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The access of distributed generator (DG) is inevitable in the construction of smart distribution network, but it will cause original fault-diagnosis methods failure. In this paper, based on deeply analysis of diagnosis information structure in distribution network with DGs, study fruits within the domain at home and abroad are surveyed. Firstly, from the aspects of accuracy and rapidity, the main...
Support vector machine (SVM) classifier has been successfully applied to power transformer fault diagnosis. However, there is no theoretical basis or effective method to select appropriate SVM classifier parameters which have a crucial influence on the classification accuracy. Currently, the main method is cut and try based on experience. In this study, genetic algorithm (GA) is employed to optimize...
A kind of gene expression programming algorithm (GEP) based on factor analysis (FA) is proposed and used for transformer fault diagnosis in this paper. The application of factor analysis can reduce the dimension and the correlation of the feature vectors, so as to decrease the computational complexity of the diagnosis classifier and increase the training and test accuracy. 170 groups of the transformer...
This paper proposed a hierarchical model for smart substation fault diagnosis. This fault diagnosis system gets fault information from SCADA and fault information system. The information from SCADA, including network topology and switch state, is modeled based on IEC61970-CIM. The protection information from the fault information system is modelled based on IEC61850, then encapsulated CIM model. When...
Owing to its advantages such as high reliability for power supply, flexible operating and dispatching mechanism and convenient transfer breaker, the 3/2 mode of connection has been greatly put into use in 500kv power stations and some 200kv load-center substations. However, more equipment may be subjected to power cut caused by some fault modes as long as the mode of connection is linked with primary...
The accurate identification of lightning fault has very important significance to the lightning protection of the lines. A new identification method of is proposed in this paper. HHT transform is used to identify lightning faultsand short circuit faults. Compared with wavelet transform method, it has no selection problem of transformation parameter, and the transform result has its uniqueness. The...
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