Primary Frequency Regulation of Isolated Microgrid based on Three-Dimensional Fuzzy Logic Control for Deloaded PMSG Enhanced by Diesel Generator

Abstract

This paper introduces a new method to improve the performance of an Isolated Microgrid (IMG) composed of five Wind Turbine Generators (WTGs) based on a Permanent magnet Synchronous Generator (PMSG), one Diesel Generator (DG) and Variable Load (VL). Indeed, to provide relief to the IMG during depressed frequency conditions, deloaded WTGs are controlled, using their energy reserve margin supported by DG. The frequency support from individual WTGs is controlled on the base of the available reserve, which depends on the prevailing wind speed. Therefore, in response to the primary frequency deviation, the pitch angle is controlled. The frequency regulation is significantly improved in terms of stress reduction on WTGs during low wind speed. Mainly, a robust pitch angle control strategy based on energy management using Fuzzy Logic Control (FLC) and Deloaded Control (DC) is improved. The system operation is investigated under a variety of conditions to prove the efficiency and stability of the system with the proposed technique. Simulation results have shown the effectiveness of the proposed control strategy via the MATLAB/Simulink environment.