Split-source inverter with adaptive control scheme-based shunt active power filter for power quality improvement

Abstract

Although single-stage inverters are popular for simpler design they face difficulties in shoot-through mode operation. Insufficient DC voltage regulation and complicated LC network are principal drawbacks of these topologies. A new split source inverter (SSI) can solve problems with single-stage inverters. In this paper, SSI replaced the voltage source inverter (VSI) of a shunt active power filter (SAPF) which alleviates power quality (PQ) issues in power system. Furthermore, a VSI-based SAPF faces challenges to maintain consistent voltage across DC-link capacitor, exactly compensating current generation, and switching loss reduction in inverter. This study examined efficacy of two inverter-based SAPFs considering a modified synchronous reference frame approach for generating reference current; fuzzy logic controller for regulating DC-link voltage; and adaptive fuzzy hysteresis current controller for generating switching pulses. Ideal and non-ideal sources were considered when running the simulations for various load circumstances. The proposed SSI-based SAPF with an advanced control approach can eradicate source current harmonics to 0.52% and 0.45% under ideal source conditions, and 0.65% and 0.54% under non-ideal source conditions for non-linear loads. Similarly, the ripples in the DC-link voltage are also reduced to 2–3 V for the ideal case and 4–5 V for non-ideal case.