CN110646747B - Fault detection method and device - Google Patents
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Abstract
The invention provides a fault detection method and a fault detection device, wherein an energy storage power supply consists of energy storage power supply modules, each energy storage power supply module consists of a single super capacitor, module voltage of each energy storage power supply module is obtained when the energy storage power supply operates, a module voltage balance value and a module voltage fluctuation value are obtained by calculating based on the module voltage for each energy storage power supply module, whether the module voltage balance value is greater than a first preset threshold value in an acquisition period or not is judged, and whether the module voltage fluctuation value is greater than a second preset threshold value in the acquisition period or not is judged; if the module voltage balance value is larger than a first preset threshold value in the acquisition period and/or the module voltage fluctuation value is larger than a second preset threshold value, determining that the energy storage power supply module has a fault until the determination of all the energy storage power supply modules in the energy storage power supply is completed, detecting whether the energy storage power supply module has the fault or not is realized, and further the purpose of predicting the occurrence of electrolyte leakage or burnout problems of the energy storage power supply is realized.
Description
Technical Field
The invention belongs to the technical field of fault detection, and particularly relates to a fault detection method and device.
Background
A supercapacitor is an electrochemical element that stores energy by polarizing the electrolyte. The super capacitor is different from a traditional chemical power source, is a power source which is arranged between a traditional capacitor and a battery and has special performance, and mainly stores electric energy by electric double layers and redox pseudocapacitance charges. But no chemical reaction occurs in the process of energy storage, and the energy storage process is reversible, and the super capacitor can be repeatedly charged and discharged for tens of thousands of times.
The super capacitor has the characteristics of high power density, long service life and the like, so that the super capacitor is suitable for the field of high-power tramcars and trackless tramcars which are frequently started and stopped. In engineering application, the super capacitors of the single bodies are connected in series or in parallel to form the energy storage power supply module, and the energy storage power supply is formed by the plurality of energy storage power supply modules.
Because the capacity of different monomer super capacitors, the characteristic of internal resistance exist the difference, lead to in the energy storage power module that comprises a plurality of monomer super capacitors monomer super capacitor's the voltage unbalance or the voltage unbalance between the energy storage power module, and then lead to monomer super capacitor's temperature rising for there is the risk that the electrolyte was revealed in the energy storage power, has the danger of energy storage power burnout even.
Therefore, there is a need for a method of detecting whether an energy storage power source comprised of a super capacitor has a fault to predict this risk before the energy storage power source develops an electrolyte leak or burns out.
Disclosure of Invention
In view of the above, the present invention provides a fault detection method and apparatus for solving the problem that it is impossible to predict the occurrence of electrolyte leakage or energy storage power burnout of an energy storage power supply composed of a super capacitor in the prior art.
The technical scheme is as follows:
the invention provides a fault detection method, which comprises the following steps:
respectively acquiring module voltage of each energy storage power module when the energy storage power supply operates; the energy storage power supply module consists of at least one single super capacitor, and the energy storage power supply consists of at least one energy storage power supply module;
respectively calculating to obtain a module voltage balance value and a module voltage fluctuation value based on the module voltage for each energy storage power supply module;
judging whether the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period, and judging whether the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value in the acquisition period;
and if the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in the acquisition period and/or the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value, determining that the energy storage power supply module has a fault until the determination of all energy storage power supply modules included in the energy storage power supply is completed.
Preferably, the obtaining of the module voltage balance value and the module voltage fluctuation value by respectively calculating based on the module voltage includes:
calculating to obtain a module voltage mean value of the energy storage power supply according to the module voltage of each energy storage power supply module included in the energy storage power supply;
calculating the difference value of the module voltage of the energy storage power module and the module voltage mean value of the energy storage power to obtain the module voltage difference value of the energy storage power module;
calculating the sum of all module voltage difference values in the acquisition period to obtain a module voltage balance value of the energy storage power supply module;
calculating the average value of the module voltage of the energy storage power supply module acquired in the acquisition period to obtain the voltage average value of the energy storage power supply module;
and calculating the module voltage fluctuation value of the energy storage power module according to the module voltage of the energy storage power module and the voltage average value of the energy storage power module.
Preferably, the method further comprises the following steps: calculating a voltage balance value of the energy storage power supply according to the module voltage difference of each energy storage power supply module in the energy storage power supply;
judging whether the voltage equilibrium value of the energy storage power supply changes to meet a preset condition;
and if the voltage equilibrium value of the energy storage power supply is judged to be changed to meet the preset condition, determining that the energy storage power supply fails.
