Online intelligent fault diagnosis method of power electronic circuit based on FRFT and IFSVC
A technology for power electronics and fault diagnosis, applied in the direction of electronic circuit testing, etc., can solve the problems of increasing the training and identification burden of machine learning methods, low fault resolution, and increasing the dimension of fault samples, so as to improve the degree of automation and real-time diagnosis. effect of effect
Inactive Publication Date: 2009-12-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Among them, the system modeling method is a relatively good method, but the calculation of the required parameter estimation is very large, and it is still difficult to use it for online diagnosis; and the intelligent pattern recognition method based on signal processing is the current research hotspot
In the actual diagnosis of power electronic circuits, the commonly used signal processing method is mainly fast Fourier analysis (FFT). The theory of FFT method is relatively mature, and it has been widely used in digital signal processors for harmonic analysis. There are abundant engineering application materials available, but FFT only converts the signal from the time domain to the frequency domain for analysis, and a lot of useful information is lost during the transition calculation, so the fault resolution obtained during feature extraction is not sufficient. high
[0004] Using the fractional-order Fourier analysis method can solve the problem of low fault resolution, but the dimension of fault samples may increase accordingly, which increases the training and recognition burden of subsequent machine learning methods
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[0022] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:
[0023] The present invention adopts the block diagram of the online intelligent fault diagnosis process of the power electronic circuit based on IFSVC, such as figure 1 shown. The implementation of the present invention is mainly divided into two steps: off-line simulation and on-line diagnosis. The main purpose of offline simulation is to establish a fault dictionary, and online diagnosis is mainly to use the fault dictionary to calculate and locate faults. The specific operation is as follows:
[0024] 1) Before the online diagnosis of the power electronic circuit, the testability analysis of the power electronic circuit to be tested is carried out offline first, and then the test nodes and test parameters of the power circuit are determined according to the type and number of fault modes to be diagnosed.
[0025] The testability analysis of power electronic ...
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The invention relates to an online intelligent fault diagnosis method of a power electronic circuit based on FRFT and IFSVC, which belongs to the field of signal processing and power electronic fault test. The method comprises the following steps: acquiring outputting signals of a to-be-tested power electronic circuit periodically at the proper testable node of a circuit; converting the acquired voltage or current signals in the way of FRFT to extract fault characteristics so as to form samples; and using a fault dictionary to work out so as to locate fault elements. The invention has the advantages of simple method, higher fault distinguishability, diagnosis accuracy, and the like; in addition, the invention can also improve the automation degree of the online fault diagnosis of the power electronic circuit.
Description
technical field [0001] The invention relates to an online intelligent fault diagnosis method for power electronic circuits based on FRFT and IFSVC (Importance First SVC), which belongs to the field of signal processing and power electronic fault testing. Background technique [0002] Power electronic circuit systems are widely used in various industrial and military equipment, and circuit systems (or subsystems) are often composed of a variety of power components, and these components often have a certain life cycle; in addition, circuit components suffer from frequent startup In addition to / stop operation and overvoltage and overcurrent operation, its performance is often easily affected by environmental stresses such as temperature, mechanical vibration, electromagnetic interference, humidity, etc., which may lead to early deterioration or even failure of device performance, which will cause the entire circuit The overall performance of the system is weakened, and the pr...
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Inventor 崔江王友仁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS