Harmonic Stability Analysis of a Microgrid Power System Using Different Controllers

A Voltage Controlled Inverter (VCI) is integral component of a grid-integrated microgrid as it serves as the interface between microgrid and utility grid. Therefore, the VCI need to be properly controlled. This paper presents four control schemes i.e.; PID, PI with anti-windup, Internal-model-control (IMC), and Proportional-resonant (PR) controller. The comparison parameters are selected as the output voltage and current waveforms of the VCI and total harmonics distortion (THD). A model is designed in MATLAB/SIMULINK and its simulation results are analysed. Comparing the results obtained from the system with each controller, it is found that PR controller helps to give better responses.