CN116760150B - Fault-tolerant operation method and device for single storage battery fault - Google Patents
Fault-tolerant operation method and device for single storage battery fault Download PDFInfo
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- CN116760150B CN116760150B CN202311017616.5A CN202311017616A CN116760150B CN 116760150 B CN116760150 B CN 116760150B CN 202311017616 A CN202311017616 A CN 202311017616A CN 116760150 B CN116760150 B CN 116760150B
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- 239000000178 monomer Substances 0.000 claims abstract description 60
- 238000013486 operation strategy Methods 0.000 claims abstract description 16
- 238000004458 analytical method Methods 0.000 claims description 90
- 238000005065 mining Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The application discloses a fault-tolerant operation method and device for a single storage battery, wherein the method comprises the steps of collecting voltage and temperature of the single storage battery, and voltage and current data at two ends of a storage battery pack in real time; analyzing the position and the fault type of the fault monomer according to the voltage and the temperature of the storage battery monomer and the voltage and the current data at two ends of the storage battery pack; and determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type. According to the application, the individual monitoring data and the whole monitoring data are obtained by monitoring the storage battery monomers and the storage battery pack respectively, so that the position and the type of the fault monomers are accurately analyzed, and meanwhile, different fault-tolerant operation strategies are adopted based on different fault occurrence conditions, so that the power supply reliability of the direct current system is improved.
Description
Technical Field
The application relates to the technical field of direct current systems of substations, in particular to a fault-tolerant operation method and device for single storage battery faults.
Background
The direct current power supply system of the transformer substation provides reliable power supply for protection, control, automatic devices and the like and is an independent power supply. In normal operation, the charging device bears a constant load and simultaneously charges the storage battery pack to supplement self-discharge of the storage battery pack, so that the storage battery pack is in standby in a full-capacity state. Under the condition of interruption of the alternating current power supply, the storage battery pack continues to provide the direct current power supply for the load, so that the normal operation of the protection, control and automatic device can be ensured.
At present, no matter a double-electric double-charging direct current power supply system or a single-electric single-charging direct current power supply system is powered by a single-series storage battery, any storage battery failure can lead to that the whole storage battery can not supply power to a direct current bus, the direct current bus is out of voltage, and the safe operation of the power system is seriously affected.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a fault-tolerant operation method and device for single storage battery faults, which effectively avoid the problem of failure of the whole storage battery pack caused by single storage battery faults and ensure the reliable operation of a power system. The technical scheme is as follows:
in a first aspect, a fault tolerant operation method for a single battery is provided, including:
collecting voltage and temperature of a storage battery monomer, and voltage and current data at two ends of a storage battery pack in real time;
analyzing the position and the fault type of the fault monomer according to the voltage and the temperature of the storage battery monomer and the voltage and the current data at two ends of the storage battery pack;
and determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type.
In some embodiments, the voltage and the temperature of the battery cells are collected by a voltage sensor and a temperature sensor which are preset and installed on each battery cell, and the voltage and the current data at two ends of the battery pack are collected by a preset and installed voltage and current detection unit connected with the battery pack.
In some embodiments, the fault tolerant operating strategy comprises:
closing a bypass switch at the position of the fault monomer to remove the fault monomer in the storage battery pack;
and dynamically adjusting the voltage and current data output by the voltage compensation unit according to the normal operation voltage of the fault unit, the voltages at two ends of the storage battery and the current data of the storage battery.
In some embodiments, the voltage compensation unit comprises a voltage unit and a current unit, the voltage unit comprises a storage battery and a voltage converter for performing voltage conversion on the storage battery, the current unit comprises an adjustable resistor, the voltage unit is connected with the storage battery in series, the current unit is connected with the storage battery in series, and the voltage unit is connected with the current unit in parallel;
the dynamic adjustment of the voltage and current data output by the voltage compensation unit according to the normal operation voltage of the fault unit, the voltages at two ends of the storage battery and the current data of the storage battery comprises the following steps:
based on the normal operation voltage of the fault unit as a first voltage reference value, based on the difference value between the actual value and the set value of the voltages at two ends of the storage battery pack as a second voltage reference value, determining a first target voltage value of the voltage unit based on the first voltage reference value and the second voltage reference value, and adjusting the voltage converter;
and determining a first target current value of the current unit based on the storage battery current data, and adjusting the resistance value of the adjustable resistor.
