Procedure and Model of Antidisaster Differentiated Planning for a Power Distribution System

Physical topology is essential for antidisaster and disaster recovery abilities of power systems. Focusing on preparedness of physical topology, differentiated planning has been proposed, which refers to supplying power continuously to important special loads under disaster conditions by upgrading the construction standard of the selected subsystem, as well as installing distributed generation, microgrid, or movable generation. In this paper, the specific procedure of differentiated planning in distribution system is proposed, which includes identification and prediction of special loads, analysis of current status, measures of power supply for special loads, and high-standard power grid planning. The construction standard in the procedure not only depends on the voltage class but also the power supply for special loads. Then the model is established to select the subsystem components with minimum cost increment over general planning considering disaster scenario and general scenario. To solve the constrained optimization problem, genetic algorithm (GA) combined with minimum spanning tree (MST) and improved radial topology maintaining method is adopted. The case study shows the effectiveness of the proposed procedure and the model.