期刊名称：International Journal of Signal Processing, Image Processing and Pattern Recognition
印刷版ISSN：2005-4254
出版年度：2015
卷号：8
期号：10
页码：81-90
DOI：10.14257/ijsip.2015.8.10.09
出版社：SERSC
摘要：The current in frequency domain can not be analyzed at the same time because of the limitations of the Fourier transform algorithm. Hence, the wavelet transform method is used to analyze the short circuit transient current and calculate the negative-sequence component in this paper. Then, the non-periodic component and periodic component fundamental wave of the transient current are obtained, and the high harmonic components and decreased periodic component are removed. The non-periodic component is seriously considered in the transient negative-sequence component calculation. The calculation results indicate that the transient negative-sequence component contains two parts, the equivalent negative-sequence component of non- periodic component and the negative-sequence component of negative-sequence current. The world's first AP1000 third generation 1250 MVA nuclear half-speed (4-pole) turbo- generator is adopted as the calculation model. The transient parameters of the large generator are calculated on the principle of transformed current waveform in the internal short circuit fault condition. Furthermore, the transient negative-sequence component of the large-capacity generator is also calculated and the negative-sequence ability is deeply discussed in this work, which provides a theoretical basis for the large generators' protection and design
关键词：negative-sequence component; transient current analysis; large generator; ; wavelet transform; internal short circuit fault
