Insulation condition detection method, system, device, 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 references Chinese Patent Application No. 2022114741507, filed on November 23, 2022, entitled "Insulation State Detection Method, System, Apparatus, Storage Medium and Program Product," the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of power technology, and in particular to an insulation condition detection method, system, device, storage medium and program product. [Background technology]

[0003] With the rapid development of energy storage technology, energy storage systems have been widely applied in large-scale energy applications, so ensuring the safety of energy storage systems is of great importance.

[0004] Generally, various faults in an energy storage system are checked to ensure the safe and stable operation of the energy storage system. For example, faults in an energy storage system can include insulation faults, leakage current faults, temperature faults, etc. Taking insulation faults as an example, in some cases, the process of detecting insulation faults in an energy storage system requires checking each assembly of each branch in the energy storage system one by one, which makes the process of detecting insulation faults in the energy storage system complicated. Summary of the Invention

[0005] Based on this, in order to address the above technical challenges, there is a need to provide an insulation status 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 an energy storage system.

[0006] In a first aspect, the present application provides an insulation state detection method applied to an energy management system, the energy management system being communicatively connected to a plurality of test assemblies and one insulation detection module, each of the test assemblies and the insulation detection module being connected in parallel to a same DC bus, the method comprising: The insulation state detection method includes a step of performing insulation state detection for each test assembly and energy storage system in sequence by the insulation detection module in response to the insulation detection module being in an on state, according to the timing of voltage application and voltage interruption for each test assembly.

[0007] In the technical solution of the embodiment of the present application, the energy management system is communicatively connected to a plurality of assemblies under test and one insulation detection module, and at the same time, the assemblies under test and the insulation detection modules are all connected in parallel to the same DC bus. This implementation simplifies the circuit connection relationship, and in the insulation status detection process, only one insulation detection module is used to detect the insulation status of the plurality of assemblies under test and the energy storage system, thereby reducing the hardware cost involved in the insulation status detection process. In addition, when detecting the insulation status of each assembly under test and the energy storage system, it is performed in accordance with the voltage application and voltage cut-off timing of each assembly under test. In this way, based on the simple circuit connection configuration, it is possible to sequentially detect the insulation status of each assembly under test and the energy storage system according to the set voltage application and voltage cut-off timing, reducing the interaction in the detection process, simplifying the insulation fault detection process of each assembly under test and the energy storage system, and reducing the complexity of the insulation fault detection process of the energy storage system.

[0008] In one embodiment, the voltage application and voltage cutoff timings include low voltage application and high voltage application timings, and the step of sequentially detecting the insulation state of each test assembly and the energy storage system by the insulation detection module according to the voltage application and voltage cutoff timings of each test assembly includes: acquiring a low voltage application state of each test assembly and a high voltage application timing of a high voltage assembly among the test assemblies; The step includes a step of sequentially detecting the insulation state of each test assembly and the energy storage system by the insulation detection module according to the low voltage application state of each test assembly and the timing of high voltage application of the high voltage assembly among the test assemblies.

[0009] In the technical solution of the embodiment of the present application, the voltage application and voltage cut-off timing of each test assembly is divided into the low voltage application state and the high voltage application timing of each test assembly. In this way, when the insulation detection module performs insulation state detection for each test assembly and the energy storage system, it can be further subdivided to indicate the detection logic according to the low voltage application state of each test assembly and the high voltage application timing of the high voltage assembly among each test assemblies. The voltage application timing of the energy storage system itself is to apply a low voltage first and then apply a high voltage, which is equivalent to setting the voltage application and voltage cut-off 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 for each test assembly and the energy storage system. In some exemplary embodiments, the high voltage application timing is the timing for the high voltage assemblies, and the high voltage is applied to the high voltage assemblies in a certain order, so that the insulation detection module sequentially detects the insulation status of the high voltage assemblies. This not only reduces the number of interactions in detecting the insulation status of the high voltage assemblies and reduces the complexity of detecting the insulation status of the high voltage assemblies, but also greatly shortens the time required to detect the insulation status of the high voltage assemblies, and improves the efficiency of the insulation status detection.

[0010] In one embodiment, the step of detecting the insulation state of each test assembly and the energy storage system by the insulation detection module in sequence according to the low voltage application state of each test assembly and the high voltage application timing of the high voltage assembly among the test assemblies includes: applying a low voltage to each of the test assemblies, and then performing insulation state detection on the low voltage assembly of each of the test assemblies by the insulation detection module; If the insulation status detection of the low-voltage assembly is successful, the insulation status detection module performs insulation status detection on each high-voltage assembly and the energy storage system according to the timing of high voltage application of each high-voltage assembly among the tested assemblies.

[0011] In the technical solution of the embodiment of the present application, after applying a low voltage to each test assembly, the insulation detection module can perform insulation state detection on the low-voltage assembly among the test assemblies. If the insulation state detection of the low-voltage assembly passes, the insulation detection module will perform insulation state detection on each high-voltage assembly and the energy storage system according to the timing of applying a high voltage to each high-voltage assembly among the test assemblies. In the present application, the voltage application process is divided into low voltage application and high voltage application, and each test assembly is correspondingly divided 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 test assembly can be determined. In some exemplary embodiments, the insulation detection module further performs insulation state detection on multiple high voltage assemblies of each test assembly according to the timing of high voltage application of the high voltage assembly, thereby reducing the number of interactions in the low voltage application / high voltage application detection process of each test assembly and further reducing the complexity of the detection process of each test assembly.

[0012] In one embodiment, the step of performing insulation condition detection on the low voltage assembly of each test assembly by the insulation detection module includes: obtaining an insulation resistance value of the low voltage assembly detected by the insulation detection module; and determining an insulation state detection result of the low voltage assembly based on the insulation resistance value of the low voltage assembly.

[0013] In the technical solution of the embodiments of the present application, when detecting low-voltage assemblies, the insulation detection module does not need to specifically distinguish between low-voltage assemblies. The insulation resistance values ​​of all low-voltage assemblies can be quickly detected by the insulation detection module. After obtaining the insulation resistance values ​​of the low-voltage assemblies in a timely manner, the insulation resistance values ​​of the low-voltage assemblies can be analyzed, and the insulation status detection results of the low-voltage assemblies can be quickly determined, thereby improving the efficiency of the insulation detection results of the low-voltage assemblies.

[0014] In one embodiment, the step of determining an insulation state detection result of the low voltage assembly based on an insulation resistance value of the low voltage assembly includes: 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 less than the insulation fault resistance value, determining that the insulation status detection result of the low-voltage assembly indicates that there is an insulation fault; otherwise, determining that the insulation status detection of the low-voltage assembly is 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, it is determined that the insulation status detection result of the low-voltage assembly has an insulation fault; otherwise, it is determined that the insulation status detection of the low-voltage assembly has passed. Based on the comparison result of the insulation resistance value of the low-voltage assembly with the predetermined insulation fault resistance value, it is possible to accurately determine the insulation status detection result of the low-voltage assembly, and to accurately determine whether an insulation fault exists in the low-voltage assembly.

[0016] In one embodiment, the step of detecting the insulation state of each high-voltage assembly and the energy storage system by the insulation detection module in accordance with the timing of applying a high voltage to each high-voltage assembly among the assemblies to be tested includes: performing an insulation detection operation after high voltage application to each high voltage assembly according to the timing of high voltage application to each high voltage assembly, thereby detecting the insulation state of each high voltage assembly; When the application of high voltage to any of the high voltage assemblies is completed and the insulation state detection of each high voltage assemblies is passed, performing insulation state detection on the energy storage system.

[0017] In the technical solution of the embodiments of the present application, 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 of each high-voltage assembly is short, so in the process of applying high voltage to each high-voltage assembly multiple times, the time for the insulation detection module to perform insulation detection on the high-voltage assemblies is also short. At the same time, the insulation resistance value corresponding to each high-voltage assemblies can be obtained by one insulation detection module. When the high voltage application to each high-voltage assemblies is completed and the insulation status detection of each high-voltage assemblies is passed, the insulation detection module can accurately perform insulation status detection on the energy storage system. This process allows one insulation detection module to instantly detect the insulation resistance value of each high-voltage assembly, reducing the number of interactions in the detection process and the complexity of the detection process of the high-voltage assemblies.

[0018] In one embodiment, the step of performing a post-high voltage insulation detection operation on each high voltage assembly comprises: controlling any one of the high-voltage assemblies to apply a high voltage to the high-voltage assembly, and obtaining an insulation resistance value after the application of the high voltage to the high-voltage assembly is completed by the insulation detection module; determining an 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; and 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 according to the high voltage application timing until the insulation state detection results of all the high voltage assemblies are obtained.

[0019] In the technical solution of the embodiments of the present application, for any one high-voltage assembly, a high voltage is controlled to be applied to the high-voltage assembly, and the insulation resistance value after the high voltage application to the high-voltage assembly is accurately obtained by the insulation detection module. The insulation resistance value after the high voltage application to the high-voltage assembly can be accurately determined based on the insulation resistance value after the high voltage application to the high-voltage assembly. If the insulation state detection of the high-voltage assembly passes, a high voltage is controlled to be applied 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. This is repeated multiple times to detect the insulation state of each high-voltage assembly, making the detection process of the high-voltage assemblies more standardized and the insulation state detection results of the high-voltage assemblies more accurate. At the same time, each high-voltage assemblies can be detected in real time by one insulation detection module, which reduces the detection cost and reduces the number of interactions and complexity in the detection process.

[0020] In one embodiment, the step of controlling the application of the high voltage to the high voltage assembly includes: Sending a high voltage application command to the high voltage assembly, instructing the high voltage assembly to turn off the internal relay according to the high voltage application command and complete the high voltage application; receiving a high voltage application completion command returned from the high voltage assembly and determining that high voltage application to the high voltage assembly is complete.

