CN114325228B - Insulation fault point positioning method, system and storage medium for energy storage system - Google Patents
Insulation fault point positioning method, system and storage medium for energy storage system Download PDFInfo
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- CN114325228B CN114325228B CN202111594255.1A CN202111594255A CN114325228B CN 114325228 B CN114325228 B CN 114325228B CN 202111594255 A CN202111594255 A CN 202111594255A CN 114325228 B CN114325228 B CN 114325228B
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Abstract
The invention discloses an insulation fault point positioning method, an insulation fault point positioning system and a storage medium of an energy storage system, wherein the method comprises the following steps: acquiring a loop insulation resistance value in each group of battery systems; judging whether insulation faults occur to the corresponding battery system according to the loop insulation resistance value; when an insulation fault occurs, acquiring the positive electrode grounding voltage of a direct current bus and the negative electrode grounding voltage of the direct current bus in a corresponding battery system; and positioning fault points according to the relation among the voltage to the ground of the positive electrode of the direct current bus, the voltage to the ground of the negative electrode of the direct current bus and the total voltage of the corresponding battery system. By implementing the invention, the insulation resistance value of the loop in the battery system is compared with the fault resistance value, and the battery system with insulation fault is determined; the collected dc bus voltage to ground is then compared to the total voltage of the battery system to determine a faulty battery in the battery system that is faulty. Therefore, accurate positioning of the insulation fault point is realized, and the safety of the energy storage system is ensured.
Description
Technical Field
The invention relates to the technical field of energy storage systems, in particular to an insulation fault point positioning method, an insulation fault point positioning system and a storage medium of an energy storage system.
Background
The energy storage power station is generally formed by connecting single batteries in series and parallel to form a battery pack, and then the battery pack is formed into a battery system, so that the voltage is often higher, generally hundreds of volts, and the high-voltage safety protection is an important technology of the high-voltage battery pack system. Under normal state, the positive/negative bus of the battery system has good insulating property with the shell of the equipment, but in the use process, the electric leakage can occur due to dielectric breakdown caused by the problems of vibration, device aging, humidity, corrosion and the like, and the personal safety of operators is affected: in the event of an extreme case of an earth fault, the energy storage converter connected to the earth fault may be damaged or even fire, so that in such a high-voltage battery system, the insulation detection of the real-time detection system is of great importance.
Currently, insulation resistance monitoring is an important object of electrochemical energy storage power station battery management system (BatteryManagement System, BMS) safety monitoring. If the insulation state of the battery system is deteriorated, the safety of equipment and personnel is directly affected, and accidents may be caused in serious cases. At present, a passive monitoring method (an external resistance switching method, a balanced bridge method and the like) is generally adopted for an insulation monitoring function of the BMS of the energy storage power station, and a design mode of integrating an insulation monitoring module into a battery cluster management unit is mainly adopted, so that the insulation monitoring is used as one of the functions of the battery cluster management unit. The method has the following two defects: 1) The external resistor loop directly reduces the overall insulation performance of the system; 2) The passive monitoring method is not suitable for an on-line monitoring function. As the application scale of electrochemical energy storage power stations increases and the scene increases, the operational safety problem of battery systems becomes increasingly complex. Therefore, an increasing demand is being placed on the insulation monitoring function of the energy storage power station BMS.
In addition, during insulation resistance monitoring, at present, most of equipment of factories is provided with independent insulation monitoring systems, insulation problems of power grids of the systems are monitored respectively, insulation faults can be reported only, fault points cannot be located, and engineer problem searching analysis is not facilitated.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a method, a system and a storage medium for locating an insulation fault point of an energy storage system, so as to solve the technical problem that an insulation monitoring system in the prior art cannot determine the insulation fault point.
The technical scheme provided by the invention is as follows:
an embodiment of the present invention provides a method for positioning an insulation fault point of an energy storage system, including: acquiring a loop insulation resistance value in each group of battery systems; judging whether insulation faults occur to the corresponding battery systems according to the loop insulation resistance values; when an insulation fault occurs, acquiring the positive electrode grounding voltage of a direct current bus and the negative electrode grounding voltage of the direct current bus in a corresponding battery system; and positioning fault points according to the relation between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system.
