Flow battery energy storage system fault positioning method, system, equipment and medium

Abstract

The invention relates to a flow battery energy storage system fault positioning method, system and device and a medium. The positioning method comprises the following steps: acquiring an insulation resistance value detected by each insulation resistance measuring point; system abnormity is determined through the insulation resistance value, and a plurality of detection circuit switches needing to be cut off in the circuit switches are determined; switching off each detection circuit switch, and dividing the flow battery energy storage system into a plurality of units which are not connected with one another; and reacquiring the insulation resistance value detected by the insulation resistance measuring point in each unit, and determining the fault position according to the comparison result of each reacquiring insulation resistance value and the preset standard resistance value. According to the scheme, the insulation resistance measuring point and the circuit switch are arranged, and when the insulation resistance is detected to be abnormal, the fault position in the flow battery energy storage system can be quickly and accurately positioned by using a historical data and division measurement method, so that the efficiency of troubleshooting and repairing is greatly improved, and the stable operation of the system is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of power station operation, and in particular relates to a method, system, electronic device and storage medium for locating a fault of a flow battery energy storage system. Background Art

[0002] Liquid flow batteries are currently widely used in wind farms, photovoltaic power stations, power peak regulation and other scenarios. They have the advantages of long energy storage time, high safety, long life, abundant raw materials, convenient capacity expansion, and the cost per kilowatt-hour decreases with the increase of capacity. They have become one of the main directions of commercialization in the field of long-term energy storage batteries, and are of great significance to the realization of my country's energy transformation, energy security and other goals.

[0003] The structure of the liquid flow battery energy storage system is relatively complex, with many devices, and it is difficult to detect and locate faults. The reduction in insulation resistance of the liquid flow battery energy storage system is mainly related to faults such as electrolyte leakage and equipment damage. At the same time, the abnormal reduction in insulation resistance may also affect the operation and efficiency of the liquid flow battery energy storage system, and even damage the liquid flow battery energy storage system.

[0004] In the liquid flow battery energy storage system, the battery stack is connected to the load or power supply in series or parallel through a bidirectional energy storage inverter and a bidirectional DC converter. The electrolyte is pumped from the storage tank to each battery stack through a pipeline. The electrolyte circulation path is long and there is a possibility of leakage wherever the electrolyte reaches. The existing insulation resistance detection and fault location systems and methods require manual operation and judgment, and there are safety risks such as electric shock. Human factors may affect the detection results or cause new faults. The detection efficiency is low and the detection speed is slow. As a result, the system may be shut down for a long time in the process of troubleshooting insulation abnormalities and finding the fault location, resulting in increased system energy consumption and self-discharge, and reduced battery capacity and equipment life. Summary of the invention

[0005] To solve the above problems, the present disclosure provides a method, system, electronic device and storage medium for locating faults in a flow battery energy storage system. This solution can quickly and accurately locate the fault location in the flow battery energy storage system, thereby greatly improving the efficiency of fault detection and repair and ensuring the stable operation of the system.

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a method for locating a fault of a flow battery energy storage system, the method comprising:

[0007] The liquid flow battery energy storage system is provided with a plurality of insulation resistance measuring points and a plurality of circuit switches for dividing the liquid flow battery energy storage system into mutually unconnected units; the positioning method comprises:

[0008] Obtaining the insulation resistance value detected by each of the insulation resistance measuring points;

[0009] When any of the insulation resistance values ​​is abnormal, the system is determined to be abnormal, and a plurality of detection circuit switches that need to be cut off in each of the circuit switches are determined based on the abnormal insulation resistance value, the historical fault insulation resistance value, and the corresponding historical fault location data;

[0010] Cut off each of the detection circuit switches to divide the flow battery energy storage system into a plurality of unconnected units; each unit includes at least one of the insulation resistance measurement points;

[0011] The insulation resistance value detected by the insulation resistance measuring point in each unit is re-obtained, and the fault location is determined according to the comparison result between each re-obtained insulation resistance value and a preset standard resistance value.

[0012] According to a preferred embodiment of the present invention, the method of determining a plurality of detection circuit switches that need to be cut off in each circuit switch by using the abnormal insulation resistance value, the historical fault insulation resistance value and the corresponding historical fault location data includes:

[0013] Obtain abnormal historical fault insulation resistance detection values ​​and corresponding historical fault locations in historical data;

[0014] Taking the abnormal historical fault insulation resistance detection value and the corresponding historical fault location as samples, a fault prediction model for predicting the fault location is constructed;

[0015] Obtaining a predicted fault location according to the abnormal insulation resistance detection value and the fault prediction model;

[0016] A plurality of the detection circuit switches that need to be disconnected are determined in each of the circuit switches according to the predicted fault position.

[0017] According to a preferred embodiment of the present invention, the determining of the fault location according to the comparison result of each of the re-acquired insulation resistance values ​​with the preset standard resistance value includes:

[0018] When each of the reacquired insulation resistance values ​​is greater than or equal to the preset standard resistance value, it is determined that a connection failure exists in the circuit where each of the detection circuit switches is located.

[0019] According to a preferred embodiment of the present invention, determining the fault location according to the comparison result of each of the re-acquired insulation resistance values ​​and the preset standard resistance value includes:

[0020] When any first insulation resistance value is less than the preset standard resistance value, a unit corresponding to a first insulation resistance measuring point whose insulation resistance value is less than the preset standard resistance value is used as a detection unit; the first insulation resistance measuring point is an insulation resistance measuring point of the circuit system, and the first insulation resistance value is an insulation resistance value detected by the first insulation resistance measuring point that is re-acquired;

[0021] If the number of the first insulation resistance measuring points of the detection unit is greater than 1, re-determining the detection circuit switch that needs to be cut off among the circuit switches in the detection unit;

[0022] Cut off each of the re-determined detection circuit switches to divide the detection unit into a plurality of mutually unconnected units, each of which includes at least one of the insulation resistance measurement points;

[0023] The insulation resistance value detected by the insulation resistance measuring point in each of the units is obtained again, and the fault location is determined according to the comparison result between each of the insulation resistance values ​​obtained again and the preset standard resistance value.

