodule is used to exchange power with the power grid system; and controlling the switching state of the submodules in the new energy storage system based on at least two comprehensive capability parameters.

[0208] For example, in one exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, it performs the following steps: determining the comprehensive capability parameters of the target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule; sending the comprehensive capability parameters of the target submodule to a valve control device; wherein the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching status of the submodules in the new energy storage system.

[0209] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method provided in any of the above embodiments.

[0210] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the methods described above.

[0211] The processor in any embodiment of this application may include an integration of any one or at least two of the following: a general-purpose processor, an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a central processing unit (CPU), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), a controller, a microcontroller, a microprocessor, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a quantum computing-based data processing logic device, an artificial intelligence (AI) processor, a decoding processor, etc. The processor can implement or execute the methods, steps, and logic block diagrams of the applications in this application.

[0212] The memory or computer-readable storage medium in any embodiment of this application may include at least one of non-volatile memory and volatile memory. Non-volatile memory includes integration of one or more of the following: Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Ferromagnetic Random Access Memory (FRAM), Flash Memory, Magnetic Surface Memory, Optical Disc, Compact Disc Read-Only Memory (CD-ROM), Magnetic Tape, Floppy Disk, Flash Memory, Optical Memory, High-Density Embedded Non-Volatile Memory, Resistive Random Access Memory (ReRAM), Magnetoresistive Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), and Phase Change Memory. Memory (PCM), graphene memory, volatile memory, etc. Volatile memory includes one or more of the following: Random Access Memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), etc.

[0213] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0214] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for a new energy storage system, the method comprising: Obtain the comprehensive capability parameters of each submodule in at least two cascaded submodules of the new energy storage system; The comprehensive capability parameters of each submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule; each submodule is used to exchange electrical energy with the power grid system. The switching status of the sub-modules in the new energy storage system is controlled based on at least two of the comprehensive capability parameters.

2. The method according to claim 1, wherein, The step of controlling the switching status of the sub-modules in the new energy storage system based on at least two of the comprehensive capability parameters includes: Sort at least two of the aforementioned comprehensive capability parameters; Based on the sorted comprehensive capability parameters, the switching status of the sub-modules in the new energy storage system is controlled.

3. The method according to claim 2, wherein, The step of controlling the switching status of the sub-modules in the new energy storage system according to the sorted comprehensive capability parameters includes: The required quantity of the sub-module is determined based on the power demand parameters of the power grid system. The number of available sub-modules is determined based on the comprehensive capability parameters of each sub-module; The switching status of the sub-modules in the new energy storage system is controlled based on the available quantity, the required quantity, and the sorted comprehensive capability parameters.

4. The method according to claim 3, wherein, The step of controlling the switching status of the sub-modules in the new energy storage system based on the available quantity, the demand quantity, and the sorted comprehensive capacity parameters includes: When the available quantity is less than the required quantity, control all sub-modules in the new energy storage system to be in a locked state; When the available quantity equals the required quantity, the available sub-modules in the new energy storage system are controlled to be in the activated state; When the available quantity is greater than the required quantity, the switching status of the sub-modules in the new energy storage system is controlled according to the sorted comprehensive capability parameters.

5. The method according to any one of claims 2 to 4, wherein, Based on the sorted comprehensive capability parameters, the switching status of the sub-modules in the new energy storage system is controlled, including: Determine the first difference between the largest and the smallest integrated capability parameter; Based on the first difference and the sorted comprehensive capability parameters, the switching status of the sub-modules in the new energy storage system is controlled.

6. The method according to claim 5, wherein, The step of controlling the switching status of the sub-modules in the new energy storage system based on the first difference and the sorted comprehensive capability parameters includes: If the first difference is greater than or equal to the target threshold, based on the comprehensive capability parameters sorted from largest to smallest, the sub-modules corresponding to the first N comprehensive capability parameters are controlled to be in an engaged state, and the remaining sub-modules corresponding to the comprehensive capability parameters are controlled to be in a cut-out state; where N is the required number of the sub-modules. If the first difference is less than the target threshold, the deployment status of M sub-modules is controlled according to the sorted comprehensive capability parameters; M is the difference between the required number of sub-modules and the number already deployed.

7. The method according to claim 6, wherein, The step of controlling the switching status of the M sub-modules based on the sorted comprehensive capability parameters includes: If M is greater than the target value, the sub-modules corresponding to the first M comprehensive capability parameters are controlled to be in the invested state according to the comprehensive capability parameters sorted from largest to smallest that have not been invested in the sub-modules. If M is less than or equal to the target value, the sub-modules corresponding to the first M comprehensive capability parameters are controlled to be in a cut-out state according to the comprehensive capability parameters that have been deployed in the sub-modules, sorted from smallest to largest.

8. The method according to any one of claims 1 to 7, wherein, The method further includes: The setting submodule includes battery capability parameters of at least one battery module in the setting submodule; the state of each submodule in the setting submodule is either cut-out state or locked state; Control the energy curtailment operation of the new energy power generation module in the first submodule; the first submodule is the submodule in which the battery capacity parameter is less than or equal to the target value; The new energy power generation module in the second submodule is controlled to charge the battery module in the second submodule; the second submodule is a submodule whose battery capacity parameter is greater than the target value.

