Control method and device, energy storage system, computer device and chip

Abstract

The application provides a control method and device, an energy storage system, a computer device, and a chip. The method comprises the following steps: in the case that a plurality of PCS energy storage converters are off-grid and parallelly operated, and the number of target PCS energy storage converters in which suspected electric arcs occur is greater than 1, switching the power supply for a load from the PCS energy storage converter to a first power source; controlling the target PCS energy storage converter to perform an arc extinguishing action; and after the target PCS energy storage converter finishes the arc extinguishing action, switching the power supply for the load from the first power source to the PCS energy storage converter. The application improves the problem that the power is greatly reduced due to the electric arc caused by the plurality of PCSs, and the load is unstable, and guarantees the normal operation of the load.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, and in particular to control methods and devices, energy storage systems, computer equipment, and chips. Background Technology

[0002] An electric arc is a gas discharge phenomenon. In energy storage systems, once a faulty electric arc occurs, if effective protective measures are not taken, the high temperature generated by the continuous DC arc can easily cause a fire, leading to the explosion of the battery pack and PCS energy storage converter, resulting in a major safety accident. In relevant arc detection technologies, after detecting a suspected arc, it is necessary to use the secondary judgment logic of the whole machine to determine whether it is a true or false arc.

[0003] When multiple PCS energy storage converters are connected in parallel off-grid, if a single PCS energy storage converter reports arcing, the power will decrease for a short period. Other PCS energy storage converters have short-term overload capacity, so it will not affect the normal operation of the load. However, if multiple PCS energy storage converters report arcing at the same time and execute arc extinguishing actions such as wave blocking, it will cause a large-scale power reduction, leading to load shedding. Summary of the Invention

[0004] The purpose of this application is to provide control methods and devices, energy storage systems, computer equipment, and chips to improve the situation where multiple PCSs report arcing in the off-grid state of energy storage, leading to unstable load operation.

[0005] The objective of this application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a control method applied to an energy storage system, the energy storage system including multiple PCS energy storage converters, the method comprising: when the number of target PCS energy storage converters operating off-grid in parallel and suspected of arcing is greater than one, switching the power supply for the load from the PCS energy storage converter to a first power supply; controlling the target PCS energy storage converter to perform an arc extinguishing action; and after the target PCS energy storage converter finishes its arc extinguishing action, switching the power supply for the load from the first power supply to the PCS energy storage converter.

[0007] In some embodiments, after switching the power supply for the load from the first power supply to the PCS energy storage converter, the method further includes: determining that a real arc has occurred in the energy storage system if the DC current of at least one target PCS energy storage converter is less than a target current threshold; or determining that no real arc has occurred in the energy storage system if the DC current of all target PCS energy storage converters is not less than the target current threshold.

[0008] In some embodiments, before switching the power supply for the load from the PCS energy storage converter to a first power supply, the method further includes: processing the corresponding arc characteristic signal of the PCS energy storage converter using an arc detection model to detect whether a suspected arc has occurred in the PCS energy storage converter.

[0009] In some embodiments, controlling the target PCS energy storage converter to perform arc extinguishing action includes: controlling the target PCS energy storage converter to perform wave blocking action; or, setting the power of the target PCS energy storage converter to 0.

[0010] In some embodiments, the method further includes: in the event of a real electric arc, controlling the plurality of PCS energy storage converters to stop operating, and generating arc fault information and sending it to the target device.

[0011] Secondly, this application provides a control module, which includes a switching control unit and an arc extinguishing control unit. The switching control unit is used to switch the power supply for the load from the PCS energy storage converter to a first power supply when multiple PCS energy storage converters are operating off-grid in parallel and the number of target PCS energy storage converters with suspected arcing is greater than one. The arc extinguishing control unit is used to control the target PCS energy storage converter to perform arc extinguishing action. The switching control unit is also used to switch the power supply for the load from the first power supply to the PCS energy storage converter after the target PCS energy storage converter finishes its arc extinguishing action.

[0012] In some embodiments, the control module further includes a judgment unit; the judgment unit is used to determine that a real arc has occurred when the DC current of at least one target PCS energy storage converter is less than the target current threshold; or, when the DC current of all target PCS energy storage converters is not less than the target current threshold, it is determined that no real arc has occurred.

