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A wavelet-based transient detector for P and M class phasor measurement unit integration

In this paper a wavelet-based transient detector is proposed for P and M class phasor measurement unit (PMU) integration. The input waveform in the sampling window is analyzed looking for the local maxima in wavelet coefficients in three different levels to detect a transient previous to the computation of the phasor. If no transients are detected in the wavelet coefficients, the signal is considered stationary, otherwise the signal is considered in dynamic state, so allowing the estimation of the phasor using the most appropriate measurement algorithm for the actual operation conditions. This paper presents some of the preliminary results obtained in the detection of step changes in magnitude and in phase angle and oscillatory and high-frequency transients, also studying the effect of noise and harmonic distortion on the performance of the detection method.