SOP Planning of Power Distribution System Based on Source-load Cluster Division

A robust planning model based on source-load cluster division is proposed to address the limitations of the current soft open point (SOP) in replacing only the alternative positions of the tie switches and the dimension disaster caused by arbitrary access node planning. This model is used to optimize the selection of soft switch access positions and capacities in the distribution network. Firstly, a comprehensive cluster division method for multi-objective distribution network is proposed, considering modularity, intra-cluster net power fluctuation, and net power peak fluctuation. Secondly, based on the cluster division, a robust planning model for soft switch distribution is established, with the objective of minimizing the annual comprehensive cost of the distribution network. Thirdly, the second-order cone programming model is transformed into a mixed-integer linear programming model using techniques such as equivalent substitution, polyhedral linearization, and Big-M method. The column and constraint generation algorithm (C&CG) is used to solve the proposed model. Finally, a case study of the distribution system of Taiwan Power Company (TPC) is used to validate the effectiveness of the proposed model, ensuring the economic feasibility of the distribution network planning and construction scheme. According to the calculations, the proposed method can reduce the O&M costs of the distribution system by 23.6% compared to the scenario without planning. Meanwhile, compared to the traditional planning method, the proposed method can reduce the cost of distribution system planning by 5.23%.