[0024] According to a preferred embodiment of the present invention, determining the fault location according to the comparison result of each of the re-acquired insulation resistance values ​​and the preset standard resistance value includes:

[0025] If the number of first insulation resistance measuring points of the detection unit is equal to 1, the fault location is determined by the second insulation resistance value detected by the second insulation resistance measuring point in the process system where the battery stack is located at the first insulation resistance measuring point; the second insulation resistance measuring point is the insulation resistance measuring point of the process system.

[0026] According to a preferred embodiment of the present invention, determining the fault location by using a second insulation resistance value detected by a second insulation resistance measuring point in the process system where the battery stack is located at the first insulation resistance measuring point includes:

[0027] Stop the pump of the process system and close each liquid inlet valve and liquid outlet valve of the fuel cell stack;

[0028] Obtaining the second insulation resistance value detected by each of the second insulation resistance measuring points;

[0029] When each of the second insulation resistance values ​​is greater than or equal to the preset standard resistance value, it is determined that a process connection of the process system has a fault;

[0030] When any second insulation resistance value is less than the preset standard resistance value, the second insulation resistance value is abnormal, and the second insulation resistance measuring point corresponding to the abnormal second insulation resistance value is a fault location.

[0031] According to a preferred embodiment of the present invention, the positioning method further includes:

[0032] After the fault repair of the liquid flow battery energy storage system is completed, if the insulation resistance values ​​detected by each of the insulation resistance measuring points are greater than the preset standard resistance value, the cut-off circuit switch is closed and the closed valve is opened.

[0033] In order to solve the above technical problems, the second aspect of the present invention proposes a liquid flow battery energy storage system fault positioning system, wherein the liquid flow battery energy storage system is provided with a plurality of insulation resistance measurement points and a plurality of circuit switches for dividing the liquid flow battery energy storage system into mutually unconnected units; the positioning system comprises:

[0034] Insulation resistance detection devices respectively connected to the insulation resistance measurement points, used to obtain the insulation resistance value detected by each of the insulation resistance measurement points;

[0035] A flow battery management device connected to the insulation resistance detection device is used to determine that the system is abnormal when any of the insulation resistance values ​​is abnormal, and to determine a plurality of detection circuit switches that need to be cut off in each of the circuit switches according to the abnormal insulation resistance value and the historical fault insulation resistance value and the corresponding historical fault location data;

[0036] A controller connected to the flow battery management device and each circuit switch, respectively, is used to cut off each detection circuit switch, divide the flow battery energy storage system into a plurality of unconnected units, and re-acquire the insulation resistance value detected by the insulation resistance measuring point in each unit; the unit includes at least one insulation resistance measuring point;

[0037] The liquid flow battery management device is also used to determine the fault location based on the comparison results of each of the re-acquired insulation resistance values ​​and the preset standard resistance value.

[0038] In order to solve the above technical problem, the third aspect of the present invention provides an electronic device, comprising:

[0039] Processor; and

[0040] A memory storing computer executable instructions, wherein when the computer executable instructions are executed, the processor executes the method described in any one of the above embodiments.

[0041] In order to solve the above technical problems, the fourth aspect of the present invention proposes a computer storage medium, wherein the computer storage medium stores one or more programs, and when the one or more programs are executed by a processor, the method described in any one of the above embodiments is implemented.

[0042] Compared with the prior art, the present disclosure has the following advantages: the present disclosure sets multiple insulation resistance measuring points in the liquid flow battery energy storage system and divides the liquid flow battery energy storage system into multiple circuit switches that are not connected to each other. When the insulation resistance measuring point detects an abnormal absolute resistance value, the historical data is used to determine the location with a greater possibility of failure, and the circuit switch that needs to be cut off is determined. The liquid flow battery energy storage system is divided into multiple units by closing the circuit switch, and the insulation resistance value detected by the insulation resistance measuring point in each unit is re-obtained, and a more accurate fault location is determined thereby. This scheme sets insulation resistance measuring points and circuit switches, and when an insulation resistance abnormality is detected, uses historical data and a divided measurement method. This method can quickly and accurately locate the fault location in the liquid flow battery energy storage system, thereby greatly improving the efficiency of fault detection and repair, and ensuring the stable operation of the system.

[0043] Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 A first flow chart of a method for locating a fault in a flow battery energy storage system according to an embodiment of the present disclosure is shown;

[0046] Figure 2 A schematic diagram of the structure of a flow battery energy storage system including two process systems A and B according to an embodiment of the present disclosure is shown;

[0047] Figure 3 A schematic flow chart of a method for determining a circuit switch that needs to be disconnected according to an embodiment of the present disclosure is shown;

[0048] Figure 4 A schematic diagram of the structure of a flow battery energy storage system according to an embodiment of the present disclosure is shown;

[0049] Figure 5 A second flow chart of a method for locating a fault in a flow battery energy storage system according to an embodiment of the present disclosure is shown;

[0050] Figure 6A schematic flow chart of a method for determining a fault location through a second insulation resistance value detected by a second insulation resistance measuring point according to an embodiment of the present disclosure is shown;

[0051] Figure 7 A second structural schematic diagram of a flow battery energy storage system according to an embodiment of the present disclosure is shown;

[0052] Figure 8 A schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0054] The same reference numerals in the drawings represent the same or similar elements, components or parts, and thus the repeated description of the same or similar elements, components or parts may be omitted below. It should also be understood that although the first, second, third and other attributives representing the numbers may be used herein to describe various devices, elements, components or parts, these devices, elements, components or parts should not be limited by these attributives. In other words, these attributives are only used to distinguish one from another. For example, the first device may also be called the second device, but it does not deviate from the essential technical solution of the present invention. In addition, the terms "and / or" and "and / or" refer to all combinations including any one or more of the listed items.

