Energy storage system automatic grid-connected and off-grid switching method, device, equipment and storage medium

Abstract

The application relates to the technical field of energy storage manufacturing, and discloses an automatic grid-connected and off-grid switching method, device, equipment and storage medium for an energy storage system, the method comprising the following steps: collecting electrical data of a power grid side, a load side and an energy storage side; processing the electrical data, and judging whether to perform grid-connected and off-grid switching based on preset grid-connected and off-grid switching conditions; and implementing the grid-connected and off-grid switching based on a preset automatic switching switch. The device, the equipment and the storage medium all correspond to the method. According to the application, the automatic switching switch is combined with the grid-connected and off-grid switching conditions, power supply to key loads borne in the switching process is not interrupted or only has an extremely short acceptable voltage fluctuation, and the technical problems of slow response, no intelligent judgment and large impact during automatic switching in the prior art are solved.

Description

Technical Field

[0001] This application relates to the field of energy storage manufacturing technology, specifically a method, apparatus, equipment, and storage medium for automatic grid-connected and off-grid switching of an energy storage system. Background Technology

[0002] Existing, immature automatic switching technologies mainly rely on manual operation or simple static switches, which have the following problems: Slow response: Manual operation cannot meet the millisecond-level switching requirements, which may lead to power outages.

[0003] Lack of intelligent judgment: Early devices could not accurately judge power grid faults and instantaneous fluctuations, and were prone to false alarms or failure to operate.

[0004] High impact: Switching may generate huge current and voltage surges, which can damage equipment. Summary of the Invention

[0005] The purpose of this application is to provide a method, device, equipment and storage medium for automatic switching between grid and off-grid in an energy storage system, so as to solve the technical problems of slow response, lack of intelligent judgment and large impact during automatic switching in the prior art.

[0006] To achieve the above objectives, this application provides an automatic grid-connected / off-grid switching method for an energy storage system, comprising: collecting electrical data from the grid side, load side, and energy storage side; processing the electrical data and determining whether to perform grid-connected / off-grid switching based on preset grid-connected / off-grid switching conditions; and implementing grid-connected / off-grid switching based on a preset automatic transfer switch.

[0007] Preferably, the electrical data includes voltage, current, phase, and frequency; the grid-connected / off-grid switching conditions include detecting overvoltage, undervoltage, overcurrent, phase change, and frequency change.

[0008] Preferably, the automatic transfer switch includes a first transfer switch and a second transfer switch; wherein the first transfer switch is connected between the energy storage side and the load side, and the second transfer switch is connected between the grid side and the load side.

[0009] Preferably, the grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data of the grid side, load side and energy storage side are all normal, the first switching switch and the second switching switch are closed, and the energy storage system operates in grid-connected mode.

[0010] Preferably, the grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data on the grid side is abnormal, the second switching switch is disconnected, and the energy storage system operates in off-grid mode.

[0011] Preferably, the grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data on the load side is abnormal, disconnecting the first switching switch and the second switching switch, and the energy storage system does not switch operating modes.

[0012] Preferably, the grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data on the energy storage side is abnormal, the first switching switch is disconnected, the energy storage system does not switch operating modes, and the energy storage system trips.

[0013] To achieve the above objectives, this application also provides an automatic grid-connected / off-grid switching device for an energy storage system, which applies the automatic grid-connected / off-grid switching method for an energy storage system as described above, including a data acquisition module, a processing module, and an execution module; wherein: the data acquisition module is used to acquire electrical data from the grid side, the load side, and the energy storage side; the processing module is used to process the electrical data and determine whether to perform grid-connected / off-grid switching based on preset grid-connected / off-grid switching conditions; the execution module is used to implement grid-connected / off-grid switching based on a preset automatic transfer switch.

[0014] To achieve the above objectives, this application also provides an automatic grid-connected / off-grid switching device for an energy storage system, including at least one processor, at least one memory, and a data bus; The processor and the memory communicate with each other via the data bus; The memory stores program instructions that can be executed by the processor, which calls the program instructions to execute the automatic on-grid and off-grid switching method for the energy storage system as described above.

[0015] To achieve the above objectives, this application also provides a storage medium storing a computer program thereon, which, when executed by a processor, implements the automatic on-grid and off-grid switching method for the energy storage system as described above.