[0021] In the technical solution of the embodiment of the present application, a high voltage application command is sent to the high voltage assembly, so that the high voltage assembly turns off its internal relay according to the high voltage application command and instructs it 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. By sending a high voltage command to each high voltage assembly and receiving a high voltage completion command, the high voltage application can be more accurately performed according to the high voltage application timing of the high voltage assemblies, avoiding confusion in the order of the high voltage application process of each high voltage assembly. In the process of detecting the high voltage assemblies, there is no need 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 assemblies.

[0022] In one embodiment, the step of determining an insulation state detection result of the high voltage assembly based on an insulation resistance value after the application of the high voltage to the high voltage assembly is completed includes: 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 less than the insulation fault resistance value, determining that the insulation status detection result of the high-voltage assembly has an insulation fault; otherwise, determining that the insulation status detection of the high-voltage assembly has passed.

[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, if the insulation resistance value of the high-voltage assembly is smaller than the insulation fault resistance value, it is determined that the insulation status detection result of the high-voltage assembly has an insulation fault; otherwise, it is determined that the insulation status detection of the high-voltage assembly has passed. Based on the comparison result of the insulation resistance value of the high-voltage assembly with the predetermined insulation fault resistance value, it is possible to accurately determine the insulation status detection result of the high-voltage assembly, and to accurately determine whether an insulation fault exists in the high-voltage assembly.

[0024] In one embodiment, the step of performing insulation condition detection on the energy storage system comprises: Detecting an insulation resistance value of the energy storage system by an insulation detection module; and determining an 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 embodiments of the present application, when an energy storage system is detected by an insulation detection module, it is necessary to specifically distinguish the energy storage system. By using the insulation detection module to obtain and detect the insulation resistance value of the entire energy storage system, it can quickly determine whether 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 tested assembly, but also the entire energy storage system, thereby reducing the hardware cost of insulation detection of the energy storage system.

[0026] In one embodiment, the step of determining an insulation state detection result of the energy storage system based on an insulation resistance value of the energy storage system includes: comparing an 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, determining that the insulation status detection result of the energy storage system has an insulation fault; otherwise, determining that the insulation status 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 the predetermined insulation fault resistance value, if the insulation resistance value of the energy storage system is smaller than the insulation fault resistance value, it is determined that the insulation status detection result of the energy storage system has an insulation fault; otherwise, it is determined that the insulation status detection of the energy storage system has passed. Based on the comparison result of the insulation resistance value of the energy storage system with the predetermined insulation fault resistance value, it can be accurately determined that there is an insulation fault in the energy storage system.

[0028] In one embodiment, the method comprises: When the insulation state detection of the energy storage system indicates that there is an insulation failure, issuing a high voltage cut-off command to each high voltage assembly to instruct each high voltage assembly to perform a high voltage cut-off; After the high voltage cutoff for each high voltage assembly is completed, performing a post-high voltage insulation detection operation on each high voltage assembly to determine the detection result of the insulation state inspection for each high voltage assembly; The method further includes determining the high-voltage assembly that causes an insulation failure in the energy storage system based on the detection result of the insulation state inspection of each high-voltage assembly.

[0029] In the technical solution of the embodiments of the present application, if the insulation status detection of the energy storage system indicates an insulation fault, it indicates the existence of an insulation fault in the process of normal operation of the energy storage system, but it cannot be determined which tested assembly in the energy storage system has an insulation fault. A high-voltage shutdown command is issued to each high-voltage assembly to instruct each high-voltage assembly to perform high-voltage shutdown. After the high-voltage shutdown for each high-voltage assembly is completed, it is ensured that each tested assembly is in a low-voltage state, so that it can be determined whether an insulation fault exists in the low-voltage assembly. If no insulation fault appears in the low-voltage assemblies, an insulation detection operation after high voltage application is performed on each high-voltage assembly, so that the insulation resistance value corresponding to each high-voltage assembly can be obtained. Each high-voltage assembly can then be accurately tested based on the insulation resistance value, and the detection result of the insulation status test for each high-voltage assembly can be determined. Based on the detection result of the insulation status test for each high-voltage assembly, it can be accurately determined which high-voltage assembly causes the insulation fault in the energy storage system, thereby improving the accuracy of insulation status detection.

[0030] In one embodiment, before responding that the insulation detection module is in an on state, the method includes: The method further includes the step of sending an insulation detection on command to the insulation detection module to switch the insulation detection module to an on state when it detects that a low voltage has been applied to each assembly under test.

[0031] In the technical solution of the embodiment of the present application, when it is detected that a low voltage is applied to each assembly under test, an insulation detection on command is sent to the insulation detection module in a timely manner, and the insulation detection module is switched on. The insulation detection module is always on and will not be automatically turned off, so that the insulation resistance value of each assembly under test can be detected immediately during the entire process, avoiding the insulation detection module from being turned on and off multiple times, reducing the number of interactions during the detection process, and reducing the interaction complexity during the detection process.

[0032] In one embodiment, the method comprises: The method further includes a step of outputting, for any one of the assemblies under test, presentation information for instructing the assembly under test to inspect and maintain the assembly for insulation failure when the insulation status result of the assembly under test indicates that there is an insulation failure.

[0033] In the technical solution of the embodiment of the present application, if the insulation status result of any one of the tested assemblies indicates that there is an insulation fault, the information can be output to the technician in a timely manner, so that the technician can timely inspect and maintain the tested assembly for insulation faults to ensure the safe operation of the energy storage system.

[0034] In a second aspect, the present application provides an insulation condition detection system including a plurality of test assemblies and one insulation detection module, wherein the plurality of test assemblies and the insulation detection module are all communicatively connected to an energy management system, and each of the test assemblies and the insulation detection module is all connected in parallel to the same DC bus in the energy storage system; The energy management system further provides an insulation status detection system that is used to perform insulation status detection on each test assembly and the energy storage system in sequence by the insulation detection module in response to the insulation detection module being in an on state and in accordance with the voltage application and voltage cut-off timing of each test assembly.

[0035] In the technical solution of the embodiment of the present application, the energy management system is communicatively connected to a plurality of assemblies under test and one insulation detection module, and at the same time, the assemblies under test and the insulation detection modules are all connected in parallel to the same DC bus. This implementation simplifies the circuit connection relationship, and in the insulation status detection process, only one insulation detection module is used to detect the insulation status of the plurality of assemblies under test and the energy storage system, thereby reducing the hardware cost involved in the insulation status detection process. In addition, when detecting the insulation status of each assembly under test and the energy storage system, it is performed in accordance with the voltage application and voltage cut-off timing of each assembly under test. In this way, based on the simple circuit connection configuration, it is possible to sequentially detect the insulation status of each assembly under test and the energy storage system according to the set voltage application and voltage cut-off timing, reducing the interaction in the detection process, simplifying the insulation fault detection process of each assembly under test and the energy storage system, and reducing the complexity of the insulation fault detection process of the energy storage system.

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

[0037] In the technical solution of the embodiment of the present application, the energy management system is communicatively connected to a plurality of assemblies under test and one insulation detection module, and at the same time, the assemblies under test and the insulation detection modules are all connected in parallel to the same DC bus. This implementation simplifies the circuit connection relationship, and in the insulation status detection process, only one insulation detection module is used to detect the insulation status of the plurality of assemblies under test and the energy storage system, thereby reducing the hardware cost involved in the insulation status detection process. In addition, when detecting the insulation status of each assembly under test and the energy storage system, it is performed in accordance with the voltage application and voltage cut-off timing of each assembly under test. In this way, based on the simple circuit connection configuration, it is possible to sequentially detect the insulation status of each assembly under test and the energy storage system according to the set voltage application and voltage cut-off timing, reducing the interaction in the detection process, simplifying the insulation fault detection process of each assembly under test and the energy storage system, and reducing the complexity of the insulation fault detection process of the energy storage system.

[0038] In a fourth aspect, the present application provides a method for producing a method for manufacturing a pharmaceutical composition comprising: The present invention further provides an insulation status detection device including a detection module for performing insulation status detection on each test assembly and energy storage system in sequence by the insulation detection module in response to the insulation detection module being in an on state and in accordance with the timing of voltage application and voltage interruption of each test assembly.

[0039] In a fifth aspect, the present application further provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, implements the insulation state detection method described in any one of the first aspects.

[0040] In a sixth aspect, the present application further provides a computer program product, the computer program product including a computer program that, when executed by a processor, implements the insulation state detection method according to any one of the first aspects.

[0041] The above description is merely an outline of the technical solution of the present application. In order to make the technical solution of the present application more clearly understood, it can be implemented according to the content of the specification, and in order to make the above and other objectives, features and advantages of the present application more obvious and understandable, specific embodiments of the present application are given below. In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that need to be used in the embodiments of the present application will be briefly described below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without any creative efforts. [Brief explanation of the drawings]

[0042] [Figure 1] FIG. 1 is a schematic diagram of the architecture of a prior art energy storage system in one embodiment. [Figure 2] FIG. 1 is a schematic diagram of the architecture of the present energy storage system in one embodiment. [Figure 3] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 4] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 5] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 6] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 7] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 8] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 9] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 10] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 11] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 12]1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 13] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 14] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 15] 1 is a flowchart of an insulation state detection method according to an embodiment. [Figure 16] FIG. 1 is a schematic diagram of an architecture of an energy storage system in one embodiment. [Figure 17] FIG. 1 is a diagram illustrating the internal structure of a computer device according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0043] The following detailed description of the embodiments of the technical solution of the present application will be given with reference to the drawings. The following embodiments are merely for the purpose of more clearly illustrating the technical solution of the present application, and are therefore used as examples only, and should not be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. The terms used herein are only for describing specific examples and are not intended to limit the present application. The term "comprises" and any variations thereof in the specification, claims, and description of the drawings of this application are intended to cover the non-exclusive "comprises."

[0045] When referring to an "embodiment" in this specification, it means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. Appearances of this phrase in various places in the specification do not necessarily refer to the same embodiment, nor are they mutually exclusive, separate, or alternative embodiments to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in this specification can be combined with other embodiments.