[0055] See also Figure 1 , Figure 1 This is a flow chart of a method for locating a fault in a flow battery energy storage system provided by the present invention. Figure 1 As shown, a plurality of insulation resistance measuring points and a plurality of circuit switches for dividing the flow battery energy storage system into mutually unconnected units are provided in the flow battery energy storage system; the positioning method includes:

[0056] S11. Obtain the insulation resistance value detected at each insulation resistance measuring point.

[0057] In this embodiment, the liquid flow battery energy storage system is a high-performance battery system, and its structure mainly includes the following key parts: 1. Electrolyte: Composition: The positive and negative electrolytes are stored in storage tanks outside the battery respectively. The composition of the electrolyte depends on the type of liquid flow battery. For example, the all-vanadium liquid flow battery uses a solution containing vanadium ions of different valence states as the electrolyte. Function: During the charging and discharging process, the active substances in the electrolyte realize the mutual conversion of electrical energy and chemical energy through reversible redox reactions. 2. Battery stack: Composition: The battery stack is the core component of the liquid flow battery energy storage system, which is assembled by stacking multiple single cells. The main components of a single cell include bipolar plates, electrode frames, electrodes and ion conductive membranes. Function: The electrolyte enters the battery stack system through a circulation pump and pipelines, and a redox reaction occurs on the electrode surface to realize the conversion of electrical energy and chemical energy. The ion conductive membrane is used to isolate the positive and negative electrolytes and transfer ions in the electrolyte to form an electrical circuit. 3. Battery Management System (BMS): Function: The battery management system is responsible for monitoring the operating status of the liquid flow battery energy storage system, including parameters such as electrolyte concentration, voltage, current, etc., and performs corresponding control and management to ensure the safe, stable and efficient operation of the system. 4. Auxiliary System: Composition: The auxiliary system includes components such as circulation pumps, pipelines, valves, sensors, etc. Function: The auxiliary system is responsible for the circulation and transportation of electrolyte, the heat dissipation of the system, and safety protection. The circulation pump is used to promote the circulation of electrolyte between the storage tank and the battery stack; the pipelines and valves are used to connect various components and control the flow direction of the electrolyte; the sensor is used to monitor the operating status of the system in real time. 5. External electrolyte storage tank: Function: Store positive and negative electrolytes, and connect to the battery stack through circulation pumps and pipelines to provide the required electrolyte for the battery stack.

[0058] In this embodiment, a plurality of insulation resistance measuring points are set in the liquid flow battery energy storage system. The insulation resistance measuring points can be set at various connection parts of the liquid flow battery energy storage system, such as the connection points where leakage and other faults are prone to occur, such as the battery stack, pump, storage tank, pipeline, pipeline connection, etc., so that when a fault occurs, it can be detected in time by the insulation resistance measuring points. Since the pipeline length is also relatively long, the insulation resistance measuring points can be set at intervals on the pipeline, or a number of insulation resistance measuring points can be determined according to the environment in which the pipeline is located and the condition of the electrolyte inside the pipeline.

[0059] There are many battery stacks in the liquid flow battery energy storage system. Different battery stacks are connected in series or in parallel to achieve circuit connection. The battery stacks are connected to other equipment through process forms. At the same time, the electrolyte as a conductor will also form a circuit path in each place where the electrolyte flows. The above reasons cause the detection values ​​of each insulation resistance measurement point to be almost the same. When a fault occurs and causes the insulation resistance to be lower than the preset standard resistance value, due to the circuit connectivity, the detection values ​​of each insulation resistance measurement point are almost the same, and the specific fault location cannot be located. In this solution, a circuit switch is set on each battery stack line. When the insulation resistance is detected to be lower than the preset standard resistance value, several circuit switches are selectively disconnected to divide the liquid flow battery energy storage system into unrelated units, and then the insulation resistance of each unit is independently tested, thereby realizing rapid positioning of the fault location.

[0060] In this embodiment, the insulation resistance value is detected in real time by setting insulation resistance measuring points at various positions in the liquid flow battery energy storage system, and whether a fault occurs is determined by the insulation resistance value. If the insulation resistance value is detected to be less than the normal value, it can be determined that a fault such as leakage occurs. In this solution, whether the insulation resistance value is abnormal can be determined by setting a preset standard resistance value.

[0061] In this solution, the liquid flow battery energy storage system includes positive electrode storage tanks, negative electrode storage tanks, rebalancing storage tanks, electrolysis storage tanks, spare storage tanks, positive electrode circulation pumps, negative electrode circulation pumps, electrolysis circulation pumps, rebalancing circulation pumps, valves, battery stacks, thermal management systems, liquid flow battery management systems, voltage inspection systems, bidirectional energy storage inverters, bidirectional DC converters, energy storage containers, transformers, etc.

[0062] The power supply or load is cascaded with the bidirectional DC converter through a bidirectional energy storage inverter, the bidirectional DC converter is connected to the energy storage stack, the energy storage stacks are connected in circuit in series or in parallel through wires, each branch wire is equipped with a switch, the electrolyte in the storage tank enters each stack through a pipeline through a circulation pump, each stack is connected in liquid circuit in series or in parallel through a pipeline, each stack is provided with a liquid inlet valve at the liquid inlet, and each stack outlet is provided with a liquid outlet valve.