[0016] Beneficial effects: The automatic grid-connected and off-grid switching method, device, equipment and storage medium of the energy storage system of this application, through automatic switching switch and combined with grid-connected and off-grid switching conditions, realizes that the power supply to the key loads carried during the switching process is uninterrupted or only has a very short time of acceptable voltage fluctuation, which solves the technical problems of slow response, lack of intelligent judgment and large impact during automatic switching in the prior art. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the automatic grid-connected / off-grid switching method for the energy storage system provided in this embodiment; Figure 2 A diagram illustrating the applicable scenarios for the automatic grid-connected / off-grid switching method for the energy storage system provided in this embodiment; Figure 3 The diagram shows the structure of the automatic grid-connected / off-grid switching device for the energy storage system provided in this embodiment; in the diagram: 10, acquisition module; 20, processing module; 30, execution module.

[0019] The implementation, functional features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] In this document, the term "comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] In response to the technical problems of slow response, lack of intelligent judgment and large impact during automatic switching in the prior art, this embodiment discloses an automatic grid-connected and off-grid switching method, device, equipment and storage medium for energy storage systems.

[0023] The automatic grid-connected / off-grid switching of the energy storage system in this embodiment will now be described. Automatic grid-connected / off-grid switching refers to the ability of the energy storage system to automatically, quickly, and smoothly switch between two operating modes based on the state of the power grid; wherein, the state of the power grid includes being energized or de-energized, and the energy storage system corresponds to the energy storage side in this embodiment.

[0024] Energy storage systems operate in two modes: grid-connected and off-grid. In grid-connected mode, the system connects to the mains power grid to supply power to the loads. In this mode, the system typically performs peak shaving, power quality regulation, and backup energy storage. In off-grid mode, when a grid outage is detected, such as a fault or power failure, the energy storage system quickly disconnects from the grid and independently forms a local microgrid to continue supplying power to critical loads; this is often referred to as islanding operation.

[0025] The core objective of the energy storage system in this embodiment for automatic grid-connected and off-grid switching is seamless switching, that is, ensuring that the power supply to the critical loads carried by the system is uninterrupted or only experiences very brief and acceptable voltage fluctuations during the switching process.

[0026] Based on the above theoretical foundation, the automatic grid-connected / off-grid switching method of the energy storage system in this embodiment will now be described.

[0027] In a first aspect, this embodiment discloses an automatic grid-connected / off-grid switching method for an energy storage system, comprising: collecting electrical data from the grid side, the load side, and the energy storage side; processing the electrical data and determining whether to perform grid-connected / off-grid switching based on preset grid-connected / off-grid switching conditions; and implementing grid-connected / off-grid switching based on a preset automatic switching switch.

[0028] Reference Figure 1 and Figure 2 , Figure 1 This is a flowchart of the automatic grid-connected / off-grid switching method for the energy storage system provided in this embodiment. Figure 2 This diagram illustrates the applicable scenarios for the automatic grid-connected / off-grid switching method for the energy storage system provided in this embodiment.

[0029] like Figure 1 As shown, combined with Figure 2 In practical applications, the automatic grid connection / off-grid switching method for the energy storage system in this embodiment is performed based on the following steps: S10: The preset detection section collects electrical data from the grid side, load side, and energy storage side.

[0030] In application, the electrical data in S10 can include voltage, current, phase and frequency, etc. The detection part in S10 can be connected to existing fault identification models based on electrical data on the energy storage side, grid side and load side, such as machine learning models, which aim to achieve fault detection based on voltage, current, phase and frequency, etc. The result of the fault detection corresponds to the setting of grid-connected and off-grid switching conditions.

[0031] S20: The detection section uploads the collected electrical data to the preset energy storage system energy management system (EMS).

[0032] It should be noted that the EMS used in this embodiment can be any existing one, and this embodiment does not impose any restrictions on it.

[0033] S30: The EMS processes the uploaded data such as voltage, current, phase, and frequency, and determines whether the grid-connected / off-grid switching conditions are met.

[0034] In applications, the conditions for switching between on-grid and off-grid include detecting overvoltage, undervoltage, overcurrent, phase change, and frequency change.

[0035] S40: Based on the judgment result, the EMS issues the grid-connected operation mode or off-grid operation mode to the energy storage side, and at the same time, the EMS issues control commands to the automatic transfer switch to coordinate the grid-connected and off-grid switching of the energy storage side.