[0046] With the continuous development of new energy technologies, various types of energy storage systems are increasingly applied in various fields, and the energy storage systems can provide electric energy to users during peak power consumption times or power outage periods. For example, the energy storage systems can include photovoltaic energy storage systems, wind energy storage systems, hydraulic energy storage systems, battery energy storage systems, etc.

[0047] However, various types of faults may occur in an energy storage system during use, for example, fault types may include thermal faults, electrical faults, and mechanical faults, and among electrical faults, insulation faults may cause safety accidents such as fires and explosions. In order to ensure the safe operation of the energy storage system, it is necessary to perform insulation detection on the devices inside the energy storage system to determine whether an insulation fault exists in the devices inside the energy storage system, thereby preventing the occurrence of safety accidents and ensuring the safe operation of the energy storage system.

[0048] 1 is a schematic diagram of the architecture of a prior art energy storage system, in which an energy storage system 11 includes multiple branches, each including an 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, the PCSs in the multiple branches are all connected to a power grid 12, and the BMSs are all connected to an energy management system (EMS) 13. To perform insulation detection for the BMS in each branch within the energy storage system 11, multiple insulation detection modules 14 are connected to each branch circuit, and each insulation detection module 14 can perform insulation detection for each branch circuit to determine whether an insulation fault exists in the branch circuit.

[0049] The applicant's research has found that in the related art, when multiple insulation detection modules 14 perform detection simultaneously, mutual interference will occur, and therefore the multiple insulation detection modules 14 need to be polled for on / off. That is, each time a detection is performed, the insulation detection module 14 in one branch circuit is turned on, and the insulation detection modules 14 in the other branch circuits are turned off. In such a case, the insulation detection module 14 in each branch circuit is turned on during detection and turned off after detection is completed. The EMS needs to simultaneously control the on / off of the multiple insulation detection modules 14, and the interaction between the multiple insulation detection modules 14 and the EMS during the detection process is very complex.

[0050] Based on this consideration, the applicant has studied the insulation detection method provided in the embodiments of the present application and found that by providing a single insulation detection module in the energy storage system and controlling the EMS to keep this single insulation detection module always on and 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 the PCS and BMS in the energy storage system using only one insulation detection module, the applicant connects the insulation detection module and assemblies such as the PCS and BMS in the energy storage system in parallel to the same DC bus and divides the detection time for each assembly, i.e., assemblies such as the PCS and BMS in the energy storage system operate independently at different time periods, thereby realizing the detection of different assemblies with a single insulation detection module. This process reduces the interaction in the detection process, simplifies the insulation fault detection process, and reduces the complexity of the insulation fault detection process for the energy storage system.

[0051] In some exemplary embodiments, the applicant has further found that, after research, each branch circuit in the energy storage system 11 of the prior art corresponds to one insulation detection module 14, and in the case of an energy storage system 11 with a small number of branch circuits, the number of insulation 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 insulation detection modules 14 is large, thus resulting in the problem of high hardware costs for insulation detection in the energy storage system 11.

[0052] Based on this consideration, the applicant has studied the insulation detection method provided by the embodiments 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 one insulation detection module can detect each assemblies connected in parallel to the same DC bus, thereby significantly reducing the number of insulation detection modules used and reducing the hardware cost input in the insulation status 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 application are not limited thereto, and other technical effects can also be achieved. For example, because the insulation detection module and assemblies such as the PCS and BMS in the energy storage system are all connected in parallel to the same DC bus, the line connection relationship within the energy storage system can be simplified, and even for energy storage systems with complex internal connections, the insulation detection needs of such energy storage systems can be better met.

[0054] The insulation state detection method provided by the embodiment of the present application is applied to the energy storage system 11. Based on this, before describing the insulation state detection method provided by the embodiment of the present application, the architecture of the energy storage system applied to the embodiment of the present application will first be described.

[0055] 2, which is a schematic architecture diagram of an energy storage system provided by an embodiment of the present application, in which multiple test assemblies 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 insulation detection module 22, the DC chopper 2112, the photovoltaic panel controller 212, and the energy storage inverter 213 are respectively connected in parallel to the same DC bus. The energy storage inverter 213 is respectively connected to the power grid 12 and the DC bus, and is used to convert AC current provided by the power grid 12 into DC current and 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 the communication method may be any one of CAN bus, Canbus communication, Modbus communication, RS485 communication, RS232 communication, or RS422 communication. The energy management system may be a computer-based insulation detection management module that has the function of collecting insulation data of each assembly in the energy storage system, analyzing based on the insulation data, and responding to control processes.

[0057] At the same time, the insulation detection module 22 and each of the assemblies under test are all connected in parallel to the same DC bus. The present application does not limit the parallel connection positions of the 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 assemblies under test may be provided in the center. Alternatively, the insulation detection module 22 may be provided in the center and the assemblies under test may be provided on both sides.

[0058] The insulation detection module 22 is used to obtain insulation parameter values ​​of each test assembly, which are used to characterize the insulation status of each test assembly. For example, the insulation parameters may include the leakage current value and insulation resistance value of each test assembly. The energy management system can send an insulation detection on command to the insulation detection module to control the insulation detection module to turn on detection. After the insulation detection module is turned on, the insulation detection module remains on at all times, eliminating the need for frequent switching during the detection process. The insulation parameter values ​​of the energy storage system and each test assembly can be immediately detected, and the obtained insulation parameters of each test assembly can be transmitted to the energy management system 13. After obtaining the insulation parameters of each test assembly, the energy management system 13 can perform insulation status detection for each test assembly based on the insulation parameters of each test assembly. After the energy management system has completed the insulation status detection 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, which turns off the detection of the insulation parameter values ​​of the energy storage system and each assembly under test after receiving the insulation detection off command. 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 obtain electric energy from the power grid or to discharge electric energy to the power grid, and includes an inverter 2131 (Direct Current / Alternating Current, DC / AC) and a control unit 2132. The inverter 2131 is used to convert direct current provided by the power grid into alternating current, and the control unit 2132 is used to receive control commands sent by the energy management system 13, charge or discharge the photovoltaic panel controller 212 or the battery management unit 2111 in the energy storage system 21 according to the control commands, and realize adjustment to the active power and reactive power of the power grid.

[0060] In some exemplary embodiments, the connection relationships between each assembly within the energy storage system can be changed as described above, and each assembly can be detected by one insulation detection module, and the energy management system 13 interacts with this one insulation detection module, thereby avoiding the interaction between the energy management system 13 and multiple insulation detection modules and reducing the complexity of the interaction process. At the same time, the use of one insulation detection module can also significantly reduce the hardware cost of insulation detection.

[0061] It is understood that the design of each structure within the energy storage system in the above embodiments is merely an example for realizing the technical effects of the present application, and that when actually applied, the structures may be adaptively modified to achieve easily conceivable technical effects, and that the embodiments of the present application do not limit the structures.

[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 applied to the above-mentioned FIG. 2, and all of them will be described with the energy management system 13 as the execution body.

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

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

[0065] During operation of the energy storage system, in order to ensure that the energy storage system can operate safely and stably, fault detection needs to be performed on the energy storage system according to a predetermined detection period. Before performing insulation state detection on the energy storage system and the test assemblies within the energy storage system, the insulation detection module is in an off state, and the energy management system needs to send an insulation detection on command to the insulation detection module. After receiving the insulation detection on command, the insulation detection module turns on detection of the insulation parameter values ​​of the energy storage system and each test assemblies.

[0066] When the insulation detection module is turned on, the energy management system controls each test assembly to apply and cut off voltage. During the voltage application and voltage cut-off process, the insulation detection module detects the insulation parameter values ​​of each test assembly and transmits the corresponding insulation parameter values ​​of each test assembly to the energy management system. The energy management system then determines the insulation status of each test assembly and the energy storage system based on the corresponding insulation parameter values ​​of each test assembly. The insulation status can include insulation failure and insulation normal. For example, if the insulation status detection for test assembly A passes, it indicates that there is no insulation failure in test assembly A, and the insulation parameter value of the test assembly is greater than a predetermined resistance value or is the same as the rated resistance value, thereby protecting the test assembly and ensuring the safety of the energy storage system. If the insulation status detection of the assembly A under test fails, it indicates that there is an insulation fault in the assembly A under test, and the insulation parameter value of the assembly under test is smaller than the predetermined resistance value, which means that the assembly under test cannot be protected, and the insulation fault may cause a safety accident such as fire or explosion in the energy storage system.

[0067] The voltage application and voltage cutoff timing refers to the order in which voltage is applied to and cut off from each test assembly in the energy storage system. If high or low voltage is not considered in the voltage application and voltage cutoff, the energy management system generally first controls each test assembly in the energy storage system to apply voltage according to a predetermined voltage application order, and may control each test assembly to apply voltage simultaneously. After voltage application to each test assembly is completed, the energy management system may control each test assembly to cut off voltage according to a predetermined voltage cutoff order, and may control each test assembly to cut off high voltage simultaneously.

[0068] Considering the high or low voltage of the voltage application and voltage cutoff, each test assembly can be divided into a low-voltage assembly and a high-voltage assembly. The energy management system first controls the low-voltage assembly to apply a low voltage. If it determines that there is no insulation fault in the low-voltage assembly, it can then control the high-voltage assembly to apply a high voltage according to a predetermined high-voltage application sequence, or control the high-voltage assembly to simultaneously apply a high voltage. If there is no insulation fault in the high-voltage assembly, it determines whether there is an insulation fault when the energy storage system operates normally. If there is no insulation fault, there is no need to cut off the high voltage. If there is an insulation fault, it controls the high-voltage assembly to cut off the high voltage according to the high-voltage cutoff sequence, or control the high-voltage assemblies to simultaneously cut off the high voltage. Furthermore, it sequentially checks which test assembly has an insulation fault when the energy storage system operates normally according to the above voltage application operations. For example, the low-voltage assembly can include a solar panel controller, DC-side equipment of a PCS, etc., and the high-voltage assembly can be a BMS in an electrical cabinet, DC / DC and AC-side equipment of a PCS in an electrical cabinet, etc.

