CN112444711A - IGBT parallel system health assessment method based on electromagnetic radiation - Google Patents
IGBT parallel system health assessment method based on electromagnetic radiation Download PDFInfo
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- CN112444711A CN112444711A CN202011461985.XA CN202011461985A CN112444711A CN 112444711 A CN112444711 A CN 112444711A CN 202011461985 A CN202011461985 A CN 202011461985A CN 112444711 A CN112444711 A CN 112444711A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2642—Testing semiconductor operation lifetime or reliability, e.g. by accelerated life tests
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/265—Contactless testing
- G01R31/2656—Contactless testing using non-ionising electromagnetic radiation, e.g. optical radiation
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Abstract
The invention discloses an IGBT parallel system health assessment method based on electromagnetic radiation, which comprises the following steps: s1, acquiring electromagnetic radiation signals of the plurality of parallel converters through the sensor; s2, positioning the abnormal converter; s3, separating the electromagnetic radiation signals of the abnormal converter through fast Fourier transform and filtering; s4, performing health assessment on the abnormal converter through electromagnetic radiation signal comparison; and S5, fault diagnosis. According to the invention, the relation between the electromagnetic radiation signal of the converter and the IGBT degradation is established, the degradation of the IGBT is represented by the reduction of the electromagnetic radiation signal, the degradation degree of the converter is determined by comparing the electromagnetic radiation signal of a normal converter with the electromagnetic radiation signal of an abnormal converter, and the health assessment problem of the IGBT parallel system based on the multi-converter is solved. The method can be conveniently applied to an IGBT parallel system with a plurality of converters working cooperatively, and does not have any physical contact with the converters.
Description
Technical Field
The invention relates to the field of semiconductors, in particular to an IGBT parallel system health assessment method based on electromagnetic radiation.
Background
Insulated Gate Bipolar Transistors (IGBTs) have the characteristics of high current, high rated voltage, strong short-circuit resistance and the like, and are the most commonly used power electronic devices in power converters. It has been investigated that about 38% to 40% of power converter failures are due to power electronics failures. The gradual degradation of the IGBT performance not only affects the performance of the converter, but also affects downstream devices. The state monitoring can timely find the degradation and the fault, compare the operation characteristics of the system with standard characteristics, and find out the obvious change of the index representing the degradation or the fault of the system, so that the whole system is prevented from being seriously deteriorated or suddenly crashed.
As power converters operate at high frequency and high power conditions, power electronics experience extreme power cycling, environmental stress, and overload conditions, causing them to degrade rapidly. Through the measurement of the aging characteristic parameters, the aging phenomenon of the power electronic device can be found in time. These characteristic parameters include leakage current, threshold voltage, on-off voltage, off time, junction temperature, etc.
The existing methods are mostly based on the measurement of various internal parameters of the transducer, the implementation of which requires complex circuitry, high cost sensors and high speed processors. In addition, these methods are limited to monitoring a single converter, which cannot be used for multi-converter IGBT parallel systems. Electromagnetic radiation-based monitoring methods overcome these limitations and provide a non-invasive method of health assessment.
Disclosure of Invention
The invention provides an IGBT parallel system health assessment method based on electromagnetic radiation, which assesses the health condition of an IGBT by detecting an electromagnetic radiation signal generated by a converter. In the IGBT parallel system of the multi-converter, electromagnetic radiation signals generated by the converters are mixed together, and the invention can detect and separate the electromagnetic radiation signals generated by the abnormal converter, thereby carrying out health evaluation on the abnormal converter. The invention adopts the rotation invariance technology to estimate the signal parameters, combines the multi-signal classification algorithm, and has higher resolution and lower computational complexity compared with the prior art.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
the health assessment method of the IGBT parallel system based on electromagnetic radiation comprises the following steps:
s1, acquiring electromagnetic radiation signals of the plurality of parallel converters through the sensor;
s2, positioning the abnormal converter;
s3, separating the electromagnetic radiation signals of the abnormal converter through fast Fourier transform and filtering;
s4, performing health assessment on the abnormal converter through electromagnetic radiation signal comparison;
and S5, fault diagnosis.