Preferably, the determining whether the voltage balance value of the energy storage power supply changes to meet a preset condition includes:
in the EXCEL, a trend graph is established by taking the acquisition time as an abscissa and the voltage equilibrium value of the energy storage power supply as an ordinate;
judging whether a bulge exists in the trend graph or not; if the trend graph has the bulge, the voltage balance value of the energy storage power supply changes to meet the preset condition.
The present application further provides a fault detection device, including:
the acquisition unit is used for respectively acquiring module voltage of each energy storage power module when the energy storage power supply operates; the energy storage power supply module consists of at least one single super capacitor, and the energy storage power supply consists of at least one energy storage power supply module;
the first calculation unit is used for respectively calculating a module voltage balance value and a module voltage fluctuation value based on the module voltage for each energy storage power supply module;
the first judging unit is used for judging whether the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period and judging whether the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value in the acquisition period;
the first determining unit is used for determining that the energy storage power supply module has a fault if the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period and/or the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value until the determination of all energy storage power supply modules included in the energy storage power supply is completed.
Preferably, the first calculation unit is configured to:
calculating to obtain a module voltage mean value of the energy storage power supply according to the module voltage of each energy storage power supply module included in the energy storage power supply; calculating the difference value of the module voltage of the energy storage power module and the module voltage mean value of the energy storage power to obtain the module voltage difference value of the energy storage power module; calculating the sum of all module voltage difference values in the acquisition period to obtain a module voltage balance value of the energy storage power supply module; calculating the average value of the module voltage of the energy storage power module acquired in the acquisition period to obtain the voltage average value of the energy storage power module; and calculating the module voltage fluctuation value of the energy storage power module according to the module voltage of the energy storage power module and the voltage average value of the energy storage power module.
Preferably, the method further comprises the following steps:
the second calculation unit is used for calculating the voltage balance value of the energy storage power supply according to the module voltage difference of each energy storage power supply module included in the energy storage power supply;
the second judgment unit is used for judging whether the voltage equilibrium value of the energy storage power supply changes to meet the preset conditions or not;
and the second determining unit is used for determining that the energy storage power supply fails if the voltage balance value of the energy storage power supply is judged to change according to the preset condition.
Preferably, the second determination unit includes:
the establishing subunit is used for establishing a trend graph by taking the acquisition time as an abscissa and taking the voltage equilibrium value of the energy storage power supply as an ordinate in the EXCEL;
the judging subunit is used for judging whether the trend graph has bulges or not; if the trend graph has the bulge, the voltage balance value of the energy storage power supply changes to meet the preset condition.
Compared with the prior art, the technical scheme provided by the application has the following advantages:
according to the technical scheme, the energy storage power supply comprises at least one energy storage power supply module, the energy storage power supply module comprises at least one single super capacitor, module voltage of each energy storage power supply module is respectively obtained when the energy storage power supply operates, a module voltage balance value and a module voltage fluctuation value are respectively obtained by calculation aiming at each energy storage power supply module based on the module voltage, whether the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period or not is judged, and whether the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value in the acquisition period or not is judged; if the module voltage balance value of the energy storage power supply module is larger than a first preset threshold value in the acquisition period, and/or the module voltage fluctuation value of the energy storage power supply module is larger than a second preset threshold value, determining that the energy storage power supply module has a fault until the determination of all energy storage power supply modules included in the energy storage power supply is completed, detecting whether the energy storage power supply module has the fault, further determining that the energy storage power supply has electrolyte leakage risk or burnout risk, predicting that the energy storage power supply has the fault before the energy storage power supply has the electrolyte leakage or burnout, and avoiding the electrolyte leakage or burnout of the energy storage power supply by taking measures. Meanwhile, the fault detection method can also be used for positioning which energy storage power module in the energy storage power supply has a fault so as to take measures with pertinence. According to the method and the device, the fault of the energy storage power supply module is determined not only according to the fact that the module voltage detected at the current moment exceeds a certain threshold value, but also through the processing of the module voltage of each energy storage power supply module acquired in the sampling period, the fault of the energy storage power supply module is predicted, and the impending fault of the energy storage power supply module can be accurately predicted.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a fault detection method disclosed herein;
FIG. 2 is a flow chart of another fault detection method disclosed herein;
FIG. 3 is a schematic diagram of a trend graph of health status of a module established by the present invention;
FIG. 4 is a schematic diagram of a trend graph of the health of the energy storage power source established by the present invention;
FIG. 5 is a schematic illustration of the output information disclosed herein;
fig. 6 is a schematic structural diagram of a fault detection device disclosed in the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides a fault detection method, whether the energy storage power supply module has a fault or not is determined by detecting a module voltage balance value and a module voltage fluctuation value of an energy storage power supply module consisting of super capacitors, and then the energy storage power supply module can be determined to have the risk of electrolyte leakage or the risk of burning, so that the energy storage power supply is predicted to have the fault before the energy storage power supply has the electrolyte leakage or the burning, and the condition that the electrolyte leakage or the burning of the energy storage power supply is avoided.
