A Sliding-Mode Controlled Single-Phase Common-Ground Boost Inverter with Low-Frequency Current Ripple Reduction

This paper proposes a single-phase two-stage inverter with a common AC and DC ground configuration. This common-ground-type inverter is restructured through the amalgamation of a common-ground DC-AC inverter and a two-switch DC-DC boost converter. This combination aims to mitigate common-mode voltage phenomena and prevent leakage currents. A pulse-width modulation (PWM) technique is employed to facilitate the control of the inverter operation. Furthermore, based on a multi-loop controller configuration with a proportional-integral (PI) controller for the outer loop and an inner loop featuring a sliding mode current controller, this control scheme is tasked with mitigating the low-frequency current ripple in the input current. This control strategy is employed in renewable energy applications. The feasibility of implementing the Single-Phase Two-Stage Common-Ground Boost Inverter is thoroughly analyzed and validated through simulation results.