Feedback Linearization Control of a Grid-Connected Two-Stage Single-Phase Inverter

This paper discusses the control of a two-stage single-phase DC-AC inverter connected to both the grid and a battery. The main objective is to reduce the current ripple in the battery. The first stage is formed by a interleaved bidirectional DC-DC converter, while the second involves a single-phase full-bridge inverter. The Feedback Linearization Control (FLC) technique is proposed to control battery current ripple and compared to conventional PI control. The inverter is controlled by a Resonant Controller, with current reference generated by a single-phase Phase-Locked-Loop (PLL). The realtime validation using Hardware In-the-Loop (HIL) demonstrates the superior effectiveness of the FLC technique in mitigating battery current ripple. This study contributes to enhancing the performance of grid-connected energy storage systems.