A Distributed Dynamic Voltage Optimization Strategy for Integrated Transmission and Distribution Network

With plentiful distributed generations (DGs) connected with the distribution network (DN), the electrical coupling relation between the transmission network (TN) and DN is getting closer and closer. The fluctuation of load and the uncertainty of renewable energy make voltage control of the power system need more active predictive control over a longtime scale. Therefore, a dynamic voltage optimization model for integrated TN&DN system is established in this paper, and the voltage control characteristics of energy storage system (ESS) and various types of DGs are analyzed. The distributed algorithm based on the alternating direction method of multipliers (ADMM) is used to solve the global problem. The problem is decomposed into the TN subproblem, the DN subproblem and the correction of boundary dual variables by the algorithm, and iterate until the convergence condition is satisfied. Finally, the numerical test considering multiple DGs and ESS shows that the formulated model and the distributed method are effective.