WO2019237704A1

WO2019237704A1 - Method and system for detecting leakage abnormality of capacitor, and computer device

Info

Publication number: WO2019237704A1
Application number: PCT/CN2018/122278
Authority: WO
Inventors: 张伟先; 文午; 胡润文; 李玉梅; 张婷婷; 陈朝晖; 付亚娥; 柯建明; 陈盛才; 付鹏
Original assignee: 中车株洲电力机车有限公司
Priority date: 2018-06-13
Filing date: 2018-12-20
Publication date: 2019-12-19
Also published as: DE112018007722T5; CN108802554A; CN108802554B

Abstract

A method and a system for detecting a leakage abnormality of a capacitor, and a computer device. Said method comprises: acquiring a voltage value V1 of a capacitor at a first time T1, and a voltage value V2 of the capacitor at a second time T2, the capacitor being isolated between the first time T1 and the second time T2 (S11); using T1, T2, V1, V2 and a pre-stored parameter of the capacitor to calculate an average leakage current I of the capacitor within a duration from T1 to T2 (S12); determining whether the average leakage current I exceeds a preset threshold; and if so, determining a leakage abnormality of the capacitor (S13). An abnormal state of the capacitor is determined by calculating a voltage change of the capacitor after the capacitor is placed in isolation for a duration and by calculating an average leakage current of the capacitor within the duration and determining whether the average leakage current is normal, so as to conveniently detect a leakage abnormality of the capacitor, being simple, reliable and practical.

Description

Capacitive leakage abnormal detection method and system, computer equipment

This application claims the priority of a Chinese patent application filed on June 13, 2018 with the Chinese Patent Office, application number 201810608157.0, and invention name "A Capacitive Leakage Abnormality Detection Method and System, Computer Equipment", the entire contents of which are incorporated by reference Incorporated in this application.

Technical field

The present invention relates to the technical field of equipment detection, and in particular, to a method and system for detecting an abnormality of capacitor leakage, and computer equipment.

Background technique

A capacitor, as its name suggests, is a 'container for charging', a device that holds a charge. As a new type of charge energy storage element, supercapacitor has the characteristics of large capacity, large current fast charge and discharge, long life and no pollution. However, the super capacitor has a low rated voltage. In actual references, multiple super capacitors are generally combined in series and parallel to form a super capacitor energy storage power supply to meet the needs of energy storage capacity and voltage level. However, due to the influence of manufacturing process, the capacity, equivalent parallel internal resistance, and other parameters of the same type of supercapacitors are different, the leakage voltage is not the same, and this parameter will change over time. Under the conditions of high-current cycling charge and discharge, it will cause overvoltage and undervoltage of certain cells, affecting the reliable operation of supercapacitors, affecting the operation of the entire energy storage power supply, and also affecting the life of the cells.

Conventional supercapacitor leakage detection schemes are performed one-on-one in the laboratory with testing equipment. The measurement is accurate but slow, and can only be performed on the test line. In the practical application of energy storage power, only after the fault of overvoltage and undervoltage occurs, after removing the faulty unit (super capacitor), the specific cause of the fault can be determined in the laboratory test.

Therefore, how to provide a more convenient method for detecting capacitor leakage anomaly, which is simple, reliable and practical, is a technical problem to be solved urgently by those skilled in the art.

Summary of the Invention

In view of this, an object of the present invention is to provide a method and a system for detecting a leakage current of a capacitor, and a computer device, which can more conveniently detect a leakage abnormality of a capacitor, which is simple, reliable, and practical. The specific scheme is as follows:

According to a first aspect, the present invention provides a method for detecting an abnormality of capacitor leakage, including:

Obtain the voltage value V1 of the capacitor at the first time T1, and isolate and place the voltage value V2 at the second time T2 after the first time T1;

Using the pre-stored parameters of the T1, the T2, the V1, the V2, and the capacitor to calculate an average leakage current I of the capacitor in the time period from T1 to T2;

It is determined whether the average leakage current I exceeds a preset threshold; if yes, it is determined that the capacitor leakage is abnormal.

