Energy storage system control method, device, system, equipment, medium and program product

Abstract

The invention relates to an energy storage system control method, device, system and equipment, a medium and a program product. The energy storage system comprises a plurality of energy storage sub-modules, and the method comprises the following steps: carrying out fault detection on the energy storage system, and determining a plurality of available energy storage sub-modules in the energy storage system according to a detection result; obtaining the single-day maximum frequency modulation mileage of the energy storage system, the rated voltage of a bus and the energy storage information of each available energy storage sub-module; and controlling the energy storage system according to the single-day maximum frequency modulation mileage, the bus rated voltage and the energy storage information of each available energy storage sub-module. According to the invention, the high-voltage direct-current direct-hanging energy storage system can be well controlled, and the utilization rate and reliability of the high-voltage direct-current direct-hanging energy storage system are improved.

Description

Technical Field

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

[0002] With the development of new energy technology, a variety of energy storage systems have emerged, including high-voltage direct hanging and low-voltage direct hanging. Among them, high-voltage direct hanging energy storage systems can also be divided into high-voltage AC direct hanging energy storage systems and high-voltage DC direct hanging energy storage systems.

[0003] At present, most control algorithms are designed for high-voltage AC direct-mounted energy storage systems, but the above control algorithms are not applicable to high-voltage DC direct-mounted energy storage systems. Therefore, how to control high-voltage DC direct-mounted energy storage systems has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] Based on the above problems, the present application provides an energy storage system control method, device, system, equipment, medium and program product, which can well control the high-voltage direct current energy storage system and improve the utilization and reliability of the high-voltage direct current energy storage system.

[0005] In a first aspect, the present application provides a method for controlling an energy storage system. The energy storage system includes multiple energy storage submodules, and the method includes: performing fault detection on the energy storage system, and determining multiple available energy storage submodules in the energy storage system according to the detection results; obtaining the energy storage system's maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule; and controlling the energy storage system according to the maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule.

[0006] In the technical solution of the embodiment of the present application, a dynamic redundant control strategy is implemented through fault detection, which can not only determine the operating limit of the energy storage system, thereby improving the utilization rate of the energy storage system; but also control the energy storage system according to the maximum frequency regulation mileage in a single day, thereby improving the reliability of the energy storage system.

[0007] In some embodiments, the energy storage information includes module voltage and current state of charge, and the energy storage system is controlled according to the maximum frequency regulation mileage per day, the bus rated voltage, and the energy storage information of each available energy storage submodule, including: determining the total available voltage according to the module voltage of each available energy storage submodule; when the total available voltage is greater than or equal to the bus rated voltage, controlling the energy storage system according to the maximum frequency regulation mileage per day and the current state of charge of each available energy storage submodule. In the technical solution of the embodiment of the present application, the control strategy of dynamic redundancy is realized through fault detection, which can not only determine the operating limit of the energy storage system, thereby improving the utilization rate of the energy storage system; but also, controlling the energy storage system according to the maximum frequency regulation mileage per day can also improve the reliability of the energy storage system.

[0008] In some embodiments, the energy storage system is controlled according to the maximum frequency modulation mileage in a single day and the current charge state of each available energy storage submodule, including: predicting the available frequency modulation time of the energy storage system according to the maximum frequency modulation mileage in a single day and the current charge state of each available energy storage submodule; and controlling the energy storage system to lock when the available frequency modulation time meets the preset conditions. In the technical solution of the embodiment of the present application, the available frequency modulation time is predicted, which can not only timely control the energy storage system to lock, thereby improving the reliability of the energy storage system; but also determine the subsequent operation and maintenance plan according to the available frequency modulation time, thereby providing a more flexible and accurate redundant operation strategy.

[0009] In some embodiments, the maximum frequency modulation mileage per day includes the maximum frequency modulation mileage per day for charging and the maximum frequency modulation mileage per day for discharging. According to the maximum frequency modulation mileage per day and the current state of charge of each available energy storage submodule, the available frequency modulation time of the energy storage system is predicted, including: according to the maximum frequency modulation mileage per day for charging and the current state of charge of each available energy storage submodule, the available charging frequency modulation time of the energy storage system is predicted; according to the maximum frequency modulation mileage per day for discharging and the current state of charge of each available energy storage submodule, the available discharge frequency modulation time of the energy storage system is predicted. In the technical solution of the embodiment of the present application, the available charging frequency modulation time and the available discharge frequency modulation time are predicted respectively, which can provide a basis for determining the charging operation and maintenance plan and the discharging operation and maintenance plan respectively, thereby improving the reliability of the energy storage system.

[0010] In some embodiments, the available charging and frequency modulation time of the energy storage system is predicted based on the maximum frequency modulation mileage of charging in a single day and the current charge state of each available energy storage submodule, including: determining the available charging and frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule; predicting the available charging and frequency modulation time of the energy storage system according to the available charging and frequency modulation mileage and the maximum charging and frequency modulation mileage in a single day. In the technical solution of the embodiment of the present application, the available charging and frequency modulation time is predicted based on the current charge state of each available energy storage submodule, which can reduce the risk of overcharging the energy storage submodule, and the prediction of the available charging and frequency modulation time can not only control the energy storage system in a timely manner, but also provide a basis for the subsequent determination of the charging operation and maintenance plan, thereby improving the reliability of the energy storage system.

[0011] In some embodiments, the available charging and frequency modulation mileage of the energy storage system is determined according to the current state of charge of each available energy storage submodule, including: determining the maximum current state of charge from the current states of charge of multiple available energy storage submodules; determining the maximum allowable state of charge from the allowable states of charge of multiple available energy storage submodules; determining the chargeable ratio according to the maximum current state of charge and the maximum allowable state of charge; determining the available charging and frequency modulation mileage of the energy storage system according to the chargeable ratio, the number of available energy storage submodules and the rated capacity. In the technical solution of the embodiment of the present application, the available charging and frequency modulation mileage is predicted according to the maximum current state of charge and the maximum allowable state of charge, which can reduce the risk of overcharging of the energy storage submodule and maximize the remaining charging and frequency modulation capacity of the energy storage system, thereby improving the charging performance of the energy storage system.

[0012] In some embodiments, the available discharge frequency modulation time of the energy storage system is predicted based on the maximum frequency modulation mileage of a single-day discharge and the current state of charge of each available energy storage submodule, including: determining the available discharge frequency modulation mileage of the energy storage system based on the current state of charge of each available energy storage submodule; predicting the available discharge frequency modulation time of the energy storage system based on the available discharge frequency modulation mileage and the maximum frequency modulation mileage of a single-day discharge. In the technical solution of the embodiment of the present application, the available discharge frequency modulation time is predicted based on the current state of charge of each available energy storage submodule, which can reduce the risk of over-discharge of the energy storage submodule, and the prediction of the available discharge frequency modulation time can not only control the energy storage system in a timely manner, but also provide a basis for the subsequent determination of the discharge operation and maintenance plan, thereby improving the reliability of the energy storage system.

[0013] In some embodiments, the available discharge and frequency regulation mileage of the energy storage system is determined according to the current state of charge of each available energy storage submodule, including: determining the minimum current state of charge from the current states of charge of multiple available energy storage submodules; determining the minimum operating voltage of each available energy storage submodule according to the rated voltage of the bus and the number of available energy storage submodules, and determining the minimum allowable state of charge according to the minimum operating voltage; determining the dischargeable ratio according to the minimum current state of charge and the minimum allowable state of charge; determining the available discharge and frequency regulation mileage of the energy storage system according to the dischargeable ratio, the number of available energy storage submodules and the rated capacity. The technical solution of the embodiment of the present application predicts the available discharge and frequency regulation mileage according to the minimum current state of charge and the minimum allowable state of charge, which can reduce the risk of over-discharge of the energy storage submodule and maximize the remaining discharge and frequency regulation capacity of the energy storage system, thereby improving the discharge performance of the energy storage system.