In some embodiments, the analyzing the fault cell location and fault type by the battery cell voltage, temperature, battery pack voltage across, current data includes:
determining the number candidate value of single battery faults through voltage and current data at two ends of the storage battery;
determining a first value of a battery cell fault and a location of the first value fault cell based on the battery cell voltage data;
comparing the first numerical value with the number candidate value to determine the correctness of the first numerical value;
determining a second value of battery cell failure and a location of a second value failure cell based on the battery cell temperature data;
the location of the fault cell and the fault type, including but not limited to under-voltage, open-circuit, over-temperature, are determined based on the location of the first numerical fault cell and the location of the second numerical fault cell.
In some embodiments, the fault tolerant operating strategy further comprises:
determining distribution positions of fault monomers of different fault types based on the fault monomer positions and the fault types;
determining distribution characteristics of different fault types based on the distribution positions of the different fault types in the storage battery pack;
predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment;
and removing the monomer to be failed based on the monomer failure data in the storage battery pack within a predicted future second preset time period, wherein the removal method is realized by controlling the closing of a bypass switch corresponding to the position of the monomer.
In some embodiments, predicting the single fault data in the battery pack in the second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment includes:
determining occurrence rules of the same fault and occurrence rules of different faults through association rule mining based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in a first preset time period;
determining the longest fault occurrence time as an analysis time period based on the fault occurrence time corresponding to the occurrence rule;
and acquiring a plurality of analysis time periods by taking the analysis time period as a time unit in a first preset time period before the current moment, acquiring the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the plurality of analysis time periods, analyzing the distribution characteristics in each analysis time period, and acquiring a single fault data prediction result.
In some embodiments, the analyzing the distribution characteristics in each analysis period to obtain the prediction result of the single body fault data includes:
analyzing a first association relationship of distribution of the same fault type in a plurality of analysis time periods through feature vector similarity calculation based on distribution features of the same fault type in the plurality of analysis time periods,
the distribution characteristics of the same fault type in the last analysis time period before the current moment are revised based on the first association relation;
acquiring the distribution characteristics of the same fault type in the last analysis time period after the current moment based on the distribution characteristics of the same fault type in at least one analysis time period with the largest first association relation with the distribution characteristics of the same fault type in the last analysis time period before the current moment;
analyzing a second association relationship between the distribution features of the different fault types based on the distribution features of the different fault types in the plurality of analysis time periods;
determining distribution characteristics of different fault types in the last analysis time period after the current moment based on the distribution characteristics of different fault types in the last analysis time period before the current moment, the distribution characteristics of the same fault type in the last analysis time period after the current moment and the second association relation;
and predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the last analysis time period after the current moment.
In a second aspect, a fault tolerant operation device for a single battery is provided, including:
the data acquisition unit is used for acquiring voltage and temperature of the storage battery monomer, and voltage and current data at two ends of the storage battery pack in real time;
the fault acquisition unit is used for analyzing the position and the fault type of the fault monomer through the voltage and the temperature of the storage battery monomer and the voltage and the current data of the two ends of the storage battery pack;
and the fault-tolerant operation strategy determining unit is used for determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type.
In a third aspect, a computer readable storage medium is provided, on which computer instructions are stored, characterized in that the instructions, when executed by a processor, implement the steps of the above-described battery cell fault tolerant operation method.
The fault-tolerant operation method and device for the single storage battery fault have the following beneficial effects: according to the application, the storage battery monomer is monitored, the storage battery pack is monitored, the storage battery monomer monitoring data and the storage battery pack overall monitoring data are obtained, the position and the type of the fault monomer are accurately analyzed, and meanwhile, different fault-tolerant operation strategies are adopted based on different fault occurrence conditions, so that the power supply reliability of the direct current system is improved.
Drawings
FIG. 1 is a schematic overall flow diagram of a method of fault tolerant operation of a battery cell in an embodiment of the application;
FIG. 2 is a schematic diagram of a method of analyzing fault cell location and fault type in an embodiment of the present application;
FIG. 3 is a schematic diagram of one embodiment of a fault tolerant operating strategy in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a fault-tolerant operation device for battery cells according to an embodiment of the present application.
