An adaptive filter for synchronous extraction of harmonics and distortions

This paper provides an adaptive filter for synchronous detection and extraction of harmonics. The filter can be used as integral part of the control system of a power electronic apparatus (e.g., STATCOM, APF, and UPFC) to generate the desired control signals. Stability and convergence analyses of the adaptive filter are presented based on dynamical systems theory. Performance of the filter is verified as a means for reference signal generation in a shunt active power filter.