Performance Analysis of 4-Leg IB APF for 3-Phase 4-Wire System with Renewable Energy Interface Fuzzy Control DC-Bus Capacitor

This paper proposes the 4-leg active power filter (APF), which consists of interleaved buck inverter interfaced with the photovoltaic (PV) renewable energy source. The photovoltaic renewable energy system along with the boost converter associated with the 4-leg interleaved buck active power filter (4L IB APF) is not only for harmonic compensation but can well handle the active power requirement during the load hike. The most perilous shoot-through phenomenon associated with the conventional 4-leg inverter is fully eliminated by this 4-leg interleaved buck inverter enhancing the reliability. The id-iq control strategy is used for the reference compensating current generation. Along with this, Mamdani-based fuzzy logic controller (MFLC) is implemented for the well control of inverter dc-bus capacitor voltage for having more sensitivity to harmonics, unbalancing and dynamic condition. The detail analysis of harmonic, neutral current, load unbalancing and active power compensation has depicted for nonlinear three-phase and single-phase unbalanced load for different voltage condition during steady and dynamic state. MATLAB/Simulation and OPAL real-time simulator results verify the efficacy and feasibility of the photovoltaic renewable energy-based 4L IB APF.