[0014] In some embodiments, when the available frequency modulation time meets the preset conditions, controlling the energy storage system to lock includes: when the available charging frequency modulation time and the available discharge frequency modulation time are both less than the preset time threshold, controlling the energy storage system to lock. In the technical solution of the embodiment of the present application, controlling the energy storage system according to the available charging frequency modulation time and the available discharge frequency modulation time can improve the reliability of the energy storage system.

[0015] In some embodiments, the method further includes: when the total available voltage is less than the rated voltage of the busbar, controlling the energy storage system to lock. In the technical solution of the embodiment of the present application, the dynamic redundancy control strategy is implemented through fault detection, and the operating limit of the energy storage system can be determined, thereby improving the utilization rate of the energy storage system.

[0016] In a second aspect, the present application also provides an energy storage system control device. The energy storage system includes a plurality of energy storage submodules, and the device includes:

[0017] A fault detection module is used to perform fault detection on the energy storage system and determine a plurality of available energy storage submodules in the energy storage system according to the detection results;

[0018] An information acquisition module is used to obtain the energy storage system's maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule;

[0019] The control module is used to control the energy storage system according to the maximum frequency regulation mileage in a single day, the rated voltage of the busbar and the energy storage information of each available energy storage sub-module.

[0020] In a third aspect, the present application further provides an energy storage system, the energy storage system comprising a plurality of energy storage submodules and a system controller;

[0021] The system controller is used to detect faults in the energy storage system and determine multiple available energy storage sub-modules in the energy storage system based on the detection results; obtain the energy storage system's maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage sub-module; and control the energy storage system based on the maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage sub-module.

[0022] In a fourth aspect, the present application further provides an electronic device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the method of the first aspect when executing the computer program.

[0023] In a fifth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which implements the method of the first aspect when the computer program is executed by a processor.

[0024] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which implements the method of the first aspect when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the optional embodiments below. The accompanying drawings are only used for the purpose of illustrating the optional embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1a A schematic diagram of the structure of an energy storage system according to an embodiment of the present application;

[0027] Figure 1b This is one of the structural schematic diagrams of the energy storage submodule according to one embodiment of the present application;

[0028] Figure 1c This is a second structural diagram of an energy storage submodule according to an embodiment of the present application;

[0029] Figure 2 It is a flowchart of an energy storage system control method according to an embodiment of the present application;

[0030] Figure 3 It is one of the flowcharts of the steps of controlling the energy storage system in one embodiment of the present application;

[0031] Figure 4 This is a second flow chart of the steps of controlling the energy storage system according to an embodiment of the present application;

[0032] Figure 5 It is a flowchart of the steps of predicting the available time of charging frequency modulation of the energy storage system according to one embodiment of the present application;

[0033] Figure 6 It is a flowchart of the steps of determining the available charging frequency modulation mileage of the energy storage system according to an embodiment of the present application;

[0034] Figure 7 It is a flowchart of the steps of predicting the available time of discharge frequency modulation of the energy storage system according to one embodiment of the present application;

[0035] Figure 8 It is a flowchart of the steps of determining the available discharge frequency modulation mileage of the energy storage system according to one embodiment of the present application;

[0036] Fig. 9 is a flow chart of an energy storage system control method according to another embodiment of the present application;

[0037] Fig.10 is a structural block diagram of an energy storage system control device according to an embodiment of the present application;

[0038] Fig.11 It is a schematic diagram of the internal structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0039] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0044] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] With the development of new energy technologies, a variety of energy storage systems have emerged, including high-voltage direct-hung and low-voltage direct-hung systems. Among them, high-voltage direct-hung energy storage systems can also be divided into high-voltage AC direct-hung energy storage systems and high-voltage DC direct-hung energy storage systems. At present, most control algorithms are mainly designed for high-voltage AC direct-hung energy storage systems, and the above control algorithms are not applicable to high-voltage DC direct-hung energy storage systems. Therefore, how to control high-voltage DC direct-hung energy storage systems has become a technical problem that needs to be solved urgently.

[0047] The embodiment of the present application provides a control scheme for a high-voltage direct current energy storage system, performs fault detection on the energy storage system, determines multiple available energy storage submodules in the energy storage system based on the detection results; obtains the energy storage system's maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule; and controls the energy storage system based on the maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule. The technical solution of the embodiment of the present application implements a dynamic redundant control strategy through fault detection, which can not only determine the operating limit of the energy storage system, thereby improving the utilization rate of the energy storage system; but also controls the energy storage system based on the maximum daily frequency regulation mileage, thereby improving the reliability of the energy storage system.

[0048] The energy storage system control method provided in the embodiment of the present application is applied to Figure 1a The application scenario includes a high-voltage direct current energy storage system, which includes a plurality of energy storage submodules 101 and a system controller. Each energy storage submodule 101 may include a module controller, and the system controller is connected to the module controller of each energy storage submodule 101 ( Figure 1a The system controller, module controller and connection relationship are not shown in the figure), wherein the module controller can be a main control board. The topological structure of the energy storage submodule 101 can adopt a half-bridge type or a full-bridge type.

[0049] like Figure 1bAs shown, the half-bridge energy storage submodule 101 may include a first switch tube S1, a second switch tube S2, a first switch K1, a first diode D1, a second diode D2, a capacitor C, a discharge resistor Rc and a battery module B. The control electrode of the first switch tube S1 is connected to the module controller, the first electrode of the first switch tube S1 is connected to the second electrode of the second switch tube S2, and the second electrode of the first switch tube S1 is connected to the first node J1; the control electrode of the second switch tube S2 is connected to the module controller, and the first electrode of the second switch tube S2 is connected to the second node J2; the anode of the first diode D1 is connected to the first electrode of the first switch tube S1, and the cathode of the first diode D1 is connected to the second electrode of the first switch tube S1; the anode of the second diode D2 is connected to the first electrode of the second switch tube S2, and the cathode of the second diode D2 is connected to the second electrode of the second switch tube S2; the first end of the first switch K1 is connected to the common end of the first switch tube S1 and the second switch tube S2, and the second end of the first switch K1 is connected to the second node J2. The first end of the capacitor C is connected to the first node J1, and the second end of the capacitor C is connected to the second node J2; the first end of the discharge resistor Rc is connected to the first node J1, and the second end of the discharge resistor Rc is connected to the second node J2. The positive electrode of the battery module B is connected to the first node J1, and the negative electrode of the battery module B is connected to the second node J2. The battery module B can be a single-branch series battery module, or a multi-branch series-parallel battery module.

[0050] When the first switch tube S1 , the second switch tube S2 , and the first switch K1 are all turned off, the energy storage submodule 101 is in a locked state.

[0051] Reference Figure 1cThe full-bridge energy storage submodule 101 may include a third switch tube S3, a fourth switch tube S4, a fifth switch tube S5, a sixth switch tube S6, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a second switch K2, a capacitor C, a discharge resistor Rc and a battery module B. The control electrode of the third switch tube S3 is connected to the module controller, the first electrode of the third switch tube S3 is connected to the second electrode of the fourth switch tube S4, and the second electrode of the third switch tube S3 is connected to the first node J1; the control electrode of the fourth switch tube S4 is connected to the module controller, the first electrode of the fourth switch tube S4 is connected to the second node J2; the control electrode of the fifth switch tube S5 is connected to the module controller, the first electrode of the fifth switch tube S5 is connected to the second electrode of the sixth switch tube S6, and the second electrode of the fifth switch tube S5 is connected to the first node J1; the control electrode of the sixth switch tube S6 is connected to the module control device, the first electrode of the sixth switch tube S6 is connected to the second node J2; the anode of the third diode D3 is connected to the first electrode of the third switch tube S3, and the The cathode of the third diode D3 is connected to the second electrode of the third switch tube S3; the anode of the fourth diode D4 is connected to the first electrode of the fourth switch tube S4, and the cathode of the fourth diode D4 is connected to the second electrode of the fourth switch tube S4; the anode of the fifth diode D5 is connected to the first electrode of the fifth switch tube S5, and the cathode of the fifth diode D5 is connected to the second electrode of the fifth switch tube S5; the anode of the sixth diode D6 is connected to the first electrode of the sixth switch tube S6, and the cathode of the sixth diode D6 is connected to the second electrode of the sixth switch tube S6; the first end of the second switch K2 is connected to the common end of the third switch tube S3 and the fourth switch tube S4, and the second end of the second switch K2 is connected to the common end of the fifth switch tube S5 and the sixth switch tube S6. The first end of the capacitor C is connected to the first node J1, and the second end of the capacitor C is connected to the second node J2; the first end of the discharge resistor Rc is connected to the first node J1, and the second end of the discharge resistor Rc is connected to the second node J2. The positive electrode of the battery module B is connected to the first node J1, and the negative electrode of the battery module B is connected to the second node J2. The battery module B may be a single-branch series-connected battery module or a multi-branch series-parallel-connected battery module.

