To meet the global warming, renewable energy sources like wind, solar and biomass generations are dramatically increasing. According to these dispersed generators growth, their negative impacts to commercial power systems quality become non-negligible, because their unstable output causes network voltage and frequency fluctuation. Micro-grid technology comes to the front to solve the problem. This paper presents the control paradigm and its application to Hachinohe micro-gird project, especially focusing on the power quality at isolated operation on which strict condition is imposed.The project, composed completely of renewable energy resources, was conducted in Hachinohe city, Aomori.
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