Fuzzy Logic Controller based STATCOM for Voltage Profile Improvement in a Micro-Grid

Abstract

Microgrids constitute a very essential part in today’s power system for fulfilling the increasing power demand but when working under isolated conditions microgrids become very vulnerable due to the fact that normally microgrids have small generation capacities and most of the generation sources are renewable/constant power sources, which reduces the transient as well as voltage stability limits of a microgrid when working under isolated conditions. In this work a single synchronous generator based isolated microgrid system is studied. The microgrid system feeds power to a concentrated time varying load. Fluctuation in load causes variation in the load bus voltage which reduces the stability of the system. A Static Synchronous Compensator (STATCOM) is used to improve the voltage profile of the load bus. Two different controllers: PI and fuzzy logic are used for the control purpose of the STATCOM. The performance of the STATCOM with both the controllers is evaluated with different load conditions: R-L load, nonlinear load and dynamic load. The results are analyzed and compared. The simulation is done in Matlab/Simulink.