Performance Evaluation of Different Optimal-Tuned Current Controllers for Voltage-Source Converter Connected to a Weak AC Grid

In this paper, three different current controllers that are tuned using different optimal tuning criterion are applied and tested for the operation of the voltage-source converter (VSC) under weak AC grid connection. The implemented controllers include the PI controller in the dq-frame, the PR controller in the αβ-frame, and the hysteresis controller in the abc-frame. The current controllers' gains have been optimally tuned using both analytical and evolutionary stochastic algorithms. The simulation setup is carried on Matlab/Simulink platform, and the results are assessed based on five metrics criteria; these include the rising time, the settling time, the percentage overshoot, the steady-state fluctuation, and the stability during a three-phase symmetrical fault.