Accuracy Improved Dispatch Method for Distribution Networks with Battery Energy Storage Systems Based on Dynamic State Estimation

Power system service dispatch plays an important role in grid stability and profitability. However, frequent changes in the power system influence the accuracy of measurement in dispatch. To eliminate the residual between pseudo-measurement and actual value, the dynamic state estimation (DSE) is adopted into the energy management system (EMS). Furthermore, a battery energy storage system (BESS) is introduced into the power system to improve the regulation ability and reliability of the power grid. In this paper, a real-time BESS service dispatch method based on dynamic state estimation is proposed to increase the accuracy of the service provider and realize the precise regulation in the power system. First, the different algorithms which realize DSE are proposed to estimate the state of bus voltage magnitude and angle, and the proposed state matrixes are suitable for the dynamic power system. Second, the service model of the objective function and constraints are proposed based on BESSs to reach the aims of different services. Finally, the DSE algorithm with greater performance is chosen according to the simulation, and the proposed improved unscented Kalman filter (UKF) method increases the performance indicators at least 3 times