Detailed Description
The application is further illustrated by the following detailed description.
Referring to fig. 1-3, a fault tolerant operation method for a single battery in an embodiment of the present application includes the following steps:
step 1, collecting voltage and temperature of a storage battery monomer, and voltage and current data at two ends of a storage battery pack in real time;
step 2, analyzing the position and the fault type of the fault monomer according to the voltage and the temperature of the single battery, the voltage and the current data at two ends of the storage battery pack;
and step 3, determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type.
In the embodiment of the application, the storage battery pack supplies power to the bus in a mode of connecting a plurality of storage battery monomers in series, and the individual monitoring data and the whole monitoring data are obtained by monitoring the storage battery monomers and monitoring the storage battery pack respectively, so that the position and the type of the fault monomer are accurately analyzed, different fault-tolerant operation strategies are adopted based on different fault occurrence conditions, and the power supply reliability of the direct current system is improved. It can be understood that based on different fault types of the battery cells, different countermeasures can be adopted respectively, for example, when a plurality of battery cells with continuous positions have the same fault type, deep mining analysis needs to be considered for further fault reasons, the root cause of the fault is located and solved, when one cell in the whole battery pack has one fault, the determined fault of the cell can be determined, the cell can be removed to avoid the influence on normal power supply of the whole battery pack, and whether the cell is replaced or the related circuit of the cell is checked and maintained can be further determined according to the fault type of the cell. Based on the distribution situation of the fault single locations in the whole storage battery pack, different countermeasures can be adopted, for example, if the fault single locations in the whole storage battery pack are fewer, the storage battery pack can still continue to supply power, and if the fault single locations in the whole storage battery pack are more, the standby storage battery pack can be considered to be switched to perform direct current power supply.
Further, in the step 1, the voltage and the temperature of the battery cells are collected by a voltage sensor and a temperature sensor which are preset and installed on each battery cell, and the voltage and the current data at two ends of the battery pack are collected by a voltage and current detection unit which is preset and installed and connected with the battery pack.
Further, in the step 2, analyzing the fault cell position and the fault type according to the voltage and the temperature of the battery cell, the voltage and the current data of the two ends of the battery pack, including:
step 21, determining the number candidate values of single battery faults through voltage and current data at two ends of the storage battery;
step 22, determining a first value of the battery cell fault and a position of the first value fault cell based on the battery cell voltage data;
step 23, comparing the first numerical value with the number candidate value to determine the correctness of the first numerical value;
step 24, determining a second value of the battery cell fault and a position of the second value fault cell based on the battery cell temperature data;
step 25, determining a fault cell location and a fault type based on the location of the first numerical fault cell and the location of the second numerical fault cell, the fault type including, but not limited to, under-voltage, open-circuit, over-temperature.
In the embodiment of the application, whether the single body is abnormal or not can be determined based on the voltage and temperature monitoring data of the single body of the storage battery, meanwhile, the position and the fault type of the single body of the fault are checked by combining the overall voltage and current data of the storage battery to determine, and it can be understood that the voltage and temperature monitoring data of the single body of the storage battery can acquire the single body of the storage battery with faults (under voltage, open circuit and overhigh temperature), and the voltage and current difference data of the single body of the storage battery caused by faults of the overall existence of the storage battery can be determined through the voltage and current data at two ends of the storage battery, and the accurate fault condition of the single body of the storage battery is determined through the combination of the voltage and the current data. It will be appreciated that in the above step 23, if the first value does not meet the number candidate condition, a preset checking and verifying method is required to verify the accuracy of the first value.
Further, the fault-tolerant operation policy in the step 3 includes:
step 31, closing a bypass switch at the position of the fault monomer to remove the fault monomer in the storage battery pack;
and step 32, dynamically adjusting the voltage and current data output by the voltage compensation unit according to the normal operation voltage of the fault single body, the voltages at two ends of the storage battery and the current data of the storage battery so as to enable the storage battery to supply power to the bus normally.