[0052] When the third switch S3 , the fourth switch S4 , the fifth switch S5 and the sixth switch S6 are all turned off, the energy storage submodule is in a locked state.

[0053] According to some embodiments of the present application, referring to Figure 2 , a control method for an energy storage system is provided, which is described by taking the application of the method to the energy storage system in FIG. 1 as an example, and may include the following steps:

[0054] Step 201 : perform fault detection on the energy storage system, and determine a plurality of available energy storage submodules in the energy storage system according to the detection result.

[0055] In the energy storage system, each energy storage submodule includes a module controller, which can perform fault detection on the energy storage submodule to obtain a detection result, wherein the detection result indicates whether the energy storage submodule is faulty. If the energy storage submodule is faulty, the module controller can bypass the energy storage submodule.

[0056] After the module controller detects, it transmits the detection result to the system controller of the energy storage system. The system controller of the energy storage system can determine which energy storage submodules are available energy storage submodules according to the detection result.

[0057] For example, if the detection result shows that the energy storage submodule is faulty, the system controller may determine that the energy storage submodule is an unavailable energy storage submodule; if the detection result shows that the energy storage submodule is not faulty, the system controller may determine that the energy storage submodule is an available energy storage submodule.

[0058] In some embodiments, the number of available energy storage submodules in the energy storage system can be determined using formula (1):

[0059] N=Ntotal-Nflt--------------------------------(1)

[0060] Wherein, N is the number of available energy storage submodules, Ntotal is the total number of energy storage submodules in the energy storage system, and Nflt is the number of faulty energy storage submodules.

[0061] Step 202, obtaining the maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage submodule of the energy storage system.

[0062] Among them, the frequency modulation mileage can represent the change in power, the charging frequency modulation mileage represents the change in charging power, the discharging frequency modulation mileage represents the change in discharging power, and the maximum frequency modulation mileage in a single day represents the maximum change in power in a single day. The bus rated voltage is the rated voltage between the positive bus and the negative bus of the energy storage system, and the rated voltage can be pre-set in the system controller of the energy storage system. The energy storage information of the available energy storage submodule may include at least one of the module voltage, module current and current state of charge of the energy storage submodule. The state of charge (SOC) is the ratio of the remaining capacity of the battery to its capacity in a fully charged state.

[0063] During the operation of the energy storage system, the module controller of each energy storage submodule can record the frequency modulation mileage of the energy storage submodule every day and transmit the frequency modulation mileage of the energy storage submodule to the system controller. The system controller can update the maximum frequency modulation mileage of a single day in real time based on the records of the day and historical records.

[0064] For example, in the historical records, the maximum frequency regulation mileage per day is E1, and the system controller of the energy storage system obtains the frequency regulation mileage of the energy storage submodule as E2 from the module controller of the energy storage submodule, and E2 is greater than E1, then the maximum frequency regulation mileage per day is updated to E2.

[0065] The module controller of each energy storage submodule can also detect energy storage information such as module voltage, module current and current state of charge of the energy storage submodule, and transmit the energy storage information to the system controller. The system controller receives the energy storage information of the energy storage submodule transmitted by the module controller.

[0066] Step 203, controlling the energy storage system according to the maximum frequency regulation mileage in a single day, the rated voltage of the busbar and the energy storage information of each available energy storage submodule.

[0067] The system controller can determine whether the available energy storage submodules can support the operation of the energy storage system based on the module information of the available energy storage submodules and the rated voltage of the busbar; if the available energy storage submodules can support the operation of the energy storage system, the energy storage system can be controlled based on the maximum frequency regulation mileage per day, the chargeable power and dischargeable power of the energy storage system. If the available energy storage submodules cannot support the operation of the energy storage system, the energy storage system is controlled to be locked.

[0068] In the above embodiment, the energy storage system is subjected to fault detection, and multiple available energy storage submodules in the energy storage system are determined based on the detection results; the energy storage system's maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule are obtained; the energy storage system is controlled based on the maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule. The technical solution of the embodiment of the present application implements a dynamic redundant control strategy through fault detection, which can not only determine the operating limit of the energy storage system, thereby improving the utilization rate of the energy storage system; but also control the energy storage system based on the maximum daily frequency regulation mileage, thereby improving the reliability of the energy storage system.

[0069] According to some embodiments of the present application, referring to Figure 3 The energy storage information includes the module voltage and the current state of charge. The process of controlling the energy storage system according to the maximum frequency regulation mileage per day, the bus rated voltage and the energy storage information of each available energy storage submodule may include the following steps:

[0070] Step 301 : determining a total available voltage according to the module voltages of the available energy storage submodules.

[0071] The system controller of the energy storage system can obtain the module voltage of each available energy storage submodule, and sum the module voltages of multiple available energy storage submodules to obtain the total available voltage. As shown in formula (2):

[0072] Utotal=∑Usmeni--------------------------------(2)

[0073] Among them, Utotal is the total available voltage, and Usmeni is the module voltage of the i-th available energy storage submodule.

[0074] Step 302: When the total available voltage is greater than or equal to the rated voltage of the bus, the energy storage system is controlled according to the maximum frequency regulation mileage per day and the current charge state of each available energy storage submodule.

[0075] Compare the total available voltage with the rated voltage of the busbar. If the total available voltage is greater than or equal to the rated voltage of the busbar, it indicates that the currently available energy storage submodules can support the operation of the energy storage system. Then, determine whether the energy storage system can still be charged and whether the energy storage system can still be discharged based on the current state of charge of each available energy storage submodule and the maximum frequency regulation mileage per day. If it is determined that the energy storage system can still be charged, control the energy storage system to charge; if it is determined that the energy storage system can still be discharged, control the energy storage system to discharge; if it is determined that the energy storage system can neither be charged nor discharged, control the energy storage system to lock.

[0076] Step 303: When the total available voltage is less than the rated voltage of the bus, the energy storage system is controlled to be locked.

[0077] The total available voltage is compared with the bus rated voltage. If the total available voltage is less than the bus rated voltage, it indicates that the currently available energy storage submodules are insufficient to support the operation of the energy storage system, and the energy storage system is controlled to be locked.

[0078] In the above embodiment, the total available voltage is determined according to the module voltage of each available energy storage submodule; the total available voltage is determined according to the module voltage of each available energy storage submodule; when the total available voltage is less than the rated voltage of the busbar, the energy storage system is controlled to be locked. In the technical solution of the embodiment of the present application, the operating limit of the energy storage system is determined according to the available energy storage submodules, thereby improving the utilization rate of the energy storage system, and controlling the energy storage system according to the maximum frequency regulation mileage in a single day can not only improve the reliability of the energy storage system, but also maximize the remaining frequency regulation capacity of the energy storage system.

