A simple DQ current controller for single-phase grid-connected inverters

This paper presents a simple method to generate the grid current orthogonal component for a DQ current controlled inverter. Proposed method exhibits good steady state response and improved dynamic performance in comparison to the conventional Orthogonal Signal Generation (OSG) techniques. The improved characteristics of the proposed method enables the realization of Low-Voltage Ride-Through (LVRT) feature in single-phase grid-connected inverters. Simulation and experimental results show the feasibility and performance of this control structure approach.