Optionally, fault point positioning is performed according to the relationship between the positive electrode voltage to ground of the direct current bus, the negative electrode voltage to ground of the direct current bus and the total voltage of the corresponding battery system, including: calculating according to the relation between the positive electrode of the direct current bus and the ground voltage and the total voltage to obtain a first fault battery; calculating according to the relation between the direct current bus negative electrode ground voltage and the total voltage to obtain a second fault battery; and carrying out fault positioning according to the battery between the first fault battery and the second fault battery.
Optionally, the first faulty battery is calculated by the following formula:
wherein N is 1 Indicating a first faulty battery, U 1 Represents the voltage to the ground of the positive electrode of the direct current bus, U CELL Representing the total voltage;
the second faulty battery is calculated by the following formula:
wherein N is 2 Indicating a second faulty battery, U 2 Represents the voltage to the ground of the negative electrode of the direct current bus, U CELL Representing the total voltage.
Optionally, before acquiring the loop insulation resistance value in each group of battery systems, the method further comprises: obtaining a direct current positive and negative pole ground insulation resistance value on a direct current bus; judging the relation between the direct current positive and negative electrode insulation resistance value to ground and the first fault resistance value; and when the direct current positive and negative electrode insulation resistance value to ground is smaller than the first fault resistance value, acquiring a loop insulation resistance value in each group of battery systems.
Optionally, determining whether an insulation fault occurs in the corresponding battery system according to the loop insulation resistance value includes: judging the relation between the loop insulation resistance value and the second fault resistance value; when the loop insulation resistance value is smaller than the second fault resistance value, judging that the corresponding battery system fails; and when the loop insulation resistance value is larger than or equal to the second fault resistance value, judging that the corresponding battery system is not in fault.
A second aspect of an embodiment of the present invention provides an insulation fault point positioning system of an energy storage system, including: the battery system insulation monitoring system is used for collecting the insulation resistance value of a loop in each group of battery systems, and the positive electrode voltage to the ground of a direct current bus and the negative electrode voltage to the ground of the direct current bus in the corresponding battery system; the microprocessor is used for judging whether insulation faults occur to the corresponding battery system according to the loop insulation resistance value; when an insulation fault occurs, acquiring the positive electrode grounding voltage of a direct current bus and the negative electrode grounding voltage of the direct current bus in a corresponding battery system; and positioning fault points according to the relation between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system.
Optionally, the energy storage system insulation fault point positioning system further comprises: the direct current bus insulation monitoring equipment is used for collecting the insulation resistance value of the direct current anode and the direct current cathode on the direct current bus to the ground; the microprocessor is also used for judging the relation between the direct current positive and negative electrode insulation resistance value to ground and the first fault resistance value; and when the direct current positive and negative electrode insulation resistance value to ground is smaller than the first fault resistance value, acquiring a loop insulation resistance value in each group of battery systems.
Optionally, the dc bus insulation monitoring device includes: the device comprises a first resistor, a second resistor, a first switch and a second switch, wherein one end of the first switch is connected with the positive electrode of a direct current bus, the other end of the first switch is connected with one end of the first resistor, the other end of the first resistor is connected with one end of a second resistor obtained by connecting the other end of the first resistor to the ground, the other end of the second resistor is connected with one end of the second switch, and the other end of the second switch is connected with the negative electrode of the direct current bus; and when the first switch and the second switch are closed, the direct current bus insulation monitoring equipment collects the direct current positive and negative electrode insulation resistance value to ground on the direct current bus.
Optionally, the battery system insulation monitoring device includes: the device comprises a third resistor, a fourth resistor, a third switch, a fourth switch, a first connecting switch, a second connecting switch, a first voltage detection device and a second voltage detection device, wherein the first connecting switch is arranged between the positive electrode of a battery system and the positive electrode of a direct current bus, and the second connecting switch is arranged between the negative electrode of the battery system and the negative electrode of the direct current bus; one end of the third switch is connected with the positive electrode of the battery system, the other end of the third switch is connected with one end of the third resistor, the other end of the third resistor is connected with one end of a fourth resistor and is grounded, the other end of the fourth resistor is connected with one end of the fourth switch, and the other end of the fourth switch is connected with the negative electrode of the battery system; the first voltage detection device is arranged at two ends of the third switch and the third resistor, and the second voltage detection device is arranged at two ends of the fourth switch and the fourth resistor; when the direct current positive and negative electrode ground insulation resistance value is smaller than a first fault resistance value, the first connecting switch and the second connecting switch are opened, and the third switch and the fourth switch are closed.
