Frequency regulation of an Islanded AC micro grid with DFA designed fuzzy controller under various uncertainties

The present article highlights over frequency stabilization of an autonomous AC micro grid beneath various uncertainties. The micro grid comprises various distribution generations (DG) for generating power to meet respective demands. However the low inertia and huge dynamic nature of most DG systems puts adverse effect over system frequency. The inherent dynamic nature of load and various uncertainties i.e, wind fluctuations, solar intensity variation creates frequency instabilities in the autonomous grid. In order to improve system dynamic behavior especially system frequency under such disturbances, the article has suggested a fuzzy rule based PID controller (fuzzy PID) for necessary control actions in the micro grid system. A nature inspired dragon fly algorithm (DFA) is proposed to optimal design the suggested fuzzy PID controller. Finally, the performances of proposed DFA optimized fuzzy PID controller is compared with PI and PID control strategy to justify its superiority under various operating regions.