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A Novel Power Swing Blocking Scheme Using Orthonormal Wavelet Analysis

A new scheme for fault identification during power swings is proposed in this paper. The new scheme is based on the orthonormal wavelet transform algorithm. The main advantage of the proposed scheme is that different types kinds of fault of the transmission line can be correctly identified from different types of the fast power swings. Also, the faults during power swings can be identified from the power swings with the proposed scheme without any time delay. Furthermore, the problem whether the protection should trip or not immediately for the distance protection is discussed in the paper. Test results with the data sampled from EMTP verify the effectiveness of the proposed scheme. Furthermore, another advantage of this algorithm is that it can be realized for the real-time applications with finite real calculation.