Research on Isolated Grid Connected Series Resonant Inverter

Abstract

Galvanic isolation and power quality improvement are significant requirements in Grid Connected Micro-Inverters (GCMI). The efficiency, size and cost are the major concerns in isolated Grid Connected Inverters (GCI). This paper presents a novel single stage Isolated Grid Connected-Series Resonant Inverter (IGC-SRI) topology, employed for medium power applications. The size and cost of the proposed scheme is minimized by implementing fewer components. A soft switching technique through LC tank is employed which ultimately increase the overall efficiency of the system. Furthermore, a new resettable integrated based sampling control strategy is investigated to ensure soft switching. For a wide range of voltage gain, all switches operate under either Zero-Current-Switching (ZCS) turn-on or Zero-Voltage-Switching (ZVS) turn-off conditions. The proposed topology is simulated in MATLAB/Simulink environment.