Compensation of nonstationary harmonics using active power filter with Prony's spectral estimation

Abstract

A novel control scheme for the filter is proposed that is based on the cosine timing control principle and is easily realized with the microcomputer software. The output current waveform of the filter can be determined in real time. Prony's spectral estimation is introduced for measuring the nonstationary harmonic currents. The time-varying harmonic spectrum obtained by Prony's method shows more reasonable results than Fourier analysis. The compensating ability of the filter is verified through numerical analysis studies.<>