The renewable energy resources such as the photovoltaic generation and the wind turbine generation are rapidly being introduced. In order to compensate the surplus and shortage of those output, the energy storage system such as the battery is expected to become the key technology in the future power system. In this paper, we focus on the scheduled operation of the virtual power plant (VPP) which is composed by distributed photovoltaic generations and the battery. The battery was installed to reduce the imbalance of the generated output from the scheduled output caused by the forecast error in our previous study. As the additional role for the battery, when the transmission system operator commands the upper limit of the VPP output, charging the surplus output over the upper limit is taken into consideration. The annual computational simulation of the VPP operation is implemented to show the effectiveness of the proposed method. To evaluate the performance, the accumulated value of the imbalance, the output suppression, the generated output and discharge are calculated.
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