According to a second aspect, the present invention provides a method for detecting an abnormality of a capacitor leakage, which is applied to the leakage detection of a supercapacitor of a tramcar energy storage power supply, including:

Obtaining the voltage value V1 of the first supercapacitor of the railcar energy storage power supply when the first time T1 is deactivated, and isolating and placing the voltage value V2 when the second time T2 is activated after the first time T1;

Use the pre-stored parameters of the T1, the T2, the V1, the V2, and the first supercapacitor of the tram vehicle energy storage power supply to calculate the first supercapacitor of the tram vehicle energy storage power supply at all locations. The first average leakage current I in the period from T1 to T2;

It is determined whether the first average leakage current I exceeds a preset threshold; if yes, it is determined that the leakage of the first super capacitor is abnormal.

Preferably,

Before the determining whether the first average leakage current I exceeds a preset threshold; and if yes, determining that the first supercapacitor has an abnormal leakage, the method further includes:

Calculating an average leakage current of all supercapacitors of the tramcar energy storage power source under the same conditions as the first average leakage current I;

The average leakage current of all supercapacitors is averaged again to obtain a preset threshold.

Preferably,

Setting the first historical leakage current to a preset threshold;

The first historical leakage current is a first average leakage current that has not been determined to be an abnormal leakage current in the history of the first ultracapacitor.

Preferably,

The obtaining the voltage value V1 of the first supercapacitor of the energy storage power supply of the tram when the T1 is deactivated at the first moment includes:

Get the real-time voltage value of the weak power supply;

Determining whether the real-time voltage value is less than a preset voltage value;

If it is, then it is recorded that it is the first time T1 at this time, and accordingly, the voltage value of the first super capacitor at this time is V1;

Wherein, a capacitor is connected in parallel with the weak electric power supply.

In a third aspect, the present invention provides a capacitor leakage abnormality detection system, which is applied to the leakage detection of a supercapacitor of a tram vehicle energy storage power supply, including:

The voltage moment acquisition module is used to obtain the voltage value V1 of the first supercapacitor of the streetcar energy storage power supply when the first moment T1 is deactivated, and is isolated and placed after the first moment T1 until the second moment T2 is activated Voltage value V2;

The leakage current calculation module is configured to use the T1, the T2, the V1, the V2, and a pre-stored parameter of the first supercapacitor of the railcar energy storage power source to calculate the railcar energy storage power source A first average leakage current I of the first supercapacitor in the time period from T1 to T2;

An abnormality determining module is configured to determine whether the first average leakage current I exceeds a preset threshold; if yes, determine that the first ultracapacitor is leaking abnormally.

Preferably, it further comprises:

A first leakage current calculation module, configured to calculate an average leakage current of all supercapacitors of the streetcar energy storage power source under the same conditions as the first average leakage current I;

The first threshold obtaining module is configured to obtain an average of the average leakage currents of all supercapacitors again to obtain a preset threshold.

Preferably, it further comprises:

A second threshold obtaining module, configured to set the first historical leakage current to a preset threshold;

Preferably,

The voltage time obtaining module includes:

Weak voltage acquisition unit, used to obtain the real-time voltage value of the weak power supply;

A voltage value judgment module, configured to determine whether the real-time voltage value is less than a preset voltage value;

The voltage value time recording unit is configured to record a first time T1 at this time if it is determined that the real-time voltage value is less than a preset voltage value, and accordingly, the voltage value of the first super capacitor at this time is V1;

In a fourth aspect, the present invention provides a monitoring computer device, including:

Memory for storing computer programs;

A processor, configured to implement the steps of any one of the foregoing methods for detecting a capacitor leakage abnormality when the computer program is executed.

The invention provides a method for detecting a capacitor leakage abnormality, which comprises: obtaining a voltage value V1 of a capacitor at a first time T1, and isolating and placing the voltage value V2 of a capacitor after a first time T1 to a second time T2; using the T1, the T2, the pre-stored parameters of the V1, the V2, and the capacitor, and calculate an average leakage current I of the capacitor in the time period from T1 to T2; determine whether the average leakage current I exceeds a preset threshold; If so, it is determined that the capacitor leakage is abnormal. The invention calculates the voltage change of the capacitor after it has been isolated for a period of time, calculates the average leakage current of the capacitor during this time, and judges whether the average leakage current is normal, so as to judge the abnormal state of the capacitor, so as to further It is convenient, reliable and practical to detect the abnormal leakage of the capacitor.

