A Novel Fractional order controller based on Fuzzy Logic for Regulating the Frequency of an Islanded Microgrid

Abstract

This paper proposes a novel fuzzy-based Hybrid controller in an isolated ac microgrid (MG). MGs mainly utilize the renewable energy sources (RES) like diesel engine generators, solar photovoltaic, wind turbine generator, fuel cell and energy storage systems such as battery and flywheel to provide local loads. Since RESs have a variable and uncertain nature, the imbalance between generation and demand occurs in MGs. In this condition, the severe fluctuations happen at system frequency, which eventually could lead to system collapse. In order to handle this condition, a novel fuzzy-based Hybrid controller is utilized to enhance the frequency performance. Moreover, the performance of the proposed Hybrid controller is compared with the integer order controllers and fractional order controllers. The results exhibit that the proposed Hybrid controller is more capable in stabilizing the MG frequency than other controllers. Finally, the sensitivity analysis is done to evaluate the robustness of the proposed controller against the changes of MG parameters.