This paper proposes a very accurate harmonic current control for shunt active filters (SAF) using resonant compensators. The resonant control compensator based on sinusoidal internal model principle is introduced into the control system design in order to improve the control accuracy and performance for ac input signal. The proposed current control system is designed to operate with a single dq reference frame, synchronous with the 50 Hz supply voltage, for the compensation of all main harmonic currents, 5th, 7th, 11th and 13th. The principle of the proposed control method and the design procedure is presented. Experimental results confirm the accuracy and effectiveness of the suggested approach. Excellent harmonic current tracking performance can be achieved. Another major advantage of this strategy is the ability to eliminate the effect of an ac external disturbance from the harmonic components caused by the power supply
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Lenwari et al. (2006) studied this question.