[0063] like Figure 2 As shown in the figure, taking a flow battery energy storage system with two process systems A and B as an example, its system architecture is that the positive and negative electrode storage tanks of system A are connected in parallel with the two stack liquid circuits 1# and 2#, respectively, and the positive and negative electrode storage tanks of system B are connected in parallel with the two stack liquid circuits 3# and 4#, respectively. The series branches composed of 1# and 3# and the series branches composed of 2# and 4# are connected in parallel. There are insulation resistance measurement points at each stack, pump, tank, and pipeline in the same passage. Assume that there is a leak in the 1# stack, forming a passage with the ground, resulting in a decrease in the insulation resistance of the system.

[0064] S12. When any insulation resistance value is abnormal, determine that the system is abnormal, and determine a plurality of detection circuit switches that need to be cut off in each circuit switch based on the abnormal insulation resistance value, the historical fault insulation resistance value, and the corresponding historical fault location data.

[0065] In this embodiment, when any insulation resistance value is abnormal, it is not known which measuring point is abnormal at this time, the entire system is connected, and the system as a whole is abnormal. According to historical data and operation records, an algorithm or manual method is used to determine the location with a higher possibility of failure, and the circuit switch that needs to be cut off is determined. After the circuit switch is cut off, the original battery stack circuit is divided into several unconnected parts.

[0066] In this embodiment, deep learning can be used to predict locations with a higher probability of failure based on historical data and operation records. Specifically, a fault prediction model for predicting the fault location is constructed, and the predicted fault location is determined through the fault prediction model.

[0067] Specifically, Figure 3 As shown, the method for determining the circuit switch that needs to be cut off includes:

[0068] S21. Obtain abnormal historical fault insulation resistance detection values ​​and corresponding historical fault locations in historical data.

[0069] In this embodiment, the historical data may be data on past abnormal insulation resistance values ​​and historical fault locations determined by staff based on the abnormal historical insulation resistance values ​​to solve the problem. These data may be automatically summarized and stored by the system based on the recorded data, or may be entered and stored by staff based on actual conditions.

[0070] S22. Taking the abnormal historical fault insulation resistance detection values ​​and the corresponding historical fault locations as samples, a fault prediction model for predicting the fault location is constructed.

[0071] In this embodiment, an initial model is constructed by a deep learning algorithm, and the historical insulation resistance values ​​are used as the input of the initial model, and the data corresponding to the historical fault locations are used as the output of the initial model. The initial model is trained, and when the initial model can accurately predict the prediction results of the historical fault locations through abnormal historical insulation resistance values, the initial model training is determined to be successful.

[0072] S23. Obtain a predicted fault location based on the abnormal insulation resistance detection value and a fault prediction model.

[0073] In this embodiment, the abnormal insulation resistance value obtained in real time is input into the fault prediction model, thereby obtaining the predicted fault position output by the model.

[0074] S24. Determine a plurality of detection circuit switches that need to be disconnected in each circuit switch according to the predicted fault location.

[0075] In this embodiment, based on the predicted fault location, a circuit switch to be disconnected is determined among the circuit switches as a detection circuit switch. Specifically, for example, if the predicted fault location is located at Figure 2 In the battery stack 1 shown, at this time, when determining the detection circuit switch, the battery stack 1 can be separated out separately, and the other battery stacks can be taken as a whole for secondary detection. At this time, only the circuit switch connecting the battery stack 1 with other battery stacks needs to be used as the detection circuit switch. In this way, after closing the detection circuit switch, the insulation resistance of the battery stack 1 can be detected separately to determine whether the part that causes the overall insulation resistance of the system to decrease is the battery stack 1.

[0076] like Figure 4 In the first structural schematic diagram of the liquid flow battery energy storage system shown in FIG. 1 , each insulation resistance measuring point is connected to the insulation resistance detection module, and the detected insulation resistance value is transmitted to the insulation resistance detection module, which transmits the insulation resistance value to the liquid flow battery management system via the communication module. The liquid flow battery management system determines the detection circuit switch that needs to be cut off according to the received insulation resistance value, and sends the detection circuit switch that needs to be cut off to the controller via the communication module, and the controller controls the detection circuit switch to be opened and closed.

[0077] S13, cutting off the switches of each detection circuit to divide the liquid flow battery energy storage system into a plurality of unconnected units; each unit includes at least one insulation resistance measurement point.

[0078] S14, re-obtaining the insulation resistance value detected by the insulation resistance measuring point in each unit, and determining the fault location according to the comparison result of each re-obtained insulation resistance value with the preset standard resistance value.

[0079] In this embodiment, by cutting off the detection circuit switch determined in the above steps, the flow battery energy storage system is divided into a plurality of unconnected units, the insulation resistance value detected by the insulation resistance measuring point in each unit is re-acquired, and the unit where the fault occurs is determined by comparing the insulation resistance value detected at this time with the preset standard resistance value, so as to quickly determine the fault location and reduce the difficulty of troubleshooting.

[0080] In this embodiment, after the fault repair of the flow battery energy storage system is completed, if the insulation resistance values ​​detected at each insulation resistance measurement point are greater than the preset standard resistance value, the cut-off circuit switch is closed and the closed valve is opened. After the fault repair of the flow battery energy storage system is completed, if it is detected that the insulation resistance Ri at each location is greater than or equal to the set value R1, the flow battery management system sends a control signal to the controller to close each switch and close each valve, and the insulation resistance values ​​at each location of the system are transmitted to the flow battery management system through the communication module. The flow battery management system displays the system insulation resistance value and prompts that the system insulation resistance is normal and charging and discharging operations can be performed.