[0013] In some embodiments, the control module further stores an arc detection model, which is used to process the corresponding arc characteristic signals of the PCS energy storage converter to detect whether a suspected arc has occurred in the PCS energy storage converter.

[0014] Thirdly, this application provides a PCS energy storage converter, which includes any of the control modules mentioned above.

[0015] Fourthly, this application provides an energy storage system, which includes multiple PCS energy storage converters and any of the aforementioned control modules.

[0016] In some embodiments, the energy storage system further includes a switching switch; the switching switch is used to switch the power supply to the load.

[0017] In some embodiments, at least a portion of the control module is disposed inside the PCS energy storage converter; or, at least a portion of the control module is disposed outside the PCS energy storage converter.

[0018] In some embodiments, the energy storage system further includes a first power source, which includes a power consumption side and / or a backup power source.

[0019] In some embodiments, the power supply side includes an AC side and / or a DC side.

[0020] In some embodiments, the backup power supply is a microgrid system including a generator, a UPS uninterruptible power supply, and a PCS energy storage converter; or, the backup power supply is a microgrid system including an inverter; or, the backup power supply is a microgrid system including a PCS energy storage converter and an inverter.

[0021] Fifthly, this application provides a computer device, the computer device including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement any of the methods described above.

[0022] Sixthly, this application provides a chip for performing any of the above methods.

[0023] This application provides a control method and apparatus, an energy storage system, computer equipment, and a chip. The method includes: when multiple PCS energy storage converters are operating off-grid in parallel and the number of target PCS energy storage converters experiencing suspected arcing is greater than one, switching the power supply to the load from one PCS energy storage converter to a first power supply; controlling the target PCS energy storage converter to perform arc extinguishing action; and after the target PCS energy storage converter completes its arc extinguishing action, switching the power supply to the load back from the first power supply to the PCS energy storage converter. This application improves the problem of significant power reduction and load instability caused by multiple PCS arcing incidents by switching the first power supply to the load, thus ensuring the normal operation of the load. Attached Figure Description

[0024] This application will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a flowchart illustrating a control method provided in an embodiment of this application.

[0026] Figure 2 This is a structural block diagram of an energy storage system provided in an embodiment of this application.

[0027] Figure 3 This is a flowchart illustrating an arc detection process provided in an embodiment of this application.

[0028] Figure 4 This is a structural block diagram of a computer device provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] In the description of the embodiments of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] An electric arc is a gas discharge phenomenon. In energy storage systems, once a faulty arc occurs, if effective protective measures are not taken, the high temperature generated by the continuous DC arc can easily ignite a fire, leading to explosions of the battery pack and the PCS energy storage converter, causing a major safety accident. PCS stands for Power Conversion System, an energy storage converter. In related arc detection technologies, after detecting an arc (which can be considered a suspected arc), a secondary judgment logic of the entire system is needed to determine whether it is a true or false arc. In related technologies, the secondary judgment logic may compare the current before and after waveform blocking, but waveform blocking causes a rapid decrease in power in a short period of time. Arcing refers to the arcing phenomenon caused by a sudden change in current or voltage during the switching, disconnection, or overload operation of electrical equipment. Waveform blocking technology is used in power electronics and energy storage systems to suppress or cut off current or voltage waveforms in a circuit.

[0032] Off-grid status exists in energy storage systems. For example, when multiple PCS energy storage converters are connected in parallel off-grid, if a single PCS energy storage converter reports arcing (including false and real arcing), the power will decrease for a short period. Other PCS energy storage converters have short-term overload capacity, so it won't affect the normal operation of the load. However, if multiple PCS energy storage converters report arcing simultaneously and execute waveform blocking, it will cause a large-scale power reduction, leading to load shedding. Load shedding refers to the phenomenon where the load equipment stops operating or disconnects from power supply due to power interruption or insufficient power supply.

[0033] Therefore, when the energy storage system is off-grid, it is necessary to find a suitable method to reduce the unstable operation of the load caused by arcing of multiple PCS energy storage converters.

[0034] See Figure 1 , Figure 1 This is a flowchart illustrating a control method provided in an embodiment of this application.