A third aspect of the embodiments of the present invention provides a computer readable storage medium, where computer instructions are stored, where the computer instructions are configured to cause the computer to perform the energy storage system insulation fault point positioning method according to any one of the first aspect and the first aspect of the embodiments of the present invention.
The technical scheme provided by the invention has the following effects:
according to the energy storage system insulation fault point positioning method, the energy storage system insulation fault point positioning system and the storage medium, the insulation fault of the battery system is determined by comparing the loop insulation resistance value with the fault resistance value in the battery system; and comparing the collected positive electrode voltage to ground of the direct current bus with the collected negative electrode voltage to ground of the direct current bus with the total voltage of the battery system, so as to determine the fault battery with faults in the battery system. Therefore, the method for positioning the insulation fault point of the energy storage system not only realizes fault positioning of the battery system, but also further realizes positioning of the fault battery in the battery system, thereby realizing accurate positioning of the insulation fault point and guaranteeing safety of the energy storage system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of locating an insulation fault point of an energy storage system according to an embodiment of the present invention;
FIG. 2 is a block diagram of an energy storage system according to an embodiment of the present invention;
FIG. 3 is a block diagram of an energy storage system insulation fault point location system according to an embodiment of the present invention;
FIG. 4 is a block diagram of an energy storage system insulation fault point location system according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a computer-readable storage medium provided according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for positioning an insulation fault point of an energy storage system, which is shown in fig. 1 and comprises the following steps:
step S101: and acquiring a loop insulation resistance value in each group of battery systems.
In an energy storage system, as shown in fig. 2, it is generally composed of a plurality of battery systems, an energy storage converter, a transformer and a power grid. The DC1+ and DC 1-are direct current buses of a battery system (including but not limited to a battery cell, a battery box, a battery cluster and a battery cabin), the DC+ and DC-are buses after the battery system is converged, and are high-voltage circuits with more than 1000V, the capacity of the battery system is large, the megawatt level is common, the positive and negative buses on the direct current side are insulation systems to the ground, and if insulation faults occur, serious damage can be caused to peripheral personnel of a system security level. Therefore, insulation monitoring equipment can be arranged in the energy storage system to monitor whether insulation faults occur in the energy storage in real time.
In one embodiment, an insulation monitoring system may be provided in each battery system of the energy storage system, and the insulation resistance value of the loop, that is, the insulation resistance value of the positive and negative poles in the loop to the ground, may be monitored by the insulation monitoring device, so as to monitor whether an insulation fault occurs in the corresponding battery system.
Step S102: and judging whether insulation faults occur to the corresponding battery system according to the loop insulation resistance value. Specifically, after the insulation monitoring device of the corresponding battery system collects the insulation resistance value of the loop, the insulation resistance value can be compared with a preset second fault resistance value to judge whether an insulation fault occurs. When the acquired loop insulation resistance value is smaller than the second fault resistance value, the battery system is indicated to have insulation fault; and if the acquired loop insulation resistance value is greater than or equal to the second fault resistance value, indicating that the battery system has no insulation fault.
Step S103: and when the insulation fault occurs, the positive electrode voltage to the ground of the direct current bus and the negative electrode voltage to the ground of the direct current bus in the corresponding battery system are obtained. Specifically, if the loop insulation resistance value is detected to be smaller than the fault resistance value, it is indicated that an insulation fault has occurred, and at this time, it is necessary to determine the fault point in the loop at which the insulation fault has specifically occurred. A plurality of strings of batteries are generally included in each battery system, and therefore, when an insulation failure occurs, it is necessary to judge a specific failed battery. Therefore, the positive electrode voltage to ground of the direct current bus and the negative electrode voltage to ground of the direct current bus in the corresponding battery system can be obtained.
Step S104: and positioning fault points according to the relation between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system. After the positive electrode voltage to ground of the direct current bus and the negative electrode voltage to ground of the direct current bus are obtained, a specific fault point with faults can be judged according to the relation between the direct current bus and the total voltage in the battery system.