[0081] The present disclosure sets multiple insulation resistance measuring points and multiple circuit switches that divide the liquid flow battery energy storage system into unconnected units in the liquid flow battery energy storage system. When the insulation resistance measuring point detects an abnormal absolute resistance value, the location with a greater possibility of failure is judged through historical data, and the circuit switch that needs to be cut off is determined. The liquid flow battery energy storage system is divided into multiple units by closing the circuit switch, and the insulation resistance value detected by the insulation resistance measuring point in each unit is re-obtained, and a more accurate fault location is determined thereby. This solution sets insulation resistance measuring points and circuit switches, and when an insulation resistance abnormality is detected, uses historical data and a divided measurement method. This method can quickly and accurately locate the fault location in the liquid flow battery energy storage system, thereby greatly improving the efficiency of fault detection and repair, and ensuring the stable operation of the system.

[0082] See also Figure 5 , Figure 5 This is a flow chart of a method for locating a fault in a flow battery energy storage system provided by the present invention, as shown in FIG. Figure 5 As shown, in Figure 1 Based on the embodiment of the positioning method shown, the positioning method further includes:

[0083] S31. When all the re-acquired insulation resistance values ​​are greater than or equal to the preset standard resistance value, it is determined that there is a fault in the connection of the circuit where each detection circuit switch is located.

[0084] In this embodiment, after the detection circuit switch is disconnected, if the insulation resistance values ​​obtained at this time are greater than or equal to the preset standard resistance value, then the insulation resistance value is not abnormal at this time. Before the detection circuit switch is disconnected, an insulation resistance measurement point is abnormal, and the insulation resistance value is not abnormal after the detection circuit switch is disconnected. This indicates that there is a fault in the connection of the line where the detection circuit switch is located. The relevant staff only need to check each detection circuit switch and the cables where they are located, which also achieves rapid fault location.

[0085] S32. When any first insulation resistance value is less than a preset standard resistance value, a unit corresponding to a first insulation resistance measuring point whose insulation resistance value is less than the preset standard resistance value is used as a detection unit; the first insulation resistance measuring point is an insulation resistance measuring point of the circuit system, and the first insulation resistance value is an insulation resistance value detected by the re-acquired first insulation resistance measuring point.

[0086] In this embodiment, when not all insulation resistance values ​​are greater than or equal to the preset standard resistance value, since this solution uses a circuit system to detect the resistance value of each position in the system to determine whether a fault such as leakage occurs, the fault will eventually affect the insulation resistance value detected by the circuit system. At this time, a first insulation resistance value will appear that is less than the preset standard resistance value, that is, the insulation resistance value detected by the insulation resistance measuring point of the circuit system is less than the preset standard resistance value. Then, it is only necessary to detect the unit corresponding to the first insulation resistance measuring point for further detection to determine which specific position in the unit has the abnormality.

[0087] S33: If the number of the first insulation resistance measuring points of the detection unit is greater than 1, re-determine the detection circuit switch that needs to be cut off among the circuit switches in the detection unit.

[0088] In this embodiment, it is determined whether the number of insulation resistance measurement points of the circuit system in the detection unit is greater than 1. If it is still greater than 1, the detection unit can be further divided by the circuit switch. The specific division method can refer to the scheme in S12 in the above embodiment, and this scheme will not repeat it.

[0089] S34, cutting off each re-determined detection circuit switch, dividing the detection unit into a plurality of mutually unconnected units, each unit including at least one insulation resistance measurement point.

[0090] S35 , reacquiring the insulation resistance value detected by the insulation resistance measuring point in each unit, and determining the fault location according to the comparison result between each reacquired insulation resistance value and the preset standard resistance value.

[0091] In this embodiment, when the number of the first insulation resistance measuring points is greater than 1, the detection unit is divided into smaller units, and the fault location is determined by re-acquiring the insulation resistance values ​​detected by the insulation resistance measuring points in each unit. On the basis of the scheme in the above embodiment, a more accurate fault location is further determined. The scheme of steps S34 and S35 can refer to the scheme of S13 and S14.

[0092] When any first insulation resistance value is less than the preset standard resistance value, the positioning method further includes:

[0093] If the number of first insulation resistance measuring points of the detection unit is equal to 1, the fault location is determined by the second insulation resistance value detected by the second insulation resistance measuring point in the process system where the battery stack is located at the first insulation resistance measuring point; the second insulation resistance measuring point is the insulation resistance measuring point of the process system.

[0094] In this embodiment, when the number of first insulation resistance measuring points in the detection unit is equal to 1, it can be determined that the fault location is near the battery stack corresponding to the first insulation resistance measuring point. At this time, the fault location is determined by the second insulation resistance value detected by the second insulation resistance measuring point in the process system where the battery stack corresponding to the first insulation resistance measuring point is located, that is, it is determined that an abnormality has occurred at the liquid outlet valve, liquid inlet valve, positive electrode storage tank, negative electrode storage tank, positive circulation pump, negative circulation pump and other locations connected to the battery stack.

[0095] In this embodiment, the second insulation resistance measuring points are the insulation resistance measuring points set on the battery stack, liquid outlet valve, liquid inlet valve, positive electrode storage tank, negative electrode storage tank, positive circulation pump, negative circulation pump and the insulation resistance measuring points set at the connections between these components.

[0096] like Figure 6 As shown, the method steps for determining the fault location by using the second insulation resistance value detected by the second insulation resistance measuring point in the process system where the battery stack is located at the first insulation resistance measuring point include:

[0097] S41. Stop the process system pump and close all liquid inlet valves and liquid outlet valves of the fuel cell stack.

