Secondary Controller for Voltage and Frequency Regulation in an Islanded Microgrid System Based on Anti-Windup Loop

Abstract

This paper presents an anti-windup (AW) proportional-integral (PI) secondary controller for both voltage and frequency restoration and stabilization for a stand-alone Microgrid (MG) system. The MG comprises four distributed generations (DGs) with distributed droop-based primary control systems and a centralized AW based secondary controller. The significance of this research is using a clamping model of the AW proportional-integral (AWPI) controller to suppress the possible overshoot or undershoot of the control signal during the secondary control operation and reduce the settling time of the PI controller. The suggested technique considers the voltage and frequency coupling in the stand-alone MG system. Some load and generation change scenarios are also modelled to approve the plug-and-play capability of this novel control fashion. In the end, the performance of the proposed control system is verified by using MATLAB®/SIMULIMK software.