Insulation state detection method, system, apparatus, storage medium, and program product

Abstract

This application relates to an insulation fault detection method, system, device, storage medium, and program product. The method is applied to an energy management system, in which the energy management system is communicatively connected to a plurality of test assemblies and an insulation detection module, and each test assembly and insulation detection module are connected in parallel to the same DC bus. The method includes, in response to the insulation detection module being in an on state, sequentially performing insulation fault detection on each test assembly and energy storage system by the insulation detection module in accordance with the voltage application and voltage interruption timing of each test assembly. The method simplifies and reduces the complexity of the insulation fault detection process for the energy storage system.

Description

Technical Field

[0001] [Cross-reference to Related Applications] This application claims the benefit of Chinese Patent Application No. 2022114741507, filed on November 23, 2022, entitled "Insulation State Detection Method, System, Device, Storage Medium and Program Product", the entire content of which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of power technology, and particularly to an insulation state detection method, system, device, storage medium and program product.

Background Art

[0003] With the rapid development of energy storage technology, energy storage systems have already been widely applied in the case of large amounts of energy. Therefore, ensuring the safety of energy storage systems is of great importance.

[0004] Usually, by inspecting various faults in an energy storage system, the safe and stable operation of the energy storage system can be guaranteed. For example, the faults of an energy storage system can include insulation faults, leakage current faults, temperature faults, etc. Taking the insulation fault as an example, in the process of detecting insulation faults in an energy storage system, in some cases, since each assembly of each branch in the energy storage system is detected one by one, the process of detecting insulation faults in the energy storage system becomes complicated.

Summary of the Invention

[0005] Based on this, there is a need to provide an insulation state detection method, system, device, storage medium and program product that can simplify the insulation fault detection process of an energy storage system and reduce the complexity of the insulation fault detection process of the energy storage system for the above technical problems.

[0006] In a first embodiment, the present invention relates to an insulation state detection method applicable to an energy management system, wherein the energy management system is communicatively connected to a plurality of assemblies under test and a single insulation detection module, each of which is connected in parallel to the same DC busbar, and this method is... The present invention provides an insulation state detection method that includes the step of sequentially performing insulation state detection on each assembly under test and an energy storage system by the insulation detection module in response to the insulation detection module being in an ON state, according to the voltage application and voltage cutoff timing of each assembly under test.

[0007] In the technical solution of the embodiment of the present invention, the energy management system is communicatively connected to multiple assemblies under test and one insulation detection module, and simultaneously, each assembly under test and the insulation detection module are connected in parallel to the same DC bus. With this implementation configuration, the circuit connection relationship is simplified, and in the insulation state detection process, the insulation state of multiple assemblies under test and energy storage systems can be detected by only one insulation detection module, thereby reducing the hardware cost input in the insulation state detection process. Furthermore, when performing insulation state detection on each assembly under test and energy storage system, it is performed in accordance with the voltage application and voltage cutoff timing of each assembly under test. In this way, based on a simple circuit connection configuration, it is possible to sequentially perform insulation state detection on each assembly under test and energy storage system at set voltage application and voltage cutoff timings, thereby reducing interaction in the detection process, simplifying the insulation fault detection process for each assembly under test and energy storage system, and reducing the complexity of the insulation fault detection process for energy storage systems.

[0008] In one embodiment, the voltage application and cutoff timings include low voltage application states and high voltage application timings, and the step of sequentially performing insulation state detection on each assembly and energy storage system by the insulation detection module according to the voltage application and cutoff timings of each assembly under test is as follows: The steps include acquiring the low-voltage application state of each assembly under test and the high-voltage application timing of the high-voltage assembly among the assemblies under test, The method includes the step of sequentially performing insulation state detection on each assembly and the energy storage system using an insulation detection module, in accordance with the low voltage application state of each assembly and the high voltage application timing of the high voltage assembly among the assemblies under test.

[0009] In the technical solution of the embodiment of the present invention, the voltage application and cutoff timing of each assembly under test is divided into a low-voltage application state and a high-voltage application timing for each assembly under test. In this way, when the insulation detection module performs insulation state detection on each assembly under test and the energy storage system, it can be further subdivided to instruct the detection logic on the low-voltage application state of each assembly under test and the high-voltage application timing of the high-voltage assembly among the assemblies under test. The voltage application timing of the energy storage system itself is to first apply a low voltage and then a high voltage, which corresponds to setting the voltage application and cutoff timing according to the voltage application needs of the assembly itself in the energy storage system, thereby providing higher reliability when performing insulation state detection on each assembly under test and the energy storage system. In several exemplary embodiments, the high-voltage application timing is the timing for the high-voltage assembly, and high voltage is applied to the high-voltage assembly in a specific order, enabling the insulation detection module to sequentially detect the insulation state of the high-voltage assembly. This reduces the number of interactions in the insulation state detection of the high-voltage assembly, not only lowering the complexity of the insulation state detection of the high-voltage assembly, but also significantly shortening the time required to perform insulation state detection on the high-voltage assembly, thereby improving the efficiency of insulation state detection.

[0010] In one embodiment, the step of sequentially detecting the insulation state of each assembly under test and the energy storage system using an insulation detection module, according to the low voltage application state of each assembly under test and the high voltage application timing of the high voltage assembly among the assemblies under test, is as follows: The steps include: applying a low voltage to each assembly under test, then using an insulation detection module to detect the insulation state of the low-voltage assembly among the assemblies under test; If the insulation state detection of the low-voltage assembly is successful, the insulation detection module performs insulation state detection on each high-voltage assembly and the energy storage system in accordance with the high-voltage application timing of each high-voltage assembly among the assemblies under test.

[0011] In the technical solution of the embodiment of the present invention, after applying a low voltage to each assembly under test, the insulation detection module can perform insulation state detection on the low-voltage assembly among the assemblies under test. If the insulation state detection of the low-voltage assembly is successful, the insulation detection module performs insulation state detection on each high-voltage assembly and the energy storage system according to the high-voltage application timing of each high-voltage assembly among the assemblies under test. In this invention, the voltage application process is divided into low-voltage application and high-voltage application, and each assembly under test is also divided accordingly into a low-voltage assembly and a high-voltage assembly. During the low-voltage application and high-voltage application processes, the insulation detection module sequentially performs insulation state detection on the low-voltage assembly and the high-voltage assembly, and the insulation state detection results for the entire low-voltage assembly and the entire high-voltage assembly of each assembly under test can be determined. In some exemplary embodiments, the insulation detection module further performs insulation state detection on multiple high-voltage assemblies of each assembly under test according to the high-voltage application timing of the high-voltage assembly, thereby reducing the number of interactions in the low-voltage application and high-voltage application detection processes for each assembly under test, and further reducing the complexity of the detection process for each assembly under test.

[0012] In one embodiment, the step of detecting the insulation state of the low-voltage assembly among the assemblies under test using an insulation detection module is: The steps include obtaining the insulation resistance value of the low-voltage assembly detected by the insulation detection module, The method includes the step of determining the insulation state detection result of a low-voltage assembly based on the insulation resistance value of the low-voltage assembly.

[0013] In the technical solution of the embodiment of the present invention, the insulation detection module does not need to specifically distinguish low-voltage assemblies when detecting them, the insulation resistance value of all low-voltage assemblies can be quickly detected by the insulation detection module, the insulation resistance value of the low-voltage assemblies can be analyzed after obtaining the insulation resistance value of the low-voltage assemblies in a timely manner, the insulation state detection result of the low-voltage assemblies can be quickly determined, and the efficiency of the insulation detection result of the low-voltage assemblies can be improved.

[0014] In one embodiment, the step of determining the insulation state detection result of the low-voltage assembly based on the insulation resistance value of the low-voltage assembly is: A step of comparing the insulation resistance value of a low-voltage assembly with a predetermined insulation fault resistance value, The method includes the step of determining that if the insulation resistance value of the low-voltage assembly is less than the insulation fault resistance value, the insulation state detection result of the low-voltage assembly is that there is an insulation fault; otherwise, determining that the insulation state detection of the low-voltage assembly has passed.

[0015] In the technical solution of the embodiment of the present application, by comparing the insulation resistance value of the low-voltage assembly with a predetermined insulation fault resistance value, if the insulation resistance value of the low-voltage assembly is smaller than the insulation fault resistance value, the insulation state detection result of the low-voltage assembly is determined to be that there is an insulation fault; otherwise, the insulation state detection of the low-voltage assembly is determined to have passed. Based on the comparison result of the insulation resistance value of the low-voltage assembly with the predetermined insulation fault resistance value, the insulation state detection result of the low-voltage assembly can be accurately determined, and it can be accurately determined whether or not an insulation fault exists in the low-voltage assembly.

[0016] In one embodiment, the step of performing insulation state detection on each high-voltage assembly and the energy storage system by an insulation detection module in accordance with the high-voltage application timing of each high-voltage assembly among the assemblies under test is as follows: The steps include: performing insulation detection on each high-voltage assembly by executing an insulation detection operation after high voltage application on each high-voltage assembly according to the high voltage application timing of each high-voltage assembly; The procedure includes the step of performing an insulation state detection on the energy storage system once the application of high voltage to each high voltage assembly is complete and the insulation state detection of each high voltage assembly has passed.

[0017] In the technical solution of the embodiment of the present invention, in the process of applying high voltage to each high voltage assembly according to the high voltage application timing of each high voltage assembly, the high voltage application time for each high voltage assembly is short, and in the process of applying high voltage to each high voltage assembly multiple times, the time required for insulation detection of the high voltage assembly by the insulation detection module is also short. At the same time, the insulation resistance value corresponding to each high voltage assembly can be obtained by one insulation detection module. When the application of high voltage to any of the high voltage assemblies is completed and the insulation state detection of each high voltage assembly is passed, the insulation detection module can accurately perform insulation state detection on the energy storage system. This process allows for immediate detection of the insulation resistance value of each high voltage assembly by one insulation detection module, reduces the number of interactions in the detection process, and reduces the complexity of the high voltage assembly detection process.

[0018] In one embodiment, the step of performing an insulation detection operation after applying a high voltage to each high-voltage assembly is: The steps include: controlling the application of a high voltage to one of the high-voltage assemblies, and obtaining the insulation resistance value after the application of the high voltage to the high-voltage assembly is completed by an insulation detection module; The steps include determining the insulation state detection result of the high-voltage assembly based on the insulation resistance value after the application of high voltage to the high-voltage assembly is completed, The method includes, after obtaining the insulation state detection result of the high-voltage assembly, controlling the application of high voltage to the next high-voltage assembly according to the high-voltage application timing until the insulation state detection result of all high-voltage assemblies is obtained.

[0019] In the technical solution of the embodiment of the present application, the system controls the application of a high voltage to any one high voltage assembly, accurately obtains the insulation resistance value after the application of high voltage to the high voltage assembly by an insulation detection module, and accurately determines the insulation state detection result of the high voltage assembly based on the insulation resistance value after the application of high voltage to the high voltage assembly. If the insulation state detection of the high voltage assembly is successful, the system controls the application of high voltage to the next high voltage assembly according to the high voltage application timing until the insulation state detection results of all high voltage assemblies are obtained, and by repeatedly detecting the insulation state of each high voltage assembly multiple times, the detection process of the high voltage assemblies is made more standardized, the insulation state detection results of the high voltage assemblies are made more accurate, and at the same time, each high voltage assembly is detected immediately by a single insulation detection module, reducing detection costs, and reducing the number of interactions in the detection process and the complexity of the interactions.

[0020] In one embodiment, the step of controlling the application of a high voltage to a high voltage assembly is: The steps include sending a high-voltage application command to a high-voltage assembly, instructing the high-voltage assembly to turn off its internal relays in accordance with the high-voltage application command, and to complete the application of high voltage, The process includes receiving a high-voltage application completion command returned from the high-voltage assembly and determining that the application of high voltage to the high-voltage assembly has been completed.

[0021] In the technical solution of the embodiment of the present application, by sending a high-voltage application command to the high-voltage assembly, the high-voltage assembly turns off the internal relay according to the high-voltage application command and is instructed to complete the high-voltage application. After the high-voltage application to the high-voltage assembly is completed, the high-voltage application completion command returned from the high-voltage assembly is received. By sending a high-voltage command to each high-voltage assembly and receiving a high-voltage completion command, the high-voltage application can be performed more accurately according to the high-voltage application timing of the high-voltage assembly, avoiding the disorder of the order of the high-voltage application process of each high-voltage assembly. In the process of detecting the high-voltage assembly, it is not necessary to frequently turn on and off the insulation detection module, reducing the number of interactions in the detection process and reducing the complexity of the detection process of the high-voltage assembly.

