Abstract:With a variety of distributed energy resources access to the distribution network, the power flow in distribution network varies with different operation modes. Traditional network topology tracing method which only considers the topology structure of distribution network is no longer applicable, the influence of power flow direction change on topology tracing needs to be considered. In this paper, a topology model is established according to the main power equipment and their connection in distribution network. The power flow of distribution network can be obtained based on state estimation results. Combined with topology model and power flow in distribution network, a computation method for breakers power flow is presented. The connectivity node / branch model based on power flow direction is established, and the model is applied to topology tracing. The application scenarios of multiple topology tracing are enumerated, and the implementation methods of topology tracking are described respectively in each application scenario. In this paper, the example analysis shows that the topology tracing method fully considers the influence of a variety of distributed energy resources on the distribution network under different operating modes. The calculation method is fast and the result is accurate, and it can provides dispatch decision support for the operator.