[0098] In this embodiment, the positive circulation pump and the negative circulation pump in the process system where the fuel cell stack is located are stopped, and at the same time, the liquid inlet valves and the liquid outlet valves are closed, and the connection between the process systems where the fuel cell stack is located is closed, so that the fuel cell stack and the liquid outlet valves, the liquid inlet valves, the positive electrode storage tank, the negative electrode storage tank, the positive circulation pump, and the negative circulation pump are separated.

[0099] S42: Obtain the second insulation resistance value detected by each second insulation resistance measuring point.

[0100] In this embodiment, the second insulation resistance value is detected through each second insulation resistance measuring point in the process system, so that the specific location where the fault occurs in the process system can be determined through the second insulation resistance value.

[0101] S43: When all second insulation resistance values ​​are greater than or equal to a preset standard resistance value, it is determined that a process connection of the process system has a fault.

[0102] In this embodiment, after isolating the components in the process system, if the second insulation resistance values ​​obtained at this time are greater than or equal to the preset standard resistance value, then the insulation resistance value is not abnormal at this time. Before isolation, the second insulation resistance value is abnormal, and after isolation, the second insulation resistance value is not abnormal. This can indicate that there is a fault in the process connection of the process system. The relevant staff only need to check the process connection of the process system, which also achieves rapid fault location.

[0103] S44. When any second insulation resistance value is less than a preset standard resistance value, the second insulation resistance value is abnormal, and the second insulation resistance measuring point corresponding to the abnormal second insulation resistance value is a fault location.

[0104] In this embodiment, when any second insulation resistance value is less than the preset standard resistance value, the second insulation resistance measuring point corresponding to the second insulation resistance value is finally determined as the fault location, thereby completing the determination of the specific fault location of the liquid flow battery energy storage system, so that the staff can quickly handle the fault and ensure the stable operation of the system.

[0105] In a specific embodiment, assuming that Figure 2 The stack 1 shown in the figure leaks liquid. At this time, the scheme of the present invention is run, and the system insulation resistance is detected to be lower than the set value. The liquid flow battery management system issues an alarm and automatically cuts off the switch between 1# and 2# and the switch between 3# and 4#. The original circuit is divided into two parts, the first part is composed of 1# and 3# connected, and the second part is composed of 2# and 4# connected. The insulation resistance of the two parts is detected separately, wherein the insulation resistance measurement value of the first part is less than the set value, and the insulation resistance measurement value of the second part is greater than the set value. For the second part, the measurement value of each measuring point is displayed, and the operation is completed. For the first part, it is detected that the number of measuring points it contains is 2 greater than 1, and the switch between 1# and 3# is automatically cut off. The first part is divided into a third part composed of 1# and a fourth part composed of 2#. The insulation resistance of the third part and the fourth part is detected separately, and the insulation resistance measurement value of the third part is less than the set value, and the insulation resistance measurement value of the fourth part is greater than the set value. For the fourth part, the measurement value of its measuring point is displayed, and the operation is completed. For the third part, it was detected that the number of measuring points it contained was 1. The pump of the A process system where it was located was stopped, and all the liquid inlet valves and liquid outlet valves of the 1# fuel cell stack were closed. The insulation resistance of each measuring point of the A process system was detected. Among them, the insulation resistance measurement value of the 1# fuel cell stack was less than the set value, and the insulation resistance measurement values ​​of other measuring points were all greater than the set value. The liquid flow battery management system displayed the insulation resistance measurement values ​​of all measuring points, indicating that the 1# fuel cell stack was faulty, and the fault location was completed.

[0106] like Figure 7As shown in the second structural schematic diagram of the liquid flow battery energy storage system, each insulation resistance measuring point is connected to the insulation resistance detection module, and the detected insulation resistance value is transmitted to the insulation resistance detection module, which transmits the insulation resistance value to the liquid flow battery management system via the communication module. The liquid flow battery management system determines the need to stop the pump and close the valve according to the received insulation resistance value, sends a control instruction to the controller, and controls the positive circulation pump and the negative circulation pump in the process system where the battery stack is located to stop the pump through the controller, and closes each liquid inlet valve and liquid outlet valve at the same time.

[0107] The present invention provides a liquid flow battery energy storage system fault positioning system. The liquid flow battery energy storage system is provided with a plurality of insulation resistance measuring points and a plurality of circuit switches for dividing the liquid flow battery energy storage system into units which are not connected to each other. The positioning system comprises: an insulation resistance detection device connected to the insulation resistance measuring points respectively, a liquid flow battery management device connected to the insulation resistance detection device, and a controller connected to the liquid flow battery management device and each circuit switch respectively.

[0108] In this embodiment, the insulation resistance detection device, that is, the insulation resistance detection module in the above embodiment, is used to obtain the insulation resistance value detected by each insulation resistance measurement point.

[0109] In this embodiment, the liquid flow battery management device, that is, the liquid flow battery management system in the above embodiment, is used to determine that the system is abnormal when any insulation resistance value is abnormal, and determine multiple detection circuit switches that need to be cut off in each circuit switch through the abnormal insulation resistance value and the historical fault insulation resistance value and the corresponding historical fault location data.

[0110] In this embodiment, the controller is used to cut off each detection circuit switch, divide the flow battery energy storage system into a plurality of unconnected units, and re-acquire the insulation resistance value detected by the insulation resistance measuring point in each unit; the unit includes at least one insulation resistance measuring point;

[0111] In this embodiment, the liquid flow battery management device is also used to determine the fault location according to the comparison result of each re-acquired insulation resistance value and the preset standard resistance value.

