On Service Restoration Considering Frequency Characteristics of Distributed Generation

In order to solve the problem of service restoration in distribution network based on distributed generation, this paper treated it as a multi-object nonlinear optimization problem with constrains like the type, capacity and priority of important loads. Four possible operation modes are considered in this paper, and loads are classified into three levels. Further, islanding algorithm based on a new judging method is used to check network connectivity; load shed and network reconfiguration strategies based on bacterial colony chemotaxis optimization algorithm is proposed to achieve the objectives of maximum load restoration and minimum switch action; and the flexible power flow algorithm is used to check system frequency constrain. In the end, the service restoration strategy is verified using IEEE 33-node system, and simulation results demonstrate the effectiveness of the proposed method.