Ring Distribution System Expansion Planning using Scenario Based Mixed Integer Programming

With the necessity to meet the strict grid regulations, cope with the smart grid trends and improve customer satisfaction, DSOs are required to provide grid expansions and enhancements in a cost-effective manner. A common approach to enhance the reliability of supply is for planning engineers to consider ring configurations as an addition to the standard radial feed structure. In this paper, a scenario based mixed integer programming method for ring distribution system expansion planning is proposed. The proposed model extends to consider multiple cable size options for each line corridor and offers the flexibility to select different ring configuration layouts. The proposed model is tested on a realistic 96 bus case study of the Singaporean distribution system. The results of two different test cases with and without considering emergency grid operation are presented and analyzed.