[0069] It is understood that during the process of the insulation detection module detecting each test assembly according to the timing of voltage application and voltage interruption, the insulation parameter value obtained each time detection is performed may represent the insulation parameter value of a certain test assembly, the insulation parameter values ​​of several test assemblies, or the insulation parameter value of the entire energy storage system. For example, during the process of applying a low voltage to each test assembly, the insulation parameter value detected by the insulation detection module includes the common insulation parameter value of the photovoltaic panel controller and the DC side devices of the PCS, and during 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 devices of the PCS.

[0070] In the above insulation condition detection method, the energy management system is communicatively connected to a plurality of assemblies under test and one insulation detection module, and at the same time, the assemblies under test and the insulation detection modules are all connected in parallel to the same DC bus. This implementation simplifies the circuit connections, and in the insulation condition detection process, only one insulation detection module is used to detect the insulation conditions of the plurality of assemblies under test and the energy storage system, thereby reducing the hardware costs involved in the insulation condition detection process. In addition, when detecting the insulation condition of each assembly under test and the energy storage system, it is performed in accordance with the voltage application and voltage cut-off timing of each assembly under test. In this way, based on a simple circuit connection configuration, it is possible to sequentially check the insulation condition of each assembly under test and the energy storage system at the set voltage application and voltage cut-off timing, reducing interactions in the detection process and simplifying the insulation fault detection process of each assembly under test and the energy storage system, thereby reducing the complexity of the insulation fault detection process of the energy storage system.

[0071] Based on the above embodiment, this embodiment will introduce and explain the specific details of step S101 in the embodiment of Figure 3, "The insulation detection module sequentially detects the insulation status of each test assembly and the energy storage system according to the timing of voltage application and voltage interruption of each test assembly." As shown in Figure 4, the insulation status detection process can 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 based on the voltage to ground, and the boundary between high voltage and low voltage is 1000 volts (V) for AC voltage or 1500 V for DC voltage, with assemblies with AC voltages less than 1000 V or DC voltages less than 1500 V being low-voltage assemblies, and assemblies with AC voltages equal to or greater than 1000 V or DC voltages equal to or greater than 1500 V being high-voltage assemblies. For example, the low-voltage assemblies among the assemblies under test in the energy storage system may be a photovoltaic panel controller or DC-side equipment of a PCS, and the high-voltage assemblies among the assemblies under test may be an electrical cabinet, a BMS in an electrical cabinet, or AC-side equipment of a DC / DC and PCS in an electrical cabinet.

[0074] The low voltage application state indicates that each test assembly is in a low voltage application 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 test assemblies. The high voltage application timing refers to the order of high voltage application to the high voltage assemblies. For example, the high voltage application timing may be BMS, DC / DC, and DC / AC. That is, the energy management system first controls the BMS to apply a high voltage, and after the high voltage application to the BMS is completed, controls the DC / DC to apply a high voltage. After the high voltage application to the DC / DC is completed, the high voltage application operation for the entire electrical cabinet is completed. Finally, controls the DC / AC to apply a high voltage. After the high voltage application to the DC / AC is completed, the high voltage application for the entire energy storage system is completed.

[0075] When performing a low voltage application operation on each test assembly, in some exemplary embodiments, the MPPT discharge operation can charge the DC bus, and a low voltage can be provided to each test assembly. In some exemplary embodiments, if no voltage is stored in the MPPT, a voltage can be obtained from the power grid by DC / AC, and the DC bus can be charged, and a low voltage can be provided to each test assembly. The process of each test assembly performing a low voltage operation is performed autonomously, rather than by controlling the low voltage input by the energy management system.

[0076] In this embodiment, in the process of applying a low voltage to each test assembly, the insulation detection module can detect the insulation parameter value of the low-voltage assembly among each test assembly and send the insulation parameter value to the energy management system. After receiving the insulation parameter value, the energy management system determines whether each test assembly is in a low-voltage applied state.

[0077] In some exemplary embodiments, the energy management system can determine the past high voltage timing of the high voltage assemblies as the high voltage application timing of the high voltage assemblies. In some exemplary embodiments, the energy management system can order the high voltage assemblies according to the number of past insulation failures of each high voltage assembly, obtain the ordering result of the high voltage assemblies, and determine the ordering result as the voltage application timing of the high voltage assemblies. In this exemplary embodiment, the manner of obtaining the high voltage application timing of the high voltage assemblies is not limited.

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

[0079] During the process of applying a low voltage to each assembly under test, the insulation detection module can immediately obtain the insulation parameter value of each assembly under test. In this case, the insulation parameter value detected by the insulation detection module is the insulation parameter value of the low-voltage assembly among each assembly under test and the common insulation parameter value of the DC bus. Based on the insulation parameter value, the insulation status of the low-voltage assembly and the DC bus can be determined, i.e., whether a fault exists in the low-voltage assembly and the DC bus. If a fault exists, it can be determined that the fault exists in the low-voltage assembly or the DC bus, but it cannot be determined specifically whether the fault exists in the low-voltage assembly or the DC bus, and it cannot be determined which low-voltage assembly has the fault. After that, a technician must inspect the low-voltage assembly and the DC bus separately to determine the specific faulty assembly. In some exemplary embodiments, because the resistance of the DC bus is small, the DC bus can be ignored and it can be directly determined whether a fault exists in the low-voltage assembly.

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

[0081] After completing the low voltage application for each test assembly and determining that no faults exist in either the low-voltage assembly or the DC bus, the energy management system sequentially applies high voltage to the high-voltage assemblies according to the high-voltage application timing of each high-voltage assembly. The energy management system sequentially applies high voltage to each high-voltage assembly among the test assemblies according to the high-voltage application timing of each high-voltage assembly, and determines whether the insulation status detection of each high-voltage assembly passes, i.e., determines whether a fault exists in each high-voltage assembly. If it determines that no faults exist in either the low-voltage assembly or the high-voltage assembly among the test assemblies, the energy storage system is in a normal operating state, and the insulation detection module further obtains insulation parameter values ​​of the entire energy storage system and sends the insulation parameter values ​​of the energy storage system to the energy management system. The energy management system determines the insulation status of the energy storage system during normal operation based on the insulation parameter values ​​of the energy storage system, and can determine that a fault exists during normal operation of the energy storage system by detecting whether the insulation status detection of the energy storage system passes.

[0082] In the above insulation state detection method, the voltage application and voltage cut-off timing of each test assembly is divided into a low voltage application state and a high voltage application state of each test assembly. In this way, when the insulation detection module performs insulation state detection for each test assembly and the energy storage system, it can be further subdivided to instruct the detection logic in terms of the low voltage application state of each test assembly and the high voltage application timing of the high voltage assembly among each test assemblies. The voltage application timing of the energy storage system itself is to apply a low voltage first and then a high voltage, which is equivalent to setting the voltage application and voltage cut-off 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 for each test assembly and the energy storage system. In some exemplary embodiments, the high voltage application timing is the timing for the high voltage assemblies, and the high voltage is applied to the high voltage assemblies in a certain order, so that the insulation detection module sequentially detects the insulation status of the high voltage assemblies. This not only reduces the number of interactions in detecting the insulation status of the high voltage assemblies and reduces the complexity of detecting the insulation status of the high voltage assemblies, but also greatly shortens the time required to detect the insulation status of the high voltage assemblies, and improves the efficiency of the insulation status detection.

[0083] Based on the above embodiment, this embodiment will introduce and explain the specific content of "detecting the insulation state of each test assembly and the energy storage system in sequence by the insulation detection module according to the low voltage application state of each test assembly and the timing of high voltage application of the high voltage assembly among the test assemblies" in step S202 of the embodiment of Figure 4. As shown in Figure 5, the above S202 can include the following steps S301 to S302.

[0084] In S301, a low voltage is applied to each assembly under test, and then an insulation state detection is performed on the low voltage assembly among the assemblies under test by the insulation detection module.

[0085] In this embodiment, when a low voltage is provided to the DC bus by MPPT or the power grid, the insulation detection module acquires an insulation parameter value of each test assembly and transmits the acquired insulation parameter value to the energy management system. The energy management system can determine whether each test assembly is in an undervoltage state based on the insulation parameter value. After determining that each test assembly is in an undervoltage state, the energy management system can further determine the insulation status 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 low-voltage assembly's insulation status detection is successful, i.e., it is determined that there is no fault in the low-voltage assembly. If the insulation parameter value is not within the predetermined resistance range, the low-voltage assembly's insulation status detection is unsuccessful, i.e., it is determined that there is a fault in the low-voltage assembly.

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

[0087] If the insulation condition detection of the low voltage assembly passes and determines that no insulation fault exists in the low voltage assembly, the energy management system must perform insulation condition detection on each high voltage assembly of each tested assembly to determine whether an insulation fault exists in the high voltage assembly.

[0088] In this embodiment, for each high-voltage assembly, when the energy management system controls the application of a high voltage to the high-voltage assembly, the insulation detection module can obtain an insulation parameter value for the high-voltage assembly and transmit the insulation parameter value to the energy management system. After receiving the insulation parameter value, the energy management system performs insulation status detection for the high-voltage assembly. In this manner, insulation status detection can be performed for each high-voltage assembly. In the detection process of the insulation detection module, the common insulation parameter value of the high-voltage assembly and the DC bus is detected. Based on the insulation parameter value, the insulation status of the high-voltage assembly and the DC bus can be determined, i.e., whether a fault exists in the low-voltage assembly and the DC bus can be determined. In some exemplary embodiments, because the resistance of the DC bus is small, the DC bus can be ignored and whether a fault exists in the high-voltage assembly can be directly determined.

