Optimal configuration of the segmented switch in complex multi-interconnected feeder considering branch layer and different reliability requirements

The segmentation of line is one of the significant methods to improve the reliability of power supply. However, the distribution network planning still lack of scientific and systematic guidance for the segmentation of line. For the sake of the present situation that the actual planning is still empirical, a new method of optimal segmentation is proposed in this paper. Considering the characteristics of multiple interconnecting feeders with branch line, and a mathematical description of line branch faults is given. A mixed integer linear programming model based on The Flow of Failure Rate is constructed, which is applicable to the current mainstream overhead line and cable connection mode of the typical and complex line. The general solver is used directly to obtain the optimal number of segments and the location of the segments to meet the established reliability requirements under the actual planning. The correctness and effectiveness of the proposed method are verified by comparing with the segmented methods recommended by the current guidelines.