Feed-Forward Based Fuzzy Logic Controlled BESS for Enhancing the Frequency Stability of Islanded PEA-Microgrid in Thailand

摘要

With an advancement of the power system according to the economic growth, the frequency improvement of the microgrid remains a challenge. Hence, this paper proposes the Feed-Forward based Fuzzy Logic controlled (FFFL) BESS for enhancing the frequency of islanded Provincial Electricity Authority of Thailand (PEA) microgrid system, which consists of the residential and the Electric Vehicles (EVs) load centers, DGs and BESS. The proposed FFFL method is to compensate the current to both of the direct and the quadrature axis reference currents for utilizing in the BESS current controllers. The simulation results implemented on DIgSILENT PowerFactory software are completely demonstrated that the proposed method is able to enhance the frequency with an acceptable range of the PEA grid code requirement, when the microgrid is detached from the main grid, in comparison with the conventional BESS control methods. Moreover, from the simulation results with the proposed scheme correlated with the traditional BESS control technique, the number of loads being shed by the UnderFrequency (UF) relay is also significantly reduced with a superior performance.