In the embodiment of the application, after the position of the fault monomer is determined, the fault monomer is removed by-pass, and meanwhile, the voltage compensation unit is adopted to keep the normal power supply of the storage battery pack to the bus, so that the bypass switch is understood to be connected in parallel with the two ends of the storage battery monomer, and the fault monomer in the whole storage battery pack is removed when the bypass switch is closed.
Specifically, the voltage compensation unit in the step 32 includes a voltage unit and a current unit, the voltage unit includes a storage battery and a voltage converter for performing voltage conversion on the storage battery, the current unit includes an adjustable resistor, the voltage unit is connected in series with the storage battery, the current unit is connected in series with the storage battery, and the voltage unit is connected in parallel with the current unit;
further, the step 32 dynamically adjusts the voltage and current data output by the voltage compensation unit according to the normal operation voltage of the fault unit, the voltages at two ends of the battery pack, and the current data of the battery pack, and includes:
step 321, determining a first target voltage value of the voltage unit based on the first voltage reference value and the second voltage reference value based on the difference between the actual value and the set value of the voltages at the two ends of the storage battery pack as a first voltage reference value and based on the normal operation voltage of the fault unit, and adjusting the voltage converter;
step 322, determining a first target current value of the current unit based on the battery current data, and adjusting the resistance value of the adjustable resistor.
In the fault-tolerant operation strategy provided by the embodiment of the application, one side of the storage battery is connected with a voltage compensation unit, and the voltage compensation unit simultaneously comprises a voltage unit and a current unit, so that the stability of voltage and current when the storage battery supplies voltage to the bus is ensured after the fault monomers in the storage battery are removed. Further, the voltage supply method of the voltage compensation unit may include the following steps:
determining an adjustment parameter candidate value of the voltage converter based on the accumulated value of the first voltage reference values corresponding to all fault monomers;
starting the voltage unit under the candidate value of the adjustment parameter by the voltage converter;
and adjusting target adjustment values of the voltage converter and the adjustable resistor according to the real-time second voltage reference value and the first target current value.
In one embodiment, in the process of adjusting the voltage converter and the adjustable resistor to the target adjustment value, a step-by-step adjustment process is adopted, and the adjustment step is reduced step by step, so as to avoid fluctuation of the bus voltage and the current.
In one embodiment, the fault tolerant operation policy in step 3 further includes:
step 33, determining distribution positions of fault monomers of different fault types based on the fault monomer positions and the fault types;
step 34, determining distribution characteristics of different fault types based on the distribution positions of the different fault types in the storage battery pack;
step 35, predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment;
and step 36, removing the monomer to be failed based on the monomer failure data in the storage battery pack within a predicted second preset time period in the future, wherein the removing method is realized by controlling the closing of a bypass switch corresponding to the position of the monomer.
The fault-tolerant operation method provided by the embodiment of the application further comprises the step of predicting the possible fault condition in the future under the condition that the existing fault is known to happen, so that the advanced fault-tolerant operation is realized.
In the embodiment of the application, in the single fault data packet in the storage battery pack in the second preset time period in the future, the predicted single fault data comprises fault existence, fault position and fault type data, of course, various data of the predicted single fault data can be determined by the characterization data of the fault type of each unit position in the prediction result, for example, the 1 st type fault is marked as 1, the 2 nd type fault is marked as 2, the no fault is marked as 0, the predicted single fault data of the storage battery single bodies with the position serial numbers of 1-3 can be (0, 1, 2) to indicate that the storage battery single bodies with the 1 st type fault exists, and the 3 rd storage battery single bodies have the 2 nd type fault;
in the embodiment of the application, based on the combination of the distribution characteristics of the same fault type and the distribution characteristics of different fault types, the single fault condition in a second preset time period in the future is predicted by analyzing the association relation of different fault types on time sequence and spatial position, and the association relation of the same fault type on time sequence and spatial position, so that the mutual influence relation between the space-time distribution characteristics of the same fault type and different faults is fully considered, and the effectiveness of early fault-tolerant operation is improved.
