Performance of a parallel hybrid active filter with selective harmonic control

This paper presents a hybrid power filter as a combination of a three-phase, two-level, voltage-source converter connected in parallel with the 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 algorithm also has to ensure sufficient filtering at other harmonic frequencies. We propose using a proportional-resonant (PR), multi-loop controller. Theoretical analyses along with simulation results obtained from a Real-Time Digital Simulator (RTDS) verify the viability and effectiveness of the proposed hybrid filter.