9. A control method for a new energy storage system, the method comprising: Based on the obtained power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target sub-module, and the maximum charging parameters of the battery module in the target sub-module, the comprehensive capability parameters of the target sub-module are determined. The comprehensive capability parameters of the target submodule are sent to the valve control device; wherein, the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching status of the submodule in the new energy storage system.

10. The method according to claim 9, wherein, The power demand parameters include the demand current, the output power parameters include the output current, and the maximum charging parameters include the maximum charging current; the determination of the comprehensive capability parameters of the target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule includes: When the demand current of the power grid system represents the power absorption demand of the power grid system, a second difference between the output current of the new energy power generation module and the maximum charging current of the battery module is determined. If the demand current of the power grid system is less than the second difference, the comprehensive capability parameter of the target submodule is determined as the target value. If the demand current of the power grid system is greater than or equal to the second difference, the comprehensive capability parameters of the target submodule are determined based on the demand current of the power grid system and the output current of the new energy power generation module.

11. The method according to claim 10, wherein, The determination of the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the output current of the new energy power generation module includes: When the demand current of the power grid system is less than the output current of the new energy power generation module, the output capacity parameter of the new energy power generation module to the power grid system is determined based on the second difference and the theoretical maximum output current of the new energy power generation module. Based on the output capability parameters, the comprehensive capability parameters of the target submodule are determined.

12. The method according to claim 10 or 11, wherein, The determination of the comprehensive capability parameters of the target submodule based on the demand current of the power grid system and the output current of the new energy power generation module includes: When the demand current of the power grid system is greater than or equal to the output current of the new energy power generation module, the sum of the output current of the new energy power generation module and the obtained maximum discharge current of the battery module is determined as the total maximum output current of the target sub-module. If the demand current of the power grid system is greater than the total maximum output current of the target submodule, the comprehensive capability parameter of the target submodule is determined to be zero. When the demand current of the power grid system is less than or equal to the total maximum output current of the target submodule, the output capacity parameters are determined based on the output current of the new energy power generation module and the theoretical maximum output current of the new energy power generation module, and the comprehensive capacity parameters of the target submodule are determined based on the output capacity parameters.

13. The method according to any one of claims 9 to 12, wherein, The power demand parameters include the demand current, the output power parameters include the output current, and the maximum charging parameters include the maximum charging current; the determination of the comprehensive capability parameters of the target submodule based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target submodule, and the maximum charging parameters of the battery module in the target submodule includes: When the demand current of the power grid system represents the power demand of the power grid system, a third difference between the maximum charging current of the battery module and the output current of the new energy power generation module is determined. If the demand current of the power grid system is greater than the third difference, the comprehensive capability parameter of the target submodule is determined as the target value. If the demand current of the power grid system is less than or equal to the third difference, the battery capacity parameter of the battery module in the target submodule is determined as the comprehensive capacity parameter of the target submodule.

14. The method according to any one of claims 9 to 13, wherein, The method further includes: Obtain the battery state of charge and battery power capability parameters of the battery module in the target submodule; The battery state of charge and the battery power capability parameters are fused to obtain the battery capability parameters of the battery module in the target submodule; The battery capacity parameters of the battery module in the target submodule are sent to the valve control device; wherein, the battery capacity parameters of the battery module in the target submodule are used by the valve control device to control the power supply status of the new energy power generation module in the target submodule to the battery module in the target submodule.

15. An electronic device, the electronic device comprising: The acquisition module is used to acquire the comprehensive capability parameters of each of the at least two cascaded sub-modules in the new energy storage system. The comprehensive capability parameters of each submodule are determined based on the power demand parameters of the power grid system, the output power parameters of the new energy power generation modules included in each submodule, and the maximum charging parameters of the battery modules included in each submodule; wherein, each submodule is used to exchange electrical energy with the power grid system; The control module is used to control the switching status of the sub-modules in the new energy storage system based on at least two of the comprehensive capability parameters.

16. An electronic device, the electronic device comprising: The determination module is used to determine the comprehensive capability parameters of the target sub-module based on the acquired power demand parameters of the power grid system, the output power parameters of the new energy power generation module in the target sub-module, and the maximum charging parameters of the battery module in the target sub-module. A communication module is used to send the comprehensive capability parameters of the target submodule to the valve control device; wherein, the comprehensive capability parameters of the target submodule are used by the valve control device to control the switching status of the submodule in the new energy storage system.

17. A valve control device, comprising a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the method according to any one of claims 1 to 8.

18. A control device comprising a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the method according to any one of claims 9 to 14.

19. A control system comprising the valve control device of claim 17 and at least two control devices of claim 18; wherein the at least two control devices are connected to the valve control device; and the at least two control devices are connected one-to-one with at least two cascaded sub-modules.

20. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method of any one of claims 1 to 8 or any one of claims 9 to 14.

21. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the method of any one of claims 1 to 8 or any one of claims 9 to 14.

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