Research on Effective Location of Energy Storage in High-Permeability Photovoltaic Distribution Network

Due to new energy, such as photovoltaics, character with intermittent and volatility, when connected to the grid, it seriously affects the voltage fluctuation of the distribution network system. Which brings new challenges to traditional voltage regulation technology. In order to solve these challenges, the energy storage technology is proposed. Firstly, from the positional relationships between the energy storage access points and the research nodes, the factors that cause the node voltage changes are studied. According to the voltage change difference caused by different energy storage access locations, the priority siting areas of energy storage are deduced. Then, the heuristic optimization method is used to find out the minimum power value of energy storage. This power value is the minimum value of energy storage to make each node's voltage within a safety domain when voltage distorts for the grid-connected photovoltaic. Afterwards, the effective location areas for energy storage are found by comparing the minimum power value in different situations. Finally, the correctness of the conclusion is verified by the IEEE33 node system. The simulation results show that the closer the energy storage location is to the end of the line, the more obvious improvement effects of system voltage will be, as well as the smaller energy storage capacity.