A new real-time algorithm of wavelet transform for detection of sudden-changing signals of power systems

With a complex wavelet function, a new real-time recursive algorithm of wav elet transform (WT) is analyzed in detail. Compared with the existing recur sive algorithm in two directions, the computing time is greatly reduced in response to faults signals in power systems, and the same recursive algorit hm can be generalized to other wavelet functions. With the phases and magni tudes of complex WT coefficients under the fast recursive algorithm, a meth od to detect faults signals of power systems is presented. Lastly, the anal yzing results of some signals show that it is effective and practical for t he complex wavelet and its real-time recursive algorithm to detect faults o f power systems.