Improving Reliability of Isolated Microgrid-based Solar Energy Using Fuzzy Controlled-Flywheel Energy Storage

Document Type : Original papers

Authors

1 Department of Electrical Engineering Aswan University

2 Department of Electrical Engineering, Faculty of Engineering, Aswan University, Aswan 81542, Egypt

3 Department of Electrical Engineering, Aswan University, Aswan, Egypt

4 Electrical Engineering Department, Faculty of Engineering, Aswan University, Aswan, Egypt

Abstract

Islanded microgrids (MGs) deliver essential electrical power to remote areas utilizing renewable energy sources (RESs). The most common RES is solar power generation (SPG). Still, these systems have several serious issues with the natural conditions of temperature and solar radiation, which reduces the reliability of the MG and may negatively affect the voltage level and frequency regulation. Energy storage techniques are important in overcoming the above issues with the island MGs. This study presents an effective control method to improve the performance of the islanded MG during normal operation and critical circumstances by employing a flywheel energy storage system (FESS) based on a fuzzy logic controller (FLC). Three scenarios are examined at different solar radiation conditions and load demand with the MATLAB/Simulink platform. Regarding Scenario 3, as a worst case, the percentages of the minimum undershoot and maximum overshoot frequency values are 4.18% and 1.1% in the case without FESS, respectively, where these are 0.98% and 0.32% with FESS, respectively. On the other hand, the percentages of the minimum undershoot, and maximum overshoot values of the common connection point (CCP) voltage can be reduced from 2.3% and 6.3% without using FESS to 0.79% and 5% when using FESS, respectively. The simulation results demonstrate that the suggested method is superior at reducing frequency and voltage fluctuations, and the dependence on the diesel generator is reduced.

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