[0022] In one embodiment, the step of determining the insulation state detection result of the high-voltage assembly based on the insulation resistance value after the high-voltage application to the high-voltage assembly is completed is as follows: Comparing the insulation resistance value of the high-voltage assembly with a predetermined insulation fault resistance value; When the insulation resistance value of the high-voltage assembly is smaller than the insulation fault resistance value, determining that the insulation state detection result of the high-voltage assembly is with insulation fault, and otherwise, determining that the insulation state detection of the high-voltage assembly is qualified.

[0023] In the technical solution of the embodiment of the present application, by comparing the insulation resistance value of the high-voltage assembly with a predetermined insulation fault resistance value, when the insulation resistance value of the high-voltage assembly is smaller than the insulation fault resistance value, it is determined that the insulation state detection result of the high-voltage assembly is with insulation fault, and otherwise, it is determined that the insulation state detection of the high-voltage assembly is qualified. Based on the comparison result of the insulation resistance value of the high-voltage assembly and the predetermined insulation fault resistance value, the insulation state detection result of the high-voltage assembly can be accurately determined, and whether there is an insulation fault in the high-voltage assembly can be accurately determined.

[0024] In one embodiment, the step of performing insulation state detection on the energy storage system is as follows: The steps include detecting the insulation resistance value of the energy storage system using an insulation detection module, The method includes the step of determining the insulation state detection result of the energy storage system based on the insulation resistance value of the energy storage system.

[0025] In the technical solution of the embodiment of the present invention, when detecting an energy storage system with an insulation detection module, it is necessary to specifically distinguish the energy storage system. By obtaining and detecting the insulation resistance value of the entire energy storage system with the insulation detection module, it is possible to quickly determine whether or not an insulation fault exists when the energy storage system is operating normally. At the same time, one insulation detection module can not only detect each assembly under test, but also detect the entire energy storage system, thereby reducing the hardware cost of insulation detection for the energy storage system.

[0026] In one embodiment, the step of determining the insulation state detection result of the energy storage system based on the insulation resistance value of the energy storage system is: A step of comparing the insulation resistance value of the energy storage system with a predetermined insulation fault resistance value, The process includes the step of determining that if the insulation resistance of the energy storage system is less than the insulation fault resistance, the insulation state detection result of the energy storage system is that there is an insulation fault; otherwise, determining that the insulation state detection of the energy storage system has passed.

[0027] In the technical solution of the embodiment of the present application, by comparing the insulation resistance value of the energy storage system with a predetermined insulation fault resistance value, if the insulation resistance value of the energy storage system is smaller than the insulation fault resistance value, the insulation state detection result of the energy storage system is determined to be that there is an insulation fault; otherwise, the insulation state detection of the energy storage system is determined to have passed. Based on the comparison result of the insulation resistance value of the energy storage system with the predetermined insulation fault resistance value, the insulation state detection result of the energy storage system can be accurately determined, and it can be accurately determined whether or not an insulation fault exists in the energy storage system.

[0028] In one embodiment, this method is If the insulation status detection of the energy storage system indicates an insulation fault, the step of issuing a high-voltage shutdown command to each high-voltage assembly and instructing each high-voltage assembly to perform a high-voltage shutdown, After the high-voltage interruption for each high-voltage assembly is completed, the step of determining the detection result of the insulation state inspection for each high-voltage assembly is performed on each high-voltage assembly by carrying out an insulation detection operation after applying high voltage to each high-voltage assembly. The further step includes determining which high-voltage assembly is causing an insulation failure in the energy storage system, based on the results of an insulation condition inspection of each high-voltage assembly.

[0029] In the technical solution of the embodiment of the present invention, if the insulation state detection of the energy storage system indicates the presence of an insulation fault, it indicates that the insulation fault exists in the process of the normal operation of the energy storage system, but it is not possible to determine which assembly under test in the energy storage system has the insulation fault. Therefore, a high-voltage cutoff command is issued to each high-voltage assembly, instructing each high-voltage assembly to perform a high-voltage cutoff. After the high-voltage cutoff for each high-voltage assembly is completed, it is ensured that each assembly under test is in a low-voltage state, and it is possible to determine whether or not an insulation fault exists in the low-voltage assembly. If no insulation fault is found in the low-voltage assembly, an insulation detection operation after applying high voltage is performed on each high-voltage assembly to obtain the insulation resistance value corresponding to each high-voltage assembly. Based on this insulation resistance value, each high-voltage assembly can be accurately inspected, and the detection result of the insulation state inspection of each high-voltage assembly can be determined. Based on the detection result of the insulation state inspection of each high-voltage assembly, the high-voltage assembly that causes the insulation fault in the energy storage system can be accurately identified, improving the accuracy of insulation state detection.

[0030] In one embodiment, before responding that the isolation detection module is in the ON state, this method... If it is detected that a low voltage has been applied to each assembly under test, the further step includes sending an isolation detection ON command to the isolation detection module to switch the isolation detection module to the ON state.

[0031] In the technical solution of the embodiment of the present invention, when it is detected that a low voltage has been applied to each assembly under test, an insulation detection ON command is sent to the insulation detection module in a timely manner, switching the insulation detection module to the ON state. The insulation detection module remains in the ON state at all times and does not automatically turn OFF, allowing for immediate detection of the insulation resistance value of each assembly under test throughout the entire process. This avoids multiple ON / OFF cycles of the insulation detection module, reduces the number of interactions in the detection process, and lowers the complexity of the interactions in the detection process.

[0032] In one embodiment, this method is The method further includes the step of outputting information to instruct any one of the assembled units to perform insulation fault inspection and maintenance if the insulation condition result of the assembled unit indicates an insulation fault.

[0033] In the technical solution of the embodiment of the present application, if the insulation condition result of any one of the assembled components under test indicates an insulation failure, information can be output to the technician in a timely manner, and the technician can perform timely inspection and maintenance of the assembled component for insulation failures in order to ensure the safe operation of the energy storage system.

[0034] In a second embodiment, the present invention relates to an insulation state detection system comprising a plurality of assemblies under test and one insulation detection module, wherein the plurality of assemblies under test and the insulation detection module are all communicably connected to an energy management system, and each assembly under test and the insulation detection module is connected in parallel to the same DC bus in an energy storage system. The energy management system further provides an insulation state detection system used to sequentially perform insulation state detection on each assembly under test and the energy storage system by the insulation state detection module in response to the insulation state detection module being ON, according to the voltage application and voltage cutoff timing of each assembly under test.

[0035] In the technical solution of the embodiment of the present invention, the energy management system is communicatively connected to multiple assemblies under test and one insulation detection module, and simultaneously, each assembly under test and the insulation detection module are connected in parallel to the same DC bus. With this implementation configuration, the circuit connection relationship is simplified, and in the insulation state detection process, the insulation state of multiple assemblies under test and energy storage systems can be detected by only one insulation detection module, thereby reducing the hardware cost input in the insulation state detection process. Furthermore, when performing insulation state detection on each assembly under test and energy storage system, it is performed in accordance with the voltage application and voltage cutoff timing of each assembly under test. In this way, based on a simple circuit connection configuration, it is possible to sequentially perform insulation state detection on each assembly under test and energy storage system at set voltage application and voltage cutoff timings, thereby reducing interaction in the detection process, simplifying the insulation fault detection process for each assembly under test and energy storage system, and reducing the complexity of the insulation fault detection process for energy storage systems.

[0036] In a third embodiment, the present application further provides an energy storage system including an insulation state detection system according to the second embodiment described above.

[0037] In the technical solution of the embodiment of the present invention, the energy management system is communicatively connected to multiple assemblies under test and one insulation detection module, and simultaneously, each assembly under test and the insulation detection module are connected in parallel to the same DC bus. With this implementation configuration, the circuit connection relationship is simplified, and in the insulation state detection process, the insulation state of multiple assemblies under test and energy storage systems can be detected by only one insulation detection module, thereby reducing the hardware cost input in the insulation state detection process. Furthermore, when performing insulation state detection on each assembly under test and energy storage system, it is performed in accordance with the voltage application and voltage cutoff timing of each assembly under test. In this way, based on a simple circuit connection configuration, it is possible to sequentially perform insulation state detection on each assembly under test and energy storage system at set voltage application and voltage cutoff timings, thereby reducing interaction in the detection process, simplifying the insulation fault detection process for each assembly under test and energy storage system, and reducing the complexity of the insulation fault detection process for energy storage systems.

[0038] In the fourth embodiment, the present application is provided for, The present invention further provides an insulation state detection device, which includes a detection module for sequentially detecting the insulation state of each assembly under test and an energy storage system in accordance with the voltage application and voltage cutoff timing of each assembly under test, in response to the insulation detection module being in the ON state.

[0039] In a fifth embodiment, the present invention further provides a computer-readable storage medium that stores a computer program which, when executed by a processor, implements the insulation state detection method described in any one of the first embodiments.

[0040] In a sixth embodiment, the present invention further provides a computer program product which includes a computer program that, when executed by a processor, implements the isolation state detection method described in any one of the first embodiments.

[0041] The above description is merely an overview of the technical solution of the present application. In order to better understand the technical means of the present application, and to make the above and other objectives, features, and benefits of the present application clearer and easier to understand, specific embodiments of the present application are given below, which can be implemented according to the contents of the specification. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings necessary for use in the embodiments of this application will be briefly described below. However, obviously, the drawings described below represent only a few embodiments of this application, and those skilled in the art can obtain further drawings based on these drawings without any creative effort. [Brief explanation of the drawing]

[0042] [Figure 1] This is a schematic diagram of the architecture of a conventional energy storage system in one embodiment. [Figure 2] This is a schematic diagram of the architecture of the energy storage system of the present invention in one embodiment. [Figure 3] This is a flowchart of the insulation state detection method in one embodiment. [Figure 4] This is a flowchart of the insulation state detection method in one embodiment. [Figure 5] This is a flowchart of the insulation state detection method in one embodiment. [Figure 6] This is a flowchart of the insulation state detection method in one embodiment. [Figure 7] This is a flowchart of the insulation state detection method in one embodiment. [Figure 8] This is a flowchart of the insulation state detection method in one embodiment. [Figure 9] This is a flowchart of the insulation state detection method in one embodiment. [Figure 10] This is a flowchart of the insulation state detection method in one embodiment. [Figure 11] This is a flowchart of the insulation state detection method in one embodiment. [Figure 12]This is a flowchart of the insulation state detection method in one embodiment. [Figure 13] This is a flowchart of the insulation state detection method in one embodiment. [Figure 14] This is a flowchart of the insulation state detection method in one embodiment. [Figure 15] This is a flowchart of the insulation state detection method in one embodiment. [Figure 16] This is a schematic diagram of the architecture of an energy storage system in one embodiment. [Figure 17] This is a diagram showing the internal structure of a computer device in one embodiment. [Modes for carrying out the invention]

[0043] The following examples of embodiments of the technical solution of this application will be described in detail with reference to the drawings. The following embodiments are merely for the purpose of clarifying the technical solution of this application and should not be used as examples to limit the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art. Terms used herein are for illustrative purposes only and are not intended to limit this application. The “inclusions” and any variations thereof in the description of the specification, claims, and drawings are intended to cover non-exclusive “inclusions.”

[0045] Where the “Examples” are referred to herein, it means that certain features, structures, or properties described in conjunction with the Examples may be included in at least one Example of the Application. The use of this term in each part of the Specification does not necessarily refer to the same Example, nor do they constitute separate or alternative Examples that are mutually exclusive with each other. Those skilled in the art will understand, both expressly and implicitly, that the Examples described herein can be combined with other Examples.

[0046] With the continuous development of new energy technologies, various types of energy storage systems are increasingly being applied to various fields, and these systems can provide electrical energy to users during peak power consumption or during power outages. For example, energy storage systems can include solar power energy storage systems, wind power energy storage systems, hydropower energy storage systems, and battery energy storage systems.

