A Comparative Study between Time-Domain Symmetrical Components Extraction Method and Proportional-Resonant Control Method under Unbalanced Grid Voltages Conditions

This research paper examines two different three-phase grid-connected inverter control approaches when the grid voltage is unbalanced. The considered approaches are a time-domain symmetrical component extraction method using a proportional controller and a modified proportional-resonant control strategy. The primary goal is to examine and compare the key similarities and distinctions in steady-state performance, dynamic performance, and complexity. A three-phase grid was tested considering an unbalanced resistive load, an unbalanced grid inductance, and unbalanced grid voltages. The efficacy of each control strategy is supported by hardware experimental findings using the dSPACE-DS1202 for a real-time interface platform.