[0035] In order to improve the relevant technology, this application provides a control method for an energy storage system, the energy storage system including multiple PCS energy storage converters, the method including steps S101 to S103.

[0036] Step S101: When the number of target PCS energy storage converters that are operating off-grid in parallel and suspected of arcing is greater than 1, the power supply for the load is switched from the PCS energy storage converter to the first power supply.

[0037] Step S102: Control the target PCS energy storage converter to perform arc extinguishing action.

[0038] Step S103: After the target PCS energy storage converter finishes its arc extinguishing action, the power supply for the load is switched from the first power supply to the PCS energy storage converter.

[0039] In some embodiments, after switching the power supply for the load from the first power supply to the PCS energy storage converter, the method may further include: determining that a real arc has occurred in the energy storage system if the DC current of at least one target PCS energy storage converter is less than a target current threshold; or determining that no real arc has occurred in the energy storage system if the DC current of all target PCS energy storage converters is not less than the target current threshold.

[0040] The target PCS energy storage converter refers to the energy storage converter among multiple PCS energy storage converters that experiences a suspected electric arc. For example, in an energy storage system with 10 PCS energy storage converters, if 3 of them experience a suspected electric arc, these 3 PCS energy storage converters can be called the target PCS energy storage converters. The number N of target PCS energy storage converters can be a non-negative integer. "Off-grid" in the above context refers, for example, to the state where the energy storage system operates independently without being connected to the public power grid.

[0041] In some embodiments, the method can be run on a control module. In some embodiments, the energy storage system may further include a switching switch for switching the power supply to the load. For example, the switching switch may be an Automatic Transfer Switch (ATS), a relay, etc. ATS stands for Automatic Transfer Switch. As an example, an ATS cabinet may be used as the ATS switch. In some embodiments, at least some functional units of the control module may be integrated with the ATS cabinet. In other embodiments, the control module and the ATS cabinet may be set up independently.

[0042] In addition to ATS automatic transfer switches and relays, energy storage systems can also use other methods to switch to power supply for the load, and the above embodiments do not limit this.

[0043] In some embodiments, the method may further include: when the number of target PCS energy storage converters suspected of having an electric arc is 1, controlling the target PCS energy storage converter (PCS) to perform an arc-extinguishing action. The arc-extinguishing action may include, for example, wave blocking or power reduction. In this case, the ATS cabinet may not need to perform any action.

[0044] The above embodiments do not limit the detection method for suspected electric arcs. In some embodiments, before switching the power supply for the load from the PCS energy storage converter to the first power supply, the method may further include: processing the corresponding arc characteristic signal of the PCS energy storage converter using an arc detection model to detect whether a suspected electric arc has occurred in the PCS energy storage converter. The process of acquiring the arc characteristic signal may, for example, include: extracting the time-domain and / or frequency-domain signals from the DC side of the energy storage system; and processing the extracted time-domain and / or frequency-domain signals to obtain the arc characteristic signal.

[0045] In some embodiments, the first power source may include a power consumption side and / or a backup power source. The power consumption side may be the power grid (e.g., an AC power grid or a DC power grid).

[0046] In some embodiments, controlling the target PCS energy storage converter to perform arc extinguishing may include: controlling the target PCS energy storage converter to perform wave blocking; or, setting the power of the target PCS energy storage converter to 0. For example, the target PCS may perform wave blocking, or the output power of the PCS energy storage converter may be set to 0.

[0047] The above embodiments do not limit the target current threshold, which can be selected or set according to actual needs.

[0048] To improve the safety and lifespan of the energy storage system, in some embodiments, the method may further include: controlling the multiple PCS energy storage converters to stop operating in the event of a real electric arc.

[0049] To collect fault information for subsequent data processing or system improvement, in some embodiments, the method may further include: generating arc fault information and sending it to a target device in the event of a real electric arc. The arc fault information may, for example, include the identifier of the target PCS energy storage converter, or, for example, include the identifier of the target PCS energy storage converter whose corresponding DC current is less than a target current threshold. The target device may be, for example, a host computer (or a logger module of the host computer), a console, a designated server, or a staff member's terminal device (e.g., a mobile phone, tablet, desktop computer, smart wearable device, etc.).