[0036] The logic of automatic grid-connected and off-grid switching of the energy storage system in this embodiment will now be described in detail.

[0037] To achieve seamless switching, this embodiment includes an automatic transfer switch. In one application, the automatic transfer switch can be a circuit breaker.

[0038] Combination Figure 2 Specifically, the automatic transfer switch includes a first transfer switch QF1 and a second transfer switch QF2; wherein the first transfer switch is connected between the energy storage side and the load side, and the second transfer switch is connected between the grid side and the load side.

[0039] In the specific application of this embodiment, when the electrical data on the grid side, load side, and energy storage side are all normal, the first and second switching switches are closed, and the energy storage system operates in grid-connected mode. In actual execution, the EMS issues closing commands to the automatic switching switches QF1 and QF2, and the EMS issues grid-connected operation commands to the preset PCS (Power Conversion System) on the energy storage side, thus putting the energy storage side into grid-connected operation mode.

[0040] In response to electrical data anomalies, when voltage, current, phase, and frequency data are abnormal, the EMS needs to identify the source of the anomaly, specifically pointing to the grid side, load side, and energy storage side.

[0041] In the specific application of this embodiment, when the electrical data on the grid side is abnormal, the second switching switch is disconnected, and the energy storage system operates in off-grid mode. In actual execution, if it is determined that the electrical data on the grid side is abnormal, the second switching switch QF2 connecting the grid side and the energy storage side is disconnected, and the energy storage side immediately switches to off-grid operation mode to continuously supply power to the load.

[0042] In the specific application of this embodiment, when the electrical data on the load side is abnormal, the first switching switch and the second switching switch are disconnected, and the energy storage system does not switch its operating mode. In specific execution, if it is determined that the electrical data on the load side is abnormal, the first switching switch QF1 and the first switching switch QF2 connecting the load side to the energy storage side and the grid side are disconnected, and the energy storage side does not switch its operating mode.

[0043] In the specific application of this embodiment, when the electrical data on the energy storage side is abnormal, the first switching switch is disconnected, the energy storage system does not switch its operating mode, and the energy storage system trips for protection. In specific execution, if it is determined that the electrical data on the energy storage side is abnormal, the first switching switch QF1 connecting the energy storage side to the load side and the grid side is disconnected, the energy storage side does not switch its operating mode, and the energy storage system trips for protection.

[0044] Thus, the automatic grid-connected / off-grid switching method for energy storage systems in this embodiment solves the technical problems of slow response, lack of intelligent judgment, and large impact during automatic switching in the prior art.

[0045] Reference Figure 3 , Figure 3 The diagram shows the structure of the automatic grid-connected / off-grid switching device for the energy storage system provided in this embodiment; in the diagram: 10, acquisition module; 20, processing module; 30, execution module.

[0046] like Figure 3 As shown, in a second aspect, this embodiment also discloses an automatic grid-connected / off-grid switching device for an energy storage system, which applies the automatic grid-connected / off-grid switching method for an energy storage system as described above, including a data acquisition module 10, a processing module 20, and an execution module 30.

[0047] The acquisition module 10 is used to acquire electrical data from the grid side, load side and energy storage side.

[0048] The processing module 20 is used to process electrical data and determine whether to perform grid-connected or off-grid switching based on preset grid-connected / off-grid switching conditions.

[0049] The execution module 30 is used for switching between on-grid and off-grid operations based on a preset automatic transfer switch.

[0050] Thirdly, this embodiment also discloses an automatic grid-connected / off-grid switching device for an energy storage system, including at least one processor, at least one memory, and a data bus; The processor and the memory communicate with each other via the data bus; The memory stores program instructions that can be executed by the processor, which calls the program instructions to execute the automatic on-grid and off-grid switching method for the energy storage system as described above.

[0051] Fourthly, this embodiment also discloses a storage medium storing a computer program thereon, which, when executed by a processor, implements the automatic on-grid and off-grid switching method for the energy storage system as described above.