[0047] However, energy storage systems can experience various types of failures during use. For example, failure types can include thermal failures, electrical failures, and mechanical failures. Among electrical failures, insulation failures can cause safety accidents such as fires and explosions. To ensure the safe operation of an energy storage system, insulation detection must be performed on the equipment inside the energy storage system to determine whether or not an insulation failure exists in the equipment inside the energy storage system. This prevents the occurrence of safety accidents and ensures the safe operation of the energy storage system.

[0048] Figure 1 is a schematic diagram of the architecture of a conventional energy storage system. In Figure 1, the energy storage system 11 includes multiple branches, each branch containing one energy storage inverter 111 (Power Conversion System, PCS) and a battery management system 112 (BMS). The energy storage inverter 111 is connected to the battery management system 112, and all PCS in the branches are connected to the power grid 12, and all BMSs are connected to an energy management system 13 (Energy Management System, EMS). To perform isolation detection on the BMS in each branch within the energy storage system 11, multiple isolation detection modules 14 are connected to each branch circuit. In this way, each isolation detection module 14 can perform isolation detection on the branch circuit to determine whether or not an isolation fault exists in that branch circuit.

[0049] Research conducted by the applicant has shown that in related technologies, when multiple isolation detection modules 14 detect simultaneously, mutual interference exists, requiring polling of the on / off states of multiple isolation detection modules 14. That is, each time detection occurs, one isolation detection module 14 in one branch circuit is turned on, and isolation detection modules 14 in other branch circuits are turned off. In such cases, the isolation detection module 14 in each branch circuit is turned on when detection occurs and turned off after detection is complete. The EMS needs to control the on / off states of multiple isolation detection modules 14 simultaneously, and it has been found that the interaction between multiple isolation detection modules 14 and the EMS during the detection process is highly complex.

[0050] Based on this consideration, the applicant has studied the insulation detection method provided by the embodiments of the present application and found that by providing one insulation detection module in the energy storage system, and controlling the EMS to keep this one insulation detection module always ON and to turn it OFF after detection is complete, the complexity of the interaction between multiple insulation detection modules and the EMS can be greatly reduced. In order to detect assemblies such as PCS and BMS in the energy storage system with only one insulation detection module, the applicant has connected the insulation detection module and all assemblies such as PCS and BMS in the energy storage system in parallel to the same DC bus, and divided the detection time for each assembly, i.e., allowing assemblies such as PCS and BMS in the energy storage system to operate independently at different time intervals, thereby enabling detection of different assemblies with one insulation detection module. This process reduces interaction in the detection process, simplifies the insulation fault detection process, and reduces the complexity of the insulation fault detection process in the energy storage system.

[0051] In several exemplary embodiments, the applicant has studied that in the prior art energy storage system 11, each branch circuit corresponds to one isolation detection module 14. In the case of an energy storage system 11 with few branch circuits, the number of isolation detection modules 14 is also small, and the cost is relatively low. However, when the energy storage system 11 has multiple branch circuits, the number of corresponding isolation detection modules 14 is large, thus leading to the problem of high hardware costs for isolation detection in the energy storage system 11.

[0052] Based on this consideration, the applicant has studied the insulation detection method provided by the embodiment of the present application and found that by connecting one insulation detection module in parallel to the DC bus, the number of insulation detection modules can be reduced, and each assembly connected in parallel to the same DC bus can be detected by one insulation detection module, significantly reducing the number of insulation detection modules used and lowering the hardware cost investment in the insulation state detection process.

[0053] The technical effects that can be achieved by the insulation state detection method and energy storage system provided by the embodiments of the present invention are not limited to those stated herein, and other technical effects can also be achieved. For example, since the insulation detection module and assemblies such as PCS and BMS in the energy storage system are both connected in parallel to the same DC bus, the circuit connection relationships within the energy storage system are simplified, and the insulation detection needs of such energy storage systems can be better met even for energy storage systems with complex internal connection relationships.

[0054] The insulation state detection method provided by the embodiments of the present application is applied to an energy storage system 11. Based on this, before describing the insulation state detection method provided by the embodiments of the present application, we will first describe the architecture of the energy storage system to which the embodiments of the present application apply.

[0055] As shown in Figure 2, Figure 2 is a schematic diagram of the architecture of an energy storage system provided by an embodiment of the present invention, and the multiple assemblies under test in the energy storage system 21 may include an electrical cabinet 211, a photovoltaic panel controller 212 (Maximum Power Point Tracking, MPPT), an energy storage inverter 213, etc., and the electrical cabinet 211 may include a battery management system 2111 and a DC chopper 2112 (Direct Current / Direct Current, DC / DC). The battery management system 2111 is connected to the DC chopper 2112, and the isolation detection module 22, DC chopper 2112, photovoltaic panel controller 212, and energy storage inverter 213 are each connected in parallel to the same DC busbar, and the energy storage inverter 213 is connected to the power grid 12 and the DC busbar, respectively, and is used to convert the AC current provided by the power grid 12 into DC current and to provide electrical energy to the electrical cabinet 211 and the photovoltaic panel controller 212.

[0056] The energy management system 13 communicates with the insulation detection module 22 and the multiple assemblies under test, and this communication method may be any one of the following: CAN bus, Canbus communication, Modbus communication, RS485 communication, RS232 communication, or RS422 communication. The energy management system may also be an insulation detection management module based on a computer that has the function of collecting insulation data of each assembly in the energy storage system, analyzing the insulation data, and responding to control processing.

[0057] Simultaneously, the insulation detection module 22 and each of the assemblies under test are connected in parallel to the same DC bus. The present invention does not limit the parallel connection positions of the multiple assemblies under test and the insulation detection module 22 on the DC bus. For example, the insulation detection module 22 may be provided at both ends of the DC bus, and the multiple assemblies under test may be provided at the center. Alternatively, the insulation detection module 22 may be provided at the center, and the multiple assemblies under test may be provided at both sides.

[0058] The insulation detection module 22 described above is used to acquire insulation parameter values ​​for each assembly under test, and these insulation parameter values ​​are used to characterize the insulation state of each assembly under test. For example, these insulation parameters may include leakage current values ​​and insulation resistance values ​​for each assembly under test. The energy management system can send an insulation detection ON command to the insulation detection module to control it to turn on detection by the insulation detection module. After the insulation detection module is turned on, it remains in the ON state at all times, eliminating the need for frequent switching during the detection process. This allows for immediate detection of the insulation parameter values ​​of the energy storage system and each assembly under test, and the acquired insulation parameters of each assembly under test can be transmitted to the energy management system 13. After acquiring the insulation parameters of each assembly under test, the energy management system 13 can perform insulation state detection on each assembly under test based on the insulation parameters of each assembly under test. After the energy management system has completed detecting the insulation status of the energy storage system and each assembly under test, the energy management system sends an insulation detection off command to the insulation detection module. Upon receiving the insulation detection off command, the insulation detection module turns off detection of the insulation parameter values ​​for the energy storage system and each assembly under test. The insulation detection module 22 may be a pointer-type insulation resistance meter or a digital insulation resistance meter.

[0059] The energy storage inverter 213 is used to acquire electrical energy from or release electrical energy to the power grid. The energy storage inverter 213 includes an inverter 2131 (Direct Current / Alternating Current, DC / AC) and a control unit 2132. The inverter 2131 is used to convert direct current supplied by the power grid into alternating current, and the control unit 2132 is used to receive control commands transmitted by the energy management system 13 and to charge or discharge the photovoltaic panel controller 212 or battery management unit 2111 inside the energy storage system 21 according to the control commands, thereby regulating the active and reactive power of the power grid.

[0060] In several exemplary embodiments, the connection relationships between each assembly within the energy storage system can be modified as described above, allowing each assembly to be detected by a single isolation detection module. The energy management system 13 interacts with this single isolation detection module, avoiding interaction between the energy management system 13 and multiple isolation detection modules, reducing the complexity of the interaction process, and simultaneously significantly reducing the hardware cost of isolation detection by using a single isolation detection module.

[0061] The designs of the structures within the energy storage systems in the above embodiments are merely examples for realizing the technical effects of the present invention, and may be adaptively modified to achieve easily conceivable technical effects when actually applied. It is understood that the embodiments of the present invention do not limit their structure.

[0062] Next, the insulation state detection method provided by the embodiments of the present application will be described. The insulation state detection method in the embodiments of the present application is an energy storage system applicable to Figure 2 above, and all will be described with the energy management system 13 as the implementing entity.

[0063] In one embodiment, as shown in Figure 3, this embodiment includes the following step S101.

[0064] In S101, in response to the insulation detection module being in the ON state, the insulation detection module sequentially performs insulation state detection on each assembly under test and the energy storage system according to the voltage application and voltage cutoff timing of each assembly under test.

[0065] During operation of an energy storage system, fault detection must be performed on the energy storage system according to a predetermined detection cycle to ensure that the energy storage system operates safely and stably. Before insulation state detection is performed on the energy storage system and the components under test within the energy storage system, the insulation detection module is in the off state. The energy management system must send an insulation detection ON command to the insulation detection module, and after receiving this command, the insulation detection module turns on detection for the insulation parameter values ​​of the energy storage system and each component under test.

[0066] When the insulation detection module is ON, the energy management system controls the application and disconnection of voltage to each assembly under test. During the voltage application and disconnection process, the insulation detection module detects the insulation parameter value of each assembly under test and transmits the corresponding insulation parameter value to the energy management system. The energy management system then determines the insulation status of each assembly under test and the energy storage system based on the corresponding insulation parameter value. The insulation status includes insulation failure and normal insulation. Taking assembly A as an example, if the insulation status detection for assembly A passes, it indicates that there is no insulation failure in assembly A, the insulation parameter value of the assembly under test is greater than a predetermined resistance value, or the insulation parameter value of the assembly under test is the same as the rated resistance value, thus protecting the assembly under test and ensuring the safety of the energy storage system. If the insulation condition detection of assembly A fails, it indicates that an insulation fault exists in assembly A. The insulation parameter value of the assembly is lower than the predetermined resistance value, the assembly cannot be protected, and the insulation fault could cause safety accidents such as ignition or explosion of the energy storage system.

[0067] Voltage application / cutoff timing refers to the sequence in which voltage is applied to and cut off to each test assembly in an energy storage system. If high or low voltage is not considered during voltage application and cutoff, the energy management system may generally first control the system to apply voltage to each test assembly in the energy storage system according to a predetermined voltage application sequence, and may also control the system to apply voltage to each test assembly simultaneously. After the voltage application to each test assembly is complete, the system may control the system to cut off voltage to each test assembly according to a predetermined voltage cutoff sequence, and may also control the system to cut off high voltage to each test assembly simultaneously.

[0068] Considering the high or low voltages applied and cut off, each assembly under test can be divided into a low-voltage assembly and a high-voltage assembly. The energy management system can first control the low-voltage assembly to apply a low voltage, and if it is determined that there are no insulation faults in the low-voltage assembly, it can further control the high-voltage assembly to apply a high voltage according to a predetermined high-voltage application sequence, or to apply a high voltage to the high-voltage assembly simultaneously. If there are no insulation faults in the high-voltage assembly, it can determine whether an insulation fault exists when the energy storage system is operating normally. If there is no fault, there is no need to cut off the high voltage. If there is a fault, it can control the high-voltage assembly to cut off the high voltage according to the high-voltage cutting off sequence, or to cut off the high voltage to the high-voltage assembly simultaneously. Furthermore, in accordance with the above voltage application operations, it can sequentially inspect which assembly under test has an insulation fault when the energy storage system is operating normally. For example, a low-voltage assembly may include a solar panel controller, DC-side equipment of a PCS, etc., and a high-voltage assembly may include a BMS in an electrical cabinet, DC / DC in an electrical cabinet, and AC-side equipment of a PCS, etc.

[0069] In the process in which the insulation detection module detects each assembly under test according to the voltage application and voltage interruption timing, it is understood that the insulation parameter value obtained each time a detection occurs may represent the insulation parameter value of a particular assembly under test, the insulation parameter values ​​of several assemblies under test, or the insulation parameter value of the entire energy storage system. For example, in the process of applying a low voltage to each assembly under test, the insulation parameter value detected by the insulation detection module includes the common insulation parameter value of the DC-side equipment of the solar panel controller and the PCS, while in the process of applying a high voltage to the PCS, the insulation parameter value detected by the insulation detection module refers to the insulation parameter value of the AC-side equipment of the PCS.