[0050] For example, suppose the PCS energy storage converter is operating normally off-grid in parallel and under load. First, an arc detection model detects whether the PCS energy storage converter has experienced a suspected arc (e.g., whether arcing has occurred). If multiple PCSs simultaneously experience suspected arcs (e.g., report arcing), the ATS cabinet connects to the grid or a backup power source to ensure the load can operate normally. Specifically, the arc detection model detects whether a PCS has experienced a suspected arc and sends the detection result to the PCS. After a PCS experiences a suspected arc, it transmits the arc occurrence information (e.g., the arc occurrence information is used to indicate that the corresponding PCS has experienced a suspected arc) to the ATS cabinet. The ATS cabinet makes a comprehensive judgment (e.g., counts the number of PCSs with suspected arcs). As an example, if a single PCS reports an arcing event, that PCS will perform arc-extinguishing actions normally, including actions such as wave blocking and power reduction, while the ATS cabinet will not take any action. If multiple PCSs report an arcing event, the ATS cabinet will switch the load power supply from the PCS power supply to the primary power supply (e.g., the grid or backup power supply), allowing the load to operate normally. The PCS that reported the arcing event (i.e., the target PCS) will then perform arc-extinguishing actions. After the target PCS completes its arc-extinguishing action, the ATS cabinet will switch the load power supply back from the primary power supply to the energy storage system power supply (i.e., the PCS power supply). It will also determine whether the DC current of each target PCS reaches a set threshold (i.e., the target current threshold). If the DC current of all target PCSs reaches the set threshold, the energy storage system is considered not to have experienced a real arc (e.g., a false arcing). If the DC current of at least one target PCS fails to reach the set threshold, the energy storage system is considered to have experienced a real arc.

[0051] The above method improves the problem of load instability caused by multiple PCS (Power Control System) reports of arcing in off-grid energy storage. In related technologies, after a PCS is suspected of experiencing arcing, it is notified. The PCS then compares the current before and after performing arc-extinguishing actions to determine if it is a real arc. However, performing arc-extinguishing actions causes a significant drop in power within a short period. The above embodiment not only enables the differentiation between real and false arcing in off-grid energy storage but also improves the problem of significant power reduction and load instability caused by multiple PCS reports of arcing in off-grid energy storage by switching power from the grid or backup power source to the load, thus ensuring the normal operation of the load.

[0052] This application embodiment also provides a control module, which includes a switching control unit and an arc-extinguishing control unit. The switching control unit is used to switch the power supply to the load from the target PCS energy storage converter to a first power supply when multiple PCS energy storage converters are operating off-grid in parallel and the number of target PCS energy storage converters suspected of experiencing an arc is greater than one. The arc-extinguishing control unit is used to control the target PCS energy storage converter to perform an arc-extinguishing action. The switching control unit is also used to switch the power supply to the load from the first power supply to the target PCS energy storage converter after the target PCS energy storage converter has completed its arc-extinguishing action.

[0053] In some embodiments, the control module may further include a receiving unit for receiving arc occurrence information from target PCS. The arc occurrence information is used to indicate that a suspected arc has occurred in the corresponding target PCS. In this way, the control module can receive arc occurrence information from each target PCS, thereby determining the number of target PCS where a suspected arc has occurred.

[0054] In some embodiments, the control module may further include a judgment unit. The judgment unit is configured to determine that a real arc has occurred if the DC current of at least one target PCS energy storage converter is less than the target current threshold; or, if the DC current of all target PCS energy storage converters is not less than the target current threshold, determine that no real arc has occurred.

[0055] In some embodiments, the control module may also store an arc detection model, which is used to process the corresponding arc characteristic signals of the PCS energy storage converter to detect whether the PCS energy storage converter has a suspected arc.

[0056] This application also provides a PCS energy storage converter, which includes any of the control modules described above.

[0057] This application also provides an energy storage system, which includes multiple PCS energy storage converters and any of the above-mentioned control modules.

[0058] In some embodiments, the energy storage system may further include a switching switch; the switching switch is used to switch the power supply to the load. In some embodiments, the switching switch may be an Automatic Transfer Switch (ATS) or a relay. For example, an ATS can realize the switching of power supply to the load, such as selecting an energy storage system, the power grid, or a backup power source to supply power to the load. Furthermore, the ATS may have the function of communicating with a PCS and other control devices to achieve coordinated control and status detection.