Referring to fig. 1, the method may include the steps of:
s101, respectively obtaining module voltage of each energy storage power supply module when an energy storage power supply operates; the energy storage power supply module is composed of at least one monomer super capacitor, and the energy storage power supply is composed of at least one energy storage power supply module.
The voltage imbalance of the single super capacitor leads to the voltage imbalance of the energy storage power supply module, and further the risk of electrolyte leakage and even the burnout of the energy storage power supply are caused to the energy storage power supply.
In this case, when the energy storage power supply operates, the module voltage of the energy storage power supply module is obtained for each energy storage power supply module included in the energy storage power supply.
And S102, respectively calculating to obtain a module voltage balance value and a module voltage fluctuation value based on the module voltage for each energy storage power supply module.
The module voltage balance value represents whether the module voltage of the energy storage power module is balanced in the acquisition period; the module voltage fluctuation value represents the fluctuation of the module voltage of the energy storage power supply module in the acquisition period. The module voltage balance value and the module voltage fluctuation value are indexes for determining whether the energy storage power supply module is in a healthy state.
S103, judging whether the module voltage balance value of the energy storage power supply module is larger than a first preset threshold value in the acquisition period, and judging whether the module voltage fluctuation value of the energy storage power supply module is larger than a second preset threshold value in the acquisition period.
If the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in the acquisition period, and/or the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value, executing step S104;
and if the module voltage balance value of the energy storage power supply module is smaller than a first preset threshold value in the acquisition period and the module voltage fluctuation value of the energy storage power supply module is smaller than a second preset threshold value, determining that the energy storage power supply module has no fault and is in a healthy state.
And if any one of the module voltage balance value and the module voltage fluctuation value does not meet the requirement, determining that the energy storage power supply module has a fault.
Specifically, a first preset threshold value is set for a module voltage balance value, and whether the module voltage balance value is greater than the first preset threshold value is judged; and setting a second preset threshold value aiming at the module voltage fluctuation value, and judging whether the module voltage fluctuation value is greater than the second preset threshold value.
Optionally, in this embodiment, the first preset threshold is set to be 3V, and the second preset threshold is set to be 1.5V.
And S104, determining that the energy storage power supply module has a fault until the determination of all energy storage power supply modules included in the energy storage power supply is completed.
If the module voltage balance value is judged to be larger than a first preset threshold value, and/or the module voltage fluctuation value is judged to be larger than a second preset threshold value, determining that the energy storage power supply module has a fault;
and if the module voltage balance value is judged to be smaller than a first preset threshold value, and the module voltage fluctuation value is judged to be smaller than a second preset threshold value, determining that the energy storage power supply module has no fault.
For each energy storage power module forming the energy storage power supply, whether the energy storage power module has a fault or not can be determined by executing the steps S102 to S104 until the determination of whether the energy storage power module included in the energy storage power supply has the fault or not is completed, and whether the energy storage power supply has the fault or not can be determined according to the condition of whether the energy storage power module has the fault or not, that is, whether the energy storage power supply is in a healthy state or not.
If at least one energy storage power supply module in the energy storage power supply has faults, the energy storage power supply is determined to be in an unhealthy state, and if all the energy storage power supply modules in the energy storage power supply have no faults, the energy storage power supply is determined to be in a healthy state.
According to the technical scheme, the energy storage power supply comprises at least one energy storage power supply module, the energy storage power supply module comprises at least one monomer super capacitor, module voltage of each energy storage power supply module is respectively obtained when the energy storage power supply operates, a module voltage balance value and a module voltage fluctuation value are respectively obtained by calculation based on the module voltage for each energy storage power supply module, whether the module voltage balance value of the energy storage power supply module is larger than a first preset threshold value in an acquisition period or not is judged, and whether the module voltage fluctuation value of the energy storage power supply module is larger than a second preset threshold value in the acquisition period or not is judged; if the module voltage balance value of the energy storage power supply module is larger than a first preset threshold value in the acquisition period, and/or the module voltage fluctuation value of the energy storage power supply module is larger than a second preset threshold value, determining that the energy storage power supply module has a fault until the determination of all energy storage power supply modules included in the energy storage power supply is completed, detecting whether the energy storage power supply module has the fault, further determining that the energy storage power supply has electrolyte leakage risk or burnout risk, predicting that the energy storage power supply has the fault before the energy storage power supply has the electrolyte leakage or burnout, and avoiding the electrolyte leakage or burnout of the energy storage power supply by taking measures. Meanwhile, the fault detection method can also be used for positioning which energy storage power module in the energy storage power supply has a fault so as to take measures with pertinence.