In one embodiment, when determining a fault point, calculating according to the relationship between the voltage of the positive electrode of the direct current bus to the ground and the total voltage to obtain a first fault battery; calculating according to the relation between the voltage of the negative electrode of the direct current bus to the ground and the total voltage to obtain a second fault battery; and carrying out fault positioning according to the battery between the first fault battery and the second fault battery.
The first fault battery is calculated by the following formula:
wherein N is 1 Indicating a first faulty battery, U 1 Represents the voltage to the ground of the positive electrode of the direct current bus, U CELL Representing the total voltage;
the second faulty battery is calculated by the following formula:
wherein N is 2 Indicating a second faulty battery, U 2 Represents the voltage to the ground of the negative electrode of the direct current bus, U CELL Representing the total voltage.
By the calculation formulas of the first fault battery and the second fault battery, the N-th starting of the first fault battery which possibly fails, namely the positive electrode, can be calculated 1 String cell and second faulty cell, negative pole initiated nth 2 And (5) stringing the battery. Thus, by the calculation result, the fault point of the insulation fault can be positioned to N 1 And N 2 Between, through the pair N 1 And N 2 Inspection of the battery in between further determines that a particular fault has occurredIs provided.
According to the energy storage system insulation fault point positioning method provided by the embodiment of the invention, the battery system with insulation fault is determined by comparing the loop insulation resistance value with the fault resistance value in the battery system; and comparing the collected positive electrode voltage to ground of the direct current bus with the collected negative electrode voltage to ground of the direct current bus with the total voltage of the battery system, so as to determine the fault battery with faults in the battery system. Therefore, the method for positioning the insulation fault point of the energy storage system not only realizes fault positioning of the battery system, but also further realizes positioning of the fault battery in the battery system, thereby realizing accurate positioning of the insulation fault point and guaranteeing safety of the energy storage system.
In one embodiment, before acquiring the loop insulation resistance value in each group of battery systems, the method further comprises: obtaining a direct current positive and negative pole ground insulation resistance value on a direct current bus; judging the relation between the direct current positive and negative electrode insulation resistance value to ground and the first fault resistance value; and when the direct current positive and negative electrode insulation resistance value to ground is smaller than the first fault resistance value, acquiring a loop insulation resistance value in each group of battery systems.
Specifically, since the plurality of battery systems are all connected to the dc bus of the energy storage system, the total insulation monitoring device can be arranged on the dc bus, the insulation resistance of the dc positive and negative poles is detected by the dc bus insulation monitoring device before the insulation resistance value of the circuit of each battery system is obtained, and when the insulation resistance value of the dc positive and negative poles is smaller than the first fault resistance value, the insulation resistance value of the circuit of each battery system is obtained after the insulation fault is judged.
The embodiment of the invention also provides an insulation fault point positioning system of the energy storage system, as shown in fig. 3, which comprises: the battery system insulation monitoring system is used for collecting the insulation resistance value of a loop in each group of battery systems, and the positive electrode voltage to the ground of a direct current bus and the negative electrode voltage to the ground of the direct current bus in the corresponding battery system; the microprocessor is used for judging whether insulation faults occur to the corresponding battery system according to the loop insulation resistance value; when an insulation fault occurs, acquiring the positive electrode grounding voltage of a direct current bus and the negative electrode grounding voltage of the direct current bus in a corresponding battery system; and positioning fault points according to the relation between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system. The microprocessor may be an energy storage management system or a battery management system in the energy storage system, and the processing of the data by the microprocessor is specifically referred to the corresponding parts of the above method embodiments, which are not described herein again.
According to the insulation fault point positioning system of the energy storage system, provided by the embodiment of the invention, the insulation fault of the battery system is determined by comparing the loop insulation resistance value with the fault resistance value in the battery system; and comparing the collected positive electrode voltage to ground of the direct current bus with the collected negative electrode voltage to ground of the direct current bus with the total voltage of the battery system, so as to determine the fault battery with faults in the battery system. Therefore, the energy storage system insulation fault point positioning system not only realizes fault positioning of the battery system, but also further realizes positioning of a fault battery in the battery system, thereby realizing accurate positioning of the insulation fault point and guaranteeing safety of the energy storage system.
In one embodiment, as shown in fig. 3, the energy storage system insulation fault point positioning system further includes: the direct current bus insulation monitoring equipment is used for collecting the insulation resistance value of the direct current anode and the direct current cathode on the direct current bus to the ground; the microprocessor is also used for judging the relation between the direct current positive and negative electrode insulation resistance value to ground and the first fault resistance value; and when the direct current positive and negative electrode insulation resistance value to ground is smaller than the first fault resistance value, acquiring a loop insulation resistance value in each group of battery systems.
