According to the literature, the power batteries can be broadly divided into the following three categories as their usage. The first is a system frequency fluctuation suppression measure, which has been used mainly in thermal and hydroelectric power plants, but in recent years, demand and supply adjustment with a fast responsive power storage battery system has come to be expected. Secondly, it is used as a measure against surplus power, and surplus power is generated during the daytime due to the recent large-scale integration of photovoltaic power generation. In order to avoid the wastage of such natural energy, it is useful method that charges the battery with surplus energy like a pump in a pumped storage hydropower plant. Third, it is used as a virtual power plant, which is the theme of this book. Charge and discharge capacity of batteries installed in a distributed manner is centrally controlled by advanced ICT network technology. This is a convenient method that controls the charge and discharge power as a single power plant by remotely controlling the grid-connected power conditioner of the power storage battery system group.
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