In particular, when the method is applied to the leakage detection of the supercapacitors of the energy storage power supply of the tram, it can better adapt to the operating rules of the tram. When the supercapacitor of the tram's energy storage power supply is activated, the voltage is measured again, so that the average leakage current of the supercapacitor during this time can be calculated, and whether the supercapacitor is normal or not.

The present invention also provides a capacitor leakage abnormality detection system and computer equipment, which also have the above-mentioned beneficial effects, and will not be repeated here.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly explain 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. Obviously, the drawings in the following description are merely It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without paying creative labor.

FIG. 1 is a flowchart of a method for detecting a capacitor leakage abnormality according to a specific embodiment of the present invention; FIG.

FIG. 2 is a flowchart of a method for detecting a capacitor leakage abnormality according to another embodiment of the present invention; FIG.

3 is a schematic structural diagram of a capacitor leakage abnormality detection system according to another embodiment of the present invention;

4 is a hardware structural diagram of a capacitor leakage abnormality detection system according to a specific embodiment of the present invention;

5 is a flowchart of a method for detecting an abnormality of a capacitor leakage current applied to an energy storage type tram provided by a specific embodiment of the present invention;

FIG. 6 is an expanded flowchart of a method for detecting an abnormality of a capacitor leakage current applied to an energy storage tram according to a specific embodiment of the present invention.

detailed description

In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a flowchart of a method for detecting an abnormality of capacitor leakage provided by a specific embodiment of the present invention.

In a specific implementation manner of the present invention, an embodiment of the present invention provides a method for detecting an abnormal capacitance leakage, including:

S11: Obtain the voltage value V1 of the capacitor at the first time T1, and isolate and place the voltage value V2 at the second time T2 after the first time T1;

In this embodiment, first measure a voltage value V1 of a capacitor having a charge, that is, a voltage, at a time T1, and isolate the capacitor for a period of time to T2, and measure the voltage value V2 at this time, so that The voltage difference of the capacitor in this time period can be obtained from further calculations. It is impossible for a capacitor medium to be absolutely non-conductive. When a DC voltage is applied to a capacitor, a leakage current will be generated in the capacitor. If the leakage current is too large, it can be determined that the capacitor has an abnormal leakage.

S12: Calculate the average leakage current I of the capacitor in the time period from T1 to T2 by using the pre-stored parameters of the T1, the T2, the V1, the V2, and the capacitor;

In the previous step, the voltage value V1 of the capacitor at the first time T1 is obtained, and the voltage value V2 of the capacitor is placed in isolation after the first time T1 to the second time T2, so that this segment of the capacitor can be further calculated. The average leakage current I in time can be calculated by the formula I = ΔU * C / ΔT = (V1-V2) * C / (T2-T1), where C is the capacitance value of the capacitor, that is, the pre-storage of the capacitor parameter.

S13: Determine whether the average leakage current I exceeds a preset threshold; if yes, determine that the capacitor leakage is abnormal.

After calculating the average leakage current I of the capacitor, it can be compared with a preset threshold value. Generally, the larger the average leakage current, the greater the probability of leakage abnormality of the capacitor. For the setting of the preset threshold value, you can Determining a large number of such capacitors that are normally shipped, such as one hundred such capacitors, you can determine that these capacitors are in the same situation, for example, charge these capacitors to the V1 voltage value, and then place them at the same time interval ΔT, and then measure them After the voltage value V3, the normal average leakage current of the capacitor can be calculated. The average leakage current can be set as a preset threshold. Of course, a range can be set. For example, the average leakage current can be set. Within a certain percentage of the upper and lower limits are preset thresholds, for example, you can set the upper and lower floating ten percent.