In one embodiment, as shown in fig. 4, the dc bus insulation monitoring apparatus includes: the direct current power supply comprises a first resistor R1, a second resistor R2, a first switch QA1 and a second switch QA2, wherein one end of the first switch QA1 is connected with the positive electrode of a direct current bus, the other end of the first switch QA1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with one end of the second resistor R2 obtained by connecting the other end of the second resistor R2 to the ground, the other end of the second resistor R2 is connected with one end of the second switch QA2, and the other end of the second switch QA2 is connected with the negative electrode of the direct current bus; after the first switch QA1 and the second switch QA2 are closed, the dc bus insulation monitoring device collects the dc positive-negative insulation resistance value to ground on the dc bus. The direct current bus insulation monitoring device can be compatible with the insulation monitoring device in the battery cluster.
In one embodiment, as shown in fig. 4, the battery system insulation monitoring apparatus includes: the battery system comprises a third resistor R3, a fourth resistor R4, a third switch QA3, a fourth switch QA4, a first connecting switch QF1, a second connecting switch QF2, a first voltage detection device and a second voltage detection device, wherein the first connecting switch QF1 is arranged between a negative electrode of the battery system and a negative electrode of a direct current bus, and the second connecting switch QF2 is arranged between a positive electrode of the battery system and a positive electrode of the direct current bus; one end of the third switch QA3 is connected with the positive electrode of the battery system, the other end of the third switch QA3 is connected with one end of the third resistor R3, the other end of the third resistor R3 is connected with one end of a fourth resistor R4 obtained by connection, and the other end of the fourth resistor R4 is connected with one end of the fourth switch QA4, and the other end of the fourth switch QA4 is connected with the negative electrode of the battery system; the first voltage detection device is arranged at two ends of the third switch QA3 and the third resistor R3, and the second voltage detection device is arranged at two ends of the fourth switch QA4 and the fourth resistor R4; when the direct current positive and negative electrode ground insulation resistance value is smaller than a first fault resistance value, the first connecting switch QF1 and the second connecting switch QF2 are opened, and the third switch QA3 and the fourth switch QA4 are closed. The first voltage detection device and the second voltage detection device can adopt the existing device capable of collecting voltage, and the specific structure of the device is not limited in the embodiment of the invention.
In one embodiment, the energy storage system insulation fault point positioning system adopts the following flow to realize fault positioning through the structure: when the energy storage system operates, the whole energy storage system only works with a direct current bus insulation monitoring device, the direct current bus insulation monitoring device detects the direct current positive and negative electrode insulation resistance to ground, namely a first resistor R1 and a second resistor R2, through closing a first switch QA1 and a second switch QA2, and a third switch QA3 and a fourth switch QA4 in insulation detection devices in other battery clusters are disconnected and do not monitor;
when the direct current bus insulation monitoring equipment detects that the first resistance R1 (or the second resistance R2) is less than the first fault resistance R 1 failure of The method comprises the steps that a command for disconnecting each battery system is reported to an energy storage management system through communication, the energy storage management system sends out a command for disconnecting each battery system, namely, the connection of each battery system insulation monitoring device and a direct current bus is disconnected, namely, a first connecting switch QF1 and a second connecting switch QF2 are disconnected, each battery system is split into n independent subsystems, when the direct current bus insulation monitoring device sends out the battery system insulation monitoring devices 1-n through communication, the command is sent out to simultaneously start an insulation detection function, and when all third switches QA3 and fourth switches QA4 of the battery system insulation monitoring devices 1-n are closed, the third resistors R3 and the fourth resistors R4 of sub-loop insulation resistors are detected respectively.
When one of the battery system insulation monitoring devices detects that the third resistance R3 (or the fourth resistance R4) < the second fault resistance R 2 failure of When the subsystem is judged to have insulation faults, a first voltage detection device and a second voltage detection device are started to detect the DC bus voltage to ground, namely a direct current bus positive electrode voltage to ground U1 and a direct current bus negative electrode voltage to ground U2, respectively, and the detection values of U1 and U2 are reported to a battery management system of each battery subsystem; the battery management system obtains U1 and U2, and calculates N through the formula 1 And N 2 The insulation fault point of the battery is N 1 And N 2 And the problem points are precisely positioned, so that the system safety is ensured.
