直流故障電弧的特征提取與識別
[Abstract]:Because DC arc has no periodicity and zero crossing, it is more difficult to detect DC fault arc than AC fault arc. The feature extraction of DC fault arc is lack of diversification at home and abroad, so the purpose of this paper is to enrich the characteristics of DC fault arc, and give the evaluation criteria from two aspects: feature extraction and recognition. The arc studied in this paper belongs to hot cathode, gas, series, DC, fault arc. The current data of normal operation and fault arc are collected by experimental method. The unstable phase of arc is selected as the data base of feature extraction. A total of 17 features were extracted from time domain, frequency domain, wavelet, spectral analysis and chaos analysis. In time-frequency analysis, four features in time domain, three features in frequency domain and three features in wavelet domain are extracted from current variation, statistics and wavelet transform respectively. In spectral analysis, three power spectral features are extracted from amplitude and three higher-order spectral features are extracted from amplitude and phase. In chaos analysis, time delay is calculated based on autocorrelation method, embedded dimension is calculated based on false nearest neighbor method, the phase space of arc current is reconstructed by these two parameters, and one feature of maximum Lyapunov exponent is extracted by the method of small amount of data. The index of feature evaluation in feature extraction level, that is, the percentage of value, is given, and the index value of each feature is calculated, among which the index value of chaotic feature is the largest. Support vector machine (Support Vector Machines,SVM) is used to identify fault arc features. The nonlinear support vector machine based on Gao Si kernel function is chosen as the final classifier. The parameters of SVM are optimized by grid search method and 3-fold cross validation method. The penalty parameter is 0.054409 and the kernel parameter is 1. One general classifier was trained, the accuracy rate was 99.999, and 17 comparative classifiers were all reduced, but the overall accuracy remained above 99.9%. The evaluation criterion of recognition level is given, that is, the degree of contribution to accuracy, and the index value of each feature is calculated, among which the index value of chaotic feature is the largest. The results show that the feature extraction method and pattern recognition strategy used in this paper are correct, the two indexes can be used to evaluate the features, and the problem of DC fault arc detection is essentially a chaotic identification problem. The research in this paper enriches the characteristic types of DC fault arc, and gives the evaluation criteria for feature validity.
【學位授予單位】:浙江大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM501.2
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