Single-Phase Six-Switch Four-Port Boost Inverter With Active Power Decoupling

This letter proposes a novel single-phase six-switch four-port boost inverter with active power decoupling (6S4PwA). The four ports are two dc ports, an ac port, and a ripple port that acts as an active power decoupling (APD) circuit. A novel hybrid modified sinusoidal pulsewidth modulation (HMSPWM) scheme is proposed to operate the 6S4PwA. The proposed topology along with the HMSPWM scheme achieves high voltage gains at both the dc and ac ports and also eliminates the double-frequency ripple at dc ports. The ac film capacitor employed at the ripple port absorbs the 2ω ripple component, thereby eliminating dc-link voltage and inductor current ripples at two dc ports. Hence, the size of the dc-link capacitor and inductor at dc ports is reduced significantly. Overall, the proposed topology employs fewer components for four ports and reduces the size of passive elements, resulting in improved power density and reduced cost. To evaluate the performance of the proposed topology, a 500-W prototype is fabricated and tested. The experimental results show that the converter attains boost, inverter, and APD operations in a single stage and also improves power quality at the ac port.