| Recent years,large number of renewable energy has been access to the distribution network as distributed generations.A comprehensive and sophisticated distribution network planning is needed to protect the reasonable and healthy development of distribution network.Substation planning is directly related to the future of network spatial layout,the generation’s distribution and utilization,reliability of power supply and economic efficiency of regional power grid.It is an important subject in distribution network planning.From the existing substation planning literature,the processing of distributed generations was relatively rough and there was no mathematical innovation in the mathematical method,which could not meet the requirement of the distribution network planning.Therefore,this paper analyzes the distributed generation method,and gives the matching method between distributed generation,load and substation.On this basis,considering the change of distributed generation permeability in the planning period,the planning model of distribution network substation taking into account distributed generation and load characteristics is constructed,and the corresponding mathematical solution method is put forward.The main contents are as follows:Firstly,a method of evaluating the capacity credit of distributed generation considering the load characteristics is put forward to ensure the reliability of regional power supply.Furthermore,the distributed generation capacity credit is selected as the same degree of distributed power output,diversity load characteristics and substation capacity,and the matching relationship between the three factors and the influence on the substation planning are deeply evaluated.Secondly,the target annual planning model of the substation considering the distributed generation capacity credit is established with the load saturation year as the planning target year.A model solution based on the improved weighted Voronoi diagram algorithm is proposed.The static programming of the substation target year is completed by the example simulation,which determines the substation site and substation capacity.Finally,the planning period is divided into multiple intermediate stages.Based on the results of substation site and capacity,a substation intermediate year planning model with distributed generation penetration is established,and a model based on genetic algorithm and heuristic algorithm is proposed.The method of solving the problem is completed by the example simulation,and the construction sequence of the substation is obtained.Taking into account the distributed generation,the distribution network substation planning reduce and delay the investment of the substation while fully absorbing the distributed power output,which has laid a good foundation for the sophisticated distribution network planning. |