[0079] According to some embodiments of the present application, referring to Figure 4 The above process of controlling the energy storage system according to the maximum frequency regulation mileage per day and the current state of charge of each available energy storage submodule may include the following steps:

[0080] Step 3021: predict the available frequency regulation time of the energy storage system based on the maximum frequency regulation mileage in a single day and the current charge state of each available energy storage submodule.

[0081] Among them, the available frequency regulation time is the operating time of the energy storage system.

[0082] The system controller of the energy storage system can determine the total amount of electricity allowed to change in the energy storage system according to the current state of charge of each available energy storage submodule. Since the maximum frequency regulation mileage per day represents the maximum amount of electricity change per day, the operating time of the energy storage system can be predicted based on the maximum frequency regulation mileage per day and the total amount of electricity allowed to change in the energy storage system, and the frequency regulation available time of the energy storage system can be obtained.

[0083] For example, the maximum frequency regulation mileage in a single day is Emax, and the total amount of electricity allowed by the energy storage system is determined to be E' according to the current charge state of each available energy storage sub-module. Then the available frequency regulation time is the ratio of the total amount of electricity allowed by the energy storage system to the maximum frequency regulation mileage in a single day, that is, T = E' / Emax.

[0084] Step 3022: When the available frequency modulation time meets the preset conditions, the energy storage system is controlled to be locked.

[0085] After determining the available time for frequency modulation, the system controller of the energy storage system determines whether the available time for frequency modulation meets the preset conditions. If the available time for frequency modulation meets the preset conditions, it indicates that the energy storage system is difficult to continue to operate, and the energy storage system is controlled to be locked. If the available time for frequency modulation does not meet the preset conditions, it indicates that the energy storage system can continue to operate, and the energy storage system is controlled according to the actual situation.

[0086] The above-mentioned preset condition may include at least one of being less than a preset time threshold and being within a preset time range. In practical applications, the preset condition may be set according to actual conditions.

[0087] In some embodiments, the available frequency modulation time includes the available charging frequency modulation time and the available discharging frequency modulation time, the available charging frequency modulation time is the available operating time of the energy storage system in the charging state, and the available discharging frequency modulation time is the available operating time of the energy storage system in the discharging state. When the available charging frequency modulation time and the available discharging frequency modulation time are both less than the preset time threshold, the energy storage system is controlled to be locked.

[0088] For example, when the available duration of charging frequency modulation is t1 and the available duration of discharging frequency modulation is t2, and both t1 and t2 are less than the preset duration threshold T', it indicates that the operable duration of the energy storage system in the charging state and the operable duration in the discharging state are both short, and the energy storage system is controlled to be locked.

[0089] In some embodiments, when the available time for charging frequency modulation and the available time for discharging frequency modulation are both 0, the energy storage system is controlled to be locked.

[0090] In some embodiments, the operation and maintenance plan is determined according to the available time of charging frequency modulation and the available time of discharging frequency modulation. For example, the charging of the energy storage system is controlled according to the available time of charging frequency modulation, and the discharging of the energy storage system is controlled according to the available time of discharging frequency modulation. It should be noted that the operation and maintenance plan can be set according to actual conditions and is not limited to the above description.

[0091] Reference Figure 1b and Figure 1c In the topological structure of the energy storage system shown, the above step of controlling the energy storage system to be locked may be to input a control signal to the switch tubes in the energy storage submodule to control the switch tubes in the energy storage submodule to be turned off.

[0092] In the above embodiment, the available frequency modulation time of the energy storage system is predicted based on the maximum frequency modulation mileage in a single day and the current charge state of each available energy storage submodule; when the available frequency modulation time meets the preset conditions, the energy storage system is controlled to be locked. In the technical solution of the embodiment of the present application, the available frequency modulation time is predicted, which can not only timely control the energy storage system to be locked, thereby improving the reliability of the energy storage system; but also, the subsequent operation and maintenance plan can be determined according to the available frequency modulation time, thereby providing a more flexible and accurate redundant operation strategy.

[0093] According to some embodiments of the present application, the maximum frequency modulation mileage per day includes the maximum frequency modulation mileage per day for charging and the maximum frequency modulation mileage per day for discharging. The above-mentioned prediction of the available frequency modulation time of the energy storage system based on the maximum frequency modulation mileage per day and the current charge state of each available energy storage sub-module may include: predicting the available charging frequency modulation time of the energy storage system based on the maximum frequency modulation mileage per day for charging and the current charge state of each available energy storage sub-module; predicting the available discharge frequency modulation time of the energy storage system based on the maximum frequency modulation mileage per day for discharging and the current charge state of each available energy storage sub-module.

[0094] The system controller of the energy storage system can record the maximum frequency modulation mileage of a single day of charging and the maximum frequency modulation mileage of a single day of discharging respectively. Then, the system controller can determine the time it takes for the energy storage system to charge to the first state of charge with the maximum frequency modulation mileage of a single day of charging, and obtain the available time for charging and frequency modulation. Among them, the first state of charge is the state in which the energy storage submodule with the largest current state of charge is charged to full power.

[0095] For example, the maximum frequency modulation mileage per day of charging is Echmax, the current state of charge of the available energy storage submodule 1 is SOCsmen1, the current state of charge of the available energy storage submodule 2 is SOCsmen2..., where SOCsmen1 is the maximum current state of charge. The energy storage system is charged at the maximum frequency modulation mileage per day of charging Echmax, and the time it takes to fully charge the available energy storage submodule 1 is T1, then T1 is the available time for charging frequency modulation.

[0096] The system controller of the energy storage system can also determine the time it takes for the energy storage system to discharge to the second state of charge at the maximum frequency modulation mileage of a single day, and obtain the available time for discharge frequency modulation; wherein the second state of charge is the state in which the energy storage submodule with the smallest current state of charge is discharged to the lowest power.

[0097] For example, the maximum frequency modulation mileage per day of discharge is Edismax, the current state of charge of the available energy storage submodule 1 is SOCsmen1, the current state of charge of the available energy storage submodule 2 is SOCsmen2..., where SOCsmen2 is the minimum current state of charge. The energy storage system discharges at the maximum frequency modulation mileage per day of discharge Edismax, and the time it takes for the available energy storage submodule 2 to reach 0 is T2, then T2 is the available time for discharge frequency modulation.

[0098] In the above embodiment, the available charging frequency modulation time of the energy storage system is predicted based on the maximum frequency modulation mileage of charging per day and the current charge state of each available energy storage submodule; the available discharge frequency modulation time of the energy storage system is predicted based on the maximum frequency modulation mileage of discharging per day and the current charge state of each available energy storage submodule. In the technical solution of the embodiment of the present application, the available charging frequency modulation time and the available discharge frequency modulation time are predicted respectively, which can provide a basis for determining the charging operation and maintenance plan and the discharging operation and maintenance plan respectively, thereby improving the reliability of the energy storage system.

[0099] According to some embodiments of the present application, referring to Figure 5 The process of predicting the available charging frequency modulation time of the energy storage system based on the maximum frequency modulation mileage of a single charging day and the current charge state of each available energy storage submodule may include:

[0100] Step 401, determining the available charging frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule.

[0101] Among them, the available charging frequency modulation mileage can represent the total charging capacity allowed by the energy storage system.

[0102] The system controller of the energy storage system can determine the allowed charging capacity of each available energy storage submodule according to the current charge state of each available energy storage submodule, and determine the minimum allowed charging capacity from the allowed charging capacities of multiple energy storage submodules.

[0103] For example, the current state of charge of available energy storage submodule 1 is SOCsmen1, the current state of charge of available energy storage submodule 2 is SOCsmen2..., assuming that each energy storage submodule is allowed to be charged to a state of SOC 1, it can be determined that the allowed charging power of available energy storage submodule 1 is 1-SOCsmen1, the allowed charging power of available energy storage submodule 2 is 1-SOCsmen2.... Since the current state of charge SOCsmen1 of available energy storage submodule 1 is the largest, the allowed charging power 1-SOCsmen1 of available energy storage submodule 1 is the minimum allowed charging power.