[0070] In the above insulation state detection method, the energy management system is communicatively connected to multiple assemblies under test and one insulation detection module. Simultaneously, each assembly under test and the insulation detection module are connected in parallel to the same DC bus. This implementation simplifies the circuit connection relationship, and in the insulation state detection process, only one insulation detection module can detect the insulation state of multiple assemblies under test and energy storage systems. This reduces the hardware cost input in the insulation state detection process. Furthermore, when performing insulation state detection on each assembly under test and energy storage system, it is performed in accordance with the voltage application and voltage cutoff timing of each assembly under test. Thus, based on a simple circuit connection configuration, it is possible to sequentially perform insulation state detection on each assembly under test and energy storage system at set voltage application and voltage cutoff timings, reducing interaction in the detection process, simplifying the insulation fault detection process for each assembly under test and energy storage system, and reducing the complexity of the insulation fault detection process for energy storage systems.

[0071] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S101 in the embodiment shown in Figure 3, which involves "the insulation detection module sequentially detecting the insulation state of each assembly under test and the energy storage system according to the voltage application and voltage cutoff timing of each assembly under test." As shown in Figure 4, the insulation state detection process may include the following:

[0072] In S201, the low-voltage application state of each test assembly and the high-voltage application timing of the high-voltage assembly among the test assemblies are acquired.

[0073] High voltage and low voltage are defined based on the voltage to ground. The boundary between high voltage and low voltage is an AC voltage of 1000 volts (V) or a DC voltage of 1500V. Assemblys with an AC voltage less than 1000V or a DC voltage less than 1500V are considered low voltage assemblies, while those with an AC voltage of 1000V or more or a DC voltage of 1500V or more are considered high voltage assemblies. For example, among the assemblies under test in an energy storage system, low voltage assemblies may include a solar panel controller and DC-side equipment of a PCS, while high voltage assemblies may include an electrical cabinet, a BMS in an electrical cabinet, a DC / DC converter in an electrical cabinet, and AC-side equipment of a PCS.

[0074] The low-voltage application state indicates that each assembly under test is in a low-voltage applied state, and in the low-voltage application state, the insulation detection module can detect the insulation parameter value of the low-voltage assembly among the assemblies under test. The high-voltage application timing refers to the sequence in which high voltage is applied to the high-voltage assemblies. For example, the high-voltage application timing may be BMS, DC / DC, DC / AC, that is, the energy management system first controls to apply high voltage to the BMS, then controls to apply high voltage to the DC / DC after the high-voltage application to the DC / DC is complete, indicating that the high-voltage application operation to the entire electrical cabinet has already been completed, and finally controls to apply high voltage to the DC / AC, indicating that the high-voltage application to the entire energy storage system has already been completed after the high-voltage application to the DC / AC is complete.

[0075] When applying a low voltage to each assembly under test, in some exemplary embodiments, the DC bus can be charged by discharging the MPPT, thereby providing a low voltage to each assembly under test. In some exemplary embodiments, if no voltage is stored in the MPPT, voltage may be obtained from the power grid via DC / AC, charging the DC bus and providing a low voltage to each assembly under test. The process of each assembly under test performing a low voltage operation is performed spontaneously, rather than being controlled by the energy management system.

[0076] In this embodiment, during the process of applying a low voltage to each assembly under test, the insulation detection module can detect the insulation parameter value of the low-voltage assembly among the assemblies under test and transmit the insulation parameter value to the energy management system. After receiving the insulation parameter value, the energy management system determines whether or not each assembly under test is in a low-voltage applied state.

[0077] In some exemplary embodiments, the energy management system can determine the past high-voltage timing of a high-voltage assembly as the high-voltage application timing of the high-voltage assembly. In some exemplary embodiments, the energy management system can sequence the high-voltage assemblies according to the number of past insulation failures of each high-voltage assembly, obtain a sequencing result for the high-voltage assemblies, and determine this sequencing result as the voltage application timing of the high-voltage assemblies. This embodiment does not limit the form in which the high-voltage application timing of the high-voltage assembly is obtained.

[0078] In S202, the insulation detection module sequentially performs insulation state detection on each assembly under test and the energy storage system, depending on the low voltage application state of each assembly under test and the high voltage application timing of the high voltage assembly among the assemblies under test.

[0079] In the process of applying a low voltage to each assembly under test, the insulation detection module can immediately acquire the insulation parameter values ​​of each assembly under test. In this case, the insulation detection module detects the insulation parameter values ​​of the low-voltage assembly and the common insulation parameter values ​​of the DC bus among the assemblies under test. Based on these insulation parameter values, the insulation state of the low-voltage assembly and the DC bus can be determined, that is, whether or not a fault exists in the low-voltage assembly and the DC bus. If a fault exists, it can be determined that a fault exists in the low-voltage assembly and the DC bus, but it cannot be determined specifically whether the fault is in the low-voltage assembly or the DC bus, nor can it be determined which low-voltage assembly has the fault. Subsequently, a technician needs to inspect the low-voltage assembly and the DC bus separately to determine the specific faulty assembly. In some exemplary embodiments, because the resistance value of the DC bus is small, it is possible to ignore the DC bus and directly determine whether or not a fault exists in the low-voltage assembly.

[0080] In this embodiment, the energy management system can determine whether each assembly under test is in a low-voltage applied state based on the insulation parameter values ​​of each assembly under test collected by the insulation detection module. If it determines that the application of low voltage to each assembly under test is complete, it determines whether the insulation state detection of the low-voltage assembly has passed. If it passes, it indicates that there is no insulation fault in the low-voltage assembly, and the energy management system controls the application of high voltage to the high-voltage assembly. If it fails, it indicates that there is an insulation fault in the low-voltage assembly, and the energy management system feeds the insulation fault information back to the technician, who can then perform a fault inspection on the low-voltage assembly based on the insulation fault information.

[0081] After low voltage application to each assembly under test is completed, and after it is determined that there are no faults in either the low-voltage assembly or the DC busbar, the high-voltage application operation is then performed on the high-voltage assemblies in order according to the high-voltage application timing of each high-voltage assembly. The energy management system then performs the high-voltage application operation on each high-voltage assembly among the assemblies under test in order according to the high-voltage application timing of each high-voltage assembly, and determines whether the insulation state detection of each high-voltage assembly has passed, that is, whether there is a fault in each high-voltage assembly. If it is determined that there are no faults in either the low-voltage or high-voltage assembly among the assemblies under test, the energy storage system is in a state of normal operation. Furthermore, the insulation detection module obtains the insulation parameter value of the entire energy storage system and transmits the insulation parameter value of the energy storage system to the energy management system. Based on the insulation parameter value of the energy storage system, the energy management system determines the insulation state during the normal operation of the energy storage system and detects whether the insulation state detection of the energy storage system has passed, thereby determining whether there is a fault during the normal operation of the energy storage system.

[0082] In the above insulation state detection method, the voltage application and cutoff timings for each assembly under test are divided into low-voltage application state and high-voltage application timing for each assembly under test. In this way, when the insulation detection module performs insulation state detection on each assembly under test and the energy storage system, the detection logic can be further subdivided to instruct the detection logic based on the low-voltage application state of each assembly under test and the high-voltage application timing of the high-voltage assembly among the assemblies under test. The voltage application timing of the energy storage system itself involves first applying a low voltage and then applying a high voltage. This corresponds to setting the voltage application and cutoff timings according to the voltage application needs of the assemblies themselves in the energy storage system, thereby providing higher reliability when performing insulation state detection on each assembly under test and the energy storage system. In several exemplary embodiments, the high-voltage application timing is the timing for the high-voltage assembly, and high voltage is applied to the high-voltage assembly in a specific order, enabling the insulation detection module to sequentially detect the insulation state of the high-voltage assembly. This reduces the number of interactions in the insulation state detection of the high-voltage assembly, not only lowering the complexity of the insulation state detection of the high-voltage assembly, but also significantly shortening the time required to perform insulation state detection on the high-voltage assembly, thereby improving the efficiency of insulation state detection.

[0083] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S202 in the embodiment of Figure 4, which states that "the insulation detection module sequentially performs insulation state detection on each assembly under test and the energy storage system according to the low voltage application state of each assembly under test and the high voltage application timing of the high voltage assembly among the assemblies under test." As shown in Figure 5, step S202 may include the following steps S301 to S302.

[0084] In S301, after applying a low voltage to each assembly under test, the insulation detection module performs insulation state detection on the low-voltage assembly among the assemblies under test.

[0085] In this embodiment, when a low voltage is supplied to a DC busbar by an MPPT or power grid, the insulation detection module acquires the insulation parameter value of each assembly under test and transmits the acquired insulation parameter value to the energy management system. Based on the insulation parameter value, the energy management system can determine whether or not each assembly under test is in a low voltage applied state. After determining that each assembly under test is in a low voltage applied state, the energy management system can further determine the insulation state of the low voltage assembly based on the insulation parameter value. For example, if the insulation parameter value is within a predetermined resistance range, the insulation state detection of the low voltage assembly is deemed successful, meaning that there is no fault in the low voltage assembly. If the insulation parameter value is outside the predetermined resistance range, the insulation state detection of the low voltage assembly is deemed unsuccessful, meaning that there is a fault in the low voltage assembly.

[0086] In S302, if the insulation state detection of the low-voltage assembly is successful, the insulation detection module performs insulation state detection on each high-voltage assembly and the energy storage system according to the high-voltage application timing of each high-voltage assembly among the assemblies under test.

[0087] If the insulation condition detection of the low-voltage assembly passes and it is determined that there are no insulation faults in the low-voltage assembly, the energy management system must perform insulation condition detection on each high-voltage assembly among the assemblies under test in order to determine whether or not there are insulation faults in the high-voltage assembly.

[0088] In this embodiment, when the energy management system controls each high-voltage assembly to apply a high voltage to it, the insulation detection module can acquire the insulation parameter value of the high-voltage assembly and transmit it to the energy management system. After receiving the insulation parameter value, the energy management system performs insulation state detection on the high-voltage assembly. In this way, insulation state detection can be performed on each high-voltage assembly. The detection process of the insulation detection module detects the common insulation parameter value of the high-voltage assembly and the DC busbar. Based on this insulation parameter value, the insulation state of the high-voltage assembly and the DC busbar is determined, i.e., high It is possible to determine whether or not faults exist in the voltage assembly and the DC bus. In some exemplary embodiments, the resistance of the DC bus is small, so the DC bus can be ignored, and it is possible to directly determine whether or not faults exist in the high-voltage assembly.

[0089] In the process of performing insulation status detection on each high-voltage assembly, it is understood that if the insulation status detection of one or more high-voltage assemblies fails, it indicates the presence of an insulation fault in the corresponding high-voltage assembly. To detect the insulation status of all high-voltage assemblies, it is necessary to determine whether an insulation fault exists in all high-voltage assemblies and specifically which high-voltage assemblies have an insulation fault by controlling the system to perform insulation status detection on the current high-voltage assembly regardless of whether a faulty high-voltage assembly existed before it.

[0090] In several exemplary embodiments, if the high-voltage application operation is completed for any of the high-voltage assemblies of each assembly under test, and no faults exist in any of the high-voltage assemblies of each assembly under test, the energy storage system is in a normal operating state. In this case, the insulation detection module can acquire the insulation parameter values ​​for the entire energy storage system and transmit these insulation parameter values ​​to the energy management system. Based on these insulation parameter values, the energy management system can determine the insulation state of the energy storage system and determine whether or not there are faults in the assembly under test within the energy storage system in its normal operating state.

[0091] In the above insulation state detection method, after applying a low voltage to each assembly under test, the insulation detection module can perform insulation state detection on the low-voltage assembly among the assemblies under test. If the insulation state detection of the low-voltage assembly is successful, the insulation detection module performs insulation state detection on each high-voltage assembly and the energy storage system according to the high-voltage application timing of each high-voltage assembly among the assemblies under test. In this invention, the voltage application process is divided into low-voltage application and high-voltage application, and each assembly under test is also divided accordingly into a low-voltage assembly and a high-voltage assembly. During the low-voltage application and high-voltage application processes, the insulation detection module sequentially performs insulation state detection on the low-voltage assembly and the high-voltage assembly, and the insulation state detection results for the entire low-voltage assembly and the entire high-voltage assembly of each assembly under test can be determined. In some exemplary embodiments, the insulation detection module further performs insulation state detection on multiple high-voltage assemblies of each assembly under test according to the high-voltage application timing of the high-voltage assembly, thereby reducing the number of interactions in the low-voltage application and high-voltage application detection processes for each assembly under test, and further reducing the complexity of the detection process for each assembly under test.