An embodiment of the present invention provides a method for detecting an abnormal leakage current of a capacitor. By calculating a voltage change of a capacitor after being placed in isolation for a period of time, by calculating an average leakage current of the capacitor during the period, and determining whether the average leakage current is normal, Therefore, the abnormal state of the capacitor is judged to more easily detect the abnormal leakage of the capacitor, which is simple, reliable and practical, and can be applied to the determination of any abnormal leakage of the capacitor.

Please refer to FIG. 2, which is a flowchart of a method for detecting an abnormality of a capacitor leakage current according to another embodiment of the present invention.

In a specific implementation manner of the present invention, an embodiment of the present invention provides a method for detecting an abnormality of a capacitor leakage. The method is applied to the leakage detection of a supercapacitor of a railcar energy storage power source, including:

S21: Obtain the voltage value V1 of the first supercapacitor of the railcar energy storage power supply when the first time T1 is deactivated, and isolate and place the voltage value V2 when the second time T2 is activated after the first time T1;

S22: Use the pre-stored parameters of the T1, the T2, the V1, the V2, and the first supercapacitor of the railcar energy storage power source to calculate the first supercapacitor of the railcar energy storage power source A first average leakage current I during the time period from T1 to T2;

S23: Determine whether the first average leakage current I exceeds a preset threshold; if yes, determine that the first ultracapacitor is leaking abnormally.

In this specific embodiment, the measurement principle is basically the same as that of the previous specific embodiment, and the leakage detection of the supercapacitor of the energy storage power supply of the tram is further applied according to the operating rules of the rail train. Specifically, in conjunction with the operation of the energy-storage tram, the supercapacitor voltage is detected when the energy-storage tram operation is completed and the deactivation is returned to the depot, and when the vehicle is deactivated the next day, the supercapacitor voltage is detected. Voltage difference and time interval to determine the magnitude of capacitor leakage.

Specifically, when the preset threshold of the method is set, it can also be set according to the structure and structure of the supercapacitor of the energy storage power supply of the rail train. For example, a specific energy storage power supply of a tram is provided. Say: 2 super capacitors are connected in parallel to form a module, 8 modules are connected in series to form a module, 43 modules are connected in series to form the main circuit of the energy storage power supply, and a CMS management system is used to form an energy storage power supply. Therefore, the energy storage power supply consists of 344 modules (two capacitors in parallel form a module, which can be regarded as a large super capacitor), and the parameters of these modules are the same.

Therefore, when the preset threshold is specifically set, the average leakage current of all supercapacitors of the streetcar energy storage power source under the same conditions as the first average leakage current I can be calculated first; The average leakage current of the capacitor is averaged again to obtain a preset threshold. Because, as a whole, it is unlikely that a large proportion of modules will have leakage current at the same time, and the operating time and working conditions of these modules are basically the same, so the aging situation is basically the same. In this case, even one of them The module has an abnormal leakage current, and it is unlikely to affect such a large amount of average leakage current to the extent of the abnormality, so a preset threshold can be obtained by this method. Of course, the preset threshold value obtained by this calculation method may also be floated up and down in a certain proportion, for example, ten percent.

Further, another method may be used to obtain the preset threshold, for example, the average leakage current of the supercapacitor that was not determined to be an abnormal leakage current last time may be recorded as the next preset threshold. That is, the first historical leakage current is set as a preset threshold; wherein the first historical leakage current is a first average leakage current that has not been determined as an abnormal leakage current in the history of the first super capacitor.

It is worth noting that, on the basis of the above specific implementation, in this specific implementation, in order to measure the voltage value V1 of the first supercapacitor of the streetcar energy storage power source at the first time T1 when it is deactivated, you can first obtain The real-time voltage value of the weak power supply; judging whether the real-time voltage value is less than a preset voltage value; if it is, then it is recorded as the first time T1 at this time, and accordingly, the voltage value of the first super capacitor at this time is V1 Wherein, the weak electric power supply has a capacitor in parallel. That is to say, in the embodiment of the present invention, a capacitor is added to the power supply of the main control board. For example, it can be a point decoupling capacitor. When the vehicle is deactivated, due to the presence of electrolytic capacitors, its power supply has a certain slope. Up and down, at the same time, add a power failure detection chip to the main control board. When the power supply voltage drops to a set value, data is stored.