[0104] Afterwards, the system controller of the energy storage system can determine the total charging power allowed by the energy storage system according to the minimum allowed charging power and the number of available energy storage submodules, that is, determine the available charging frequency modulation mileage of the energy storage system.

[0105] For example, the minimum allowed charging capacity is 1-SOCsmen1, the number of available energy storage submodules is N, and the rated capacity of the energy storage submodule is Esm, then the available charging frequency modulation mileage of the energy storage system is E 可用充电 =(1-SOCsmen1)*N*Esm.

[0106] Step 402 , predicting the available charging frequency regulation time of the energy storage system according to the available charging frequency regulation mileage and the maximum charging frequency regulation mileage in a single day.

[0107] The system controller of the energy storage system determines the ratio of the available charging frequency regulation mileage to the maximum charging frequency regulation mileage in a single day, and obtains the available charging frequency regulation time of the energy storage system.

[0108] The available time of charging frequency modulation can be determined by formula (3):

[0109] TCD=E 可用充电 / Echmax-------------------------------(3)

[0110] Among them, TCD is the available time of charging frequency modulation, E 可用充电 is the available charging mileage, and Echmax is the maximum charging mileage in a single day.

[0111] In the above embodiment, the available charging frequency modulation mileage of the energy storage system is determined according to the current charge state of each available energy storage submodule; and the available charging frequency modulation time of the energy storage system is predicted according to the available charging frequency modulation mileage and the maximum charging frequency modulation mileage in a single day. In the technical solution of the embodiment of the present application, the available charging frequency modulation time is predicted according to the current charge state of each available energy storage submodule, which can reduce the risk of overcharging the energy storage submodule, and the prediction of the available charging frequency modulation time can not only control the energy storage system in a timely manner, but also provide a basis for the subsequent determination of the charging operation and maintenance plan, thereby improving the reliability of the energy storage system.

[0112] According to some embodiments of the present application, referring to Figure 6 The process of determining the available charging frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule may include:

[0113] Step 4011: determine the maximum current state of charge from the current states of charge of multiple available energy storage submodules.

[0114] The system controller of the energy storage system obtains the current state of charge of each available energy storage submodule from the module controller of each available energy storage submodule; then, the current state of charge of multiple available energy storage submodules is sorted, and the maximum current state of charge is determined according to the sorting result.

[0115] For example, the current state of charge of available energy storage submodule 1 is SOCsmen1, the current state of charge of available energy storage submodule 2 is SOCsmen2..., and the current states of charge of multiple available energy storage submodules are sorted in order from large to small, and the maximum current state of charge can be determined to be Max(SOCsmeni), where i is the serial number of the energy storage submodule.

[0116] Step 4012: determine the maximum allowable state of charge from the allowable states of charge of multiple available energy storage submodules.

[0117] Among them, the allowable state of charge is an inherent property of the energy storage submodule. Under ideal conditions, the allowable state of charge of the energy storage submodule is 1. However, the allowable state of charge of the energy storage submodule may not reach 1 in actual applications. For example, the allowable state of charge of the energy storage submodule is 99%, or the allowable state of charge of the energy storage submodule is 95%. Therefore, there may be a situation where the allowable states of charge of multiple available energy storage submodules are inconsistent. In this case, the system controller of the energy storage system can sort the allowable states of charge of multiple available energy storage submodules and determine the maximum allowable state of charge based on the sorting results.

[0118] For example, the allowable state of charge of available energy storage submodule 1 is SOC1, the allowable state of charge of available energy storage submodule 2 is SOC2, and so on. The allowable states of charge of multiple available energy storage submodules are sorted in order from large to small, and the maximum allowable state of charge is determined to be SOCmax.

[0119] Step 4013, determining the chargeable ratio according to the maximum current state of charge and the maximum allowed state of charge.

[0120] The chargeable ratio is the ratio of the chargeable capacity to the full charge capacity.

[0121] After determining the maximum current state of charge and the maximum allowable state of charge, the system controller of the energy storage system may calculate the difference between the maximum allowable state of charge and the maximum current state of charge to obtain a chargeable ratio.

[0122] For example, the maximum allowable state of charge is SOCmax, the maximum current state of charge is Max(SOCsmeni), and the chargeable ratio is SOCmax-Max(SOCsmeni).

[0123] Step 4014, determining the available charging frequency modulation mileage of the energy storage system according to the chargeable ratio, the number of available energy storage submodules and the rated capacity.

[0124] The rechargeable ratio determined above can be used as the rechargeable ratio of each available energy storage submodule; according to the rechargeable ratio and rated capacity of each available energy storage submodule, the rechargeable power of each available energy storage submodule can be determined; and according to the rechargeable power of each available energy storage submodule and the number of available energy storage submodules, the total rechargeable power of the energy storage system can be determined, that is, the available charging frequency modulation mileage of the energy storage system can be obtained.

[0125] The available charging frequency modulation mileage can be determined using formula (4):

[0126] E 可用充电 =(SOCmax–Max(SOCsmeni))*N*Esm----------(4)

[0127] Among them, E 可用充电 is the available charging frequency modulation mileage, SOCmax is the maximum allowable state of charge, Max(SOCsmeni) is the maximum current state of charge, N is the number of available energy storage submodules, and Esm is the rated capacity of a single energy storage submodule.

[0128] Based on formula (3) and formula (4), the available time of charging frequency modulation can be determined using formula (5):

[0129] TCD=E 可用充电 / Echmax=(SOCmax–Max(SOCsmeni))*N*Esm / Echmax---(5)

[0130] Among them, TCD is the available time of charging frequency modulation, E 可用充电 is the available charging frequency modulation mileage, SOCmax is the maximum allowable state of charge, MAX(SOCsmeni) is the maximum current state of charge, N is the number of available energy storage submodules, and Esm is the rated capacity of a single energy storage submodule.

[0131] In the above embodiment, the maximum current state of charge is determined from the current states of charge of multiple available energy storage submodules; the maximum allowable state of charge is determined from the allowable states of charge of multiple available energy storage submodules; the chargeable ratio is determined according to the maximum current state of charge and the maximum allowable state of charge; the chargeable ratio is determined according to the maximum current state of charge and the maximum allowable state of charge. In the technical solution of the embodiment of the present application, the available charging frequency modulation mileage is predicted according to the maximum current state of charge and the maximum allowable state of charge, which can reduce the overcharging risk of the energy storage submodule and maximize the remaining charging frequency modulation capacity of the energy storage system, thereby improving the charging performance of the energy storage system.

[0132] According to some embodiments of the present application, referring to Figure 7 The process of predicting the available discharge frequency regulation time of the energy storage system based on the maximum frequency regulation mileage of a single-day discharge and the current charge state of each available energy storage submodule may include:

[0133] Step 501: Determine the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule.

[0134] Among them, the total discharge capacity allowed by the energy storage system can be represented by the discharge frequency modulation mileage.

[0135] The system controller of the energy storage system can determine the allowable discharge capacity of each available energy storage submodule according to the current charge state of each available energy storage submodule, and determine the minimum allowable discharge capacity from the allowable discharge capacities of multiple energy storage submodules.

[0136] For example, the current state of charge of available energy storage submodule 1 is SOCsmen1, the current state of charge of available energy storage submodule 2 is SOCsmen2..., assuming that each energy storage submodule is allowed to discharge to a state where the SOC is 0, it can be determined that the discharge amount allowed by available energy storage submodule 1 is SOCsmen1, and the discharge amount allowed by available energy storage submodule 2 is SOCsmen2... Since the current state of charge SOCsmen2 of available energy storage submodule 2 is the smallest, the discharge amount SOCsmen2 allowed by available energy storage submodule 2 is the minimum allowed discharge amount.