Further, the step 35 predicts the single fault data in the storage battery pack in the second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current time, and includes:
step 351, determining occurrence rules of the same fault and occurrence rules of different faults through association rule mining based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in a first preset time period;
step 352, determining the longest fault occurrence time as an analysis time period based on the fault occurrence time corresponding to the occurrence rule;
in step 353, a plurality of analysis time periods are acquired in a first preset time period before the current time by taking the analysis time period as a time unit, the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the plurality of analysis time periods are acquired, and the distribution characteristics in each analysis time period are analyzed to acquire a single fault data prediction result.
In the embodiment of the application, the occurrence rule of the fault occurrence is primarily determined through association rule mining, the longest fault occurrence time is determined as an analysis time period based on the fault occurrence time corresponding to the occurrence rule, a plurality of identical faults or different faults which are mutually influenced or have association relations with each other in the analysis time period can be ensured, and further, the analysis time period is taken as a time unit, each distribution feature in each analysis time period is analyzed, and a single fault data prediction result is obtained. It should be noted that, in the first preset time period before the current time, the plurality of analysis time periods are acquired by taking the analysis time period as a time unit, and the analysis time periods can be intercepted by adopting a sliding window, and the sliding step length is smaller than the analysis time period length, so that the plurality of analysis time periods are ensured to have overlapping sections, and omission of association relations of distribution features in the analysis time periods is avoided. It can be understood that the lengths of the analysis time periods adopted when the distribution features of the same fault type are analyzed separately and the analysis time periods adopted when the distribution features of different fault types are analyzed separately can be consistent or inconsistent, and when the two are inconsistent, the different differences of the space-time distribution features of the same fault type and the space-time distribution features of different fault types are utilized to excavate and analyze the space-time association relationship and the space-time interaction relationship of the faults.
Further, in the step 353, the analysis is performed on the distribution characteristics in each analysis period to obtain the predicted result of the single body fault data, which includes:
step 3531, analyzing a first association relationship of the distribution of the same fault type in the plurality of analysis time periods through feature vector similarity calculation based on the distribution features of the same fault type in the plurality of analysis time periods,
step 3532, re-correcting the distribution characteristics of the same fault type in the last analysis time period before the current moment based on the first association relation;
step 3533, acquiring the distribution characteristics of the same fault type in the last analysis time period after the current time based on the distribution characteristics of the same fault type in at least one analysis time period with the largest first association relation with the distribution characteristics of the same fault type in the last analysis time period before the current time;
step 3534, analyzing a second association relationship between the distribution features of different fault types based on the distribution features of different fault types in the plurality of analysis time periods;
step 3535, determining distribution characteristics of different fault types in the last analysis time period after the current time based on the distribution characteristics of different fault types in the last analysis time period before the current time, the distribution characteristics of the same fault type in the last analysis time period after the current time and the second association relation;
step 3536, predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the last analysis time period after the current time.
In the embodiment of the application, for the distribution analysis of the same fault type, the first association relation of the distribution of the same fault type in a plurality of analysis time periods is fused.
Specifically, the re-correcting the distribution feature of the same fault type in the last analysis time period before the current moment based on the first association relation includes:
acquiring first association relations of the distribution characteristics of the same fault type of a plurality of analysis time periods before the current time and the latest analysis time period, and distributing different weights for the corresponding first association relations according to the time distances between the plurality of analysis time periods and the latest analysis time period before the current time;
and correcting the distribution characteristics of the same fault type in the last analysis time period before the current moment based on the first association relation and the corresponding weight. According to the embodiment of the application, the distribution characteristics of the same fault type in the last analysis time period before the current moment are corrected by analyzing the characteristic relevance and the time influence degree of the plurality of analysis time periods in the last analysis time period before the current moment.
In the embodiment of the application, based on the distribution characteristics of different fault types in a plurality of analysis time periods, the second association relationship between the distribution characteristics of different fault types is analyzed, and the monomer fault data in the last analysis time period after the current time is determined by combining the obtained distribution characteristics of the same fault type in the last analysis time period after the current time, so that it can be understood that the second association relationship represents the interaction relationship between different types of faults.
In an embodiment, the foregoing obtaining the distribution feature of the same fault type in the last analysis period after the current time based on the distribution feature of the same fault type in the at least one analysis period having the largest first association with the distribution feature of the same fault type in the last analysis period before the current time may determine the distribution feature of the same fault type in the last analysis period after the current time based on the distribution feature of the next analysis period of the at least one analysis period having the largest first association.