[0089] In the process of performing insulation state detection for each high-voltage assembly, if the insulation state detection for one or more high-voltage assemblies fails, it is understood that this indicates that an insulation fault exists in the corresponding high-voltage assembly. In order to detect the insulation state of all high-voltage assemblies, regardless of whether there is a high-voltage assembly that has failed before the current high-voltage assembly, it is necessary to control each current high-voltage assembly to perform insulation state detection, thereby determining whether there is an insulation fault in all high-voltage assemblies and specifically which high-voltage assemblies have an insulation fault.

[0090] In some exemplary embodiments, when the high voltage application operation for any of the high voltage assemblies of each test assembly is completed and no fault exists in any of the high voltage assemblies of each test assembly, the energy storage system is in a normal operating state, in which case the insulation detection module can obtain insulation parameter values ​​for the entire energy storage system and send the insulation parameter values ​​of the energy storage system to the energy management system, and the energy management system can determine the insulation state of the energy storage system based on the insulation parameter values, and can determine whether a fault exists in the test assembly in the energy storage system in the normal operating state of the energy storage system.

[0091] In the above-mentioned insulation state detection method, after applying a low voltage to each test assembly, the insulation state detection module can perform insulation state detection on the low-voltage assembly among the test assemblies, and if the insulation state detection of the low-voltage assembly passes, the insulation state detection module performs insulation state detection on each high-voltage assembly and the energy storage system according to the timing of applying a high voltage to each high-voltage assembly among the test assemblies. In the present application, the voltage application process is divided into low voltage application and high voltage application, and each test assembly is correspondingly divided 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 test assembly can be determined. In some exemplary embodiments, the insulation detection module further performs insulation state detection on multiple high voltage assemblies of each test assembly according to the timing of high voltage application of the high voltage assembly, thereby reducing the number of interactions in the low voltage application / high voltage application detection process of each test assembly and further reducing the complexity of the detection process of each test assembly.

[0092] Based on the above embodiment, this embodiment will introduce and explain the specific content of step S301 in the embodiment of Figure 5, "performing insulation state detection on the low-voltage assembly among the test assemblies by the insulation detection module." As shown in Figure 6, the above step S301 can include the following content.

[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 the low voltage assembly refers to the DC resistance value when a low voltage is applied.

[0095] In this embodiment, the low-voltage assembly among the test assemblies of the energy storage system may include MPPT and PCS DC side equipment. When a low-voltage input operation is performed on each test assembly, 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, and the energy management system can 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 some exemplary embodiments, the energy management system can determine whether the insulation resistance value of the low-voltage assembly is within a predetermined range. If the insulation resistance value is within the predetermined range, the insulation status detection result of the low-voltage assembly is determined to be pass, i.e., no fault exists in the low-voltage assembly. If the insulation resistance value is not within the predetermined range, the insulation status detection result of the low-voltage assembly is determined to be fail, i.e., a fault exists in the low-voltage assembly. In some exemplary embodiments, the energy management system can compare the insulation resistance value of the low-voltage assembly with a predetermined resistance value and determine the insulation status detection result of the low-voltage assembly based on the comparison result. In some exemplary embodiments, the energy management system can calculate an error value between the insulation resistance value of the low-voltage assembly and the predetermined resistance value and determine the insulation status detection result of the low-voltage assembly based on the error value and the predetermined error value. This embodiment does not limit the form in which the insulation status 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 low-voltage assemblies when detecting low-voltage assemblies. The insulation detection module can quickly detect the insulation resistance values ​​of all low-voltage assemblies. After obtaining the insulation resistance values ​​of the low-voltage assemblies in a timely manner, the insulation resistance values ​​of the low-voltage assemblies can be analyzed. The insulation state detection results of the low-voltage assemblies can be quickly determined, and the efficiency of the insulation detection results of the low-voltage assemblies can be improved.

[0099] In some exemplary embodiments, this embodiment introduces and describes the specific content of "determine the insulation state detection result of the low-voltage assembly based on the insulation resistance value of the low-voltage assembly" in step S402 in the embodiment of Figure 6. As shown in Figure 7, the above step S402 can include the following content:

[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, the 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 database of the energy management system. The predetermined insulation fault resistance value is a boundary line, and insulation resistance values ​​on one side of the insulation fault resistance value are normal resistance values, indicating that the low-voltage assembly is operating normally, and insulation resistance values ​​on the other side of the insulation fault resistance value are abnormal resistance values, 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 the insulation resistance value with the predetermined insulation fault resistance value to determine whether 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, it is determined that the insulation status detection result of the low-voltage assembly has an insulation fault; otherwise, it is determined that the insulation status detection of the low-voltage assembly is passed.

[0103] In this embodiment, a higher insulation resistance value of a low-voltage assembly indicates a higher insulation effect of the low-voltage assembly, and accordingly, a lower insulation resistance value of a low-voltage assembly indicates a poorer insulation effect of the low-voltage assembly. If 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 assemblies. However, it is not possible to determine which specific low-voltage assemblies are faulty based on the insulation resistance value and insulation fault resistance value of the low-voltage assemblies. In this case, a technician must inspect all low-voltage assemblies to determine which specific low-voltage assemblies have the fault. If the insulation resistance value of a low-voltage assembly is equal to or greater than the insulation fault resistance value, i.e., the low-voltage assembly insulation status detection has passed, it indicates that there is no insulation fault in any of the low-voltage assemblies and that the low-voltage assemblies can operate normally.

[0104] In the above-mentioned insulation condition 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, it is determined that the insulation condition detection result of the low-voltage assembly has an insulation fault; otherwise, it is determined that the insulation condition detection of the low-voltage assembly has passed. Based on the comparison result of the insulation resistance value of the low-voltage assembly with the predetermined insulation fault resistance value, it is possible to accurately determine the insulation condition detection result of the low-voltage assembly and whether an insulation fault exists in the low-voltage assembly.

[0105] Based on the above embodiment, this embodiment introduces and explains the specific content of step S302 in the embodiment of Figure 5, "detecting the insulation state of each high-voltage assembly and the energy storage system by the insulation detection module according to the timing of high voltage application to each high-voltage assembly among the assemblies under test." As shown in Figure 8, the above step S302 can include the following content.

[0106] In S601, an insulation detection operation is performed after high voltage application to each high voltage assembly in accordance with the timing of high voltage application to each high voltage assembly, thereby detecting the insulation state of each high voltage assembly.

[0107] In this embodiment, the energy management system can apply a high voltage to each high-voltage assembly according to the high-voltage application timing. When applying a high voltage to each high-voltage assembly, the insulation detection module can detect an insulation parameter value after applying a high voltage to each high-voltage assembly and send the insulation parameter value of the high-voltage assembly to the energy management system. The energy management system can determine whether the insulation state of each high-voltage assembly is acceptable based on the insulation parameter value. For example, if the high-voltage application timing of each high-voltage assembly is a BMS in an electrical cabinet, a DC / DC in the electrical cabinet, and a DC / AC in a PCS, the energy management system can first control the BMS in the electrical cabinet to apply a high voltage 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, so that the electrical cabinet consisting of the BMS and the DC / DC is connected in parallel to the DC bus. That is, the insulation detection module cannot obtain the insulation parameter value of the BMS in the electrical cabinet. After the high-voltage application to the BMS is completed, the energy management system can determine whether the DC / DC in the electrical cabinet is After the high voltage application to the DC / DC is completed, the insulation detection module obtains the common insulation parameter value of the BMS and the DC / DC in the electrical cabinet and sends the insulation parameter value to the energy management system. The energy management system determines whether the insulation status detection of the electrical cabinet is passed based on the insulation parameter value. Finally, the PCS controls to apply high voltage to the DC / AC. After the high voltage application to the DC / AC is completed, the insulation detection module obtains the insulation parameter value of the DC / AC and sends the insulation parameter value to the energy management system. The energy management system can determine whether the insulation status detection of the DC / AC is passed based on the insulation parameter value of the DC / AC.

[0108] In S602, if the application of high voltage to each of the high voltage assemblies is completed and the insulation state detection of each of the high voltage assemblies is passed, the insulation state detection is performed on the energy storage system.

[0109] In this embodiment, if the insulation status detection of a high-voltage assembly fails during the high-voltage application process of each high-voltage assembly, the insulation status detection of the corresponding energy storage system also fails. If the insulation detection results of all high-voltage assemblies pass, it is determined that the low-voltage and high-voltage assemblies among the assemblies under test are both normal. In this case, the energy management system needs to determine whether an insulation fault exists when the energy storage system operates normally after the high-voltage application of each high-voltage assemblies is completed, so as to ensure the normal operation of the energy storage system.

[0110] In some exemplary embodiments, after the high voltage application to each high-voltage assembly is completed and the energy storage system is operating normally, the insulation detection module obtains insulation parameter values ​​of all tested assemblies in the energy storage system and sends the insulation parameter values ​​to the energy management system. The energy management system can determine whether the insulation status detection of the energy storage system passes based on the insulation parameter values ​​during the normal operation of the energy storage system. If the insulation status detection passes, it indicates that there is no fault in each tested assembly inside the energy storage system. The entire energy storage system also operates normally. The insulation detection process is completed. If the insulation status detection fails, it indicates that a fault exists in a tested assembly inside the energy storage system during operation. It is necessary to first perform a high-voltage shutdown on each assembly in the energy storage system, and then check whether there is a fault in each tested assembly inside the energy storage system according to the timing of the high voltage application. Alternatively, it is also possible to manually check whether there is a fault in each tested assembly.

[0111] In the above insulation state detection method, in the process of applying a 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 therefore in the process of applying a high voltage to each high-voltage assembly multiple times, the time for the insulation detection module to perform insulation detection on the high-voltage assemblies is also short. At the same time, the insulation resistance value corresponding to each high-voltage assemblies can be obtained by one insulation detection module. When the high voltage application to each high-voltage assemblies is completed and the insulation state detection of each high-voltage assemblies is passed, the insulation detection module can accurately perform insulation state detection for the energy storage system. This process uses one insulation detection module to instantly detect the insulation resistance value of each high-voltage assembly, reduces the number of interactions in the detection process, reduces the complexity of the detection process for the high-voltage assemblies, and also avoids the insulation detection module from being turned on and off multiple times, improving the detection efficiency of the insulation detection module.

