An evaluation of techniques for determining active filter compensating currents in unbalanced systems

S. D. Round & D. M. E. Ingram (1997): "An evaluation of techniques for determining active filter compensating currents in unbalanced systems", European Conference on Power Electronics and Applications (EPE '97), Trondheim, Norway, 8-10 September 1997, Volume 4, pp 767-772.

Accepted Version
epe_1997

Abstract

An active filter is used to eliminate current harmonics produced at a consumer’s site. This paper evaluates five different methods of determining the compensating current for an active filter that compensates unbalanced three-phase loads. The methods compared are notch filtering, Instantaneous Reactive Power Theory, Synchronous Reference Frame, sinusoidal subtraction and the Fast Fourier Transform. Simulation results have determined that the Fast Fourier Transform method provides good steady state and transient responses for active filters in unbalanced systems.