The specific manner of obtaining the module voltage balance value based on the module voltage calculation and obtaining the module voltage fluctuation value based on the module voltage calculation is described in detail below.
The mode of calculating the module voltage balance value is as follows:
step one, calculating to obtain a module voltage average value of the energy storage power supply according to the module voltage of each energy storage power supply module included in the energy storage power supply.
The module voltage mean value refers to the mean value of all energy storage power modules in the energy storage power supply at the acquisition moment.
Calculating the module voltage mean value of the energy storage power supply by adopting a formula (1):
in the formula (1), the first and second groups,
is the average value of the module voltage of the energy storage power supply, N is the number of the energy storage power supply modules forming the energy storage power supply, eu，iThe module voltage of the ith energy storage power module in the energy storage power supply.
And step two, calculating the difference value of the module voltage of the energy storage power module and the module voltage mean value of the energy storage power to obtain the module voltage difference value of the energy storage power module.
The module voltage difference of the energy storage power module refers to the module voltage of the energy storage power module at the moment of collection and the module voltage mean value of the energy storage power
The absolute value of the difference of (2).
Calculating the module voltage difference of the energy storage power module by adopting a formula (2):
in the formula (2), ηiIs the module voltage difference of the ith energy storage power module eu，iIs the module voltage of the ith energy storage power module,
the average value of the module voltage of the energy storage power supply is obtained.
And step three, calculating the sum of all module voltage difference values in the acquisition period to obtain the module voltage balance value of the energy storage power supply module.
The module voltage balance value of the energy storage power module refers to the sum of the module voltage differences of the energy storage power module in the sampling period. The sampling period is 30 days or more, and the operation of sampling the module voltage of the energy storage power module is executed once every preset time in one sampling period.
Calculating a module voltage balance value of the energy storage power supply module by adopting a formula (3):
in the formula, Eη，iThe module voltage balance value of the ith energy storage power supply module is T, the number of sampling moments in a sampling period is etat，iAnd sampling the module voltage difference of the ith energy storage power module at the moment t.
The mode of calculating the module voltage fluctuation value is as follows:
step one, calculating an average value of the module voltage of the energy storage power supply module collected in a collection period to obtain a voltage average value of the energy storage power supply module.
The voltage average value of the energy storage power module refers to the average value of the module voltage of the energy storage power module in the sampling period.
Calculating the voltage average value of the energy storage power supply module by adopting a formula (4):
in the formula (4)
The voltage average value of the ith energy storage power supply module in the sampling period is shown, T is the number of sampling moments in the sampling period, eu，tFor acquisition at the sampling time tModule voltage of the ith energy storage power module.
And secondly, calculating the module voltage fluctuation value of the energy storage power module according to the module voltage of the energy storage power module and the voltage average value of the energy storage power module.
The module voltage fluctuation value of the energy storage power module refers to the standard deviation of the module voltage of the energy storage power module in the sampling period.
Calculating the module voltage fluctuation value of the energy storage power supply module by adopting a formula (5):
in the formula (5), Es，iThe module voltage fluctuation value of the energy storage power supply module, T is the number of sampling moments in a sampling period, eu，tThe module voltage of the ith energy storage power module collected at the sampling time t,
the voltage average value of the ith energy storage power supply module in the sampling period is obtained.
The fault detection method disclosed in the above embodiment determines whether the energy storage power supply has a fault only according to whether the energy storage power supply module has a fault, and in practical application, may also determine whether the energy storage power supply has a fault directly based on the parameters of the energy storage power supply itself.
Referring to fig. 2, on the basis of fig. 1, the method further includes:
s201, calculating a voltage balance value of the energy storage power supply according to the module voltage difference of each energy storage power supply module included in the energy storage power supply.
The voltage balance value of the energy storage power supply refers to the square sum of module voltage difference values of all energy storage power supply modules in the energy storage power supply.
And (3) calculating a voltage equilibrium value of the energy storage power supply by adopting a formula (6):
in the formula (6), Eη，tIs the voltage equilibrium value of the energy storage power supply at the moment of t sampling, N is the total number of energy storage power supply modules included in the energy storage power supply, etaiIs the module voltage difference of the ith energy storage power module.