[0112] Based on the above embodiment, this embodiment will introduce and explain the specific content of step S601 "performing insulation detection operation after high voltage application to each high voltage assembly" in the embodiment of Figure 8. As shown in Figure 9, the above step S601 can include the following content:

[0113] In S701, a high voltage is applied to any one of the high voltage assemblies by controlling the high voltage assembly, and an insulation resistance value after the application of the high voltage to the high voltage assembly is completed is obtained by the insulation detection module.

[0114] In this embodiment, a 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. For each high-voltage assembly, the energy management system sends a high-voltage application command to the high-voltage assembly. After receiving the high-voltage application command, the high-voltage assembly turns off its internal relay, completing the high-voltage application operation for the high-voltage assembly. The insulation detection module can timely obtain the insulation resistance value after the high-voltage application for 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 high voltage application to the high voltage assembly is completed.

[0116] In this embodiment, the energy management system determines whether the insulation resistance value of the high-voltage assembly after the application of high voltage to the high-voltage assembly satisfies a predetermined condition, and determines the insulation status 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 the predetermined resistance value. If the predetermined condition is the predetermined insulation range, the energy management system determines whether the insulation resistance value of the high-voltage assembly is within the predetermined insulation range, and determines the insulation status 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 the predetermined insulation resistance value and determines the insulation status 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 the predetermined resistance value, the energy management system calculates the error value between the insulation resistance value of the high-voltage assembly and the predetermined resistance value, and determines the insulation status detection result of the high-voltage assembly based on the error value and the predetermined error value.

[0117] In S703, after the insulation state detection result of the high voltage assembly is obtained, control is performed to apply a 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.

[0118] In this embodiment, if the insulation resistance value satisfies the above-mentioned predetermined condition, the insulation status detection of the high-voltage assembly is passed, that is, it is determined that there is no fault in the high-voltage assembly; if the insulation resistance value is not within the predetermined range, the insulation status detection of the high-voltage assembly is failed, that is, it is determined that there is a fault in the high-voltage assembly.

[0119] It can be understood that, regardless of whether the insulation status detection of the high-voltage assembly is passed or not, after obtaining the insulation status detection result of the high-voltage assembly, the energy management system must control the high-voltage application operation of the next high-voltage assembly according to the high-voltage application timing, and determine the insulation status detection result of the next high-voltage assembly, that is, determine whether there is an insulation fault in the next high-voltage assembly. By analogy, the insulation status detection result of each high-voltage assembly is determined in turn according to the above method, and whether there is an insulation fault in each high-voltage assembly is determined.

[0120] In the above insulation status detection method, for any one high-voltage assembly, a high voltage is controlled to be applied to the high-voltage assembly, and the insulation detection module obtains the insulation resistance value after the high voltage application to the high-voltage assembly is completed. The insulation status detection result of the high-voltage assembly can be determined based on the insulation resistance value after the high voltage application to the high-voltage assembly is completed. If the insulation status detection of the high-voltage assembly passes, the control controls to apply a high voltage to the next high-voltage assembly according to the high voltage application timing until the insulation status detection results of all high-voltage assemblies are obtained. By repeating this process to detect the insulation status of each high-voltage assembly multiple times, the detection process of the high-voltage assemblies is made more standardized and the insulation status detection result of the high-voltage assemblies is made more accurate. At the same time, each high-voltage assemblies can be detected in real time by one insulation detection module, which reduces the detection cost and reduces the number of interactions and complexity in the detection process.

[0121] Based on the above embodiment, this embodiment will introduce and explain the specific content of "controlling to apply high voltage to the high voltage assembly" in step S701 in the embodiment of Figure 9. As shown in Figure 10, the above step S701 can include the following content:

[0122] In S801, a high voltage application command is sent to the high voltage assembly, and the high voltage assembly is instructed to turn off the internal relay according to the high voltage application command and complete the high voltage application.

[0123] In this embodiment, the energy management system and each high-voltage assembly are communicatively connected, and 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, and after receiving the high-voltage application command, the high-voltage assembly turns off its internal relay, completing the high-voltage application operation for the high-voltage assembly.

[0124] In S802, a high voltage application completion command is received from the high voltage assembly, and it is determined that the high voltage application to the high voltage assembly has been completed.

[0125] In this embodiment, after sending a high voltage application command to a high voltage assembly, if the energy management system 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, and 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, thereby sending 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, so that the high voltage assembly turns off its internal relay in accordance with the high voltage application command and instructs it 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. By sending a high voltage command to each high voltage assembly and receiving a high voltage completion command, high voltage application is performed according to the high voltage application timing of the high voltage assembly, thereby avoiding confusion in the order of the high voltage application process of each high voltage assembly. In the process of detecting the high voltage assemblies, there is no need to frequently turn on and off the insulation detection module, which reduces the number of interactions in the detection process and reduces the complexity of the detection process of the high voltage assemblies.

[0127] Based on the above embodiment, this embodiment will introduce and explain the specific content of step S702 in the embodiment of Figure 9, "determine 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." As shown in Figure 11, the above step S702 can include the following content.

[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, the predetermined insulation fault resistance value is a boundary line, and insulation resistance values ​​on one side of the insulation fault resistance value are normal resistance values, indicating that the high-voltage assembly is operating normally, and insulation resistance values ​​on the other side of the insulation fault resistance value are abnormal resistance values, 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 the insulation resistance value with the predetermined insulation fault resistance value to determine whether 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, it is determined that the insulation status detection result of the high-voltage assembly has an insulation fault; otherwise, it is determined that the insulation status detection of the high-voltage assembly is passed.

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

[0132] In the above insulation condition 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, it is determined that the insulation condition detection result of the high-voltage assembly has an insulation fault; otherwise, it is determined that the insulation condition detection of the high-voltage assembly has passed. Based on the comparison result of the insulation resistance value of the high-voltage assembly with the predetermined insulation fault resistance value, it is possible to accurately determine the insulation condition detection result of the high-voltage assembly and whether an insulation fault exists in the high-voltage assembly.

[0133] Based on the above embodiment, this embodiment will introduce and explain the specific content of step S602 "detecting the insulation state of the energy storage system" in the embodiment of Fig. 8. As shown in Fig. 12, the above step S602 can include the following content:

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

[0135] In this embodiment, when the application of low voltage to the low-voltage assembly among the assemblies under test is completed, the application of high voltage to the high-voltage assembly is completed, and there is no insulation fault in either the low-voltage assembly or the high-voltage assembly, the energy storage system is in a state of normal operation at high voltage, the insulation detection module can obtain 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 obtain 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 determines whether the insulation resistance value of the energy storage system satisfies a predetermined condition, and determines an insulation status detection result of the energy storage system 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 energy storage system and the predetermined resistance value. If the predetermined condition is the predetermined insulation range, the energy management system determines whether the insulation resistance value of the energy storage system is within the predetermined insulation range, and determines an insulation status detection result of the energy storage system based on the determination result. If the predetermined condition is the predetermined insulation threshold, the energy management system compares the insulation resistance value of the energy storage system with the predetermined insulation resistance value, and determines an insulation status detection result of the energy storage system based on the comparison result.

[0138] In the above insulation state detection method, when the energy storage system is detected by the 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 by the insulation detection module, it is possible to quickly determine whether 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 tested assembly but also the entire energy storage system, thereby reducing the hardware cost of insulation detection of the energy storage system.

[0139] Based on the above embodiment, this embodiment will introduce and explain the specific content of step S1002 in the embodiment of Fig. 12, "determine the insulation state detection result of the energy storage system based on the insulation resistance value of the energy storage system." As shown in Fig. 13, the above step S1002 can include the following content:

[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, the predetermined insulation fault resistance value is a boundary line, and the 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 the 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 the insulation resistance value with the predetermined insulation fault resistance value to determine whether 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, it is determined that the insulation status detection result of the energy storage system has an insulation fault; otherwise, it is determined that the insulation status detection of the energy storage system is passed.

[0143] In this embodiment, if the insulation resistance value of the energy storage system is smaller than the insulation fault resistance value, it indicates that an insulation fault exists in a test assembly in the energy storage system during normal operation of the energy storage system, but it is not possible to determine which specific test assembly has an insulation fault, and fault detection must be performed again on the test assembly in the energy storage system at low voltage and high voltage.If the insulation resistance value of the energy storage system is equal to or greater than the insulation fault resistance value, the insulation status detection of the energy storage system passes, indicating that there is no insulation fault in the energy storage system and the energy storage system is operating 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, it is determined that the insulation state detection result of the energy storage system has an insulation fault; otherwise, it is determined that the insulation state detection of the energy storage system has passed. Based on the comparison result of the insulation resistance value of the energy storage system with the predetermined insulation fault resistance value, it is possible to accurately determine the insulation state detection result of the energy storage system and whether an insulation fault exists in the energy storage system.

[0145] Based on the above embodiment, this embodiment introduces and describes the specific contents of testing each test assembly 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 can further include the following contents:

[0146] In S1201, if the insulation state detection of the energy storage system indicates that there is an insulation failure, a high voltage cut-off command is issued to each high voltage assembly, instructing each high voltage assembly to perform high voltage cut-off.

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

[0148] In S1202, after the high voltage cutoff for each high voltage assembly is completed, an insulation detection operation after high voltage application is performed for each high voltage assembly, thereby determining the detection result of the insulation state inspection for each high voltage assembly.

[0149] In this embodiment, after the high-voltage cut-off operation for each high-voltage assembly is performed, the high-voltage cut-off completion operation is fed back to the energy management system. In this case, each test assembly in the energy storage system is in a low-voltage state, and the insulation detection module detects the insulation resistance value of the low-voltage assembly and sends the insulation resistance value to the energy management system. The energy management system can determine whether an insulation fault exists in the low-voltage assembly based on the insulation resistance value of the low-voltage assembly. If it is determined that an insulation fault does not exist in the low-voltage assembly, the energy management system controls each high-voltage assembly to perform a high-voltage application operation in turn, and detects the insulation resistance value of each high-voltage assembly using the insulation detection module. Based on the insulation resistance value of each high-voltage assembly, it determines the detection result of the insulation state test for each high-voltage assembly.

