Current harmonics compensation with three- phase four-wire shunt hybrid active power filter based on modified D-Q theory

This study presents a D–Q current control method with modified phase lock loop to generate the required reference current for shunt hybrid active filter (SHAPF) to improve the power quality. The performance of the proposed controller has been evaluated in terms of harmonic current mitigation and reactive power compensation under different grid conditions. Here, the passive elements of SHAPF have been used for compensation of lower order harmonics and the active part mitigates the higher order harmonics. Proportional–integral controller is considered here for DC-link voltage regulation of the inverter. For verification, the proposed controller of SHAPF is compared with the conventional SHAPF controllers. Extensive simulations of the proposed technique are carried out through MATLAB–SIMULINK environment. A laboratory prototype has been built on dSPACE1104 platform to verify the feasibility of the suggested SHAPF controller. From the simulation and experimental results, the robustness of the proposed SHAPF controller is proved.