Abstract:

A DSP-based power quality monitoring system is introduced.Modular circuits for signal conditioning circuit and phase-locked frequency multiplication are also given.According to the modulus maximum theory of wavelet transform coefficient and multi-resolution decomposition of the transient signal which have been collected by the monitoring system,it accurately achieves the detection of the transient signal.Finally,according to the wavelet transform of the signal collected based on MATLAB,the result shows that wavelet transform can accurately detect the point of mutation of the power quality transient signal and testify the accuracy and reliability of wavelet detection.

Key words: power quality;wavelet transform;Matlab