Approaches To Optimize The Realization Of Typical Connection Modes In Distribution Network With Consideration Of Reliability

Now, some structures of urban distribution networks in China are not very clear, which leads to the difficulty of maintenance and low reliability. The typical distribution network connection modes can improve the power quality and reliability. It is very significant to realize the typical connection modes in distribution network planning and construction for the improvement of the distribution network operation level. The typical connection modes can avoid the various management and operating problem brought by atypical connection modes.The thesis takes focus on the approaches to optimize the realization of typical wiring group in distribution network. Based on the geographic information system(GIS),the optimization models of paths, the foundational networks and tie-lines with consideration the reliability are established. With the genetic algorithm, the optimal implementation of typical wiring group is presented. The main work is as follows.Firstly, the distribution network path optimization model is established with considering the effect of environment on the construction cost. The objective of the optimization is to minimize the construction cost. Based on Arc GIS, the path set of alternative distribution lines is formed, which is the foundation of the following work.Secondly, based on the candidates of the distribution lines, the foundational network optimization model is put forward which objective function is minimum of the comprehensive annual fee including the outage cost. The constraint conditions are composed of the electrical constraints and topological constraints. The chromosomes in the genetic algorithm solution represent the foundational frames with binary coding. With the different loading rate, the foundational networks are obtained by the solution of the model.Thirdly, with the foundational networks, the tie-line optimization model for the implementation of the typical wiring group is established with the objective to minimize the comprehensive annual fee. The constraint conditions take consideration of the network topologies. The binary coding method is applied to represent the tie-line of the distribution network in the genetic algorithm. The implementation scheme of the typical wiring groups is achieved by the solution of the model.Finally, the implementation scheme of typical wiring groups under "2-1" and "3-1" modes can be optimized by the approach provided here in the real 10 k V distribution networks, which shows the effectiveness of the method. The approach is very important to improve the level of the power grid planning.