Research on VFTO Identification of GIS Based on Wavelet Transform and Singular Value Decomposition

The accurate identification of Very Fast Transient Overvoltage (VFTO) is the key overvoltage control in modern smart grids. In order to accurately identify VFTO generated by operation a disconnector Gas Insulated Substation (GIS), method based on Wavelet Transform (WT) and Singular Value Decomposition (SVD) proposed. simulation model established ATP-EMTP software first, then wavelet decomposition used MATLAB for waveform from software. Then, feature matrix composed coefficients each frequency layer wavelet. SVD decompose matrix, finally characteristic parameters are obtained. results Matlab indicate that have an obvious difference compared with those power AC voltage, especially load-side, which verifies effectiveness WT proposed this paper.