The functional description of the insulation fault point positioning system of the energy storage system provided by the embodiment of the invention is described in detail by referring to the insulation fault point positioning method of the energy storage system in the embodiment.
An embodiment of the present invention further provides a storage medium, as shown in fig. 5, on which a computer program 601 is stored, which when executed by a processor, implements the steps of the insulation fault point positioning method of the energy storage system in the above embodiment. The storage medium also stores audio and video stream data, characteristic frame data, interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
The embodiment of the present invention further provides an electronic device, as shown in fig. 6, which may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or other means, and in fig. 6, the connection is exemplified by a bus.
The processor 51 may be a central processing unit (Central Processing Unit, CPU). The processor 51 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52 serves as a non-transitory computer readable storage medium that may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as corresponding program instructions/modules in embodiments of the present invention. The processor 51 executes various functional applications of the processor and data processing by running non-transitory software programs, instructions and modules stored in the memory 52, i.e., implementing the energy storage system insulation fault point locating method in the method embodiments described above.
The memory 52 may include a memory program area that may store an operating device, an application program required for at least one function, and a memory data area; the storage data area may store data created by the processor 51, etc. In addition, memory 52 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 52 may optionally include memory located remotely from processor 51, which may be connected to processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and when executed by the processor 51 perform the energy storage system insulation fault point locating method of the embodiment shown in fig. 1.
The specific details of the electronic device may be understood correspondingly with respect to the corresponding related descriptions and effects in the embodiment shown in fig. 1, which are not repeated herein.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (8)
1. An insulation fault point positioning method for an energy storage system, which is characterized by comprising the following steps:
acquiring a loop insulation resistance value in each group of battery systems;
judging whether insulation faults occur to the corresponding battery systems according to the loop insulation resistance values;
when an insulation fault occurs, acquiring the positive electrode grounding voltage of a direct current bus and the negative electrode grounding voltage of the direct current bus in a corresponding battery system;
positioning fault points according to the relation between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system;
performing fault point positioning according to the relationship between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system, including:
calculating according to the relation between the positive electrode of the direct current bus and the ground voltage and the total voltage to obtain a first fault battery;
calculating according to the relation between the direct current bus negative electrode ground voltage and the total voltage to obtain a second fault battery;
performing fault location according to the battery between the first fault battery and the second fault battery;
the first fault battery is calculated by the following formula:
wherein N is 1 Indicating a first faulty battery, U 1 Represents the voltage to the ground of the positive electrode of the direct current bus, U CELL Representing the total voltage;
the second faulty battery is calculated by the following formula:
wherein N is 2 Indicating a second faulty battery, U 2 Represents the voltage to the ground of the negative electrode of the direct current bus, U CELL Representing the total voltage.
2. The method of claim 1, further comprising, prior to obtaining the loop insulation resistance values in each set of battery systems:
obtaining a direct current positive and negative pole ground insulation resistance value on a direct current bus;
judging the relation between the direct current positive and negative electrode insulation resistance value to ground and the first fault resistance value;
and when the direct current positive and negative electrode insulation resistance value to ground is smaller than the first fault resistance value, acquiring a loop insulation resistance value in each group of battery systems.
3. The method for locating an insulation fault point of an energy storage system according to claim 1, wherein determining whether an insulation fault occurs in a corresponding battery system according to the loop insulation resistance value comprises:
judging the relation between the loop insulation resistance value and the second fault resistance value;
when the loop insulation resistance value is smaller than the second fault resistance value, judging that the corresponding battery system fails;
and when the loop insulation resistance value is larger than or equal to the second fault resistance value, judging that the corresponding battery system is not in fault.