[0112] In this embodiment, the liquid flow battery management device is specifically used to obtain abnormal historical fault insulation resistance detection values ​​and corresponding historical fault locations in historical data; use the abnormal historical fault insulation resistance detection values ​​and the corresponding historical fault locations as samples to construct a fault prediction model for predicting the fault location; obtain the predicted fault location based on the abnormal insulation resistance detection values ​​and the fault prediction model; and determine multiple detection circuit switches that need to be cut off in each circuit switch based on the predicted fault location.

[0113] In this embodiment, the liquid flow battery management device is specifically used to determine that there is a fault in the connection of the circuit where each detection circuit switch is located when each re-acquired insulation resistance value is greater than or equal to a preset standard resistance value.

[0114] In the present embodiment, the liquid flow battery management device is specifically used to use the unit corresponding to the first insulation resistance measuring point whose insulation resistance value is less than the preset standard resistance value as the detection unit when any first insulation resistance value is less than the preset standard resistance value; the first insulation resistance measuring point is the insulation resistance measuring point of the circuit system, and the first insulation resistance value is the insulation resistance value detected by the re-acquired first insulation resistance measuring point; if the number of the first insulation resistance measuring points of the detection unit is greater than 1, then the detection circuit switch that needs to be cut off is re-determined among the circuit switches in the detection unit; each re-determined detection circuit switch is cut off, and the detection unit is divided into a plurality of unconnected units, each unit including at least one insulation resistance measuring point; the insulation resistance value detected by the insulation resistance measuring point in each unit is obtained again, and the fault location is determined according to the comparison result of each re-acquired insulation resistance value with the preset standard resistance value.

[0115] In this embodiment, the liquid flow battery management device is specifically used to determine the fault location by the second insulation resistance value detected by the second insulation resistance measuring point in the process system where the battery stack is located at the first insulation resistance measuring point if the number of the first insulation resistance measuring points of the detection unit is equal to 1; the second insulation resistance measuring point is the insulation resistance measuring point of the process system.

[0116] In the present embodiment, the liquid flow battery management device is specifically used to stop the process system pump through the controller and close the various liquid inlet valves and liquid outlet valves of the battery stack; obtain the second insulation resistance value detected by each second insulation resistance measuring point; when each second insulation resistance value is greater than or equal to a preset standard resistance value, it is determined that there is a fault in the process connection of the process system; when any second insulation resistance value is less than the preset standard resistance value, the second insulation resistance value is abnormal, and the second insulation resistance measuring point corresponding to the abnormal second insulation resistance value is the fault location.

[0117] In this embodiment, the controller is also connected to the pump in the process system and the various liquid inlet valves and liquid outlet valves of the fuel cell stack, and is used to stop the process system pump and close the various liquid inlet valves and liquid outlet valves of the fuel cell stack according to the instructions of the liquid flow battery management device.

[0118] In this embodiment, the liquid flow battery management device is also used to close the cut-off circuit switch and open the closed valve after the liquid flow battery energy storage system fault repair is completed if the insulation resistance values ​​detected by each insulation resistance measurement point are greater than the preset standard resistance value.

[0119] In this embodiment, the controller is also used to close the disconnected circuit switch and open the closed valve according to the instruction of the liquid flow battery management device.

[0120] like Figure 8 As shown, an embodiment of the present invention provides an electronic device, including a processor 1110, a communication interface 1120, a memory 1130 and a communication bus 1140, wherein the processor 1110, the communication interface 1120, and the memory 1130 communicate with each other through the communication bus 1140;

[0121] Memory 1130, used for storing computer programs;

[0122] The processor 1110 is used to implement any of the above methods when executing the program stored in the memory 1130.

[0123] In the electronic device provided by the embodiment of the present invention, the processor 1110 obtains the insulation resistance value detected by each of the insulation resistance measuring points by executing the program stored in the memory 1130; when any of the insulation resistance values ​​is abnormal, the system is determined to be abnormal, and a plurality of detection circuit switches that need to be cut off in each of the circuit switches are determined by the abnormal insulation resistance value and the historical fault insulation resistance value and the corresponding historical fault position data; each of the detection circuit switches is cut off to divide the liquid flow battery energy storage system into a plurality of unconnected units; each of the units includes at least one insulation resistance measuring point; the insulation resistance value detected by the insulation resistance measuring point in each unit is re-obtained, and the fault location is determined according to the comparison result of each of the re-obtained insulation resistance values ​​with the preset standard resistance value.

[0124] The communication bus 1140 mentioned in the above electronic device can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The communication bus 1140 can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0125] The communication interface 1120 is used for communication between the above electronic device and other devices.

[0126] The memory 1130 may include a random access memory 1130 (RAM), or may include a non-volatile memory 1130 (non-volatile memory), such as at least one disk memory 1130. Optionally, the memory 1130 may also be at least one storage device located away from the processor 1110.

[0127] The above-mentioned processor 1110 can be a general-purpose processor 1110, including a central processing unit 1110 (CPU), a network processor 1110 (NP), etc.; it can also be a digital signal processor 1110 (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0128] An embodiment of the present invention provides a computer-readable storage medium, which stores one or more programs. The one or more programs can be executed by one or more processors 1110 to implement the method of any of the above embodiments.

[0129] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state hard disk SolidStateDisk (SSD)), etc.