[0092] Based on the above embodiment, this embodiment will explain the specific details of step S301 in the embodiment shown in Figure 5, which involves "performing insulation state detection on the low-voltage assembly among the assemblies under test using the insulation detection module." As shown in Figure 6, step S301 may include the following:

[0093] In S401, the insulation resistance value of the low-voltage assembly detected by the insulation detection module is obtained.

[0094] The insulation resistance value of a low-voltage assembly refers to its DC resistance value under low-voltage application conditions.

[0095] In this embodiment, the low-voltage assembly among the assemblies under test in the energy storage system may include MPPT and PCS DC-side equipment. When a low-voltage application operation is performed on each assembly under test, the insulation resistance value detected by the insulation detection module refers to the common insulation resistance value of the MPPT and PCS DC side. The insulation detection module transmits the detected insulation resistance value to the energy management system, which can then obtain the insulation resistance value of the low-voltage assembly.

[0096] In S402, the insulation state detection result of the low-voltage assembly is determined based on the insulation resistance value of the low-voltage assembly.

[0097] In several exemplary embodiments, the energy management system can determine whether the insulation resistance value of a low-voltage assembly is within a predetermined range. If the insulation resistance value is within the predetermined range, the insulation state detection result of the low-voltage assembly is deemed to be successful, i.e., no fault is found in the low-voltage assembly. If the insulation resistance value is not within the predetermined range, the insulation state detection result of the low-voltage assembly is deemed to be unsuccessful, i.e., a fault is found in the low-voltage assembly. In several exemplary embodiments, the energy management system compares the insulation resistance value of the low-voltage assembly with a predetermined resistance value and determines the insulation state detection result of the low-voltage assembly based on the comparison result. In several exemplary embodiments, the energy management system can calculate an error value between the insulation resistance value of the low-voltage assembly and a predetermined resistance value, and determine the insulation state detection result of the low-voltage assembly based on this error value and the predetermined error value. This embodiment does not limit the form in which the insulation state detection result is determined based on the insulation resistance value of the low-voltage assembly.

[0098] In the above insulation state detection method, the insulation detection module does not need to specifically distinguish between low-voltage assemblies when detecting them. The insulation detection module can quickly detect the insulation resistance values ​​of all low-voltage assemblies, and after obtaining the insulation resistance values ​​of the low-voltage assemblies in a timely manner, it can analyze the insulation resistance values ​​of the low-voltage assemblies, quickly determine the insulation state detection results of the low-voltage assemblies, and improve the efficiency of the insulation detection results of the low-voltage assemblies.

[0099] In several exemplary embodiments, this embodiment will describe the specific details of step S402 in the embodiment of Figure 6, which involves "determining the insulation state detection result of the low-voltage assembly based on the insulation resistance value of the low-voltage assembly." As shown in Figure 7, step S402 may include the following:

[0100] In S501, the insulation resistance value of the low-voltage assembly is compared with a predetermined insulation fault resistance value.

[0101] In this embodiment, a predetermined insulation fault resistance value may be determined based on a large amount of past insulation fault data, or based on the actual operating attributes of the energy storage system, and this predetermined insulation fault resistance value is stored in the energy management system's database. The predetermined insulation fault resistance value is a boundary line; an insulation resistance value on one side of the insulation fault resistance value is a normal resistance value, indicating that the low-voltage assembly is operating normally, while an insulation resistance value on the other side of the insulation fault resistance value is an abnormal resistance value, indicating that an insulation fault exists in the low-voltage assembly. After obtaining the insulation resistance value of the low-voltage assembly, the energy management system compares this insulation resistance value with the predetermined insulation fault resistance value to determine whether or not an insulation fault exists in the low-voltage assembly.

[0102] In S502, if the insulation resistance value of the low-voltage assembly is less than the insulation fault resistance value, the insulation state detection result of the low-voltage assembly is determined to be that there is an insulation fault; otherwise, the insulation state detection of the low-voltage assembly is determined to be successful.

[0103] In this embodiment, it is shown that the higher the insulation resistance value of a low-voltage assembly, the higher the insulation effect of that low-voltage assembly, and conversely, the lower the insulation resistance value of a low-voltage assembly, the poorer the insulation effect of that low-voltage assembly. When the insulation resistance value of a low-voltage assembly is lower than the insulation fault resistance value, it indicates that an insulation fault exists in some or all of the low-voltage assembly. However, based on the insulation resistance value and insulation fault resistance value of the low-voltage assembly, it is not possible to determine specifically which assembly among the low-voltage assemblies has a fault. In this case, it is necessary for a technician to inspect all low-voltage assemblies and determine the specific low-voltage assembly that has a fault. When the insulation resistance value of a low-voltage assembly is greater than or equal to the insulation fault resistance value, that is, when the insulation state detection of the low-voltage assembly passes, it indicates that there are no insulation faults in any of the low-voltage assemblies and that the low-voltage assemblies can operate normally.

[0104] In the above insulation state detection method, by comparing the insulation resistance value of the low-voltage assembly with a predetermined insulation fault resistance value, if the insulation resistance value of the low-voltage assembly is smaller than the insulation fault resistance value, the insulation state detection result of the low-voltage assembly is determined to be that there is an insulation fault. Otherwise, the insulation state detection of the low-voltage assembly is determined to be successful. Based on the comparison result between the insulation resistance value of the low-voltage assembly and the predetermined insulation fault resistance value, the insulation state detection result of the low-voltage assembly can be accurately determined, and it can be accurately determined whether or not an insulation fault exists in the low-voltage assembly.

[0105] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S302 in the embodiment of Figure 5, which is "In accordance with the high voltage application timing of each high voltage assembly among the assemblies under test, the insulation detection module performs insulation state detection on each high voltage assembly and the energy storage system." As shown in Figure 8, step S302 may include the following:

[0106] In S601, insulation status detection is performed on each high-voltage assembly by executing an insulation detection operation after high voltage application to each high-voltage assembly according to the high voltage application timing of each high-voltage assembly.

[0107] In this embodiment, the energy management system can apply high voltage to each high voltage assembly according to the high voltage application timing. When applying high voltage to each high voltage assembly, the insulation detection module can detect the insulation parameter value after the high voltage application to each high voltage assembly and transmit the insulation parameter value of the high voltage assembly to the energy management system. Based on the insulation parameter value, the energy management system can determine whether the insulation state of each high voltage assembly is satisfactory. For example, if the high voltage application timing for each high voltage assembly is to the BMS in the electrical cabinet, the DC / DC in the electrical cabinet, and the DC / AC in the PCS, the energy management system controls the system to first apply high voltage to the BMS in the electrical cabinet according to the high voltage application timing. After the high voltage application to the BMS in the electrical cabinet is completed, the BMS in the electrical cabinet is connected to the DC / DC in the electrical cabinet. As a result, the electrical cabinet consisting of the BMS and DC / DC is connected in parallel to the DC bus, meaning the insulation detection module cannot obtain the insulation parameter value of the BMS in the electrical cabinet. The system controls the application of high voltage, and after the application of high voltage to the DC / DC is complete, the insulation detection module acquires common insulation parameter values ​​for the BMS and DC / DC in the electrical cabinet and transmits these insulation parameter values ​​to the energy management system, which then determines whether the insulation state detection of the electrical cabinet has passed based on these insulation parameter values. Finally, the system controls the application of high voltage to the DC / AC in the PCS, and after the application of high voltage to the DC / AC is complete, the insulation detection module acquires insulation parameter values ​​for the DC / AC and transmits these insulation parameter values ​​to the energy management system, which then determines whether the insulation state detection of the DC / AC has passed based on these insulation parameter values.

[0108] In S602, once the application of high voltage to each high-voltage assembly is complete and the insulation state detection of each high-voltage assembly has passed, the energy storage system performs insulation state detection.

[0109] In this embodiment, if the insulation state detection of a high-voltage assembly fails during the high-voltage application process of each high-voltage assembly, the insulation state detection of the corresponding energy storage system will also fail. If the insulation detection results for all high-voltage assemblies are passed, it is determined that both the low-voltage and high-voltage assemblies among the assemblies under test are normal. In this case, the energy management system must determine whether an insulation fault exists when the energy storage system is operating normally, after the high-voltage application to each high-voltage assembly is completed, in order to ensure the normal operation of the energy storage system.

[0110] In some exemplary embodiments, after high voltage application to each high voltage assembly is completed and the energy storage system is operating normally, the insulation detection module acquires insulation parameter values ​​for all assemblies under test in the energy storage system and transmits these insulation parameter values ​​to the energy management system. Based on these insulation parameter values, the energy management system can determine whether the insulation state detection of the energy storage system passed during the normal operation of the energy storage system. If the insulation state detection passes, it indicates that there are no faults in any of the assemblies under test inside the energy storage system, and the entire energy storage system is operating normally, the insulation detection process is completed, and if the insulation state detection fails, it indicates that there is a fault in one of the assemblies under test inside the energy storage system during operation. In this case, it is necessary to first shut off the high voltage to each assembly in the energy storage system, and then, depending on the timing of high voltage application, to check whether there is a fault in each assembly under test inside the energy storage system, or to manually check whether there is a fault in each assembly under test.

[0111] In the above insulation state detection method, in the process of applying high voltage to each high voltage assembly according to the high voltage application timing of each high voltage assembly, the high voltage application time for each high voltage assembly is short, and in the process of applying high voltage to each high voltage assembly multiple times, the time for insulation detection by the insulation detection module to perform insulation detection on the high voltage assembly is also short. At the same time, the insulation resistance value corresponding to each high voltage assembly can be obtained by one insulation detection module. When the application of high voltage to any of the high voltage assemblies is completed and the insulation state detection of each high voltage assembly is passed, the insulation detection module can accurately perform insulation state detection on the energy storage system. This process allows for immediate detection of the insulation resistance value of each high voltage assembly by one insulation detection module, reduces the number of interactions in the detection process, reduces the complexity of the high voltage assembly detection process, avoids multiple on / off cycles of the insulation detection module, and improves the detection efficiency of the insulation detection module.

[0112] Based on the above embodiment, this embodiment will explain the specific details of step S601, "Perform insulation detection operation after applying high voltage to each high-voltage assembly," in the embodiment shown in Figure 8. As shown in Figure 9, step S601 may include the following:

[0113] In S701, the system controls the application of a high voltage to one of the high-voltage assemblies, and the insulation resistance value is obtained by the insulation detection module after the application of the high voltage to the high-voltage assembly is complete.

[0114] In this embodiment, high voltage is applied to the high-voltage assembly among the assemblies under test according to the high-voltage application timing of the high-voltage assembly. The energy management system sends a high-voltage application command to each high-voltage assembly. After the high-voltage assembly receives the high-voltage application command, it turns off its internal relay, completing the high-voltage application operation to the high-voltage assembly. The insulation detection module can then acquire the insulation resistance value in a timely manner after the high-voltage application to the high-voltage assembly is completed.

[0115] In S702, the insulation state detection result of the high-voltage assembly is determined based on the insulation resistance value after the application of high voltage to the high-voltage assembly is completed.

[0116] In this embodiment, the energy management system can determine whether the insulation resistance value of the high-voltage assembly after the application of high voltage is completed satisfies a predetermined condition, and determine the insulation state detection result of the high-voltage assembly based on the determination result. For example, the predetermined condition may be a predetermined insulation range, a predetermined insulation threshold, or an error value between the insulation resistance value of the high-voltage assembly and a predetermined resistance value. If the predetermined condition is a predetermined insulation range, the system determines whether the insulation resistance value of the high-voltage assembly is within the predetermined insulation range, and determines the insulation state detection result of the high-voltage assembly based on the determination result. If the predetermined condition is a predetermined insulation threshold, the energy management system compares the insulation resistance value of the high-voltage assembly with a predetermined insulation resistance value, and determines the insulation state detection result of the high-voltage assembly based on the comparison result. If the predetermined condition is an error value between the insulation resistance value of the high-voltage assembly and a predetermined resistance value, the energy management system calculates the error value between the insulation resistance value of the high-voltage assembly and a predetermined resistance value, and determines the insulation state detection result of the high-voltage assembly based on this error value and the predetermined error value.

