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Frequency-based wireless control of distributed generators in an isolated microgrid: A case of Geocha Island in South Korea

In this paper, we propose a frequency-based autonomous control strategy for an isolated microgrid with the grid-forming energy storage system (ESS) in the South Korean island of Geocha. This strategy uses a system frequency as a global data signal using a grid-forming ESS. The distributed generation (DG) units in the microgrid use the frequency as a control signal without communication because the DG units can check the frequency with their local measurements. By controlling the frequency of the grid-forming power converter in the ESS, the output of DG units in the system are controlled indirectly to retain the state of charge (SOC) of the ESS at a scheduled value. In order to verify the proposed method, a simulation of the Geocha Island power system with MATLAB/Simulink is undertaken. Simulation results show that the proposed control method has plug-and-play capabilities for DG units and maintains power balance and stability without communication or a central controller.