A Capacity Design Method of Distributed Battery Storage for Controlling Power Variation with Large-Scale Photovoltaic Sources in Distribution Network

It is expected for battery storage systems to control power variation with large-scale photovoltaic powers in a distribution network. Since the battery storage systems are additional components to distribution network, it is required to suppress peak power demand as well as to improve power-supply imbalance with the minimum storage capacity. A design method for distributed battery storage capacity has been developed for evaluating battery storage advantage on demand-supply imbalance control in distribution systems with which large-scale home photovoltaic powers connected. The proposed method is based on a linear storage capacity minimization model with design basis demand load and photovoltaic output time series subjective to battery management constraints. The design method has been experimentally applied to a sample distribution network with substation storage and terminal area storage as illustrated in Fig.1, with design-basis severe conditions on photovoltaic powers and demand loads as presumed in Fig.2. From the numerical results, the developed method successfully clarifies the charge-discharge control and stored power variation (Fig.3), satisfies 10% peak cut requirement, and pinpoints the minimum distributed storage capacity.