[0137] Afterwards, the system controller of the energy storage system can determine the available discharge frequency regulation mileage of the energy storage system according to the minimum allowable discharge power and the number of available energy storage submodules.

[0138] For example, the minimum allowable discharge capacity is SOCsmen2, the number of available energy storage submodules is N, and the rated capacity of the energy storage submodule is Esm, then the available discharge frequency modulation mileage of the energy storage system is E 可用放电 =SOCsmen2*N*Esm.

[0139] Step 502 , predicting the available discharge frequency regulation time of the energy storage system according to the available discharge frequency regulation mileage and the maximum discharge frequency regulation mileage per day.

[0140] The system controller of the energy storage system determines the ratio of the available discharge and frequency regulation mileage to the maximum discharge and frequency regulation mileage in a single day, and obtains the available discharge and frequency regulation time of the energy storage system.

[0141] The available time of discharge frequency modulation can be determined by formula (6):

[0142] TDD=E 可用放电 / Edismax-------------------------------(6)

[0143] Where TDD is the available time for discharge frequency modulation, E 可用放电 It is the available discharge and frequency modulation mileage, and Edismax is the maximum discharge and frequency modulation mileage in a single day.

[0144] In the above embodiment, the available discharge frequency modulation mileage of the energy storage system is determined according to the current charge state of each available energy storage submodule; and the available discharge frequency modulation time of the energy storage system is predicted according to the available discharge frequency modulation mileage and the maximum frequency modulation mileage of discharge in a single day. In the technical solution of the embodiment of the present application, the available discharge frequency modulation time is predicted according to the current charge state of each available energy storage submodule, which can reduce the risk of over-discharge of the energy storage submodule, and the prediction of the available discharge frequency modulation time can not only control the energy storage system in time, but also provide a basis for the subsequent determination of the discharge operation and maintenance plan, thereby improving the reliability of the energy storage system.

[0145] According to some embodiments of the present application, referring to Figure 8 The process of determining the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule may include:

[0146] Step 5011: determine the minimum current state of charge from the current states of charge of multiple available energy storage submodules.

[0147] The system controller of the energy storage system obtains the current state of charge of each available energy storage submodule from the module controller of each available energy storage submodule; then, the current state of charge of multiple available energy storage submodules is sorted, and the minimum current state of charge is determined according to the sorting result.

[0148] For example, the current state of charge of available energy storage submodule 1 is SOCsmen1, the current state of charge of available energy storage submodule 2 is SOCsmen2..., the current states of charge of multiple available energy storage submodules are sorted in ascending order, and the minimum current state of charge is determined according to the sorting result as Min(SOCsmeni), where i is the serial number of the energy storage submodule.

[0149] Step 5012: Determine the minimum operating voltage of each available energy storage submodule according to the bus rated voltage and the number of available energy storage submodules, and determine the minimum allowable state of charge according to the minimum operating voltage.

[0150] The system controller of the energy storage system calculates the ratio of the bus rated voltage to the number of available energy storage submodules to obtain the minimum operating voltage of the available energy storage submodules. As shown in formula (7):

[0151] Usmmin=Ubus / N---------------------------------(7)

[0152] Among them, Usmmin is the minimum operating voltage, Ubus is the bus rated voltage, and N is the number of available energy storage submodules.

[0153] After the minimum operating voltage is determined, the minimum allowable state of charge corresponding to the minimum operating voltage is found from the pre-established OCV-SOC curve. For example, the minimum allowable state of charge SOCmin corresponding to the minimum operating voltage Usmmin is found from the OCV-SOC curve.

[0154] The above OCV-SOC curve is established based on battery test data.

[0155] Step 5013, determining the dischargeable ratio according to the minimum current state of charge and the minimum allowed state of charge.

[0156] The dischargeable ratio is the ratio of the dischargeable capacity to the fully charged capacity.

[0157] After determining the minimum current state of charge and the minimum allowable state of charge, the system controller of the energy storage system may calculate the difference between the minimum current state of charge and the minimum allowable state of charge to obtain the dischargeable ratio.

[0158] For example, the minimum current state of charge is Min (SOCsmeni), the minimum allowed state of charge is SOCmin, and the dischargeable ratio is Min (SOCsmeni) - SOCmin.

[0159] Step 5014, determining the available discharge frequency modulation mileage of the energy storage system according to the dischargeable ratio, the number of available energy storage submodules and the rated capacity.

[0160] The above-determined dischargeable ratio can be used as the dischargeable ratio of each available energy storage submodule; according to the dischargeable ratio and rated capacity of each available energy storage submodule, the dischargeable power of each available energy storage submodule can be determined; and according to the dischargeable power of each available energy storage submodule and the number of available energy storage submodules, the total dischargeable power of the energy storage system can be determined, that is, the available discharge frequency modulation mileage of the energy storage system can be determined.

[0161] The available discharge frequency modulation mileage can be determined using formula (8):

[0162] E 可用放电 =(Min(SOCsmeni)-SOCmin)*N*Esm----------(8)

[0163] Among them, E 可用放电 is the available discharge frequency modulation mileage, SOCmin is the minimum allowable state of charge, Min(SOCsmeni) is the minimum current state of charge, N is the number of available energy storage sub-modules, and Esm is the rated capacity of a single energy storage sub-module.

[0164] Based on formula (6) and formula (8), the available time of discharge frequency modulation can be determined by formula (9):

[0165] TDD=E 可用放电 / Edismax=(Min(SOCsmeni)-SOCmin)*N*Esm- / Edismax(5)

[0166] Where TDD is the available time for discharge frequency modulation, E 可用放电 is the available discharge frequency modulation mileage, SOCmin is the minimum allowable state of charge, Min(SOCsmeni) is the minimum current state of charge, N is the number of available energy storage sub-modules, and Esm is the rated capacity of a single energy storage sub-module.

[0167] In the above embodiment, the minimum current state of charge is determined from the current states of charge of multiple available energy storage submodules; the minimum operating voltage of each available energy storage submodule is determined according to the rated voltage of the bus and the number of available energy storage submodules, and the minimum allowable state of charge is determined according to the minimum operating voltage; the dischargeable ratio is determined according to the minimum current state of charge and the minimum allowable state of charge; the available discharge frequency regulation mileage of the energy storage system is determined according to the dischargeable ratio, the number of available energy storage submodules and the rated capacity. In the technical solution of the embodiment of the present application, the available discharge frequency regulation mileage is predicted based on the minimum current state of charge and the minimum allowable state of charge, which can reduce the risk of over-discharge of the energy storage submodule and maximize the remaining discharge frequency regulation capacity of the energy storage system, thereby improving the discharge performance of the energy storage system.

[0168] According to some embodiments of the present application, referring to Fig. 9 , a control method for an energy storage system is provided, which is described by taking the application of the method to the energy storage system in FIG. 1 as an example, and may include the following steps:

[0169] Step 601 : perform fault detection on the energy storage system, and determine a plurality of available energy storage submodules in the energy storage system according to the detection result.

[0170] Step 602, obtaining the maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage submodule of the energy storage system.

[0171] Among them, the energy storage information includes module voltage and current state of charge.

[0172] Step 603: Determine the total available voltage according to the module voltage of each available energy storage submodule.

[0173] Step 604: When the total available voltage is less than the rated voltage of the bus, control the energy storage system to be locked.

[0174] Step 605, when the total available voltage is greater than or equal to the rated voltage of the bus, determine the available charging and frequency regulation mileage of the energy storage system according to the current charge state of each available energy storage submodule; and predict the available charging and frequency regulation time of the energy storage system according to the available charging and frequency regulation mileage and the maximum charging and frequency regulation mileage in a single day.

