PLL-less control strategy applied to Hybrid Active Series Power Filter

A simple control strategy for the Hybrid Active Series Power Filter (HASPF) based on P+Resonant compensators is presented. The structure allows the compensation of multiple selective harmonic components simultaneously. No mains voltage synchronization techniques, like a PLL, nor any voltage sensing are demanded. The entire control algorithm is performed directly in the abc frame. Practical results are presented to demonstrate the control efficacy.