Design and Analysis of D-Q Current Control Techniques for Single-phase Inverter Application

The paper proposes a DQ current controller for regulating the output power of a single-phase grid-connected VSI. The proposed controller generates the orthogonal component of grid current without introducing additional dynamics or distortions to the control loop, and is not dependent on system parameters. Compared to conventional orthogonal signal generation techniques, the proposed method exhibits better steady-state and dynamic performance, making it suitable for smart inverter applications that require advanced grid functionalities in compliance with revised standards. To demonstrate the feasibility and effectiveness of the proposed strategy, the controller is applied to a 500 Watts, 110V, and 50Hz single-phase grid-connected VSI and validated through simulation results.