[0150] In S1203, the high-voltage assembly causing the insulation failure of the energy storage system is determined based on the detection result of the insulation state inspection of each high-voltage assembly.

[0151] In this embodiment, in the insulation status detection process of each high-voltage assembly, if any one or more of the insulation status detections of each high-voltage assembly fails, it is determined that an insulation fault exists in the high-voltage assembly corresponding to the insulation status, that is, no insulation fault exists 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 status detection method, if the insulation status detection of the energy storage system indicates an insulation fault, it indicates the existence of an insulation fault during the normal operation of the energy storage system, but it is not possible to determine which assembly in the energy storage system is experiencing the insulation fault. A high-voltage shutdown command is issued to each high-voltage assembly, instructing each high-voltage assembly to perform high-voltage shutdown. After the high-voltage shutdown for each high-voltage assembly is completed, it is ensured that each tested assembly is in a low-voltage state, so that it can be determined whether an insulation fault exists in the low-voltage assembly. If no insulation fault exists in the low-voltage assemblies, an insulation detection operation after high voltage application is performed on each high-voltage assembly, so that an insulation resistance value corresponding to each high-voltage assembly can be obtained. Each high-voltage assembly can then be accurately tested based on the insulation resistance value, and the detection result of the insulation status test for each high-voltage assembly can be determined. Based on the detection result of the insulation status test for each high-voltage assembly, it is possible to accurately determine which high-voltage assembly is causing the insulation fault in the energy storage system, thereby improving the accuracy of insulation status detection.

[0153] Based on the above embodiment, this embodiment introduces and describes the specific content of turning off the insulation detection module. The above method may further include sending an insulation detection on command to the insulation detection module to switch the insulation detection module on when detecting that a low voltage is applied to each test assembly.

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

[0155] In the above insulation state detection method, when it is detected that a low voltage is 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 on. The insulation detection module is always on and will not automatically turn off, so that the insulation resistance value of each assembly under test can be detected immediately throughout the entire process, avoiding the insulation detection module from being turned on and off multiple times, reducing the number of interactions during the detection process, and reducing the complexity of interactions during the detection process.

[0156] Based on the above embodiment, this embodiment will introduce and describe specific content for suggesting that the assembly under test be inspected and maintained if an insulation fault exists. The above method may further include outputting, for any one of the assemblies under test, prompting information for instructing the assembly under test to inspect and maintain the insulation fault if the insulation status result of the assembly under test indicates an insulation fault.

[0157] In this embodiment, if it is determined that an insulation fault exists in any one of the test assemblies in the energy storage system, the energy management system outputs a presentation to the technician, including the specific test assembly and whether the insulation fault was detected during voltage application to the test assembly or during the safe operation of the energy storage system. The presentation may be in the form of audio, text, or a combination of audio and text.

[0158] In the above insulation condition detection method, if the insulation condition result of any one of the tested assemblies indicates that there is an insulation fault, information can be output to a technician in a timely manner, so that the technician can timely inspect the tested assembly for insulation faults and perform maintenance to ensure the safe operation of the energy storage system.

[0159] In an embodiment, as shown in FIG. 15, an embodiment of an 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 insulation detection ON command is sent to the insulation detection module to switch the insulation detection module to an ON state.

[0161] In S1302, in response to the insulation detection module being in an on state, an 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 yes, it is determined that 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 that there is an insulation fault.

[0164] In S1305, if not, determine that the low voltage assembly insulation status detection is passed, and execute step S1306.

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

[0166] In S1307, a high voltage application completion command is received from the high voltage assembly, and it is determined that the high voltage application to the high voltage assembly has been completed.

[0167] In S1308, the insulation resistance value after the application of the high voltage to the high voltage assembly is obtained by the insulation detection module.

[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 yes, it is determined that the insulation resistance value of the high voltage assembly is less than the insulation fault resistance value, and the insulation state detection result of the high voltage assembly is that there is an insulation fault.

[0170] In S1311, if not, determine that the high voltage assembly insulation status detection is passed, and execute step S1312.

[0171] In S1312, the insulation resistance value of the energy storage system is detected by an 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] If so in S1314, it is determined that the insulation resistance value of the energy storage system is less than the insulation fault resistance value, and the insulation state detection result of the energy storage system indicates that there is an insulation fault, and step S1316 is executed.

[0174] Otherwise, in S1315, determine that the energy storage system insulation status detection has passed.

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

[0176] In S1317, after the high voltage cutoff for each high voltage assembly is completed, an insulation detection operation after high voltage application is performed for each high voltage assembly, thereby determining the detection result of the insulation state inspection for each high voltage assembly.

[0177] In S1318, the high-voltage assembly causing the insulation failure of the energy storage system is determined based on the detection result of the insulation state inspection of each high-voltage assembly.

[0178] In S1319, if the insulation state result of any one of the test assemblies indicates that there is an insulation failure, presentation information is output to instruct the test assembly to inspect and maintain the insulation failure.

[0179] In the above insulation condition detection method, the energy management system is communicatively connected to a plurality of assemblies under test and one insulation detection module, and at the same time, the assemblies under test and the insulation detection modules are all connected in parallel to the same DC bus. This implementation simplifies the circuit connections, and in the insulation condition detection process, only one insulation detection module is used to detect the insulation conditions of the plurality of assemblies under test and the energy storage system, thereby reducing the hardware costs involved in the insulation condition detection process. In addition, when detecting the insulation condition of each assembly under test and the energy storage system, it is performed in accordance with the voltage application and voltage cut-off timing of each assembly under test. In this way, based on a simple circuit connection configuration, it is possible to sequentially check the insulation condition of each assembly under test and the energy storage system at the set voltage application and voltage cut-off timing, reducing interactions in the detection process and simplifying the insulation fault detection process of each assembly under test and the energy storage system, thereby reducing the complexity of the insulation fault detection process of the energy storage system.

[0180] Although the steps in the flowcharts according to the above embodiments are shown in order according to the direction of the arrows, it should be understood that these steps are not necessarily performed in the order indicated by the arrows. Unless explicitly stated otherwise in this specification, there are no strict restrictions on the order in which these steps are performed, and these steps may be performed in other orders. Furthermore, at least some of the steps in the flowcharts according to the above embodiments may include multiple steps or multiple stages, and these steps or stages do not necessarily have to be completed at the same time but can be performed at different times. The order in which these steps or stages are performed does not necessarily have to be sequential, and they may be performed in order or alternately with other steps or at least some of the steps or stages in other steps.

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

[0182] In one embodiment, as shown in FIG. An insulation state detection device is provided that includes a detection module 161 for sequentially detecting the insulation state of each test assembly and energy storage system by the insulation detection module in response to the insulation detection module being in an on state and in accordance with the timing of voltage application and voltage interruption of each test assembly.

[0183] In one embodiment, the detection module 161: 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 each test assembly; and a detection unit for sequentially detecting the insulation state of each test assembly and the energy storage system by the insulation detection module in accordance with the low voltage application state of each test assembly and the timing of high voltage application of the high voltage assembly among the test assemblies.

[0184] In one embodiment, the detection unit applies a low voltage to each of the test assemblies, and then performs insulation state detection on the low-voltage assembly among the test assemblies using an insulation detection module; If the insulation state detection of the low-voltage assembly passes, the insulation state 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 each test assembly.

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

[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; If the insulation resistance value of the low-voltage assembly is less than the insulation fault resistance value, it is used to determine that the insulation status detection result of the low-voltage assembly has an insulation fault; otherwise, it is used to determine that the insulation status detection of the low-voltage assembly has passed.

[0187] In one embodiment, the detection unit further performs 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, thereby detecting the insulation state of each high voltage assembly; When the application of high voltage to any of the high voltage assemblies is completed and the insulation state detection of each of the high voltage assemblies is passed, it is used to perform insulation state detection on the energy storage system.

[0188] In one embodiment, for any one of the high-voltage assemblies, the detection unit further controls to apply a high voltage to the high-voltage assembly, and obtains an insulation resistance value after the application of the high voltage to the high-voltage assembly is completed through the insulation detection module; determining an 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; After obtaining the insulation state detection result of the high voltage assembly, it 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 results of all the high voltage assemblies are obtained.

[0189] In one embodiment, the detection unit further sends a high voltage application command to the high voltage assembly, instructing the high voltage assembly to turn off the internal relay according to the high voltage application command and complete the high voltage application; It receives a high voltage application completion command returned from the high voltage assembly and is used to determine that the high voltage application to the high voltage assembly is complete.

[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; If the insulation resistance value of the high-voltage assembly is less than the insulation fault resistance value, it is used to determine that the insulation status detection result of the high-voltage assembly has an insulation fault; otherwise, it is used to determine that the insulation status detection of the high-voltage assembly has passed.

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

[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 the insulation status detection result of the energy storage system has an insulation fault; otherwise, it is used to determine that the insulation status detection of the energy storage system has passed.

[0193] In one embodiment, when the insulation state detection of the energy storage system indicates that there is an insulation fault, the detection unit further issues a high voltage cut-off command to each high voltage assembly to instruct each high voltage assembly to perform high voltage cut-off; After the high voltage cutoff for each high voltage assembly is completed, perform an insulation detection operation after high voltage application for each high voltage assembly to determine the detection result of the insulation state inspection for each high voltage assembly; Based on the detection result of the insulation condition inspection of each high voltage assembly, it is used to determine the high voltage assembly that causes the insulation failure of the energy storage system.

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

[0195] In one embodiment, for any one of the test assemblies, the detection unit is further used to output presentation information to instruct the test assembly to inspect and maintain the insulation fault when the insulation status result of the test assembly indicates that there is an insulation fault.

