Abstract：For multi-rate source, protection receives the digital signals with different sampling rates from communication interface, resulting in the different sampling rates on the two sides of differential protection and errors. This paper concentrates mainly on resampling method for input signal with different sampling rates in multi-rate source, and proposes the frequency domain transformation resampling method. Firstly, performs half-wave Fourier transformation on protection sampling signal. Secondly, processes the frequency domain resulting from the transformation based on the difference in sampling rates. Thirdly, changes the processed frequency spectrum to the time domain with inverse transformation, obtaining resampled signal. Comparing with the current method for resampling, this method can not only utilize the waiting time data of R times of continuous distinguishing of differential protection of sampled values efficiently and increase the precision of resampling, but also limit the error in resampling to a low level when signals contain a wealth of high-order harmonic, as well as archive zero-delay for resampling output. The average error rates of resampling precisions during the system normal and during external fault removal, showed by the simulation, are only 0.50% and 1.10% separately, both are better than traditional method of time domain resampling.
王业, 陆于平, 徐以超, 许偲轩. 一种用于差动保护的新型重采样方法[J]. 电工技术学报, 2012, 27(11): 239-249.
Wang Ye, Lu Yuping, Xu Yichao, Xu Sixuan. A Novel Resampling Method for Differential Protection. Transactions of China Electrotechnical Society, 2012, 27(11): 239-249.
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