S202, judging whether the voltage balance value of the energy storage power supply changes to meet a preset condition;
if the voltage balance value of the energy storage power supply is judged to be changed to meet the preset condition, executing the step S203;
and if the voltage equilibrium value of the energy storage power supply is judged not to be changed to meet the preset condition, determining that the energy storage power supply is in a healthy state without failure.
The preset condition refers to that the voltage equalization value increases in a short time.
One implementation way of judging whether the voltage balance value of the energy storage power supply changes to meet the preset condition is to determine whether a bulge exists in the curve.
Specifically, in EXCEL, a trend graph is established by taking the acquisition time as an abscissa and the voltage equilibrium value of the energy storage power supply as an ordinate, and whether a bulge exists in the trend graph is judged; if the trend graph has the bulge, the voltage balance value of the energy storage power supply changes to meet the preset condition; if the trend graph does not have the bulge, the voltage balance value of the energy storage power supply does not change to meet the preset condition.
And S203, determining that the energy storage power supply has a fault.
In the following, the detection of an energy storage power supply composed of super capacitors applied in an urban rail transit scene is taken as an example. The energy storage power supply is composed of 40 groups of energy storage power supply modules, and the sampling period is set to be 30 days.
For each group of energy storage power supply modules, the module voltage of the energy storage power supply module can be collected and then stored in an EXCEL table according to the collection time sequence.
Referring to table 1, the module voltage of each energy storage power module is respectively collected within 30 days of the sampling period.
TABLE 1
In table 1, the first column is the acquisition time within one sampling period. And each row behind the first row is respectively the module voltage acquired by one energy storage power module at each acquisition moment.
It should be noted that the module voltages collected at one sampling time are only shown in table 1 on the same day, and actually, there are a plurality of different sampling times on the same day, and the module voltages of the energy storage power modules are collected at different sampling times.
In order to facilitate the subsequent detection of whether the energy storage power supply module or the energy storage power supply has a fault according to the module voltage of each energy storage power supply module, invalid data in the EXCEL needs to be cleaned, and invalid row data and column data can be deleted according to the valid range of the data.
Calculating module voltage equalization value E based on the introductionη，iThe module voltage balance value is calculated, and the module voltage fluctuation value E is calculated based on the above-described method of calculating the module voltage fluctuation valueS，iAnd storing the calculated module voltage balance value Eη，iAnd module voltage fluctuation value ES，i。
In practical application, the mean value of the module voltage of the energy storage power supply can be obtained by calculation according to the formula (1) by means of an EXCEL function
And calculating the module voltage difference eta of the energy storage power supply module by using an EXCEL function and adopting a formula (2)iAnd the module voltage difference eta of the energy storage power moduleiStoring the data in the form of column data in an EXCEL table; and finally, calculating by using an EXCEL function and adopting a formula (3) to obtain a module voltage balance value E of the energy storage power supply moduleη，i. And the module voltage equalization value E of the energy storage power moduleη，iStored in the EXCEL table as line data.
Similarly, the voltage average value of the energy storage power supply module can be obtained by means of the EXCEL function and calculation according to the formula (4)
Then, the module voltage fluctuation value E of the energy storage power supply module is obtained by means of the EXCEL function and calculation according to the formula (5)S，i. And the module voltage fluctuation value E of the energy storage power supply moduleS，iStored in the EXCEL table as line data.
Calculating to obtain the voltage balance value E of the energy storage power supply by using an EXCEL function and adopting a formula (6)η，tAnd equalizing the voltage E of the energy storage power supplyη，tStored in the EXCEL table in the form of column data.
In the EXCEL table, the module voltage balance value E of the energy storage power moduleη，iAnd the module voltage fluctuation value E of the energy storage power supply moduleS，iAnd establishing a trend graph of the health state of the module for the data source. Referring to fig. 3, the abscissa represents the energy storage power module, and the ordinate represents the module voltage fluctuation value E of the energy storage power moduleS，iAnd module voltage balance value E of energy storage power supply moduleη，i。
The health state of each energy storage power module is determined through fig. 3, and if the module voltage balance value of the 16 th energy storage power module in fig. 3 is greater than 3V, it is determined that the 16 th energy storage power module has a fault.
In EXCEL table, by voltage equalization value E of energy storage power supplyη，tAnd as a data source, establishing a trend chart of the health state of the energy storage power supply. Referring to fig. 4, the ordinate is the voltage equalization value of the energy storage power supply, and the abscissa is the sampling frequency.
