A Triple Gain Five-Level Single-Phase Transformerless Inverter using Switched Capacitor for Renewable Power Applications

This paper introduces a new topology of a transformerless inverter with the triple voltage gain feature. The triple gain is achieved with the help of switched capacitor units. Boosting features are an essential part of renewable power applications. Triple gain removes the requirement of a front-end boost converter. It uses ten switches and four switched capacitors, out of which one switch is without an anti-parallel diode, and one is a bidirectional switch to achieve a five-level output voltage. All these capacitors are self-balanced capacitors that properly charge and discharge inherently by applying the required control strategy. It plays a vital role in generating multilevel Inverter voltage levels. Level Shifted Pulse Width Modulation (LS-PWM) controls the inverter operation. TLI output is analyzed for both UPF and LPF conditions. Further, voltage and current stress analysis is carried out for the optimum inverter design. Finally, the topology is verified in MATLAB Simulink for a 1 kW load to demonstrate the suggested inverter’s adequate performance.