[0059] The control module in the above embodiments can be set independently, or at least some functional units of the control module can be integrated with other devices. In some embodiments, the receiving unit and / or switching control unit of the control module can be integrated with the ATS automatic transfer switch. In some embodiments, the arc extinguishing control unit and the judgment unit of the control module can be integrated with the PCS energy storage converter.

[0060] In some embodiments, at least a portion of the control module may be located inside the PCS energy storage converter. In other embodiments, at least a portion of the control module may be located outside the PCS energy storage converter. That is, the control module may be located inside the PCS and store electronic devices capable of storing programs and variables and supporting information interaction (in this case, the control module can be considered a component of the PCS); or, the control module may be located outside the PCS and store electronic devices capable of storing programs and variables and supporting information interaction, and be able to establish communication with the PCS.

[0061] In some embodiments, the energy storage system may further include a first power source, which may include a power consumption side and / or a backup power source.

[0062] In some embodiments, the power consumption side may include an AC side and / or a DC side. The power consumption side is, for example, a power grid; the AC side is, for example, an AC power grid; and the DC side is, for example, a DC power grid.

[0063] In some embodiments, the backup power supply may be a microgrid system comprising a generator, a UPS (Uninterruptible Power Supply), and a PCS (Polymerized Circuit-Converter) energy storage converter. Alternatively, in other embodiments, the backup power supply may be a microgrid system comprising an inverter. Or, in still other embodiments, the backup power supply may be a microgrid system comprising a PCS energy storage converter and an inverter. The inverter may be, for example, a photovoltaic inverter.

[0064] In the above embodiments, UPS stands for Uninterruptible Power Supply. As an example, an uninterruptible power supply can be a device that continuously provides backup AC power to the load and maintains the normal operation of electrical appliances in the event of power grid anomalies (such as power outages, undervoltage, interference, or surges).

[0065] In some embodiments, the energy storage system may further include a battery pack and a load. As an example, the battery pack may include one or more batteries.

[0066] See Figure 2 and Figure 3 , Figure 2 This is a structural block diagram of an energy storage system provided in an embodiment of this application. Figure 3This is a flowchart illustrating an arc detection process provided in an embodiment of this application.

[0067] For example, suppose an energy storage system includes a control module, battery pack, PCS, ATS cabinet, load, power grid, and backup power supply. In a specific application scenario, the arc detection process of this energy storage system is as follows.

[0068] Step S1: The machine (e.g., PCS) is powered on and performs parameter initialization after receiving the initialization parameters from the host computer.

[0069] Step S2: The PCS operates off-grid, collects signals (e.g., time-domain and / or frequency-domain signals from the DC side), extracts arc characteristic signals from the collected signals, inputs them into the arc detection model, and determines whether arcing has occurred through the arc detection model; if arcing has occurred, proceed to step S3.

[0070] Step S3: After the arc detection model detects an arc, the PCS transmits the arc occurrence information to the ATS cabinet. The ATS cabinet determines whether multiple PCSs have reported an arc. If so (i.e., more than one target PCS reports an arc), the ATS cabinet switches the load's energy source from the PCS to the grid or backup power. After the switch is complete, the power of the PCS is reduced to 0, and step S4 is executed. If not (i.e., only one target PCS reports an arc), the target PCS performs an arc extinguishing action and checks whether a real arc has occurred. If a real arc has occurred on the target PCS, step S5 is executed; if no real arc has occurred on the target PCS, step S2 is executed.

[0071] Step S4: The ATS cabinet switches the load power supply from the grid or backup power supply back to the PCS; the control module determines whether the DC current of the target PCS that reported the arcing can reach the set threshold (i.e., the target current threshold); if all can reach the threshold, the control module determines that it is a false arcing, returns to step S2, and continues to collect signals; if the DC current of at least one target PCS does not reach the set threshold, it is determined that a real arc has occurred, and step S5 is executed.

[0072] Step S5: The entire machine fails and shuts down, reporting an arcing fault. Here, "entire machine" refers to, for example, multiple PCS units.