[0175] In some embodiments, a maximum current state of charge is determined from the current states of charge of multiple available energy storage submodules; a maximum allowable state of charge is determined from the allowable states of charge of multiple available energy storage submodules; a chargeable ratio is determined based on the maximum current state of charge and the maximum allowable state of charge; and an available charging frequency modulation mileage of the energy storage system is determined based on the chargeable ratio, the number of available energy storage submodules, and the rated capacity.

[0176] Step 606, determining the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule; and predicting the available discharge frequency modulation time of the energy storage system according to the available discharge frequency modulation mileage and the maximum frequency modulation mileage of a single day of discharge.

[0177] In some embodiments, the minimum current state of charge is determined from the current states of charge of multiple available energy storage sub-modules; the minimum operating voltage of each available energy storage sub-module is determined based on the bus rated voltage and the number of available energy storage sub-modules, and the minimum allowable state of charge is determined based on the minimum operating voltage; the dischargeable ratio is determined based on the minimum current state of charge and the minimum allowable state of charge; and the available discharge frequency modulation mileage of the energy storage system is determined based on the dischargeable ratio, the number of available energy storage sub-modules and the rated capacity.

[0178] Step 607: When both the available duration of charging frequency modulation and the available duration of discharging frequency modulation are less than the preset duration threshold, the energy storage system is controlled to be locked.

[0179] In the above embodiment, a redundant operation control strategy is adopted to perform fault detection on the energy storage system, and multiple available energy storage sub-modules in the energy storage system are determined based on the detection results; the maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage sub-module of the energy storage system are obtained. Afterwards, the total available voltage is determined based on the module voltage of each available energy storage sub-module; the operating limit of the energy storage system can be determined based on the total available voltage and the bus rated voltage, thereby improving the utilization rate of the energy storage system. Based on the available charging frequency regulation mileage and the maximum daily charging frequency regulation mileage, the available charging frequency regulation time of the energy storage system is predicted; based on the available discharging frequency regulation mileage and the maximum daily discharge frequency regulation mileage, the available discharging frequency regulation time of the energy storage system is predicted, so that the energy storage system can be controlled in time, thereby improving the reliability of the energy storage system.

[0180] It should be understood that, although the various steps in the above flowchart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear description in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above flowchart may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0181] Based on the same inventive concept, the embodiment of the present application also provides an energy storage system control device for implementing the energy storage system control method involved above. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above method, so the specific limitations in one or more energy storage system control device embodiments provided below can refer to the limitations of the energy storage system control method above, and will not be repeated here.

[0182] According to some embodiments of the present application, referring to Fig.10 , provides an energy storage system control device, the device comprising:

[0183] A fault detection module 701 is used to perform fault detection on the energy storage system and determine a plurality of available energy storage submodules in the energy storage system according to the detection result;

[0184] The information acquisition module 702 is used to obtain the energy storage system's maximum daily frequency regulation mileage, bus rated voltage, and energy storage information of each available energy storage submodule;

[0185] The control module 703 is used to control the energy storage system according to the maximum frequency regulation mileage in a single day, the rated voltage of the bus and the energy storage information of each available energy storage submodule.

[0186] In some embodiments, the energy storage information includes module voltage and current state of charge. The control module 703 is specifically used to determine the total available voltage based on the module voltage of each available energy storage sub-module; when the total available voltage is greater than or equal to the rated voltage of the bus, the energy storage system is controlled based on the maximum daily frequency regulation mileage and the current state of charge of each available energy storage sub-module.

[0187] In some embodiments, the control module 703 is specifically used to predict the available frequency regulation time of the energy storage system based on the maximum frequency regulation mileage in a single day and the current charge state of each available energy storage sub-module; when the available frequency regulation time meets the preset conditions, control the energy storage system to lock.

[0188] In some embodiments, the maximum frequency modulation mileage per day includes the maximum frequency modulation mileage per day for charging and the maximum frequency modulation mileage per day for discharging. The control module 703 is specifically used to predict the available charging frequency modulation time of the energy storage system according to the maximum frequency modulation mileage per day for charging and the current charge state of each available energy storage sub-module; and predict the available discharging frequency modulation time of the energy storage system according to the maximum frequency modulation mileage per day for discharging and the current charge state of each available energy storage sub-module.

[0189] In some embodiments, the control module 703 is specifically used to determine the available charging and frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage sub-module; and predict the available charging and frequency modulation time of the energy storage system according to the available charging and frequency modulation mileage and the maximum charging and frequency modulation mileage in a single day.

[0190] In some embodiments, the control module 703 is specifically used to determine the maximum current state of charge from the current states of charge of multiple available energy storage sub-modules; determine the maximum allowable state of charge from the allowable states of charge of multiple available energy storage sub-modules; determine the chargeable ratio according to the maximum current state of charge and the maximum allowable state of charge; and determine the available charging frequency modulation mileage of the energy storage system according to the chargeable ratio, the number of available energy storage sub-modules and the rated capacity.

[0191] In some embodiments, the control module 703 is specifically used to determine the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule; and predict the available discharge frequency modulation time of the energy storage system according to the available discharge frequency modulation mileage and the maximum frequency modulation mileage of discharge in a single day.

[0192] In some embodiments, the control module 703 is specifically used to determine the minimum current state of charge from the current states of charge of multiple available energy storage sub-modules; determine the minimum operating voltage of each available energy storage sub-module according to the bus rated voltage and the number of available energy storage sub-modules, and determine the minimum allowable state of charge according to the minimum operating voltage; determine the dischargeable ratio according to the minimum current state of charge and the minimum allowable state of charge; determine the available discharge frequency modulation mileage of the energy storage system according to the dischargeable ratio, the number and rated capacity of the available energy storage sub-modules.

[0193] In some embodiments, the control module 703 is specifically configured to control the energy storage system to lock when both the available charging frequency modulation time and the available discharging frequency modulation time are less than a preset time threshold.

[0194] In some embodiments, the control module 703 is used to control the energy storage system to be locked when the total available voltage is less than the rated voltage of the bus.

[0195] Each module in the above energy storage system control device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in an electronic device in the form of hardware, or can be stored in a memory in an electronic device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0196] According to some embodiments of the present application, there is provided an energy storage system, the energy storage system comprising a plurality of energy storage submodules and a system controller;

[0197] The system controller is used to perform fault detection on the energy storage system, determine multiple available energy storage sub-modules in the energy storage system according to the detection results; obtain the energy storage system's maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage sub-module; and control the energy storage system according to the maximum daily frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage sub-module.

[0198] In some embodiments, the energy storage information includes module voltage and current state of charge, and the system controller is used to determine the total available voltage based on the module voltage of each available energy storage sub-module; when the total available voltage is greater than or equal to the rated voltage of the bus, the energy storage system is controlled based on the maximum daily frequency regulation mileage and the current state of charge of each available energy storage sub-module.

[0199] In some embodiments, the system controller is used to predict the available frequency regulation time of the energy storage system based on the maximum frequency regulation mileage in a single day and the current charge state of each available energy storage sub-module; when the available frequency regulation time meets the preset conditions, the energy storage system is controlled to be locked.

[0200] In some embodiments, the maximum frequency modulation mileage per day includes the maximum frequency modulation mileage per day for charging and the maximum frequency modulation mileage per day for discharging. The system controller is used to predict the available charging frequency modulation time of the energy storage system based on the maximum frequency modulation mileage per day for charging and the current charge state of each available energy storage sub-module; and predict the available discharging frequency modulation time of the energy storage system based on the maximum frequency modulation mileage per day for discharging and the current charge state of each available energy storage sub-module.

[0201] In some embodiments, the system controller is used to determine the available charging and frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule; and predict the available charging and frequency modulation time of the energy storage system according to the available charging and frequency modulation mileage and the maximum charging and frequency modulation mileage in a single day.

