Abstract
In an isolated microgrid, coordinated active power control is required for power balance under any circumstances. We propose a proportional control method based on the master-slave concept to achieve power balance even from insufficient power supply. This autonomous control method uses the frequency generated by the grid-forming battery energy storage system (BESS) as a global data signal. Other units are controlled indirectly. The frequency is controlled to be proportional to the AC voltage deviation of the grid-forming BESS for detecting sudden power shortages and for sharing active power. The effectiveness of the proposed method is verified by simulations in MATLAB/Simulink.
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