Enhance-Boost Switched-Capacitor/Inductor QZSI with High Step-up Pulse Width Modulation

Abstract

Two enhanced boost inverters with continuous input current and discontinuous input current are proposed in this paper. Applying two different switched-inductor structures in conventional continuous input current switched-inductor quasi-Z-source inverter (cSL-qZSI) can extend the ac output voltage gain of inverters in small duty cycles (shoot-through). Moreover, for the proposed topologies, a new pulse width modulation (PWM) technique with high boost ability is proposed. Compared to the simple boost (SBC) PWM technique achieving higher voltage gain with higher modulation index is the advantage of the proposed PWM technique. In this paper the governing relations of proposed topologies are calculated, then to validate the advantage of the proposed topologies, the proposed inverters are simulated in PSCAD/EMTDC with proposed PWM technique.