[0073] In relevant arc detection technologies, the collected signals are processed and input into the arc detection model for the first step of judgment. However, since the PCS is often offline, relying solely on the results of the arc detection model can easily lead to false alarms, causing malfunctions and shutdowns, and affecting the normal operation of the load. Furthermore, when multiple PCSs report arcing simultaneously, determining whether it is a genuine arc by comparing the current before and after the arc extinguishing action also affects the normal operation of the load.

[0074] Applying the aforementioned energy storage system in a PCS off-grid state, firstly, an arc detection model is used to detect whether a suspected arc has occurred in the PCS. The PCS transmits the arc occurrence information to the ATS cabinet. The ATS cabinet determines whether multiple PCSs are arcing. If multiple PCSs are arcing, the ATS cabinet switches the power supply to the load from the PCS to the grid or a backup power source. Therefore, the impact of power reduction on the normal operation of the load when multiple PCSs simultaneously perform arc extinguishing actions can be reduced.

[0075] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements any of the above methods.

[0076] This application also provides a computer program product, which includes a computer program that, when executed by a processor, implements any of the methods described above.

[0077] The computer program product may be in the form of a portable compact disc read-only memory (CD-ROM) and include program code, and may run on a terminal device, such as a personal computer. However, the computer program product of this application is not limited thereto, and the computer program product may be in any combination of one or more computer-readable media.

[0078] This application also provides a chip for performing any of the above methods.

[0079] See Figure 4 , Figure 4 This is a structural block diagram of a computer device provided in an embodiment of this application.

[0080] This application also provides a computer device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement any of the methods described above.

[0081] The embodiments of this application do not limit the computer device, which may be, for example, a local computer device, a cloud computer device, a distributed computer device, etc.

[0082] The computer device may include: a memory 110, a processor 120, and a communication interface 130. The memory 110, the processor 120, and the communication interface 130 are connected through internal connection paths.

[0083] The memory 110 is used to store computer programs, which in some implementations may include code for implementing the methods of the embodiments of this application.

[0084] The processor 120 executes the computer program stored in the memory 110 to control the communication interface 130 to receive input data and information, and output operation results and other data. In some implementations, when the solutions of the embodiments of this application are implemented by software or firmware, the computer program used to implement the solutions of the embodiments of this application can be stored in the processor 120 and executed by the processor 120.

[0085] The memory 110 may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory may be random access memory (RAM). It should be noted that the memory 110 described herein is intended to include, but is not limited to, any memory of these and other suitable types. As an example, the memory 110 includes random access memory (RAM), cache memory, and read-only memory (ROM). The memory 110 stores a computer program that can be executed by processor 120, causing processor 120 to implement the steps of any of the methods described above.

[0086] The processor 120 can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor 120 can be any conventional processor.

[0087] In implementation, each step of the above method can be completed by the integrated logic circuitry of the hardware in the processor 120 or by instructions in software form. The method disclosed in the embodiments of this application can be directly implemented by the hardware processor, or by a combination of hardware and software modules in the processor 120. The software modules can be located in mature storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in the memory 110, and the processor 120 reads the information in the memory 110 and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are not provided here.

[0088] In some implementations, in addition to the hardware units described above, computer devices may also include software modules, such as operating systems, basic input / output systems (BIOS), and application software.

[0089] An operating system is used to manage the hardware and / or software resources of a computer device; it is the kernel and foundation of the computer. The operating system handles fundamental tasks such as managing and configuring memory, determining the priority of system resource allocation, controlling input and output devices, operating the network, and managing the file system. To facilitate user operation, most operating systems provide a user interface for interaction with the system.

[0090] The BIOS is used to perform hardware initialization during the power-on boot phase and to provide runtime services for the operating system and applications. In some implementations, the BIOS can also monitor and display processor temperature and execute temperature protection strategies.

[0091] Application software, also known as an application program, can be understood as software written for a specific user application purpose, and is one of the main categories of computer software. For example, application software can be a program used to achieve purposes such as power control and temperature management.

[0092] It is understood that the specific examples in this application are only intended to help those skilled in the art better understand the implementation of this application, and are not intended to limit the scope of protection of this application.

[0093] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this application.

[0094] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and this application does not limit them.

[0095] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0096] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0097] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the embodiments described above can be referred to the corresponding processes in other embodiments, and will not be repeated here.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0099] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the technical solution in this application, depending on actual needs.

