Structural optimization of urban distribution network for improving power supply capability

Aimed at problems faced during the process of rapid development of urban economic, such as substation layout and corridor scarcity, this paper proposed a method for structural optimization of urban distribution network which specifically focuses on the improvement of power supply capability. Firstly, according to the different locations and capacities of substations, power supply region of each substation can be determined by means of weighted Voronoi graph. Combined with the consideration of voltage drop at line end when the line is applied in load transfer between substations, overall contact structures of substations can be established. Secondly, based on the method which is grounded on transformer interconnection and N-1 principle and used to evaluate the power supply capability of distribution network, by adopting backward optimization method, a main transformer contact relation matrix which satisfies maximum power supply and minimum needed inter-station contact corridors can be identified thus determining reasonable inter-station contact structures under a certain power supply region. Finally, the effectiveness of the proposed method is validated by numerical examples of actual power supply regions.