A voltage regulation method using distributed energy storage systems in LV distribution networks

This paper proposes a voltage regulation method using distributed energy storage systems (ESSs) in low-voltage (LV) distribution networks with high penetration of rooftop photovoltaics. The impact of renewable based distributed generation units on feeder voltages is investigated in detail. The voltage regulation method consists of two stages. The distributed control is proposed in stage one to coordinate distributed ESSs for voltage regulation. The power allocator is developed in stage two to determine the real and reactive power output of each ESS, so that the voltage regulation is achieved within the allowable operation ranges. The entire control structure makes sure that the voltages along distribution network are within the voltage limits while avoids depletion or saturation of ESSs under different operation conditions. The proposed method is tested in a LV distribution feeder and the simulation results validate the performance of the proposed method.