Design and Analysis of a State-Feedback-Controlled Hybrid Active Power Filter

This paper deals with reactive-power compensation and harmonics elimination using a hybrid active-power filter. It proposes a state-feedback-controlled hybrid filter as a combination of a three-phase, two-level, voltage-source converter connected in parallel with an inductor of a shunt, single-tuned, passive filter. This topological structure greatly decreases the voltage and current stress over the elements of the active filter. Since the topology is composed of a single-tuned branch, the control structure also has to ensure sufficient filtering at other harmonic frequencies. In this paper an integral, state-feedback, multi-loop controller is proposed. To design the controller a mathematical model of the proposed filter in state-space is developed first. The effectiveness of the hybrid active filter is demonstrated on a realistic industrial-network model by means of computer simulations. Copyright (C) 2011 Praise Worthy Prize S.r.l. - All rights reserved.