[0117] In S703, after obtaining the insulation state detection result for the high-voltage assembly, the system controls the application of high voltage to the next high-voltage assembly according to the high-voltage application timing until the insulation state detection results for all high-voltage assemblies are obtained.

[0118] In this embodiment, if the insulation resistance value satisfies the above-described predetermined conditions, the insulation state detection of the high-voltage assembly is deemed successful, meaning that no fault exists in the high-voltage assembly. If the insulation resistance value is not within the predetermined range, the insulation state detection of the high-voltage assembly fails, meaning that a fault exists in the high-voltage assembly.

[0119] Regardless of whether the insulation state detection of the high-voltage assembly passed or not, after obtaining the insulation state detection result of the high-voltage assembly, it is understood that the energy management system must control the system to perform a high-voltage application operation on the next high-voltage assembly according to the high-voltage application timing, and determine the insulation state detection result of the next high-voltage assembly, that is, determine whether or not an insulation fault exists in the next high-voltage assembly. By analogy, the insulation state detection result of each high-voltage assembly is determined sequentially according to the above method, and it is determined whether or not an insulation fault exists in each high-voltage assembly.

[0120] In the above insulation state detection method, the system controls the application of a high voltage to any one high voltage assembly, and the insulation resistance value is obtained by the insulation detection module after the application of the high voltage to the high voltage assembly is complete. Based on the insulation resistance value after the application of the high voltage to the high voltage assembly is complete, the insulation state detection result of the high voltage assembly can be determined. If the insulation state detection of the high voltage assembly is successful, the system controls the application of a high voltage to the next high voltage assembly according to the high voltage application timing until the insulation state detection results for all high voltage assemblies are obtained. By repeatedly detecting the insulation state of each high voltage assembly multiple times, the detection process for high voltage assemblies is made more standardized, the insulation state detection results for high voltage assemblies are made more accurate, and at the same time, each high voltage assembly is detected immediately by a single insulation detection module, reducing detection costs, and reducing the number of interactions in the detection process and the complexity of the interactions.

[0121] Based on the above embodiment, this embodiment will explain the specific details of step S701, "controlling the application of high voltage to the high-voltage assembly," in the embodiment shown in Figure 9. As shown in Figure 10, step S701 may include the following:

[0122] In S801, a high-voltage application command is sent to the high-voltage assembly, instructing it to turn off its internal relays in accordance with the high-voltage application command and to complete the high-voltage application.

[0123] In this embodiment, the energy management system and each high-voltage assembly are connected in a communicative manner. When it is necessary to apply high voltage to each high-voltage assembly in sequence, the energy management system sends a high-voltage application command to each high-voltage assembly. After receiving the high-voltage application command, the high-voltage assembly turns off its internal relay to complete the high-voltage application operation.

[0124] In S802, upon receiving the high-voltage application completion command returned from the high-voltage assembly, it is determined that the application of high voltage to the high-voltage assembly has been completed.

[0125] In this embodiment, after the energy management system sends a high-voltage application command to a high-voltage assembly, if it receives a high-voltage application completion command returned from the high-voltage assembly within a predetermined time, it can determine that the high-voltage assembly has already received the high-voltage application command. In some exemplary embodiments, it can determine that the high-voltage assembly has completed the high-voltage application operation in accordance with the received high-voltage application command, and thereby sends a high-voltage application command to the next high-voltage assembly according to the high-voltage application timing.

[0126] In the above insulation state detection method, a high voltage application command is sent to the high voltage assembly, instructing the high voltage assembly to turn off its internal relay in accordance with the high voltage application command and to complete the high voltage application. After the high voltage application to the high voltage assembly is completed, a high voltage application completion command is received from the high voltage assembly, and a high voltage command is sent to each high voltage assembly, and the high voltage is applied according to the high voltage application timing of the high voltage assembly, thereby avoiding confusion in the order of the high voltage application process for each high voltage assembly, eliminating the need to frequently turn the insulation detection module on and off in the high voltage assembly detection process, reducing the number of interactions in the detection process, and lowering the complexity of the high voltage assembly detection process.

[0127] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S702 in the embodiment of Figure 9, which is "determining the insulation state detection result of the high-voltage assembly based on the insulation resistance value after the application of high voltage to the high-voltage assembly is completed." As shown in Figure 11, step S702 may include the following:

[0128] In S901, the insulation resistance value of the high-voltage assembly is compared with a predetermined insulation fault resistance value.

[0129] In this embodiment, a predetermined insulation fault resistance value is a boundary line, an insulation resistance value on one side of the insulation fault resistance value is a normal resistance value indicating that the high-voltage assembly is operating normally, and an insulation resistance value on the other side of the insulation fault resistance value is an abnormal resistance value indicating that an insulation fault exists in the high-voltage assembly. After obtaining the insulation resistance value of the high-voltage assembly, the energy management system compares this insulation resistance value with the predetermined insulation fault resistance value to determine whether or not an insulation fault exists in the high-voltage assembly.

[0130] In S902, if the insulation resistance value of the high-voltage assembly is less than the insulation fault resistance value, the insulation state detection result of the high-voltage assembly is determined to be that there is an insulation fault; otherwise, the insulation state detection of the high-voltage assembly is determined to be successful.

[0131] In this embodiment, if the insulation resistance value of a high-voltage assembly is less than the insulation fault resistance value, it indicates that an insulation fault exists in the high-voltage assembly. If the insulation resistance value of a high-voltage assembly is equal to or greater than the insulation fault resistance value, the insulation state detection of the high-voltage assembly passes, indicating that there is no insulation fault in the high-voltage assembly.

[0132] In the above insulation state detection method, by comparing the insulation resistance value of the high-voltage assembly with a predetermined insulation fault resistance value, if the insulation resistance value of the high-voltage assembly is smaller than the insulation fault resistance value, the insulation state detection result of the high-voltage assembly is determined to be that there is an insulation fault. Otherwise, the insulation state detection of the high-voltage assembly is determined to be successful. Based on the comparison result of the insulation resistance value of the high-voltage assembly with the predetermined insulation fault resistance value, the insulation state detection result of the high-voltage assembly can be accurately determined, and it can be accurately determined whether or not an insulation fault exists in the high-voltage assembly.

[0133] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S602, "Perform insulation state detection on the energy storage system," in the embodiment shown in Figure 8. As shown in Figure 12, step S602 may include the following:

[0134] In S1001, the insulation resistance value of the energy storage system is detected by the insulation detection module.

[0135] In this embodiment, once the application of low voltage to the low-voltage assembly and the application of high voltage to the high-voltage assembly among the assemblies under test are completed, and there are no insulation faults in either the low-voltage or high-voltage assembly, the energy storage system is in a state where it can operate normally at high voltage, the insulation detection module can acquire the insulation resistance value of the entire energy storage system, and transmit the insulation resistance value of the energy storage system to the energy management system, and the energy management system can acquire the insulation resistance value of the energy storage system detected by the insulation detection module.

[0136] In S1002, the insulation state detection result of the energy storage system is determined based on the insulation resistance value of the energy storage system.

[0137] In this embodiment, the energy management system can determine whether the insulation resistance value of the energy storage system satisfies predetermined conditions and, based on the determination result, determine the insulation state detection result of the energy storage system. For example, the predetermined conditions may be a predetermined insulation range, a predetermined insulation threshold, or an error value between the insulation resistance value of the energy storage system and a predetermined resistance value. If the predetermined condition is a predetermined insulation range, the system determines whether the insulation resistance value of the energy storage system is within the predetermined insulation range and, based on the determination result, determines the insulation state detection result of the energy storage system. If the predetermined condition is a predetermined insulation threshold, the energy management system compares the insulation resistance value of the energy storage system with a predetermined insulation resistance value and, based on the comparison result, determines the insulation state detection result of the energy storage system.

[0138] In the above insulation state detection method, when detecting an energy storage system using an insulation detection module, it is necessary to specifically distinguish the energy storage system. By obtaining and detecting the insulation resistance value of the entire energy storage system using the insulation detection module, it is possible to quickly determine whether or not an insulation fault exists when the energy storage system is operating normally. At the same time, a single insulation detection module can not only detect each assembly under test, but also the entire energy storage system, thereby reducing the hardware cost of insulation detection for the energy storage system.

[0139] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S1002 in the embodiment of Figure 12, which is "determining the insulation state detection result of the energy storage system based on the insulation resistance value of the energy storage system." As shown in Figure 13, step S1002 may include the following:

[0140] In S1101, the insulation resistance value of the energy storage system is compared with a predetermined insulation fault resistance value.

[0141] In this embodiment, a predetermined insulation fault resistance value is a boundary line, an insulation resistance value on one side of the insulation fault resistance value is a normal resistance value indicating that the energy storage system is operating normally, and an insulation resistance value on the other side of the insulation fault resistance value is an abnormal resistance value indicating that an insulation fault exists in the energy storage system. After obtaining the insulation resistance value of the energy storage system, the energy management system compares this insulation resistance value with the predetermined insulation fault resistance value to determine whether or not an insulation fault exists in the energy storage system.

[0142] In S1102, if the insulation resistance value of the energy storage system is less than the insulation fault resistance value, the insulation state detection result of the energy storage system is determined to be an insulation fault; otherwise, the insulation state detection of the energy storage system is determined to have passed.

[0143] In this embodiment, if the insulation resistance value of the energy storage system is less than the insulation fault resistance value, it indicates that an insulation fault exists in a certain assembly under test within the energy storage system during normal operation. However, it is not possible to determine specifically which assembly under test has the insulation fault, and it is necessary to perform fault detection again on the assembly under test within the energy storage system at low and high voltages. If the insulation resistance value of the energy storage system is greater than or equal to the insulation fault resistance value, the insulation state detection of the energy storage system passes, indicating that there is no insulation fault in the energy storage system and that the energy storage system operates normally.

[0144] In the above insulation state detection method, by comparing the insulation resistance value of the energy storage system with a predetermined insulation fault resistance value, if the insulation resistance value of the energy storage system is smaller than the insulation fault resistance value, the insulation state detection result of the energy storage system is determined to be that there is an insulation fault. Otherwise, the insulation state detection of the energy storage system is determined to be successful. Based on the comparison result between the insulation resistance value of the energy storage system and the predetermined insulation fault resistance value, the insulation state detection result of the energy storage system can be accurately determined, and it can be accurately determined whether or not an insulation fault exists in the energy storage system.

[0145] Based on the above embodiment, this embodiment will introduce and explain the specific details of inspecting each component under test in the energy storage system when the insulation state detection of the energy storage system indicates an insulation fault. As shown in Figure 14, the above method may further include the following.

[0146] In S1201, if the insulation status detection of the energy storage system indicates an insulation fault, a high-voltage shutdown command is issued to each high-voltage assembly, instructing each high-voltage assembly to perform a high-voltage shutdown.

[0147] In this embodiment, after the application of high voltage to each high-voltage assembly is completed, if the insulation resistance value obtained by the insulation detection module is smaller than a predetermined insulation fault resistance value while the energy storage system is in normal operation, an insulation fault exists in a certain assembly under test in the energy storage system while it is in normal operation. The energy management system may simultaneously send a high-voltage shutdown command to the high-voltage assembly among the assemblies under test, or the energy management system may sequentially send high-voltage shutdown commands to the high-voltage assemblies according to the high-voltage shutdown timing corresponding to the high-voltage assembly. After each high-voltage assembly receives a high-voltage shutdown command, it performs a high-voltage shutdown operation in accordance with the command.

[0148] In S1202, after the high voltage interruption for each high voltage assembly is completed, the insulation detection operation after applying high voltage is performed on each high voltage assembly to determine the detection result of the insulation state inspection for each high voltage assembly.

