A novel Fundamental Voltage Synchronization control strategy for shunt single-phase and three-phase active power filters

A novel control strategy to extract the reference currents for a shunt active power filter is presented in this paper. The method is a modification of the fundamental voltage synchronization (FVS) and can be applied to single-phase and three-phase three-wire or four-wire systems. Under unbalanced and distorted mains, the load plus the conditioner will demand a balanced and sinusoidal current, with unity displacement power factor. The control stage uses an autoadjustable synchronous reference frame (ASRF) for the synchronization to the positive-sequence fundamental component of the voltage in three-phase utilities or to the fundamental component in single-phase utilities. Experimental results testing the performance of the control strategy in a laboratory prototype in three-phase and single-phase systems are included.