The authors constructed a micro grid by interconnecting multiple power sources. Low cost cooperative operation method of PV and DG was developed. The proposed method was evaluated by time axis simulation. It is possible to stably supply electric power following various load fluctuations at the factory. Furthermore, the voltage and frequency quality was verified by acquisition of long term actual measurement data. The results of verifying the fuel consumption reduction amount are described. It is possible to minimize the installed capacity of storage batteries, reactive-power compensators, for frequency and voltage stabilization by introducing renewable energy.
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