The capacitor leakage abnormality detection method is applied to the leakage detection of the supercapacitors of the energy storage power supply of the tram, which can better adapt to the operating rules of the tram. When the supercapacitors of the energy storage power supply of the tram is deactivated, the voltage can be measured. When the supercapacitor of the tram's energy storage power supply is activated, the voltage is measured again, so that the average leakage current of the supercapacitor during this time can be calculated, and whether the supercapacitor is normal or not.

Please refer to FIG. 3, which is a schematic diagram of a capacitor leakage abnormality detection system according to another embodiment of the present invention.

In still another specific embodiment of the present invention, the present invention provides a capacitor leakage abnormality detection system 300, which is applied to the leakage detection of a supercapacitor of a tram vehicle energy storage power supply, including:

The voltage moment obtaining module 301 is used to obtain the voltage value V1 of the first supercapacitor of the streetcar energy storage power supply when the first moment T1 is deactivated, and is isolated and placed after the first moment T1 until the second moment T2 is activated Voltage value V2;

The leakage current calculation module 302 is configured to use the pre-stored parameters of the T1, the T2, the V1, the V2, and the first supercapacitor of the streetcar energy storage power source to calculate the streetcar energy storage. A first average leakage current I of a first super capacitor of the power supply during the time period from T1 to T2;

The abnormality determining module 303 is configured to determine whether the first average leakage current I exceeds a preset threshold; if it is, determine that the first supercapacitor is leaking abnormally.

Preferably, the capacitive leakage abnormality detection system further includes:

Preferably,

The voltage time obtaining module includes:

Please refer to FIG. 4, FIG. 5, and FIG. 6. FIG. 4 is a hardware structural diagram of a capacitor leakage detection system according to a specific embodiment of the present invention. FIG. 5 is an application provided by a specific embodiment of the present invention. FIG. 6 is a flowchart of a method for detecting an abnormality of capacitor leakage in an energy-storage tram according to a specific embodiment of the present invention.

Specifically, the present invention takes the energy storage power supply of a tram as an example: 2 super capacitors are connected in parallel to form a module, 8 modules are connected in series to form a module, and 43 modules are connected in series to form the main circuit of the energy storage power supply. The CMS management system and other components constitute the energy storage power supply. The entire energy storage power supply consists of 344 modules. The capacity, internal resistance and leakage of each module are important parameters for module consistency.

In order to be suitable for high-power charging and discharging, each module has a voltage equalization unit, which is responsible for module voltage acquisition, fault determination and identification, module voltage equalization, and data communication. CAN communication is used between the voltage equalization units through the CAN bus. Send the module voltage value, fault information, module temperature information, etc. to the main control board, and then the main control board sends the corresponding display to the vehicle display screen through CAN (or MVB), as shown in Figure 4. When the vehicle is running normally, the voltage equalization unit will send the module's voltage value to the main control board every cycle. Due to the huge amount of data, the main control board will only save a certain amount of data in real time and dynamically. After power failure, the data It will also be lost. Therefore, at the moment of power failure, the data stored in the main memory (memory) must be stored in the auxiliary memory (external storage, not lost when power is off). In order to achieve this function, the invention patent is on the main control board. An electrolytic capacitor is added to the power supply. When the vehicle is deactivated, due to the presence of the electrolytic capacitor, its power supply rises and falls at a certain slope. At the same time, a power-down detection chip is added to the main control board. When the power supply voltage drops to the setting, The value is stored in the data.

When the energy storage tram operation returns to the warehouse at T1 for routine maintenance and deactivation, the system reads the voltage V1 of each module of the energy storage power supply and saves it. When the warehouse operation is activated at T2, the system reads the energy storage again. The voltage V2 of each module of the power supply is saved.

The leakage voltage of each module during T2-T1 time is: V1-V2.

