A New Control Method of Single-Phase Shunt Active Filters Using the Correlation and Cross-Correlation Coefficients

Abstract

This paper proposes a new method of detecting the active and reactive currents in single-phase circuits using the correlation and cross-correlation coefficients in the time domain. The active current is detected using the correlation coefficient between the source voltage and load current waveforms, and the reactive current is detected using the cross-correlation coefficient. The basic principle of the proposed detection method is discussed in detail, and then applied to the already proposed shunt active filter for consumer electronic equipment. The validity and practicability of the proposed detection method is confirmed by digital computer simulation. A reduced-scale experimental system is constructed and tested to verify the validity and practicability of the proposed method. Experimental results demonstrate that the proposed method can detect the active-reactive current in single-phase circuits in the time domain.