Low-frequency ripple analysis and mitigation of Single-Phase Switched Boost Inverter and Reduced-Switch Current-Fed Switched Inverter

Abstract

Active-Front-End Impedance Source Inverters (AFE-ISIs), viz., switched boost inverter (SBI), current-fed switched inverter (CFSI), etc., are explored in literature as alternatives to the conventional voltage source inverter (VSI) in low power applications. They are more reliable against EMI noise and better protected against unintentional shorting of legs. Also, they can operate in both buck and boost modes, providing a wide range of operations. This thesis proposes a new AFE-ISI topology, named reduced-switch current-fed switched inverter (RSCFSI), which can provide improved voltage gain, continuous input current, and better efficiency than SBI. The derivation and steady-state analysis of RSCFSI are explained in detail. This thesis also proposes two PWM strategies for RSCFSI.