Referring to fig. 4, when sampling is performed at 3699 th time, the trend graph shows that a protrusion exists, that is, the voltage equilibrium value of the energy storage power supply increases in a short time, the value of the protrusion is greater than 30V, and the value of the protrusion shows a continuously expanding trend during subsequent sampling, so that it is determined that the energy storage power supply has a fault at the sampling time corresponding to the sampling, and the energy storage power supply is in an unhealthy state.
In practical application, after the energy storage power supply is predicted to be in an unhealthy state, the method further comprises the following steps: and outputting prompt information to perform early warning.
The impending fault can be accurately predicted by the fault detection method disclosed by the application. Referring to fig. 5, the failure information is output after the train system actually has a failure.
The output prompt information comprises the contents of a fault train, a fault code, a fault grade, a fault train, a fault system, a fault name, fault occurrence time, fault ending time and detailed information.
The fault train refers to a train which supplies electric energy by applying a fault energy storage power supply;
the fault vehicle refers to a vehicle on a train which is powered by an energy storage power supply with a fault;
the failure system refers to a vehicle system which supplies electric energy by applying a failure-existing energy storage power supply.
The fault code is used to uniquely identify the fault, from which it can be determined what type of fault has occurred.
The failure level refers to a level classified according to the severity of the failure.
The failure name refers to the name of the existing failure.
The failure occurrence time refers to a time when a failure occurs, and the failure end time refers to a time when the failure ends.
The fault detection method is used for providing details about the fault in detail and providing effective basis for performing corresponding measures aiming at the fault subsequently.
As can be seen from fig. 5, the actual fault name is the 16 th module voltage low voltage of the energy storage power supply, which is consistent with the 16 th energy storage power supply module predicted by the fault detection method of the present application, and the effect of accurately predicting the fault is achieved.
Corresponding to the fault detection method disclosed in the above embodiment, the present application also provides a fault detection apparatus. Referring to fig. 6, the apparatus includes:
an acquisition unit 601, a first calculation unit 602, a first judgment unit 603, and a first determination unit 604.
The acquiring unit 601 is used for respectively acquiring module voltages of the energy storage power modules when the energy storage power supply operates; the energy storage power supply module consists of at least one single super capacitor, and the energy storage power supply consists of at least one energy storage power supply module;
the first calculating unit 602 is configured to calculate, for each energy storage power module, a module voltage balance value and a module voltage fluctuation value based on the module voltage.
Optionally, the first computing unit 602 is configured to: calculating the module voltage mean value of the energy storage power supply according to the module voltage of each energy storage power supply module included in the energy storage power supply; calculating the difference value of the module voltage of the energy storage power module and the module voltage mean value of the energy storage power to obtain the module voltage difference value of the energy storage power module; calculating the sum of all module voltage difference values in the acquisition period to obtain a module voltage balance value of the energy storage power supply module; calculating the average value of the module voltage of the energy storage power supply module acquired in the acquisition period to obtain the voltage average value of the energy storage power supply module; and calculating the module voltage fluctuation value of the energy storage power module according to the module voltage of the energy storage power module and the voltage average value of the energy storage power module.
A first judging unit 603, configured to judge whether a module voltage balance value of the energy storage power module is greater than a first preset threshold in an acquisition period, and judge whether a module voltage fluctuation value of the energy storage power module is greater than a second preset threshold in the acquisition period;
the first determining unit 604 is configured to determine that the energy storage power module has a fault until the determination of all energy storage power modules included in the energy storage power is completed if the module voltage balance value of the energy storage power module is greater than a first preset threshold in the acquisition period and/or the module voltage fluctuation value of the energy storage power module is greater than a second preset threshold.
According to the technical scheme, the energy storage power supply comprises at least one energy storage power supply module, the energy storage power supply module comprises at least one single super capacitor, module voltage of each energy storage power supply module is respectively obtained when the energy storage power supply operates, a module voltage balance value and a module voltage fluctuation value are respectively obtained by calculating based on the module voltage for each energy storage power supply module, whether the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period or not is judged, and whether the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value in the acquisition period or not is judged; if the module voltage balance value of the energy storage power supply module is larger than a first preset threshold value in the acquisition period, and/or the module voltage fluctuation value of the energy storage power supply module is larger than a second preset threshold value, determining that the energy storage power supply module has a fault until the determination of all energy storage power supply modules included in the energy storage power supply is completed, detecting whether the energy storage power supply module has the fault, further determining that the energy storage power supply has electrolyte leakage risk or burnout risk, predicting that the energy storage power supply has the fault before the energy storage power supply has the electrolyte leakage or burnout, and avoiding the electrolyte leakage or burnout of the energy storage power supply by taking measures. Meanwhile, the fault detection method can also be used for positioning which energy storage power module in the energy storage power supply has a fault so as to take measures with pertinence.
