Inverter Control Strategies for Power Quality Enhancement

This thesis investigates the effectiveness of inverter-based control strategies for mitigating voltage issues in LV grids. A simulation environment was developed using MATLAB Simulink, including models for typical urban and countryside grida based on Vattenfall AB’s distribution network. These models were also adapted for future inverter Hardware-in-the-loop (HIL) testing on the company’s Real Time Simulator (RTS) platform. Three control strategies were evaluated: (1) Q(U) control, (2) P(U) control, and (3) a combined P(U) & constant Q control method. The investigation focused on each controller’s ability to maintain voltages at the customer’s grid connection point within the regulatory bound of (230 Å} 10%)V , their responsiveness, and overall stability.