Distribution Network Expansion Planning Including Distributed Generation

In order to meet short-term and long-term power load growth and to ensure the power quality requirements, and minimum the distribution network system construction and operating costs during the planning of the network. Distribution network planning is to determine the optimal system-building programs according to the load forecasting results and the basic conditions of the existing network. Reasonable distribution network planning can save the distribution network construction funds, reduce network losses and improve power supply reliability. As more and more distributed power accessed distribution network, distribution network planning is necessary to fully consider the impact of distributed power. Accounting the distributed generation technology with network planning will become a research hotspot.This paper analyzes the benefits of distributed generation, and establish quantify and assess model of benefits of distributed generation. Provide certain reference for the development and application of distributed generation technologies in the future. And then discuss the distribution network expansion planning with distributed generation.Distributed generation technologies connected to the grid bring benefits, but for a long time, lack of reasonable and effective model to effectively quantify the benefits generated by DG. In this paper, a comprehensive analysis of DG to reduce network losses, environmental benefits, lower electricity prices, slow network upgrading, reduce power purchase costs, enhance supply reliability, improve the climate and other aspects of effectiveness and to quantify its benefits generated. Examples show that DG connected to the grid can bring considerable benefits, and the quantitative assessment model can accurately calculate of the benefits of DG.For the distribution network expansion planning with distributed generation, we establish distribution network expansion planning model that contains the DG model taking into account not only economic factors, reliability factors also brings environmental benefits. With grid planning objectives of economic, security, environmental protection among unified. The objective function including the line investment and loss costs, the DG investment and maintenance costs, savings due to DG power generation, power purchase costs, DG reliability benefits and avoid the environmental costs because of DG.The proposed improved genetic algorithm is used to plan the network expansion includes new load node, and assess the results to measure the merits of individual programs. The Monte Carlo method is used to simulate the output of the distributed generation, improved adaptive genetic algorithm is proposed to optimize the location of the distributed power, capacity, and new or upgrade lines. The algorithm uses invisible encoding, according to each generation of the individual fitness function, crossover and mutation operator to adjust, and with the help of graph theory the paper repair infeasible solutions in genetic algorithms. And eventually get a reasonable distribution network expansion planning programs.Numerical results show that distributed generation access distribution network can effectively reduce line losses, power purchase cost savings, environmental benefits, improve power supply reliability. Therefore, distributed generation is a new environmentally friendly technology, economic efficiency, reliability, efficiency, environmental benefits are very significant. Distributed generation in favor of the optimal operation of distribution network, and the distributed generation technology will bring distribution network beneficial effects, with a very broad application prospects.