Reliability Evaluation Method of Active Distribution Network Based on Optimization Model

Among the existing reliability assessment methods of active distribution networks, a simulation method is difficult to obtain exact index calculation results, and an analytical method is difficult to deal with the optimal load shedding problem of dynamic islands. In this paper, a reliability evaluation method of active distribution networks based on an optimization model is proposed. The method takes into account factors such as the randomness of distributed power supply, fault transfer and power flow reverse restrictions, and firstly establishes a multi-state model of distributed power generation, and based on the backward scenario reduction algorithm, the state of the random scene of distributed power output is analyzed and reduced. Given a specific reduced scenario, a mixed integer linear programming model for reliability index evaluation is proposed. By solving the model, various reliability indexes of the system can be obtained through the optimization mechanism. The main advantage of this method is that it is easy to be combined with network planning and optimization problems considering the reliability of distribution network. The accuracy of the reliability evaluation of the method is analyzed by a numerical example, and the extended application value of the proposed method is illustrated by the optimization problem of automatic and manual switch configuration of active distribution networks. © 2023 Chinese Society for Electrical Engineering. All rights reserved.