Distribution Network Planning Including Distributed Generation

Currently, more and more distributed generators (DG) access to distribution network, large power grid combined with distributed generators is the main development direction of the power industry in the 21st century. DG will have an important impact on distribution network when access to distribution network. It is closely related to its access schemes. Making some research about the distribution planning including DG is of great significance.Firstly, this paper analyzes the research status of the location and sizing of DG in distribution planning, the distribution expansion planning taking into account the DG and the particle swarm optimization algorithm at home and abroad.About the location and sizing of DG in distribution planning, most scholars assume that the output of DG keeps constant, make planning according to the average load or a maximum load. However, this model cannot reflect the actual operation of the distribution network. In view of the present disadvantages, the paper applies a planning model considering timing characteristics of load and DG. The planning year is divided into 8760 times, accounts the output of DG and the size of Load at each time interval. In the case, calculation results based on MATLAB programming, to solve the simplified planning model and the planning model considering timing characteristics of load and DG. Comparing the results, shows that the planning model considering timing characteristics of load and DG can get better planning scheme.About the distribution expansion planning taking into account DG, most scholars adopt the method of vertical programs, take regardless of the type and the operating time of DG. In view of the disadvantages, the paper applies a coordinated planning model based on annual duration load curve. In this model, we can determine the type, the installed capacity, the working time of the DG. Regard it as constraint conditions, particle swarm algorithm is used to get the DG location scheme and the network extension scheme. In the solving process, Change the traditional way of particle encoding, a new method of multi-encoding is applied, matrix encoding. And applies a new method to correction of infeasible solution according to the matrix encoding. In the case, calculation results based on MATLAB programming, to solve the distribution expansion planning model taking no account of DG, the distribution expansion planning model taking into account DG based on the peak load, the distribution expansion planning model taking into account DG based on annual duration load curve. Comparing the results, shows that the distribution expansion planning model taking into account DG based on annual duration load curve can get better planning scheme.