Further, the specific method of step S2 includes the following sub-steps:
s2-1, adopting the uniform line array of the loop antenna to capture the electromagnetic radiation signal generated by the transducer, positioning M transducers, using 2N +1 sensors, and satisfying the following formula:
2N+1≥2M+1
s2-2, calculating the time delay of the electromagnetic radiation signal received by the sensor relative to the first sensor;
s2-3, according to the time delay obtained in the step S2-2, calculating the value of the electromagnetic radiation signal received by the sensor at the set moment, and for a plurality of sample data, equivalently forming the value of the obtained electromagnetic radiation signal into a matrix representation form;
s2-4, determining the arrival direction of the electromagnetic radiation signal by using a subspace-based algorithm for estimating signal parameters through a rotation invariance technology;
and S2-5, finding the distance between the first sensor and the abnormal transducer by using a multi-signal classification algorithm, and determining the position of the abnormal transducer.
Further, the specific method of step S4 includes the following sub-steps:
s4-1, continuously comparing electromagnetic radiation signals of two threshold frequency bands, wherein the first frequency band is composed of electromagnetic radiation signals of an IGBT converter in a normal working state, the maximum value in the frequency band is recorded as FB1, the second frequency band is composed of electromagnetic radiation signals of a fault converter, the maximum value in the frequency band is recorded as FB2, and the absolute value of the difference between FB1 and FB2 is calculated to obtain a threshold band;
s4-2, finding out the spectrum peak value of the electromagnetic radiation signal of the abnormal converter separated in the step S3, recording the spectrum peak value as M, calculating the absolute value of the difference between FB1 and M to obtain the degradation level of the abnormal converter, dividing the degradation level by the threshold band, and multiplying the threshold band by 100 to obtain the degradation level percentage of the abnormal converter.
Further, the specific method of step S5 is:
and (4) judging whether the degradation level percentage of the abnormal converter acquired in the step (S4-2) is greater than or equal to 95%, if so, indicating that the converter has a fault, and recommending maintenance or replacement of equipment, otherwise, returning to the step (S1).
The invention has the beneficial effects that: the invention provides a health evaluation method of an IGBT parallel system based on electromagnetic radiation, aiming at solving the health evaluation problem of the IGBT parallel system based on a multi-converter. Accelerated aging experiments of IGBTs show that as the number of power cycles increases, the performance of the device degrades. The invention establishes the relation between the electromagnetic radiation signal of the converter and the IGBT degradation, and determines the degradation degree of the converter by comparing the electromagnetic radiation signals of normal and abnormal converters. The method can be conveniently applied to an IGBT parallel system with a plurality of converters working cooperatively, and does not have any physical contact with the converters.
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FIG. 1 is a schematic flow diagram of the process.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, the method for evaluating the health of the IGBT parallel system based on electromagnetic radiation includes the following steps:
s1, acquiring electromagnetic radiation signals of the plurality of parallel converters through the sensor;
s2, positioning the abnormal converter;
s3, separating the electromagnetic radiation signals of the abnormal converter through fast Fourier transform and filtering;
s4, performing health assessment on the abnormal converter through electromagnetic radiation signal comparison;
and S5, fault diagnosis.
The specific method of step S2 includes the following substeps:
s2-1, adopting the uniform line array of the loop antenna to capture the electromagnetic radiation signal generated by the transducer, positioning M transducers, using 2N +1 sensors, and satisfying the following formula:
2N+1≥2M+1
s2-2, calculating the time delay of the electromagnetic radiation signal received by the sensor relative to the first sensor;
s2-3, according to the time delay obtained in the step S2-2, calculating the value of the electromagnetic radiation signal received by the sensor at the set moment, and for a plurality of sample data, equivalently forming the value of the obtained electromagnetic radiation signal into a matrix representation form;
s2-4, determining the arrival direction of the electromagnetic radiation signal by using a subspace-based algorithm for estimating signal parameters through a rotation invariance technology;
and S2-5, finding the distance between the first sensor and the abnormal transducer by using a multi-signal classification algorithm, and determining the position of the abnormal transducer.
The specific method of step S4 includes the following substeps:
s4-1, continuously comparing electromagnetic radiation signals of two threshold frequency bands, wherein the first frequency band is composed of electromagnetic radiation signals of an IGBT converter in a normal working state, the maximum value in the frequency band is recorded as FB1, the second frequency band is composed of electromagnetic radiation signals of a fault converter, the maximum value in the frequency band is recorded as FB2, and the absolute value of the difference between FB1 and FB2 is calculated to obtain a threshold band;
s4-2, finding out the spectrum peak value of the electromagnetic radiation signal of the abnormal converter separated in the step S3, recording the spectrum peak value as M, calculating the absolute value of the difference between FB1 and M to obtain the degradation level of the abnormal converter, dividing the degradation level by the threshold band, and multiplying the threshold band by 100 to obtain the degradation level percentage of the abnormal converter.