[0202] In some embodiments, the system controller is used to determine the maximum current state of charge from the current states of charge of multiple available energy storage sub-modules; determine the maximum allowable state of charge from the allowable states of charge of multiple available energy storage sub-modules; determine the chargeable ratio based on the maximum current state of charge and the maximum allowable state of charge; and determine the available charging frequency modulation mileage of the energy storage system based on the chargeable ratio, the number of available energy storage sub-modules and the rated capacity.

[0203] In some embodiments, the system controller is used to determine the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each available energy storage submodule; and predict the available discharge frequency modulation time of the energy storage system according to the available discharge frequency modulation mileage and the maximum frequency modulation mileage of a single day of discharge.

[0204] In some embodiments, the system controller is used to determine the minimum current state of charge from the current states of charge of multiple available energy storage sub-modules; determine the minimum operating voltage of each available energy storage sub-module based on the bus rated voltage and the number of available energy storage sub-modules, and determine the minimum allowable state of charge based on the minimum operating voltage; determine the dischargeable ratio based on the minimum current state of charge and the minimum allowable state of charge; determine the available discharge frequency modulation mileage of the energy storage system based on the dischargeable ratio, the number and rated capacity of the available energy storage sub-modules.

[0205] In some embodiments, the system controller is used to control the energy storage system to lock when the available charging frequency modulation time and the available discharging frequency modulation time are both less than a preset time threshold.

[0206] In some embodiments, the system controller is configured to control the energy storage system to be locked when the total available voltage is less than the rated voltage of the bus.

[0207] According to some embodiments of the present application, an electronic device is provided, which may be a system controller of an energy storage system. The internal structure diagram of the electronic device may be as follows: Fig.11 As shown. The electronic device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program, wherein the computer program can be used to implement the above-mentioned functions such as inputting data, performing calculations, and outputting results. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the electronic device is used to exchange information between the processor and an external device. The communication interface of the electronic device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for controlling an energy storage system is implemented.

[0208] Those skilled in the art will understand that Fig.11 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0209] According to some embodiments of the present application, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory including instructions, and the instructions can be executed by a processor of an electronic device to complete the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0210] According to some embodiments of the present application, a computer program product is also provided, and when the computer program is executed by a processor, the above method can be implemented. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, part or all of the above method can be implemented in whole or in part according to the process or function described in the embodiment of the present application.

[0211] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 specification.

[0212] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solutions of the present application in detail, but cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the protection scope of the attached claims described in the present application. Therefore, the protection scope of the patent of this application shall be based on the contents of the attached claims, and the description and drawings can be used to explain the contents of the claims.

Claims

1. A method for controlling an energy storage system, characterized in that: The energy storage system includes a plurality of energy storage submodules, and the method includes: Performing fault detection on the energy storage system, and determining a plurality of available energy storage submodules in the energy storage system according to the detection result; Obtaining the single-day maximum frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage submodule of the energy storage system; The energy storage system is controlled according to the single-day maximum frequency regulation mileage, the bus rated voltage and the energy storage information of each of the available energy storage submodules.

2. The method according to claim 1, characterized in that The energy storage information includes module voltage and current state of charge, and the energy storage system is controlled according to the maximum frequency regulation mileage per day, the bus rated voltage and the energy storage information of each available energy storage submodule, including: Determining a total available voltage according to the module voltages of the available energy storage submodules; When the total available voltage is greater than or equal to the bus rated voltage, the energy storage system is controlled according to the single-day maximum frequency regulation mileage and the current charge state of each of the available energy storage sub-modules.

3. The method according to claim 2, characterized in that The controlling the energy storage system according to the single-day maximum frequency modulation mileage and the current charge state of each of the available energy storage submodules includes: Predicting the available frequency regulation time of the energy storage system according to the maximum frequency regulation mileage in a single day and the current charge state of each of the available energy storage submodules; When the available frequency modulation time meets a preset condition, the energy storage system is controlled to be locked.

4. The method according to claim 3, characterized in that The maximum frequency modulation mileage per day includes the maximum frequency modulation mileage per day of charging and the maximum frequency modulation mileage per day of discharging. The frequency modulation available time of the energy storage system is predicted based on the maximum frequency modulation mileage per day and the current charge state of each of the available energy storage submodules, including: Predicting the available charging frequency modulation time of the energy storage system according to the maximum frequency modulation mileage of the charging day and the current charge state of each of the available energy storage submodules; The available discharge frequency regulation time of the energy storage system is predicted according to the maximum frequency regulation mileage of the discharge in a single day and the current charge state of each of the available energy storage submodules.

5. The method according to claim 4, characterized in that The predicting of the available charging frequency modulation time of the energy storage system according to the maximum frequency modulation mileage of the charging day and the current charge state of each of the available energy storage submodules includes: Determining the available charging frequency modulation mileage of the energy storage system according to the current charge state of each of the available energy storage submodules; The available charging frequency regulation time of the energy storage system is predicted according to the available charging frequency regulation mileage and the maximum charging frequency regulation mileage in a single day.

6. The method according to claim 5, characterized in that The step of determining the available charging frequency modulation mileage of the energy storage system according to the current charge state of each of the available energy storage submodules includes: Determining a maximum current state of charge from the current states of charge of the plurality of available energy storage submodules; Determining a maximum allowable state of charge from the allowable states of charge of the plurality of available energy storage submodules; Determining a chargeable ratio according to the maximum current state of charge and the maximum allowable state of charge; The available charging frequency modulation mileage of the energy storage system is determined according to the chargeable ratio, the number and rated capacity of the available energy storage submodules.

7. The method according to claim 4, characterized in that The predicting of the available discharge frequency modulation time of the energy storage system according to the maximum frequency modulation mileage of the discharge in a single day and the current charge state of each of the available energy storage submodules includes: Determining the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each of the available energy storage submodules; The available discharge frequency regulation time of the energy storage system is predicted based on the available discharge frequency regulation mileage and the maximum discharge frequency regulation mileage in a single day.

8. The method according to claim 7, characterized in that The step of determining the available discharge frequency modulation mileage of the energy storage system according to the current charge state of each of the available energy storage submodules includes: Determining a minimum current state of charge from the current states of charge of the plurality of available energy storage submodules; Determine the minimum operating voltage of each of the available energy storage submodules according to the bus rated voltage and the number of the available energy storage submodules, and determine the minimum allowable state of charge according to the minimum operating voltage; Determining a dischargeable ratio according to the minimum current state of charge and the minimum allowable state of charge; The available discharge frequency modulation mileage of the energy storage system is determined according to the dischargeable ratio, the number and rated capacity of the available energy storage submodules.

9. The method according to any one of claims 4 to 8, characterized in that: When the available frequency modulation time meets a preset condition, controlling the energy storage system to lock includes: When the available time for charging frequency modulation and the available time for discharging frequency modulation are both less than a preset time threshold, the energy storage system is controlled to be locked.

10. The method according to claim 2, characterized in that The method further comprises: When the total available voltage is less than the rated voltage of the bus, the energy storage system is controlled to be locked.

11. An energy storage system control device, characterized in that: The energy storage system includes a plurality of energy storage submodules, and the device includes: A fault detection module, used to perform fault detection on the energy storage system and determine a plurality of available energy storage submodules in the energy storage system according to the detection result; An information acquisition module, used to obtain the single-day maximum frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage submodule of the energy storage system; A control module is used to control the energy storage system according to the maximum frequency regulation mileage per day, the rated voltage of the bus and the energy storage information of each available energy storage submodule.

12. An energy storage system, characterized in that: The energy storage system includes a plurality of energy storage submodules and a system controller; The system controller is used to perform fault detection on the energy storage system and determine multiple available energy storage sub-modules in the energy storage system based on the detection results; obtain the single-day maximum frequency regulation mileage, bus rated voltage and energy storage information of each available energy storage sub-module of the energy storage system; and control the energy storage system based on the single-day maximum frequency regulation mileage, the bus rated voltage and the energy storage information of each available energy storage sub-module.

13. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 10 is implemented.

14. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

15. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 10 is implemented.

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