Referring to fig. 4, the embodiment of the application further provides a fault-tolerant operation device for single battery faults, which comprises:
the data acquisition unit is used for acquiring voltage and temperature of the storage battery monomer, and voltage and current data at two ends of the storage battery pack in real time;
the fault acquisition unit is used for analyzing the position and the fault type of the fault monomer through the voltage and the temperature of the storage battery monomer and the voltage and the current data of the two ends of the storage battery pack;
and the fault-tolerant operation strategy determining unit is used for determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type.
For specific limitations on the battery cell fault tolerant operation device, reference may be made to the above limitation on the battery cell fault tolerant operation method, and no further description is given here. The units in the single battery fault tolerance running device can be realized in whole or in part by software, hardware and a combination thereof. As an example, the battery cell fault tolerance running device provided by the embodiment of the application may be directly embodied as a software module combination executed by a processor, where the software module may be located in a storage medium, and the storage medium is located in a memory, and the processor reads executable instructions included in the software module in the memory, and performs the above battery cell fault tolerance running method in combination with necessary hardware (including, for example, the processor and other components connected to a bus).
The embodiment of the application also provides a computer readable storage medium, on which computer instructions are stored, which is characterized in that the instructions, when executed by a processor, implement the steps of the storage battery cell fault tolerance operation method. It is understood that the computer readable storage medium may be a read-only memory (ROM), a random access memory (random access memory, RAM), a CD-ROM (compact disc read-only memory), a magnetic tape, a floppy disk, an optical data storage node, and the like.
The present application is not limited to the above-described specific embodiments, and various modifications may be made by those skilled in the art without inventive effort from the above-described concepts, and are within the scope of the present application.
Claims (8)
1. A fault tolerant method of battery cell failure comprising:
collecting voltage and temperature of a storage battery monomer, and voltage and current data at two ends of a storage battery pack in real time;
analyzing the position and the fault type of the fault monomer according to the voltage and the temperature of the storage battery monomer and the voltage and the current data at two ends of the storage battery pack;
determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type;
the fault tolerant operation strategy comprises: determining distribution positions of fault monomers of different fault types based on the fault monomer positions and the fault types; determining distribution characteristics of different fault types based on the distribution positions of the different fault types in the storage battery pack; predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment; removing a monomer to be failed based on monomer failure data in a predicted storage battery pack within a second preset time period in the future, wherein the removal method is realized by controlling the closing of a bypass switch corresponding to the position of the monomer;
the predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment comprises the following steps: determining occurrence rules of the same fault and occurrence rules of different faults through association rule mining based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in a first preset time period; determining the longest fault occurrence time as an analysis time period based on the fault occurrence time corresponding to the occurrence rule; and acquiring a plurality of analysis time periods by taking the analysis time period as a time unit in a first preset time period before the current moment, acquiring the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the plurality of analysis time periods, analyzing the distribution characteristics in each analysis time period, and acquiring a single fault data prediction result.
2. The fault-tolerant operation method of the single battery according to claim 1, wherein the voltage and the temperature of the single battery are collected by a voltage sensor and a temperature sensor which are preset and installed on each single battery, and the voltage and the current data at two ends of the storage battery are collected by a voltage and current detection unit which is preset and installed and connected with the storage battery.
3. The battery cell fault tolerant method of claim 1 wherein said fault tolerant operating strategy comprises:
closing a bypass switch at the position of the fault monomer to remove the fault monomer in the storage battery pack;
and dynamically adjusting the voltage and current data output by the voltage compensation unit according to the normal operation voltage of the fault unit, the voltages at two ends of the storage battery and the current data of the storage battery.