[0130] Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for locating a fault in a flow battery energy storage system, characterized in that: The liquid flow battery energy storage system is provided with a plurality of insulation resistance measuring points and a plurality of circuit switches for dividing the liquid flow battery energy storage system into mutually unconnected units; the positioning method comprises: Obtaining the insulation resistance value detected by each of the insulation resistance measuring points; When any of the insulation resistance values ​​is abnormal, the system is determined to be abnormal, and a plurality of detection circuit switches that need to be cut off in each of the circuit switches are determined based on the abnormal insulation resistance value, the historical fault insulation resistance value, and the corresponding historical fault location data; Cut off each of the detection circuit switches to divide the flow battery energy storage system into a plurality of unconnected units; each unit includes at least one of the insulation resistance measurement points; The insulation resistance value detected by the insulation resistance measuring point in each unit is re-obtained, and the fault location is determined according to the comparison result between each re-obtained insulation resistance value and a preset standard resistance value.

2. The positioning method according to claim 1, characterized in that: The method of determining a plurality of detection circuit switches that need to be cut off in each of the circuit switches by using the abnormal insulation resistance value, the historical fault insulation resistance value and the corresponding historical fault location data includes: Obtain abnormal historical fault insulation resistance detection values ​​and corresponding historical fault locations in historical data; Taking the abnormal historical fault insulation resistance detection value and the corresponding historical fault location as samples, a fault prediction model for predicting the fault location is constructed; Obtaining a predicted fault location according to the abnormal insulation resistance detection value and the fault prediction model; A plurality of the detection circuit switches that need to be disconnected are determined in each of the circuit switches according to the predicted fault position.

3. The positioning method according to claim 1, characterized in that: The determining of the fault location according to the comparison result between each of the re-acquired insulation resistance values ​​and the preset standard resistance value comprises: When each of the reacquired insulation resistance values ​​is greater than or equal to the preset standard resistance value, it is determined that a connection failure exists in the circuit where each of the detection circuit switches is located.

4. The positioning method according to claim 3, characterized in that: Determining the fault location according to the comparison result of each of the re-acquired insulation resistance values ​​and the preset standard resistance value includes: When any first insulation resistance value is less than the preset standard resistance value, a unit corresponding to a first insulation resistance measuring point whose insulation resistance value is less than the preset standard resistance value is used as a detection unit; the first insulation resistance measuring point is an insulation resistance measuring point of the circuit system, and the first insulation resistance value is an insulation resistance value detected by the first insulation resistance measuring point that is re-acquired; If the number of the first insulation resistance measuring points of the detection unit is greater than 1, re-determining the detection circuit switch that needs to be cut off among the circuit switches in the detection unit; Cut off each of the re-determined detection circuit switches to divide the detection unit into a plurality of mutually unconnected units, each of which includes at least one of the insulation resistance measurement points; The insulation resistance value detected by the insulation resistance measuring point in each of the units is obtained again, and the fault location is determined according to the comparison result between each of the insulation resistance values ​​obtained again and the preset standard resistance value.

5. The positioning method according to claim 4, characterized in that: Determining the fault location according to the comparison result of each of the re-acquired insulation resistance values ​​and the preset standard resistance value includes: If the number of first insulation resistance measuring points of the detection unit is equal to 1, the fault location is determined by the second insulation resistance value detected by the second insulation resistance measuring point in the process system where the battery stack is located at the first insulation resistance measuring point; the second insulation resistance measuring point is the insulation resistance measuring point of the process system.

6. The positioning method according to claim 5, characterized in that: The determining of the fault location by using a second insulation resistance value detected by a second insulation resistance measuring point in the process system where the battery stack at the first insulation resistance measuring point is located comprises: Stop the pump of the process system and close each liquid inlet valve and liquid outlet valve of the fuel cell stack; Obtaining the second insulation resistance value detected by each of the second insulation resistance measuring points; When each of the second insulation resistance values ​​is greater than or equal to the preset standard resistance value, it is determined that a process connection of the process system has a fault; When any second insulation resistance value is less than the preset standard resistance value, the second insulation resistance value is abnormal, and the second insulation resistance measuring point corresponding to the abnormal second insulation resistance value is a fault location.

7. The positioning method according to any one of claims 1 to 6, characterized in that: The positioning method further comprises: After the fault repair of the liquid flow battery energy storage system is completed, if the insulation resistance values ​​detected by each of the insulation resistance measuring points are greater than the preset standard resistance value, the cut-off circuit switch is closed and the closed valve is opened.

8. A fault location system for a flow battery energy storage system, characterized in that: The liquid flow battery energy storage system is provided with a plurality of insulation resistance measuring points and a plurality of circuit switches for dividing the liquid flow battery energy storage system into units that are not connected to each other; The positioning system comprises: Insulation resistance detection devices respectively connected to the insulation resistance measurement points, used to obtain the insulation resistance value detected by each of the insulation resistance measurement points; A flow battery management device connected to the insulation resistance detection device is used to determine that the system is abnormal when any of the insulation resistance values ​​is abnormal, and to determine a plurality of detection circuit switches that need to be cut off in each of the circuit switches according to the abnormal insulation resistance value and the historical fault insulation resistance value and the corresponding historical fault location data; A controller connected to the flow battery management device and each circuit switch, respectively, is used to cut off each detection circuit switch, divide the flow battery energy storage system into a plurality of unconnected units, and re-acquire the insulation resistance value detected by the insulation resistance measuring point in each unit; the unit includes at least one insulation resistance measuring point; The liquid flow battery management device is also used to determine the fault location based on the comparison results of each of the re-acquired insulation resistance values ​​and the preset standard resistance value.

9. An electronic device, characterized in that: include: processor; as well as A memory storing computer executable instructions which, when executed, cause the processor to perform the method according to any one of claims 1-7.

10. A computer storage medium, characterized in that: in, The computer storage medium stores one or more programs, and when the one or more programs are executed by a processor, the method of any one of claims 1 to 7 is implemented.

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