A virtual measurement instrument for electrical power quality analysis using wavelets

This paper presents a virtual measurement instrument for detection and analysis of power quality disturbances in voltage supply using wavelets. The instrument developed can operate in different working modes depending on the type of power quality disturbance to be detected and analyzed. In each mode different wavelet analysis (discrete or wavelet-packet transform), with different mother wavelet, decomposition tree and different sampling rate is performed on the input signal either in real-time or off-line. The instrument also permits the partial implementation of a wavelet decomposition tree when we are only interested in a specific frequency band in the input signal. The results obtained in simulation and using real signals demonstrate the good performance of the instrument developed for the detection and analysis of different power quality disturbances in voltage supply.