4. An energy storage system insulation fault point positioning system, comprising: a battery system insulation monitoring device and a microprocessor,
the battery system insulation monitoring system is used for collecting the loop insulation resistance value in each group of battery systems and the positive electrode grounding voltage and the negative electrode grounding voltage of the direct current bus in the corresponding battery system;
the microprocessor is used for judging whether insulation faults occur to the corresponding battery system according to the loop insulation resistance value; when an insulation fault occurs, acquiring the positive electrode grounding voltage of a direct current bus and the negative electrode grounding voltage of the direct current bus in a corresponding battery system; positioning fault points according to the relation between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system;
performing fault point positioning according to the relationship between the positive electrode voltage to the ground of the direct current bus, the negative electrode voltage to the ground of the direct current bus and the total voltage of the corresponding battery system, including:
calculating according to the relation between the positive electrode of the direct current bus and the ground voltage and the total voltage to obtain a first fault battery;
calculating according to the relation between the direct current bus negative electrode ground voltage and the total voltage to obtain a second fault battery;
performing fault location according to the battery between the first fault battery and the second fault battery;
the first fault battery is calculated by the following formula:
wherein N is 1 Indicating a first faulty battery, U 1 Represents the voltage to the ground of the positive electrode of the direct current bus, U CELL Representing the total voltage;
the second faulty battery is calculated by the following formula:
wherein N is 2 Indicating a second faulty battery, U 2 Represents the voltage to the ground of the negative electrode of the direct current bus, U CELL Representing the total voltage.
5. The energy storage system insulation fault point positioning system of claim 4, further comprising: the insulation monitoring equipment for the direct current bus is provided with a plurality of monitoring devices,
the direct current bus insulation monitoring equipment is used for collecting the insulation resistance value of the direct current anode and the direct current cathode on the direct current bus to the ground;
the microprocessor is also used for judging the relation between the direct current positive and negative electrode insulation resistance value to ground and the first fault resistance value; and when the direct current positive and negative electrode insulation resistance value to ground is smaller than the first fault resistance value, acquiring a loop insulation resistance value in each group of battery systems.
6. The energy storage system insulation fault point positioning system of claim 5, wherein the dc bus insulation monitoring device comprises: a first resistor, a second resistor, a first switch and a second switch,
one end of the first switch is connected with the positive electrode of the direct current bus, the other end of the first switch is connected with one end of the first resistor, the other end of the first resistor is connected with one end of a second resistor, which is obtained, and is grounded, the other end of the second resistor is connected with one end of the second switch, and the other end of the second switch is connected with the negative electrode of the direct current bus;
and when the first switch and the second switch are closed, the direct current bus insulation monitoring equipment collects the direct current positive and negative electrode insulation resistance value to ground on the direct current bus.
7. The energy storage system insulation fault point positioning system of claim 5, wherein the battery system insulation monitoring device comprises: a third resistor, a fourth resistor, a third switch, a fourth switch, a first connection switch, a second connection switch, a first voltage detection device and a second voltage detection device,
the first connecting switch is arranged between the positive electrode of the battery system and the positive electrode of the direct current bus, and the second connecting switch is arranged between the negative electrode of the battery system and the negative electrode of the direct current bus;
one end of the third switch is connected with the positive electrode of the battery system, the other end of the third switch is connected with one end of the third resistor, the other end of the third resistor is connected with one end of a fourth resistor and is grounded, the other end of the fourth resistor is connected with one end of the fourth switch, and the other end of the fourth switch is connected with the negative electrode of the battery system;
the first voltage detection device is arranged at two ends of the third switch and the third resistor, and the second voltage detection device is arranged at two ends of the fourth switch and the fourth resistor;
when the direct current positive and negative electrode ground insulation resistance value is smaller than a first fault resistance value, the first connecting switch and the second connecting switch are opened, and the third switch and the fourth switch are closed.
8. A computer readable storage medium storing computer instructions for causing the computer to perform the energy storage system insulation fault point locating method according to any one of claims 1-3.