Optionally, in another embodiment, the fault detection apparatus further includes:
a second calculation unit 605, a second determination unit 606 and a second determination unit 607.
A second calculating unit 605, configured to calculate a voltage balance value of the energy storage power source according to a module voltage difference of each energy storage power module included in the energy storage power source;
a second determining unit 606, configured to determine whether a voltage balance value of the energy storage power supply changes to meet a preset condition;
the second determining unit 607 is configured to determine that the energy storage power source fails if it is determined that the voltage balance value of the energy storage power source changes according to a preset condition.
Optionally, the second determination unit 607 includes:
establishing a subunit and judging the subunit.
The establishing subunit is used for establishing a trend graph in the EXCEL by taking the acquisition time as an abscissa and the voltage equilibrium value of the energy storage power supply as an ordinate;
the judging subunit is used for judging whether the trend graph has a bulge or not; if the trend graph has the bulge, the voltage balance value of the energy storage power supply changes to meet the preset condition.
Through the technical scheme, whether the energy storage power supply has faults or not can be determined directly based on the parameters of the energy storage power supply.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method of fault detection, comprising:
respectively acquiring module voltage of each energy storage power module when the energy storage power supply operates; the energy storage power supply module consists of at least one single super capacitor, and the energy storage power supply consists of at least one energy storage power supply module;
respectively calculating to obtain a module voltage balance value and a module voltage fluctuation value based on the module voltage for each energy storage power supply module;
judging whether the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period, and judging whether the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value in the acquisition period;
if the module voltage balance value of the energy storage power supply module is larger than a first preset threshold value in the acquisition period and/or the module voltage fluctuation value of the energy storage power supply module is larger than a second preset threshold value, determining that the energy storage power supply module has a fault until the determination of all energy storage power supply modules included in the energy storage power supply is completed;
the step of respectively calculating a module voltage balance value and a module voltage fluctuation value based on the module voltage comprises the following steps:
according to the module voltage of every energy storage power module that includes in this energy storage power, calculate the module voltage mean value that obtains this energy storage power, include: using a formula
Calculating a module voltage mean value of the energy storage power supply; wherein,
is the module voltage mean value of the energy storage power supply, N is the number of energy storage power supply modules forming the energy storage power supply, eu，iThe module voltage of the ith energy storage power module in the energy storage power supply is obtained;
calculating the difference value between the module voltage of the energy storage power supply module and the module voltage mean value of the energy storage power supply to obtain the module voltage difference value of the energy storage power supply module, and the method comprises the following steps: using formulas
Calculating the module voltage difference of the energy storage power module; wherein eta isiIs the module voltage difference of the ith energy storage power module eu，iIs the module voltage of the ith energy storage power module,
the average value of the module voltage of the energy storage power supply is obtained;
calculating the sum of all module voltage differences in the acquisition period to obtain a module voltage balance value of the energy storage power supply module, and the method comprises the following steps: using formulas
Calculating a module voltage balance value; wherein E isη，iModule of ith energy storage power moduleThe voltage equilibrium value, T is the number of sampling moments in the sampling period, etat，iSampling the module voltage difference of the ith energy storage power module at the moment t;
calculate the average value of the module voltage of this energy storage power module of gathering in the collection cycle, obtain the voltage average value of this energy storage power module, include: using formulas
Calculating a voltage average value of the energy storage power supply module; wherein,
the voltage average value of the ith energy storage power supply module in a sampling period, T is the number of sampling moments in the sampling period, eu，tThe module voltage of the ith energy storage power module is acquired at the t sampling moment;
according to the module voltage of this energy storage power module and the voltage mean value of this energy storage power module, calculate the module voltage fluctuation value of this energy storage power module, include: using formulas
Calculating a module voltage fluctuation value of the energy storage power module; wherein E isS，iThe module voltage fluctuation value of the energy storage power supply module, T is the number of sampling moments in a sampling period, eu，tThe module voltage of the ith energy storage power module collected at the sampling time t,
the voltage average value of the ith energy storage power supply module in the sampling period is obtained;
the module voltage balance value represents whether the module voltage of the energy storage power supply module is balanced or not in the acquisition period; and the module voltage fluctuation value represents the fluctuation of the module voltage of the energy storage power supply module in the acquisition period.
2. The method of claim 1, further comprising: calculating a voltage balance value of the energy storage power supply according to the module voltage difference of each energy storage power supply module included in the energy storage power supply;
judging whether the voltage equilibrium value of the energy storage power supply changes to meet a preset condition;
and if the voltage equilibrium value of the energy storage power supply is judged to be changed to meet the preset condition, determining that the energy storage power supply fails.