The specific method of step S5 is:
and (4) judging whether the degradation level percentage of the abnormal converter acquired in the step (S4-2) is greater than or equal to 95%, if so, indicating that the converter has a fault, and recommending maintenance or replacement of equipment, otherwise, returning to the step (S1).
In the specific implementation process, the IGBT parallel system of the multi-converter in the power electronic system is subjected to fault diagnosis, a sensor is used for measuring an electromagnetic radiation signal generated by the converter, the electromagnetic radiation of a normal converter is-80 dB/Hz, the electromagnetic radiation of an abnormal converter is-97 dB/Hz, the degradation percentage is 42.5 percent and is less than 95 percent, and the condition that no obvious fault occurs is judged without replacement.
In conclusion, the health assessment method and the health assessment device solve the health assessment problem of the IGBT parallel system based on the multi-converter. Accelerated aging experiments of IGBTs show that as the number of power cycles increases, the performance of the device degrades. The invention establishes the relation between the electromagnetic radiation signal of the converter and the IGBT degradation, and finds that the reduction of the electromagnetic radiation signal represents the IGBT degradation. The degree of degradation of the transducer is determined by comparing the electromagnetic radiation signals of the normal and abnormal transducers. The method can be conveniently applied to an IGBT parallel system with a plurality of converters working cooperatively, and does not have any physical contact with the converters.
Claims (4)
1. The IGBT parallel system health assessment method based on electromagnetic radiation is characterized by comprising the following steps:
s1, acquiring electromagnetic radiation signals of the plurality of parallel converters through the sensor;
s2, positioning the abnormal converter;
s3, separating the electromagnetic radiation signals of the abnormal converter through fast Fourier transform and filtering;
s4, performing health assessment on the abnormal converter through electromagnetic radiation signal comparison;
and S5, fault diagnosis.
2. The method for health assessment of an IGBT parallel system based on electromagnetic radiation according to claim 1, characterized in that the specific method of step S2 comprises the following sub-steps:
s2-1, adopting the uniform line array of the loop antenna to capture the electromagnetic radiation signal generated by the transducer, positioning M transducers, using 2N +1 sensors, and satisfying the following formula:
2N+1≥2M+1
s2-2, calculating the time delay of the electromagnetic radiation signal received by the sensor relative to the first sensor;
s2-3, according to the time delay obtained in the step S2-2, calculating the value of the electromagnetic radiation signal received by the sensor at the set moment, and for a plurality of sample data, equivalently forming the value of the obtained electromagnetic radiation signal into a matrix representation form;
s2-4, determining the arrival direction of the electromagnetic radiation signal by using a subspace-based algorithm for estimating signal parameters through a rotation invariance technology;
and S2-5, finding the distance between the first sensor and the abnormal transducer by using a multi-signal classification algorithm, and determining the position of the abnormal transducer.
3. The method for health assessment of an IGBT parallel system based on electromagnetic radiation according to claim 1, characterized in that the specific method of step S4 comprises the following sub-steps:
s4-1, continuously comparing electromagnetic radiation signals of two threshold frequency bands, wherein the first frequency band is composed of electromagnetic radiation signals of an IGBT converter in a normal working state, the maximum value in the frequency band is recorded as FB1, the second frequency band is composed of electromagnetic radiation signals of a fault converter, the maximum value in the frequency band is recorded as FB2, and the absolute value of the difference between FB1 and FB2 is calculated to obtain a threshold band;
s4-2, finding out the spectrum peak value of the electromagnetic radiation signal of the abnormal converter separated in the step S3, recording the spectrum peak value as M, calculating the absolute value of the difference between FB1 and M to obtain the degradation level of the abnormal converter, dividing the degradation level by the threshold band, and multiplying the threshold band by 100 to obtain the degradation level percentage of the abnormal converter.
4. The method for evaluating the health of the IGBT parallel system based on the electromagnetic radiation as claimed in claim 1, wherein the specific method of step S5 is as follows:
and (4) judging whether the degradation level percentage of the abnormal converter acquired in the step (S4-2) is greater than or equal to 95%, if so, indicating that the converter has a fault, and recommending maintenance or replacement of equipment, otherwise, returning to the step (S1).
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| CN113884851A (en) * | 2021-10-26 | 2022-01-04 | 电子科技大学 | IGBT health monitoring method based on Kelvin emitter voltage change |
| CN116298651A (en) * | 2023-05-17 | 2023-06-23 | 广东电网有限责任公司阳江供电局 | Fault monitoring method, system, equipment and medium for converter valve power module |
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