[0149] In this embodiment, after performing a high-voltage interruption operation on each high-voltage assembly, the energy management system is fed back the completion of the high-voltage interruption operation. In this case, each assembly under test in the energy storage system is in a low-voltage state. The insulation detection module detects the insulation resistance value of the low-voltage assembly and transmits this insulation resistance value to the energy management system. The energy management system can then determine whether or not an insulation fault exists in the low-voltage assembly based on its insulation resistance value. If it is determined that no insulation fault exists in the low-voltage assembly, the energy management system controls the system to sequentially apply high voltage to each high-voltage assembly, and the insulation detection module detects the insulation resistance value of each high-voltage assembly. Based on the insulation resistance value of each high-voltage assembly, the system determines the detection result of the insulation state inspection for each high-voltage assembly.

[0150] In S1203, based on the detection results of the insulation condition inspection of each high-voltage assembly, the high-voltage assembly that causes an insulation failure in the energy storage system is determined.

[0151] In this embodiment, if the insulation state detection process for each high-voltage assembly fails for any one or more of the high-voltage assemblies, it is determined that an insulation fault exists in the high-voltage assembly corresponding to that insulation state. That is, an insulation fault does not exist in the process of performing a high-voltage application test on the high-voltage assembly, but an insulation fault exists in the process of the energy storage system operating normally.

[0152] In the above insulation state detection method, if the insulation state detection of the energy storage system indicates the presence of an insulation fault, it indicates that the insulation fault exists during the normal operation process of the energy storage system. However, it is not possible to determine which component under test in the energy storage system has the insulation fault. Therefore, a high-voltage cutoff command is issued to each high-voltage component, instructing each high-voltage component to perform a high-voltage cutoff. After the high-voltage cutoff for each high-voltage component is completed, it is ensured that each component under test is in a low-voltage state, and it is possible to determine whether or not an insulation fault exists in the low-voltage component. If no insulation fault is found in the low-voltage component, the insulation detection operation after applying high voltage is performed on each high-voltage component to obtain the insulation resistance value corresponding to each high-voltage component. Based on this insulation resistance value, each high-voltage component can be accurately inspected, and the detection result of the insulation state inspection for each high-voltage component can be determined. Based on the detection result of the insulation state inspection for each high-voltage component, the high-voltage component that causes the insulation fault in the energy storage system can be accurately identified, improving the accuracy of insulation state detection.

[0153] Based on the above embodiment, this embodiment will describe the specific details of how to turn off the isolation detection module. The above method may further include sending an isolation detection ON command to the isolation detection module to switch the isolation detection module to the ON state when it is detected that a low voltage has been applied to each assembly under test.

[0154] In this embodiment, when it is determined that a low voltage has been applied to each assembly under test, the energy management system can send an insulation detection ON command to the insulation detection module. This insulation detection ON command is used to switch the insulation detection module from the OFF state to the ON state and instruct it to perform insulation resistance detection for the resistance value of each assembly under test.

[0155] In the above insulation state detection method, when it is detected that a low voltage has been applied to each assembly under test, an insulation detection ON command is sent to the insulation detection module in a timely manner, switching the insulation detection module to the ON state. The insulation detection module remains in the ON state at all times and does not automatically turn OFF, allowing for immediate detection of the insulation resistance value of each assembly under test throughout the entire process. This avoids multiple ON / OFF cycles of the insulation detection module, reduces the number of interactions in the detection process, and lowers the complexity of the interactions in the detection process.

[0156] Based on the above embodiment, this embodiment will introduce and explain specific details of how to prompt the assembly under test to perform inspection and maintenance if an insulation fault is present. The above method may further include outputting prompt information to any one of the assemblies under test if the insulation status result of the assemblies under test indicates the presence of an insulation fault, instructing the assemblies under test to perform inspection and maintenance of the insulation fault.

[0157] In this embodiment, if it is determined that an insulation fault exists in any one of the components under test in the energy storage system, the energy management system outputs information to the technician, which includes the specific component under test and whether the insulation fault was detected while voltage was being applied to that component, or whether the insulation fault was detected during the safe operation of the energy storage system. The format in which the information is output may be audio, text, or a combination of audio and text.

[0158] In the above insulation state detection method, if the insulation state result for any one of the assembled components is found to have an insulation fault, information can be output to the technician in a timely manner, allowing the technician to perform timely inspections and maintenance of the assembled components for insulation faults in order to ensure the safe operation of the energy storage system.

[0159] In one embodiment, as shown in Figure 15, an embodiment of the insulation state detection method is further provided, which may include the following steps S1301 to S1319.

[0160] In S1301, if it is detected that a low voltage has been applied to each assembly under test, an isolation detection ON command is sent to the isolation detection module to switch the isolation detection module to the ON state.

[0161] In S1302, in response to the insulation detection module being in the ON state, the insulation resistance value of the low-voltage assembly detected by the insulation detection module is obtained.

[0162] In S1303, the insulation resistance value of the low-voltage assembly is compared with a predetermined insulation fault resistance value.

[0163] In S1304, if this is the case, the insulation resistance value of the low-voltage assembly is smaller than the insulation fault resistance value, and the insulation state detection result of the low-voltage assembly is determined to be that there is an insulation fault.

[0164] In S1305, it is determined that the insulation state detection of the low-voltage assembly has passed, otherwise, step S1306 is performed.

[0165] In S1306, depending on the high voltage application timing of each high voltage assembly, a high voltage application command is sent to one of the high voltage assemblies, instructing the high voltage assembly to turn off its internal relay in accordance with the high voltage application command and to complete the high voltage application.

[0166] In S1307, upon receiving the high-voltage application completion command returned from the high-voltage assembly, it is determined that the application of high voltage to the high-voltage assembly has been completed.

[0167] In S1308, the insulation resistance value is obtained by the insulation detection module after the high voltage has been applied to the high-voltage assembly.

[0168] In S1309, the insulation resistance value of the high-voltage assembly is compared with a predetermined insulation fault resistance value.

[0169] In S1310, if this is the case, the insulation resistance value of the high-voltage assembly is smaller than the insulation fault resistance value, and the insulation state detection result of the high-voltage assembly is determined to be that there is an insulation fault.

[0170] In step S1311, it is determined that the insulation state detection of the high-voltage assembly has passed, otherwise step S1312 is performed.

[0171] In S1312, the insulation resistance value of the energy storage system is detected by the insulation detection module.

[0172] In S1313, the insulation resistance value of the energy storage system is compared with a predetermined insulation fault resistance value.

[0173] In S1314, if so, the insulation resistance value of the energy storage system is smaller than the insulation fault resistance value, and the insulation state detection result of the energy storage system is determined to be an insulation fault, and step S1316 is executed.

[0174] In S1315, it is determined that the insulation state detection of the energy storage system has passed.

[0175] In S1316, a high-voltage shutdown command is issued to each high-voltage assembly, instructing each high-voltage assembly to perform high-voltage shutdown.

[0176] In S1317, after the high voltage interruption for each high voltage assembly is completed, the insulation detection operation after applying high voltage is performed on each high voltage assembly to determine the detection result of the insulation state inspection for each high voltage assembly.

[0177] In S1318, based on the detection results of the insulation condition inspection of each high-voltage assembly, the high-voltage assembly that causes an insulation failure in the energy storage system is determined.

[0178] In S1319, if the insulation condition result for any one of the inspected assemblies indicates an insulation fault, information is output to instruct the inspected assembly to perform an insulation fault inspection and maintenance.

[0179] In the above insulation state detection method, the energy management system is communicatively connected to multiple assemblies under test and one insulation detection module. Simultaneously, each assembly under test and the insulation detection module are connected in parallel to the same DC bus. This implementation simplifies the circuit connection relationship, and in the insulation state detection process, only one insulation detection module can detect the insulation state of multiple assemblies under test and energy storage systems. This reduces the hardware cost input in the insulation state detection process. Furthermore, when performing insulation state detection on each assembly under test and energy storage system, it is performed in accordance with the voltage application and voltage cutoff timing of each assembly under test. Thus, based on a simple circuit connection configuration, it is possible to sequentially perform insulation state detection on each assembly under test and energy storage system at set voltage application and voltage cutoff timings, reducing interaction in the detection process, simplifying the insulation fault detection process for each assembly under test and energy storage system, and reducing the complexity of the insulation fault detection process for energy storage systems.

[0180] In the flowcharts relating to each of the above embodiments, the steps are shown sequentially according to the arrows, but please understand that these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise explicitly stated herein, there are no strict order restrictions on the execution of these steps, and they may be performed in other orders. Furthermore, at least some of the steps in the flowcharts relating to each of the above embodiments may include multiple steps or stages, and these steps or stages do not necessarily have to be completed at the same time, but can be performed at different time points, and the execution order of these steps or stages does not necessarily have to be sequential, but can be performed sequentially or alternately with other steps or at least some of the steps or stages in other steps.

[0181] Based on the same inventive concept, embodiments of the present application further provide an insulation state detection device for realizing the insulation state detection method described above. Since the means for solving the problems provided by the device are similar to the means for realizing the method described above, specific limitations in the embodiments of one or more insulation state detection devices provided below can refer to the limitations on the insulation state detection method described above and will not be described in detail here.

[0182] In one embodiment, as shown in Figure 16, The present invention provides an insulation state detection device including a detection module 161 for sequentially detecting the insulation state of each assembly under test and an energy storage system in accordance with the voltage application and voltage interruption timing of each assembly under test, in response to the insulation detection module being in the ON state.

[0183] In one embodiment, the detection module 161 is An acquisition unit for acquiring the low-voltage application state of each test assembly and the high-voltage application timing of the high-voltage assembly among the test assemblies, The system includes a detection unit for sequentially detecting the insulation state of each assembly under test and the energy storage system using an insulation detection module, in accordance with the low voltage application state of each assembly under test and the high voltage application timing of the high voltage assembly among the assemblies under test.

[0184] In one embodiment, the detection unit applies a low voltage to each assembly under test, and then the insulation detection module performs insulation state detection on the low-voltage assembly among the assemblies under test. If the insulation state detection of the low-voltage assembly passes, the insulation detection module performs insulation state detection on each high-voltage assembly and the energy storage system according to the high-voltage application timing of each high-voltage assembly among the assemblies under test.

[0185] In one embodiment, the detection unit further acquires the insulation resistance value of the low-voltage assembly detected by the insulation detection module, This is used to determine the insulation state detection result of a low-voltage assembly based on its insulation resistance value.

[0186] In one embodiment, the detection unit further compares the insulation resistance value of the low-voltage assembly with a predetermined insulation fault resistance value. This is used to determine that an insulation fault exists in the low-voltage assembly if its insulation resistance is less than its insulation fault resistance, and to determine that the insulation state detection of the low-voltage assembly has passed otherwise.

[0187] In one embodiment, the detection unit further performs insulation detection on each high-voltage assembly by executing an insulation detection operation on each high-voltage assembly after high voltage application, according to the high voltage application timing of each high-voltage assembly, Once high voltage application to each high voltage assembly is complete and the insulation state detection of each high voltage assembly is successful, it is used to perform insulation state detection on the energy storage system.

[0188] In one embodiment, the detection unit further controls the application of a high voltage to any one of the high-voltage assemblies, and the insulation detection module obtains the insulation resistance value after the application of the high voltage to the high-voltage assembly is completed. Based on the insulation resistance value after the high voltage has been applied to the high-voltage assembly, the insulation state detection result of the high-voltage assembly is determined. After obtaining the insulation state detection result for a high-voltage assembly, this is used to control the application of high voltage to the next high-voltage assembly according to the high-voltage application timing until the insulation state detection result for all high-voltage assemblies has been obtained.

[0189] In one embodiment, the detection unit further transmits a high-voltage application command to the high-voltage assembly, instructing the high-voltage assembly to turn off its internal relays in accordance with the high-voltage application command and to complete the high-voltage application. This is used to receive the high-voltage application completion command returned from the high-voltage assembly and to determine that the application of high voltage to the high-voltage assembly has been completed.

[0190] In one embodiment, the detection unit further compares the insulation resistance value of the high-voltage assembly with a predetermined insulation fault resistance value. This is used to determine that an insulation fault exists in a high-voltage assembly if its insulation resistance is less than its insulation fault resistance, and to determine that the insulation state detection of the high-voltage assembly has passed if it does not.

[0191] In one embodiment, the detection unit further detects the insulation resistance value of the energy storage system using an insulation detection module. This is used to determine the insulation state detection result of an energy storage system based on its insulation resistance value.

