Distributed coordinated control of energy storage system in low-voltage distribution network

Abstract

Abstract With the increase of the photovoltaic penetration rate in the low-voltage distribution network, the uncertainty of its output has adversely affected the voltage quality of the power grid. In view of the relatively large R/X characteristics of the low-voltage distribution network, it is proposed to coordinate the active power of the optical storage unit injection system to solve the problem of voltage over-limit of the low-voltage distribution network. Aiming at the imbalance of the energy storage system participating in the voltage control process, a control strategy to coordinate the charging and discharging of each unit of the distributed energy storage system was proposed. At the same time, considering the capacity of the energy storage unit and the coordination of the initial state of charge, the capacity of the energy storage system is utilized to the maximum extent. Finally, the simulation verifies the effectiveness of the proposed coordinated control strategy.