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| CN117686940B (en) * | 2024-02-04 | 2024-04-23 | 上海派能能源科技股份有限公司 | Fault positioning method and circuit of energy storage device |
| CN118011259B (en) * | 2024-04-10 | 2024-08-02 | 厦门和储能源科技有限公司 | Energy storage system insulation fault early warning system and method based on direct current side leakage power |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011067847A1 (en) * | 2009-12-03 | 2011-06-09 | 東芝三菱電機産業システム株式会社 | Secondary battery system |
| CN203455462U (en) * | 2013-08-08 | 2014-02-26 | 许继集团有限公司 | Electric vehicle power battery pack insulation detection apparatus |
| EP2901167A1 (en) * | 2012-09-28 | 2015-08-05 | Renault S.A.S. | Method and device for determining the characteristics of an insulation fault |
| CN206573677U (en) * | 2017-03-14 | 2017-10-20 | 国网江苏省电力公司苏州供电公司 | Signal generator and the straight-flow system insulation fault location instrument based on it |
| CN109061307A (en) * | 2018-09-06 | 2018-12-21 | 北京长城华冠汽车科技股份有限公司 | The method for diagnosing faults of insulating resistor detecting circuit |
| CN109212385A (en) * | 2017-06-29 | 2019-01-15 | 宝沃汽车（中国）有限公司 | The vehicle circuitry insulation detecting method and device of electric car |
| CN110501645A (en) * | 2019-08-02 | 2019-11-26 | 华人运通(江苏)技术有限公司 | Insulation failure detection method, apparatus, electric car and computer storage medium |
| KR20190140697A (en) * | 2018-06-12 | 2019-12-20 | 삼성에스디아이 주식회사 | Ground fault detecting device and method |
| EP3617719A1 (en) * | 2018-08-31 | 2020-03-04 | Contemporary Amperex Technology Co., Limited | Insulation detection method |
| CN110988724A (en) * | 2019-12-24 | 2020-04-10 | 上海电气国轩新能源科技有限公司 | Method, system, medium, and electronic device for detecting insulation failure of battery cluster |
| CN111103508A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Single-point insulation fault positioning calculation method and system |
| CN111624507A (en) * | 2020-07-18 | 2020-09-04 | 国网山西省电力公司电力科学研究院 | Accurate positioning device and method for ground fault of storage battery of direct-current power supply system |
| CN113064029A (en) * | 2021-03-17 | 2021-07-02 | 南京传积兴自动化科技有限公司 | High-voltage direct-current insulation monitoring system and monitoring method |
-
2021
- 2021-12-23 CN CN202111594255.1A patent/CN114325228B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011067847A1 (en) * | 2009-12-03 | 2011-06-09 | 東芝三菱電機産業システム株式会社 | Secondary battery system |
| EP2901167A1 (en) * | 2012-09-28 | 2015-08-05 | Renault S.A.S. | Method and device for determining the characteristics of an insulation fault |
| CN203455462U (en) * | 2013-08-08 | 2014-02-26 | 许继集团有限公司 | Electric vehicle power battery pack insulation detection apparatus |
| CN206573677U (en) * | 2017-03-14 | 2017-10-20 | 国网江苏省电力公司苏州供电公司 | Signal generator and the straight-flow system insulation fault location instrument based on it |
| CN109212385A (en) * | 2017-06-29 | 2019-01-15 | 宝沃汽车（中国）有限公司 | The vehicle circuitry insulation detecting method and device of electric car |
| KR20190140697A (en) * | 2018-06-12 | 2019-12-20 | 삼성에스디아이 주식회사 | Ground fault detecting device and method |
| EP3617719A1 (en) * | 2018-08-31 | 2020-03-04 | Contemporary Amperex Technology Co., Limited | Insulation detection method |
| CN109061307A (en) * | 2018-09-06 | 2018-12-21 | 北京长城华冠汽车科技股份有限公司 | The method for diagnosing faults of insulating resistor detecting circuit |
| CN111103508A (en) * | 2018-10-26 | 2020-05-05 | 上海汽车集团股份有限公司 | Single-point insulation fault positioning calculation method and system |
| CN110501645A (en) * | 2019-08-02 | 2019-11-26 | 华人运通(江苏)技术有限公司 | Insulation failure detection method, apparatus, electric car and computer storage medium |
| CN110988724A (en) * | 2019-12-24 | 2020-04-10 | 上海电气国轩新能源科技有限公司 | Method, system, medium, and electronic device for detecting insulation failure of battery cluster |
| CN111624507A (en) * | 2020-07-18 | 2020-09-04 | 国网山西省电力公司电力科学研究院 | Accurate positioning device and method for ground fault of storage battery of direct-current power supply system |
| CN113064029A (en) * | 2021-03-17 | 2021-07-02 | 南京传积兴自动化科技有限公司 | High-voltage direct-current insulation monitoring system and monitoring method |
Non-Patent Citations (1)
| Title |
|---|
| 蓄电池对地电压与其绝缘关系研究;刘学功;《传电技术》;第29卷(第11期);第36-39页 * |
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