Enhancing Grid Stability in Distributed Power Systems: A Grid Voltage-modulated Direct Power Control Approach With Super-twisting Sliding Mode Control

Abstract

This paper introduces a novel approach, grid voltage-modulated direct power control (GVM-DPC), designed to enhance grid stability in the context of the growing distributed power systems. The increasing prevalence of distributed power systems has raised concerns about grid stability, exacerbated by harmonic distortion. To mitigate the adverse effects of grid voltage harmonics, we employ a bandpass filter in our proposed GVM-DPC. Moreover, we bolster the robustness of the power conversion system by integrating super-twisting sliding mode control, ensuring finite-time convergence of power tracking errors. To assess the efficacy of our approach, we conduct a comparative study between the GVM-DPC with the previous controller and our proposed method. The validation results with a hardware-in-the-loop (HIL) test show that the proposed method outperforms the conventional method by reducing the total harmonics up to 0.46%.