[0052] It should be noted that the automatic grid connection / off-grid switching device, equipment, and storage medium of the energy storage system in this embodiment correspond to the aforementioned automatic grid connection / off-grid switching method of the energy storage system. Therefore, any content not specifically described in the automatic grid connection / off-grid switching device, equipment, and storage medium of the energy storage system in this embodiment, including but not limited to functional definitions, working principles, and technical effects, can be referred to the description in the aforementioned automatic grid connection / off-grid switching method of the energy storage system, and will not be repeated here.

[0053] In summary, the automatic grid-connected and off-grid switching method, apparatus, equipment, and storage medium of the energy storage system in this embodiment, through an automatic switching switch combined with grid-connected and off-grid switching conditions, achieves uninterrupted power supply to the critical loads during the switching process or only very brief acceptable voltage fluctuations, solving the technical problems of slow response, lack of intelligent judgment, and large impact during automatic switching in the prior art.

[0054] In the embodiments provided in this application, it should be understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, code, or any suitable combination thereof. For hardware implementation, the processor may be implemented in one or more of the following: application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to implement the functions described herein, or combinations thereof. For software implementation, some or all of the processes of the embodiments may be performed by a computer program instructing the associated hardware. During implementation, the program may be stored in a computer-readable storage medium or transmitted as one or more instructions or code on a computer-readable storage medium. Computer-readable storage media include computer storage media and communication media, wherein communication media include any medium that facilitates the transmission of a computer program from one place to another. Storage media may be any available medium accessible to a computer. Computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code having the form of instructions or data structures and accessible to a computer.

[0055] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for automatic grid-connected / off-grid switching of an energy storage system, characterized in that, include: Collect electrical data from the grid side, load side, and energy storage side; process the electrical data and determine whether to perform grid-connection / off-grid switching based on preset grid-connection / off-grid switching conditions; grid-connection / off-grid switching is implemented based on preset automatic transfer switches.

2. The automatic grid-connected / off-grid switching method for energy storage systems according to claim 1, characterized in that, The electrical data includes voltage, current, phase, and frequency; the grid-connected / off-grid switching conditions include detecting overvoltage, undervoltage, overcurrent, phase change, and frequency change.

3. The automatic grid-connected / off-grid switching method for energy storage systems according to claim 1, characterized in that, The automatic transfer switch includes a first transfer switch and a second transfer switch; wherein the first transfer switch is connected between the energy storage side and the load side, and the second transfer switch is connected between the grid side and the load side.

4. The automatic grid-connected / off-grid switching method for energy storage systems according to claim 3, characterized in that, The grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data of the grid side, load side and energy storage side are all normal, the first switching switch and the second switching switch are closed, and the energy storage system operates in grid-connected mode.

5. The automatic grid-connected / off-grid switching method for an energy storage system according to claim 4, characterized in that, The grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data on the grid side is abnormal, the second switching switch is disconnected, and the energy storage system operates in off-grid mode.

6. The automatic grid-connected / off-grid switching method for an energy storage system according to claim 4, characterized in that, The grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data on the load side is abnormal, the first switching switch and the second switching switch are disconnected, and the energy storage system does not switch operating modes.

7. The automatic grid-connected / off-grid switching method for an energy storage system according to claim 4, characterized in that, The grid-connected / off-grid switching is implemented based on a preset automatic switching switch, including: when the electrical data on the energy storage side is abnormal, the first switching switch is disconnected, the energy storage system does not switch operating modes, and the energy storage system trips.

8. An automatic grid-connected / off-grid switching device for an energy storage system, employing the automatic grid-connected / off-grid switching method for an energy storage system as described in any one of claims 1 to 7, characterized in that, It includes a data acquisition module, a processing module, and an execution module; wherein: the data acquisition module is used to acquire electrical data from the grid side, the load side, and the energy storage side; the processing module is used to process the electrical data and determine whether to perform grid connection or disconnection based on preset grid connection / disconnection switching conditions; the execution module is used to implement grid connection / disconnection switching based on preset automatic transfer switches.

9. An automatic grid-connected / off-grid switching device for an energy storage system, characterized in that, Includes at least one processor, at least one memory, and a data bus; The processor and the memory communicate with each other via the data bus; The memory stores program instructions that can be executed by the processor, which invokes the program instructions to execute the automatic grid-connected / off-grid switching method for the energy storage system according to any one of claims 1 to 7.

10. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the automatic grid-connected / off-grid switching method for the energy storage system as described in any one of claims 1 to 7.

Images