FPA tuned Extended Kalman Filter for Power Quality Enhancement in PV integrated Shunt Active Power Filter

Harmonics in the system degrade the quality of power. Due to obvious presence power converters and nonlinear loads in the system, impact of harmonic increases. This necessitates improvement of power quality through mitigation of grid current harmonics. On the other hand, advancement in power converter topologies allows wide amalgamation of renewable source such as solar, wind, etc. into the power system for clean power generation. This paper presents photovoltaic (PV) fed grid-tied shunt active power filter (SAPF) with extended Kalman filter (EKF) based control. PV power conversion as well as effective harmonic mitigation has been ensured by the proposed controller. EKF based control is suitable for the nonlinear systems but its performance mainly depend on the tuning of parameters. Optimal tuning performance is ensured by using flower pollination algorithm (FPA). Reference current is generated using the proposed control technique which estimates the harmonic current. Applying the proposed control technique in MATLAB/Simulink environment, the PV SAPF is verified under distinct test cases such as unbalanced supply, load change, and under varying irradiation condition. The developed control strategy is validated comparing with a conventional control technique.