The concerns about the reliability of SMES have always been the obstacle to the practical application of SMES. In this paper, a fuzzy logic-based operating current regulation strategy, aiming at improving the reliability of SMES, has been proposed. In this control strategy, the current of SMES will be maintained in the best range during normal operation. When the temperature of magnet sharply rises after deep power exchange, the current of SMES will be down regulated to reduce ac loss and obtain more thermal stability margin. An application of SMES in microgrid is taken as an example to verify the control strategy. Simulation results based on MATLAB/Simulink demonstrate the feasibility and correctness of the control strategy.
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Gong et al. (2016) studied this question.
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