4. A fault tolerant method of operation of a battery cell according to claim 3,
the voltage compensation unit comprises a voltage unit and a current unit, the voltage unit comprises a storage battery and a voltage converter for carrying out voltage conversion on the storage battery, the current unit comprises an adjustable resistor, the voltage unit is connected with the storage battery in series, the current unit is connected with the storage battery in series, and the voltage unit is connected with the current unit in parallel;
the dynamic adjustment of the voltage and current data output by the voltage compensation unit according to the normal operation voltage of the fault unit, the voltages at two ends of the storage battery and the current data of the storage battery comprises the following steps:
based on the normal operation voltage of the fault unit as a first voltage reference value, based on the difference value between the actual value and the set value of the voltages at two ends of the storage battery pack as a second voltage reference value, determining a first target voltage value of the voltage unit based on the first voltage reference value and the second voltage reference value, and adjusting the voltage converter;
and determining a first target current value of the current unit based on the storage battery current data, and adjusting the resistance value of the adjustable resistor.
5. The fault tolerant method of claim 1, wherein said analyzing the location of the fault cells and the type of the fault by the voltage, temperature, voltage across the battery, and current data of the battery cells comprises:
determining the number candidate value of single battery faults through voltage and current data at two ends of the storage battery;
determining a first value of a battery cell fault and a location of the first value fault cell based on the battery cell voltage data;
comparing the first numerical value with the number candidate value to determine the correctness of the first numerical value;
determining a second value of battery cell failure and a location of a second value failure cell based on the battery cell temperature data;
and determining the position of the fault single body and the fault type based on the position of the first numerical fault single body and the position of the second numerical fault single body, wherein the fault type comprises undervoltage, open circuit and overhigh temperature.
6. The method for fault-tolerant operation of battery cells according to claim 1, wherein the analyzing the distribution characteristics in each analysis period to obtain the prediction result of the cell fault data comprises:
analyzing a first association relationship of distribution of the same fault type in a plurality of analysis time periods through feature vector similarity calculation based on distribution features of the same fault type in the plurality of analysis time periods,
the distribution characteristics of the same fault type in the last analysis time period before the current moment are revised based on the first association relation;
acquiring the distribution characteristics of the same fault type in the last analysis time period after the current moment based on the distribution characteristics of the same fault type in at least one analysis time period with the largest first association relation with the distribution characteristics of the same fault type in the last analysis time period before the current moment;
analyzing a second association relationship between the distribution features of the different fault types based on the distribution features of the different fault types in the plurality of analysis time periods;
determining distribution characteristics of different fault types in the last analysis time period after the current moment based on the distribution characteristics of different fault types in the last analysis time period before the current moment, the distribution characteristics of the same fault type in the last analysis time period after the current moment and the second association relation;
and predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the last analysis time period after the current moment.
7. A battery cell fault tolerant operation device comprising:
the data acquisition unit is used for acquiring voltage and temperature of the storage battery monomer, and voltage and current data at two ends of the storage battery pack in real time;
the fault acquisition unit is used for analyzing the position and the fault type of the fault monomer through the voltage and the temperature of the storage battery monomer and the voltage and the current data of the two ends of the storage battery pack;
the fault-tolerant operation strategy determining unit is used for determining a corresponding fault-tolerant operation strategy based on the fault single body position and the fault type;
the fault tolerant operation strategy comprises: determining distribution positions of fault monomers of different fault types based on the fault monomer positions and the fault types; determining distribution characteristics of different fault types based on the distribution positions of the different fault types in the storage battery pack; predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment; removing a monomer to be failed based on monomer failure data in a predicted storage battery pack within a second preset time period in the future, wherein the removal method is realized by controlling the closing of a bypass switch corresponding to the position of the monomer;
the predicting single fault data in the storage battery pack in a second preset time period in the future based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the first preset time period before the current moment comprises the following steps: determining occurrence rules of the same fault and occurrence rules of different faults through association rule mining based on the distribution characteristics of the same fault type and the distribution characteristics of different fault types in a first preset time period; determining the longest fault occurrence time as an analysis time period based on the fault occurrence time corresponding to the occurrence rule; and acquiring a plurality of analysis time periods by taking the analysis time period as a time unit in a first preset time period before the current moment, acquiring the distribution characteristics of the same fault type and the distribution characteristics of different fault types in the plurality of analysis time periods, analyzing the distribution characteristics in each analysis time period, and acquiring a single fault data prediction result.
8. A computer readable storage medium having stored thereon computer instructions, which when executed by a processor, implement the steps of the battery cell fault tolerant method of operation of any of claims 1-6.
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