[0192] In one embodiment, the detection unit further compares the insulation resistance value of the energy storage system with a predetermined insulation fault resistance value. If the insulation resistance value of the energy storage system is less than the insulation fault resistance value, it is used to determine that there is an insulation fault in the energy storage system's insulation state detection result; otherwise, it is used to determine that the energy storage system's insulation state detection has passed.

[0193] In one embodiment, if the insulation state detection of the energy storage system indicates an insulation fault, the detection unit further issues a high-voltage shutdown command to each high-voltage assembly, instructing each high-voltage assembly to perform a high-voltage shutdown. After the high-voltage interruption is completed for each high-voltage assembly, the insulation detection operation after applying high voltage is performed on each high-voltage assembly to determine the detection result of the insulation state inspection for each high-voltage assembly. Based on the results of insulation condition inspections of each high-voltage assembly, this is used to determine which high-voltage assembly is causing the insulation failure in the energy storage system.

[0194] In one embodiment, after detecting that a low voltage has been applied to each assembly under test, the detection unit is further used to send an isolation detection ON command to the isolation detection module to switch the isolation detection module to the ON state.

[0195] In one embodiment, for any one of the assemblies under test, the detection unit is further used to output information instructing the assemblies under test to perform insulation fault inspection and maintenance if the insulation condition result of the assemblies under test indicates an insulation fault.

[0196] All or part of the modules in the above-described insulation state detection device can be implemented by software, hardware, or a combination thereof. Each of the above modules may be built into the processor of a computer device in hardware form, or independently thereof, or may be stored in the memory of the computer device in software form so that the processor can call and execute operations corresponding to each of the above modules.

[0197] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in Figure 17. The computer device includes a processor, memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the execution of the operating system and computer programs on the non-volatile storage medium. The database of the computer device is used to store data in an isolation state detection process. The network interface of the computer device is used to connect and communicate with external terminals via a network. The computer program implements an isolation state detection method when executed by the processor.

[0198] As a person skilled in the art will understand, the structure shown in Figure 17 is merely a structural block diagram of a part related to the present invention and does not limit the computer equipment to which the present invention applies. Specific computer equipment may include more or fewer components than those shown, or may have combinations of several components, or different component arrangements.

[0199] In one embodiment, a computer device is provided that includes a memory in which a computer program is stored, and a processor that implements the steps of the method in any one embodiment of the above-described embodiment of the isolation state detection method when the computer program is executed.

[0200] In one embodiment, a computer-readable storage medium is provided which stores a computer program that, when executed by a processor, implements the steps of the method in any one of the embodiments of the above-described insulation state detection method.

[0201] In one embodiment, a computer program product is provided that includes a computer program that, when executed by a processor, implements the steps of the method in any one of the embodiments of the above-described insulation state detection method.

[0202] As those skilled in the art will understand, all or part of the processes in the above embodiments can be implemented by instructing the relevant hardware with a computer program, which can be stored in a non-volatile computer-readable storage medium and, when executed, may include the processes of each embodiment of the above embodiments. Any use of memory, database, or other medium in each embodiment provided herein may include at least one of non-volatile memory and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. For illustrative purposes only, rather than being limited, RAM may take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The processors in each embodiment provided herein may be, but are not limited to, general-purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, or quantum computing-based data processing logic devices.

[0203] Finally, it should be noted that the above embodiments are merely for illustrating, and not for limiting, the technical solutions of the present application. Although the present application has been described in detail with reference to the embodiments described above, as will be understood by those skilled in the art, the technical solutions described in the embodiments described above can still be modified, or some or all of their technical features can be replaced with equivalent substitutions. Such modifications or substitutions will not cause the substance of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and all such modifications and substitutions should be included within the scope of the claims and specification of the present application. In particular, all technical features mentioned in each embodiment can be combined in any way, as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions within the claims. [Explanation of Symbols]

[0204] 11 Energy storage systems 111 Energy Storage Inverter 112 Battery Management System 12 Power grid 13 Energy Management Systems 14 Multiple isolation detection modules 21 Energy Storage Systems 211 Electrical Cabinet 2111 Battery Management System 2112 DC Chopper 212 Solar power panel controller 213 Energy Storage Inverter 2131 Inverter 2132 Control Unit 22. Insulation detection module

Claims

1. An insulation state detection method applied to an energy management system, wherein the energy management system is communicatively connected to a plurality of assemblies under test and one insulation detection module, each of the assemblies under test and the insulation detection module is connected in parallel to the same DC bus, and the method is: The insulation detection module, in response to being in the ON state, includes the step of sequentially performing insulation state detection on each of the assemblies under test and the energy storage system in accordance with the voltage application and voltage interruption timing of each assembly under test, The voltage application and cutoff timings include low voltage application and high voltage application timings, and the step of sequentially detecting the insulation state of each assembly under test and the energy storage system by the insulation detection module according to the voltage application and cutoff timings of each assembly under test is as follows: The steps include obtaining the low-voltage application state of each assembly under test and the high-voltage application timing of the high-voltage assembly among the assemblies under test, An insulation state detection method comprising the step of sequentially performing insulation state detection on each of the assemblies under test and the energy storage system using the insulation detection module, in accordance with the low voltage application state of each of the assemblies under test and the high voltage application timing of the high voltage assembly among the assemblies under test.

2. The step of sequentially performing insulation state detection on each of the assemblies under test and the energy storage system using the insulation detection module, in accordance with the low voltage application state of each assembly under test and the high voltage application timing of the high voltage assembly among the assemblies under test, is as follows: The steps include: applying a low voltage to each of the assemblies under test, and then using the insulation detection module to detect the insulation state of the low-voltage assembly among the assemblies under test; The method according to claim 1, further comprising the step of performing insulation state detection on each of the high-voltage assemblies and the energy storage system by the insulation detection module in accordance with the high-voltage application timing of each high-voltage assembly in each of the assemblies under test, if the insulation state detection of the low-voltage assembly is successful.

3. The step of performing insulation state detection on the low-voltage assembly among the assemblies under test using the insulation detection module is: The steps include: obtaining the insulation resistance value of the low-voltage assembly detected by the insulation detection module; The method according to claim 2, comprising the step of determining the insulation state detection result of the low-voltage assembly based on the insulation resistance value of the low-voltage assembly.

4. The step of determining the insulation state detection result of the low-voltage assembly based on the insulation resistance value of the low-voltage assembly is: The steps include comparing the insulation resistance value of the low-voltage assembly with a predetermined insulation fault resistance value, The method according to claim 3, comprising the steps of determining that an insulation fault exists in the insulation state detection result of the low-voltage assembly if the insulation resistance value of the low-voltage assembly is less than the insulation fault resistance value, and determining that the insulation state detection of the low-voltage assembly has passed if the insulation resistance value of the low-voltage assembly is equal to or greater than the insulation fault resistance value.

5. The step of performing insulation state detection on each high-voltage assembly and the energy storage system by the insulation detection module in accordance with the high-voltage application timing of each high-voltage assembly in each assembly under test is as follows: The steps include: performing an insulation detection operation on each of the high-voltage assemblies after applying high voltage, in accordance with the high-voltage application timing of each of the high-voltage assemblies, thereby detecting the insulation state of each of the high-voltage assemblies; The method according to claim 2, further comprising the step of performing an insulation state detection on the energy storage system when the application of a high voltage to any of the high voltage assemblies has been completed and the insulation state detection of each of the high voltage assemblies has passed.

6. The step of performing an insulation detection operation after applying a high voltage to each of the high-voltage assemblies is: The steps include: controlling the application of a high voltage to any one of the high-voltage assemblies, and obtaining the insulation resistance value after the application of the high voltage to the high-voltage assemblies is completed by the insulation detection module; The steps include determining the insulation state detection result of the high-voltage assembly based on the insulation resistance value after the application of high voltage to the high-voltage assembly is completed, The method according to claim 5, further comprising the step of, after obtaining the insulation state detection result of the high-voltage assembly, controlling the application of a high voltage to the next high-voltage assembly in accordance with the high-voltage application timing until the insulation state detection results of all high-voltage assemblies are obtained.

7. The step of controlling the application of a high voltage to the high-voltage assembly is: The steps include: transmitting a high-voltage application command to the high-voltage assembly, instructing the high-voltage assembly to turn off its internal relays in accordance with the high-voltage application command and to complete the application of high voltage; The method according to claim 6, comprising the step of receiving a high voltage application completion command returned from the high voltage assembly and determining that the application of high voltage to the high voltage assembly has been completed.

8. The step of determining the insulation state detection result of the high-voltage assembly based on the insulation resistance value after the application of high voltage to the high-voltage assembly is completed is as follows: The steps include comparing the insulation resistance value of the high-voltage assembly with a predetermined insulation fault resistance value, The method according to claim 6, comprising the steps of determining that an insulation fault exists in the insulation state detection result of the high-voltage assembly if the insulation resistance value of the high-voltage assembly is less than the insulation fault resistance value, and determining that the insulation state detection of the high-voltage assembly has passed if the insulation resistance value of the high-voltage assembly is equal to or greater than the insulation fault resistance value.

9. The step of performing insulation state detection on the energy storage system is: The steps include: detecting the insulation resistance value of the energy storage system using the insulation detection module; The method according to claim 5, comprising the step of determining the insulation state detection result of the energy storage system based on the insulation resistance value of the energy storage system.

10. The step of determining the insulation state detection result of the energy storage system based on the insulation resistance value of the energy storage system is: The steps include comparing the insulation resistance value of the energy storage system with a predetermined insulation fault resistance value, The method according to claim 9, comprising the steps of determining that an insulation fault exists in the insulation state detection result of the energy storage system if the insulation resistance value of the energy storage system is less than the insulation fault resistance value, and determining that the insulation state detection of the energy storage system has passed if the insulation resistance value of the energy storage system is equal to or greater than the insulation fault resistance value.

11. The aforementioned method, If the insulation state detection of the energy storage system indicates an insulation fault, the step of issuing a high-voltage shutdown command to each of the high-voltage assemblies and instructing each of the high-voltage assemblies to perform a high-voltage shutdown, After the high voltage interruption for each of the high voltage assemblies is completed, the detection result of the insulation state inspection for each of the high voltage assemblies is determined by performing the insulation detection operation after the high voltage has been applied to each of the high voltage assemblies. The method according to claim 5, further comprising the step of determining which high-voltage assembly causes an insulation failure in the energy storage system based on the detection results of an insulation condition inspection of each of the high-voltage assemblies.

12. The step of determining which high-voltage assembly causes an insulation failure in the energy storage system based on the detection results of the insulation condition inspection of each of the high-voltage assemblies is: The method according to claim 11, further comprising the step of determining, if at least one insulation condition detection of each of the high-voltage assemblies fails, that high-voltage assembly that fails detection is the high-voltage assembly that causes an insulation failure in the energy storage system.

13. Prior to the step in which the isolation detection module is turned on, the method The method according to claim 1, further comprising the step of transmitting an isolation detection ON command to the isolation detection module to switch the isolation detection module to the ON state when it is detected that a low voltage has been applied to each of the assemblies under test.

14. The aforementioned method, The method according to claim 1, further comprising the step of outputting information to prompt the inspector to perform an inspection and maintenance of the inspected assembly if the insulation condition result of the inspected assembly indicates that an insulation fault is present.

15. An insulation state detection system comprising a plurality of assemblies under test and one insulation detection module, wherein the plurality of assemblies under test and the insulation detection module are all communicably connected to an energy management system, and each of the assemblies under test and the insulation detection module is connected in parallel to the same DC bus in an energy storage system. The energy management system is an insulation state detection system used to sequentially perform insulation state detection on each of the assemblies under test and the energy storage system by the insulation state detection module in response to the insulation state detection module being ON, in accordance with the voltage application and voltage cutoff timing of each assembly under test.

16. An energy storage system including the insulation state detection system according to claim 15.

17. An insulation state detection device utilizing the method according to any one of claims 1 to 14, comprising a detection module for sequentially detecting the insulation state of each of the assemblies under test and the energy storage system in accordance with the voltage application and voltage interruption timing of each assembly under test in the energy storage system, in response to the insulation detection module being in an ON state.

18. A computer-readable storage medium storing a computer program that, when executed by a processor, enables the implementation of a step of any one of claims 1 to 14.

19. A computer program that, when executed by a processor, implements a step of the method according to any one of claims 1 to 14.

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