[0100] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0101] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, essentially, or the part that contributes to the prior art, or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0102] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A control method, characterized in that, Applied to an energy storage system, the energy storage system comprising multiple PCS energy storage converters, the method includes: When the number of target PCS energy storage converters that are suspected of having an electric arc is greater than 1 and the number of PCS energy storage converters that are operating off-grid in parallel is greater than 1, the power supply for the load will be switched from the PCS energy storage converter to the first power supply. Control the target PCS energy storage converter to perform arc extinguishing action; After the target PCS energy storage converter finishes its arc extinguishing action, the power supply for the load will be switched from the first power supply to the PCS energy storage converter.

2. The control method according to claim 1, characterized in that, After switching the power supply for the load from the first power supply to the PCS energy storage converter, the method further includes: If the DC current of at least one target PCS energy storage converter is less than the target current threshold, the energy storage system is deemed to have experienced a real electric arc; or, if the DC current of all target PCS energy storage converters is not less than the target current threshold, the energy storage system is deemed not to have experienced a real electric arc.

3. The control method according to claim 1, characterized in that, Before switching the power supply for the load from the PCS energy storage converter to the first power supply, the method further includes: An arc detection model is used to process the corresponding arc characteristic signals of the PCS energy storage converter in order to detect whether a suspected arc has occurred in the PCS energy storage converter.

4. The control method according to claim 1, characterized in that, The control of the target PCS energy storage converter to perform arc extinguishing action includes: Control the target PCS energy storage converter to perform a wave blocking action; or... Set the power of the target PCS energy storage converter to 0.

5. The control method according to claim 2, characterized in that, The method further includes: In the event of a real electric arc, the multiple PCS energy storage converters are controlled to stop operating, and an arc fault information is generated and sent to the target device.

6. A control module, characterized in that, The control module includes a switching control unit and an arc extinguishing control unit; The switching control unit is used to switch the power supply for the load from the PCS energy storage converter to the first power supply when multiple PCS energy storage converters are operating off-grid in parallel and the number of target PCS energy storage converters with suspected electric arc is greater than 1. The arc extinguishing control unit is used to control the target PCS energy storage converter to perform arc extinguishing actions; The switching control unit is also used to switch the power supply for the load from the first power supply to the PCS energy storage converter after the target PCS energy storage converter finishes its arc extinguishing action.

7. The control module according to claim 6, characterized in that, The control module also includes a judgment unit; The judgment unit is used to determine that a real arc has occurred if the DC current of at least one target PCS energy storage converter is less than the target current threshold; or, if the DC current of all target PCS energy storage converters is not less than the target current threshold, it is determined that no real arc has occurred.

8. The control module according to claim 6, characterized in that, The control module also stores an arc detection model, which is used to process the corresponding arc characteristic signals of the PCS energy storage converter to detect whether the PCS energy storage converter has a suspected arc.

9. A PCS energy storage converter, characterized in that, The PCS energy storage converter includes the control module as described in any one of claims 6 to 8.

10. An energy storage system, characterized in that, The energy storage system includes: Multiple PCS energy storage converters; The control module according to any one of claims 6 to 8.

11. The energy storage system according to claim 10, characterized in that, The energy storage system also includes a switching switch; The switching switch is used to switch the power supply to the load.

12. The energy storage system according to claim 10, characterized in that, At least some units of the control module are located inside the PCS energy storage converter; or, at least some units of the control module are located outside the PCS energy storage converter.

13. The energy storage system according to claim 10, characterized in that, The energy storage system also includes a first power source, which includes a power consumption side and / or a backup power source.

14. The energy storage system according to claim 13, characterized in that, The power supply side includes the AC side and / or the DC side.

15. The energy storage system according to claim 13, characterized in that, The backup power supply is a microgrid system that includes a generator, a UPS uninterruptible power supply, and a PCS energy storage converter; or, the backup power supply is a microgrid system that includes an inverter; or, the backup power supply is a microgrid system that includes a PCS energy storage converter and an inverter.

16. A computer device, characterized in that, The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method of any one of claims 1 to 5.

17. A chip, characterized in that, The chip is used to perform the method according to any one of claims 1 to 5.

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