3. The method of claim 2, wherein the determining whether the voltage balance value of the energy storage power supply changes to satisfy a predetermined condition comprises:
in the EXCEL, a trend graph is established by taking the acquisition time as an abscissa and the voltage equilibrium value of the energy storage power supply as an ordinate;
judging whether a bulge exists in the trend graph or not; if the trend graph has the bulge, the voltage balance value of the energy storage power supply changes to meet the preset condition.
4. A fault detection device, comprising:
the acquisition unit is used for respectively acquiring module voltage of each energy storage power module when the energy storage power supply operates; the energy storage power supply module consists of at least one single super capacitor, and the energy storage power supply consists of at least one energy storage power supply module;
the first calculation unit is used for respectively calculating a module voltage balance value and a module voltage fluctuation value based on the module voltage for each energy storage power supply module;
the first judging unit is used for judging whether the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period and judging whether the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value in the acquisition period;
the first determining unit is used for determining that the energy storage power supply module has a fault if the module voltage balance value of the energy storage power supply module is greater than a first preset threshold value in an acquisition period and/or the module voltage fluctuation value of the energy storage power supply module is greater than a second preset threshold value until the determination of all energy storage power supply modules included in the energy storage power supply is completed;
the first computing unit is to: according to the module voltage of each energy storage power supply module included in the energy storage power supply, the module voltage mean value of the energy storage power supply is calculated, and the method comprises the following steps: using formulas
Calculating a module voltage mean value of the energy storage power supply; wherein,
is the module voltage mean value of the energy storage power supply, N is the number of energy storage power supply modules forming the energy storage power supply, eu，iThe module voltage of the ith energy storage power module in the energy storage power supply is obtained;
calculating the difference value between the module voltage of the energy storage power module and the module voltage mean value of the energy storage power to obtain the module voltage difference value of the energy storage power module, including: using formulas
Calculating the module voltage difference of the energy storage power module; wherein eta isiIs the module voltage difference of the ith energy storage power module eu，iIs the module voltage of the ith energy storage power module,
the average value of the module voltage of the energy storage power supply is obtained;
calculating the sum of all module voltage differences in the acquisition period to obtain the module voltage balance value of the energy storage power supply module, including: using a formula
Calculating a module voltage balance value; wherein E isη，iThe module voltage balance value of the ith energy storage power supply module, T is the number of sampling moments in a sampling period, etat，iSampling the module voltage difference of the ith energy storage power module at the moment t;
calculate the average value of the module voltage of this energy storage power module of gathering in the collection cycle, obtain the voltage average value of this energy storage power module, include: using formulas
Calculating the voltage average value of the energy storage power supply module; wherein,
the voltage average value of the ith energy storage power supply module in the sampling period is shown, T is the number of sampling moments in the sampling period, eu，tThe module voltage of the ith energy storage power module is acquired at the t sampling moment;
according to the module voltage of this energy storage power module and the voltage mean value of this energy storage power module, calculate the module voltage fluctuation value of this energy storage power module, include: using a formula
Calculating a module voltage fluctuation value of the energy storage power supply module; wherein, ES，iThe module voltage fluctuation value of the energy storage power supply module, T is the number of sampling moments in a sampling period, eu，tThe module voltage of the ith energy storage power module collected at the sampling moment t,
the voltage average value of the ith energy storage power supply module in the sampling period is obtained;
the module voltage balance value represents whether the module voltage of the energy storage power supply module is balanced or not in the acquisition period; and the module voltage fluctuation value represents the fluctuation of the module voltage of the energy storage power supply module in the acquisition period.
5. The fault detection device of claim 4, further comprising:
the second calculation unit is used for calculating the voltage balance value of the energy storage power supply according to the module voltage difference of each energy storage power supply module included in the energy storage power supply;
the second judgment unit is used for judging whether the voltage equilibrium value of the energy storage power supply changes to meet the preset conditions or not;
and the second determining unit is used for determining that the energy storage power supply fails if the voltage balance value of the energy storage power supply is judged to change according to the preset condition.
6. The failure detection apparatus according to claim 5, wherein the second determination unit includes:
the establishing subunit is used for establishing a trend graph in the EXCEL by taking the acquisition time as an abscissa and the voltage equilibrium value of the energy storage power supply as an ordinate;
the judging subunit is used for judging whether the trend graph has bulges or not; if the trend graph has the bulge, the voltage balance value of the energy storage power supply changes to meet the preset condition.
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