According to ΔU = I * ΔT / C, the average leakage current can be calculated.

I = ΔU * C / ΔT = (V1-V2) * C / (T2-T1)

The capacity of the module also affects the voltage change value. The larger the capacity, the smaller the voltage change value in the same time. However, the difference in capacity between modules will cause the energy storage power supply to operate under cyclic charging and discharging conditions. Overvoltage or undervoltage phenomenon also affects the reliable operation of the energy storage power supply.

In the application of the project, the purpose of detecting leakage current is mainly to determine the module of abnormal leakage. The judgment method is mainly a combination of historical data and relative data. Therefore, the capacity of all modules is regarded as the same reference value C = 1, and the relative leakage current is used as the basis for judging the abnormality of the module.

That is, I = (V1-V2) / (T2-T1) = kΔU, k = 1 / (T2-T1)

Suppose the detection data I _MX0 = k ₁ ΔU _x0 , the relative leakage current value of the x-th module,

Therefore, each relative leakage current value can be calculated, and these relative leakage current values can be further averaged.

The historical relative leakage current value I _MX1 = k ₁ ΔU _x1 , the detection leakage current value of the Xth module with the normal leakage current last time;

The detection data is compared with historical data. When the detection data is n times the historical data, it is determined that the module has an abnormal leakage. The detection data is compared with the average data. When the detection data is m times the average value, the module's leakage is considered abnormal.

That is, if I _MX0 / I _MX1 > n or I _MX0 / I _MAVG > m, (n> 1, m> 1), it is judged that the leakage of the xth module is abnormal, and the system issues a warning to inform the vehicle that the module x needs to be replaced.

Before the embodiment of the present invention, only when the module was severely over- and under-voltage, and then returned to the factory for testing, the leakage leakage abnormality was known. After the technical solution of the embodiment of the patent is adopted, the failure can be determined and identified in advance to prevent the failure Further expansion. At the same time, leakage data can be collected every day, and big data analysis can be collected, which has a very good supporting role in analyzing the cause of abnormal leakage.

In another specific implementation manner of the present invention, an embodiment of the present invention provides a monitoring computer device, including:

Memory for storing computer programs;

A processor is configured to implement the steps of the method for detecting a capacitor leakage abnormality provided in any one of the foregoing specific implementations when the computer program is executed.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the devices, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and are not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed devices, devices, and methods may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. To another device, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially a part that contributes to the existing technology or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium , Including a number of instructions to enable a computer device (which may be a personal computer, a function calling device, or a network device, etc.) to perform all or part of the steps of the method of each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, and a read-only memory

(Read-Only Memory (ROM)), Random Access Memory (RAM), magnetic disks or compact discs, and other media that can store program codes.

Finally, it should be noted that in this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities. There is any such actual relationship or order between OR operations. Moreover, the terms "including", "comprising", or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or device that includes a series of elements includes not only those elements but also those that are not explicitly listed Or other elements inherent to such a process, method, article, or device. Without more restrictions, the elements defined by the sentence "including a ..." do not exclude the existence of other identical elements in the process, method, article, or equipment that includes the elements.

The method and system for detecting the leakage current of a capacitor provided by the present invention, and the computer equipment have been described in detail. The principle and implementation of the present invention have been described with specific examples. The descriptions of the above embodiments are only for help. Understand the method of the present invention and its core ideas; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood as limit.

Claims

A method for detecting abnormal leakage current of a capacitor, comprising:

Obtain the voltage value V1 of the capacitor at the first time T1, and isolate and place the voltage value V2 at the second time T2 after the first time T1;

Using the pre-stored parameters of the T1, the T2, the V1, the V2, and the capacitor to calculate an average leakage current I of the capacitor in the time period from T1 to T2;

It is determined whether the average leakage current I exceeds a preset threshold; if yes, it is determined that the capacitor leakage is abnormal.
A method for detecting an abnormal leakage current of a capacitor, which is characterized in that the method is applied to the leakage detection of a supercapacitor of a tramcar energy storage power supply, including:

Obtaining the voltage value V1 of the first supercapacitor of the railcar energy storage power supply when the first time T1 is deactivated, and isolating and placing the voltage value V2 when the second time T2 is activated after the first time T1;

Use the pre-stored parameters of the T1, the T2, the V1, the V2, and the first supercapacitor of the tram vehicle energy storage power supply to calculate the first supercapacitor of the tram vehicle energy storage power supply at all locations. The first average leakage current I in the period from T1 to T2;

It is determined whether the first average leakage current I exceeds a preset threshold; if yes, it is determined that the leakage of the first super capacitor is abnormal.
The method for detecting an abnormality of a capacitor leakage according to claim 2, wherein:

Before the determining whether the first average leakage current I exceeds a preset threshold; and if yes, determining that the first supercapacitor has an abnormal leakage, the method further includes:

Calculating an average leakage current of all supercapacitors of the tramcar energy storage power source under the same conditions as the first average leakage current I;

The average leakage current of all supercapacitors is averaged again to obtain a preset threshold.
The method for detecting an abnormality of a capacitor leakage according to claim 2, wherein:

Before the determining whether the first average leakage current I exceeds a preset threshold; and if yes, determining that the first supercapacitor has an abnormal leakage, the method further includes:

Setting the first historical leakage current to a preset threshold;

The first historical leakage current is a first average leakage current in the history of the first supercapacitor that has not been determined to be an abnormal leakage current.
The method for detecting a capacitor leakage abnormality according to any one of claims 2 to 4, characterized in that:

The obtaining the voltage value V1 of the first supercapacitor of the energy storage power supply of the tram when the T1 is deactivated at the first moment includes:

Get the real-time voltage value of the weak power supply;

Determining whether the real-time voltage value is less than a preset voltage value;

If it is, then it is recorded that it is the first time T1 at this time, and accordingly, the voltage value of the first super capacitor at this time is V1;

Wherein, a capacitor is connected in parallel with the weak electric power supply.
A capacitor leakage abnormality detection system, which is characterized in that the system is applied to the leakage detection of a supercapacitor for the energy storage power supply of a tram, including:

The voltage moment acquisition module is used to obtain the voltage value V1 of the first supercapacitor of the streetcar energy storage power supply when the first moment T1 is deactivated, and is isolated and placed after the first moment T1 until the second moment T2 is activated Voltage value V2;

The leakage current calculation module is configured to use the T1, the T2, the V1, the V2, and a pre-stored parameter of the first supercapacitor of the railcar energy storage power source to calculate the railcar energy storage power source A first average leakage current I of the first supercapacitor in the time period from T1 to T2;

An abnormality determining module is configured to determine whether the first average leakage current I exceeds a preset threshold; if yes, determine that the first ultracapacitor is leaking abnormally.
The capacitive leakage abnormality detection system according to claim 6, further comprising:

A first leakage current calculation module, configured to calculate an average leakage current of all supercapacitors of the streetcar energy storage power source under the same conditions as the first average leakage current I;

The first threshold obtaining module is configured to obtain an average of the average leakage currents of all supercapacitors again to obtain a preset threshold.
The capacitive leakage abnormality detection system according to claim 6, further comprising:

A second threshold obtaining module, configured to set the first historical leakage current to a preset threshold;

The first historical leakage current is a first average leakage current that has not been determined to be an abnormal leakage current in the history of the first ultracapacitor.
The capacitive leakage abnormality detection system according to claim 6, wherein:

The voltage time obtaining module includes:

Weak voltage acquisition unit, used to obtain the real-time voltage value of the weak power supply;

A voltage value judgment module, configured to determine whether the real-time voltage value is less than a preset voltage value;

The voltage value time recording unit is configured to record a first time T1 at this time if it is determined that the real-time voltage value is less than a preset voltage value, and accordingly, the voltage value of the first super capacitor at this time is V1;

Wherein, a capacitor is connected in parallel with the weak electric power supply.
A testing computer device, comprising:

Memory for storing computer programs;

A processor, configured to implement the steps of the method for detecting a capacitor leakage abnormality according to any one of claims 1 to 5 when executing the computer program.