Study On The Optimal Reconfiguration Of City High Voltage Distribution Network

With the development of economy and peoples standard of living, power demand is increasing and the quality and economy of power supply become more and more important. It is an exigent problem how to optimize city high voltage distribution network. A detailed study is presented in this paper.Based on the theoretical study of optimal reconfiguration of middle voltage distribution network and the electrical and structural characteristics of high voltage distribution network, a Tabu rule of simplifying power network is presented in this paper. The power economy, safety and quality are included in the optimization objective. The modified genetic algorithm that complies with the characteristics of high voltage distribution network is used to realize the optimal reconfiguration of city high voltage distribution network.Firstly, electrical characteristics such as voltage grade, power supply types and power-angle variation of city high voltage distribution network were analyzed; structural characteristics such as connections among and inside stations were analyzed.Secondly, net model of city high voltage distribution network was described and the objective, constraints and optimal reconfiguration process of city high voltage distribution network were analyzed in detail.Thirdly, loop was defined based on the characteristics of city high voltage distribution network. Tabu rule was presented in order to shorten the length of code. Genetic algorithm was modified and coded branches in one loop were used to form the chromosome. The operation of optimum maintaining selection, gene shift and gene variation were adapted during the optimal reconfiguration. Meanwhile, the self-adaptation was introduced into the genetic operation in order to enforce the convergence.Finally, the influence of modified measures in GA on the final result was analyzed and a real network was applied to test the presented algorithm in the paper.