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Abstract
Combined digital filters are the basis of fault selection and identification in electric microprocessor protection. The commonly used combined digital filters based on wavelet transform cannot eliminate the interference components of traditional filter, resulting in low reliability of electric microcomputer protection. To this end, a design method of combined digital filter for electric microcomputer protection is proposed based on distributed algorithm. First, the combined digital filter and each implementation module are designed. Then, the principle of distributed algorithm is introduced, and realization of distributed algorithm is analysed, so as to realize the design of combined digital filter. The experimental results show that calculation of the filter designed by this method is simple and effective, and the development of electric microprocessor protection is promoted.