Real time realization of highly reliable Cascaded Full-bridge Interleaved Buck Inverter based APF using T1FLC id-iq Control Strategy

This paper proposes a multilevel cascaded full-bridge interleaved buck inverter (CFBIBI) based active power filter using Type 1 fuzzy logic controller (T1FLC) and multicarrier PWM i(d)-i(q) control scheme with no shoot-through phenomenon. The conventional cascaded full-bridge inverter is comprised of multiple numbers of modular inverter cells and every single modular inverter cell consists of two power devices in each leg, however it still suffers from the shoot-through phenomenon with decreased reliability. As no shoot-through occurrence in each modular full-bridge interleaved buck inverter of its cascaded multilevel inverter, there is copious improvement in the reliability as likened to other cascaded inverters. Additionally, the dead time introduction does not necessitate in the full bridge interleaved buck inverter, as in conventional, which easily pushes the theoretical limit of duty cycle, and hence full energy transfer takes place to the load by pulse width modulation (PWM). The performance of multilevel cascaded full-bridge interleaved buck inverter (CFBIBI) along with the application as a shunt active power filter (APF) has been described in detail for the different voltage source condition. Simulation and OPAL-RT experimental results are presented for the validation of this multilevel cascaded full-bridge interleaved buck inverter based shunt active power filter.