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

[0197] In one embodiment, a computer device is provided, which may be a server, and its internal structure may be as shown in FIG. 17. The computer device includes a processor, a 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 an internal memory. An operating system, a computer program, and a database are stored in the non-volatile storage medium. The internal memory provides an environment for the execution of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data in an insulation condition detection process. The network interface of the computer device is used to connect and communicate with an external terminal via a network. The computer program, when executed by the processor, implements the insulation condition detection method.

[0198] As will be understood by those skilled in the art, the structure shown in FIG. 17 is merely a structural block diagram of the parts related to the technical solution of the present application, and does not limit the computer device to which the technical solution of the present application is applied; a specific computer device may include more or fewer components than those shown, or may combine some components, or may have a different component arrangement.

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

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

[0201] In one embodiment, there is provided a computer program product comprising a computer program which, when executed by a processor, implements the method steps of any one of the above insulation state detection method embodiments.

[0202] As will be understood by those skilled in the art, all or part of the processes in the methods described above can be achieved by instructing associated hardware using a computer program. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the methods described above. Any reference to memory, database, or other media used in the embodiments provided herein can include at least one of non-volatile memory and volatile memory. Non-volatile memory can 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 can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The processor according to the embodiments provided herein may be, but is not limited to, a general purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc.

[0203] Finally, it should be noted that the above embodiments are merely intended to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art will understand that the technical solutions described in the above embodiments may still be modified or equivalently substituted for some or all of their technical features. Such modifications and substitutions do not deviate from the substance of the corresponding technical solutions within 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 the description of the present application. In particular, as long as there is no structural conflict, all technical features mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed in the description, but includes all technical solutions within the scope of the claims. [Explanation of symbols]

[0204] 11 Energy Storage Systems 111 Energy Storage Inverter 112 Battery Management System 12 Power grid 13 Energy Management System 14 Multiple Insulation Detection Modules 21 Energy Storage Systems 211 Electrical Cabinet 2111 Battery Management System 2112 DC chopper 212 Photovoltaic Panel Controller 213 Energy Storage Inverter 2131 Inverter 2132 Control Unit 22 Insulation Detection Module

Claims

1. An insulation state detection method applicable to an energy management system, the energy management system being communicatively connected to a plurality of test assemblies and one insulation detection module, the test assemblies and the insulation detection modules being connected in parallel to the same DC bus, the method comprising: An insulation status detection method including a step of, in response to the insulation detection module being in an on state, sequentially detecting the insulation status of each of the test assemblies and the energy storage system by the insulation detection module in accordance with the timing of voltage application and voltage interruption of each of the test assemblies.

2. the voltage application / voltage cutoff timing includes a low voltage application state and a high voltage application timing, and the step of sequentially detecting the insulation state of each of the test assemblies and the energy storage system by the insulation detection module according to the voltage application / voltage cutoff timing of each of the test assemblies includes: acquiring a low voltage application state of each of the test assemblies and a high voltage application timing of a high voltage assembly among the test assemblies; 2. The method of claim 1, further comprising: a step of performing insulation state detection for each of the test assemblies and the energy storage system in sequence by the insulation detection module in accordance with the low voltage application state of each of the test assemblies and the high voltage application timing of a high voltage assembly among the test assemblies.

3. the step of detecting an insulation state of each of the test assemblies and the energy storage system by the insulation detection module in sequence according to a low voltage application state of each of the test assemblies and a high voltage application timing of a high voltage assembly among the test assemblies, applying a low voltage to each of the test assemblies, and then performing insulation state detection on a low voltage assembly among the test assemblies by the insulation detection module; 3. The method of claim 2, further comprising: if the insulation status detection of the low-voltage assembly passes, performing insulation status detection on each of the high-voltage assemblies and the energy storage system by the insulation detection module according to the high-voltage application timing of each high-voltage assembly in each of the test assemblies.

4. The step of performing insulation state detection on a low voltage assembly of each of the test assemblies by the insulation detection module includes: obtaining an insulation resistance value of the low-voltage assembly detected by the insulation detection module; and determining an insulation state detection result of the low voltage assembly based on an insulation resistance value of the low voltage assembly.

5. The step of determining an insulation state detection result of the low-voltage assembly based on an insulation resistance value of the low-voltage assembly includes: comparing the insulation resistance value of the low voltage assembly with a predetermined insulation fault resistance value; 5. The method of claim 4, further comprising: determining that the insulation status detection result of the low-voltage assembly indicates an insulation failure if the insulation resistance value of the low-voltage assembly is less than the insulation fault resistance value; and determining that the insulation status detection of the low-voltage assembly is passed if the insulation resistance value of the low-voltage assembly is equal to or greater than the insulation fault resistance value.

6. The step of detecting an insulation state of each of the high-voltage assemblies and the energy storage system by the insulation detection module in accordance with a high-voltage application timing of each of the high-voltage assemblies in each of the test assemblies includes: performing an insulation detection operation after high voltage application to each of the high voltage assemblies in accordance with a high voltage application timing of each of the high voltage assemblies, thereby detecting an insulation state of each of the high voltage assemblies; and when high voltage application to any of the high voltage assemblies is completed and insulation state detection for each of the high voltage assemblies is passed, performing insulation state detection on the energy storage system.

7. the step of performing a post-high voltage insulation detection operation on each of the high voltage assemblies comprises: controlling any one of the high-voltage assemblies to apply a high voltage to the high-voltage assembly, and obtaining an insulation resistance value after the application of the high voltage to the high-voltage assembly is completed by the insulation detection module; determining an insulation state detection result of the high voltage assembly based on an insulation resistance value after the application of a high voltage to the high voltage assembly is completed; 7. The method of claim 6, further comprising: after obtaining the insulation state detection result of the high voltage assembly, controlling the application of a high voltage to a high voltage assembly next to the high voltage assembly in accordance with the high voltage application timing until the insulation state detection results of all high voltage assemblies are obtained.

8. The step of controlling the application of a high voltage to the high voltage assembly comprises: sending a high voltage application command to the high voltage assembly, instructing the high voltage assembly to turn off an internal relay according to the high voltage application command and complete high voltage application; receiving a high voltage application completion command returned from the high voltage assembly and determining that high voltage application to the high voltage assembly is complete.

9. The step of determining an insulation state detection result of the high voltage assembly based on an insulation resistance value after completion of high voltage application to the high voltage assembly includes: comparing the insulation resistance value of the high voltage assembly with a predetermined insulation fault resistance value; 8. The method of claim 7, further comprising: determining that the insulation status detection result of the high-voltage assembly indicates an insulation failure if the insulation resistance value of the high-voltage assembly is less than the insulation fault resistance value; and determining that the insulation status detection of the high-voltage assembly is passed if the insulation resistance value of the high-voltage assembly is greater than or equal to the insulation fault resistance value.

10. The step of performing insulation condition detection on the energy storage system comprises: detecting an insulation resistance value of the energy storage system by the insulation detection module; and determining an insulation state detection result of the energy storage system based on an insulation resistance value of the energy storage system.

11. The step of determining an insulation state detection result of the energy storage system based on an insulation resistance value of the energy storage system includes: comparing an insulation resistance value of the energy storage system with a predetermined insulation fault resistance value; 11. The method of claim 10, comprising: determining that the insulation status detection result of the energy storage system has an insulation fault if the insulation resistance value of the energy storage system is less than the insulation fault resistance value; and determining that the insulation status 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.

12. The method comprises: When the insulation state detection of the energy storage system indicates that there is an insulation failure, issuing a high voltage cut-off command to each of the high voltage assemblies to instruct each of the high voltage assemblies to perform a high voltage cut-off; After the high voltage cutoff for each of the high voltage assemblies is completed, performing the post-high voltage insulation detection operation for each of the high voltage assemblies to determine the detection result of the insulation state inspection for each of the high voltage assemblies; The method of claim 6, further comprising: determining a high-voltage assembly that causes an insulation failure in the energy storage system based on a detection result of an insulation condition inspection of each of the high-voltage assemblies.

13. The step of determining a high-voltage assembly that causes an insulation failure of the energy storage system based on the detection result of the insulation state inspection of each of the high-voltage assemblies includes:

13. The method of claim 12, further comprising: if at least one insulation state detection of each of the high voltage assemblies fails, determining the high voltage assembly whose detection fails as the high voltage assembly causing an insulation failure of the energy storage system.

14. Prior to the step of responding that the insulation detection module is in an on state, the method further comprises: The method according to any one of claims 1 to 5, further comprising the step of sending an insulation detection on command to the insulation detection module to switch the insulation detection module to the on state when it is detected that a low voltage has been applied to each of the test assemblies.

15. The method comprises: The method according to any one of claims 1 to 5, further comprising the step of outputting, for any one of the test assemblies, when the insulation condition result of the test assembly indicates that there is an insulation fault, suggesting that the test assembly be inspected and maintained for the insulation fault.

16. An insulation condition detection system including a plurality of test assemblies and an insulation detection module, wherein the plurality of test assemblies and the insulation detection module are all communicatively connected to an energy management system, and each of the test assemblies and the insulation detection module is all connected in parallel to the same DC bus in an energy storage system; The energy management system is an insulation status detection system that is used to perform insulation status detection on each of the test assemblies and the energy storage system in sequence using the insulation detection module in response to the insulation detection module being in an on state, depending on the timing of voltage application and voltage interruption to each of the test assemblies.

17. 17. An energy storage system including the insulation condition detection system of claim 16.

18. An insulation status detection device including a detection module that, in response to the insulation detection module being in an on state, performs insulation status detection on each of the test assemblies and the energy storage system in sequence using the insulation detection module in accordance with the timing of voltage application and voltage interruption to each test assembly in the energy storage system.

19. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any one of claims 1 to 15.

20. A computer program product comprising a computer program which, when executed by a processor, implements the steps of the method according to any one of claims 1 to 15.

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