Optimization Of Reactive Power Configuration In Distribution Network With Distributed Generation

Energy conservation,emission reduction and clean energy applications are the trend of social development.Distributed generation is an important aspect of the rapid development of renewable energy applications.In the distribution network,with the gradual increase of the permeability of the distributed generation,the nature of the distribution network has changed.The original single source power supply has been transformed into multi-source power supply,resulting in the original distribution network calculation model and analysis method is no longer applicable.Reactive power optimization is an important means to ensure the economic operation of the distribution network.Therefore,it is of great significance to study the reactive power allocation of the distribution network connected to the distributed generation.In this paper,the grid connection and control characteristics of different distributed power sources are analyzed,which are equivalent to different types of nodes.The power flow calculation method of distribution network with distributed generation is given.The multi-stage optimization mathematical model of reactive power allocation in distribution network is established.The optimization objectives include the comprehensive power loss cost,the investment cost of reactive equipment and the penalty function of voltage exceeding limit in multi scenarios,and the corresponding constraints are determined.In order to improve the calculation efficiency of the solution method and reduce the calculation amount,the random branch breaking method is used to divide the feasible reactive power balance area of the distribution network with DG,and the compensation capacity of the area is determined according to the principle of the local balance of the distribution network.The power load impedance distance method and Floyd algorithm are used to determine the compensation point in the area,and finally the optimal results under different partition modes are determined The optimal value of objective function is the final scheme.Finally,the mathematical model and algorithm of reactive power allocation optimization for distribution network are compiled and verified by calculation examples.The calculation process and results verify the feasibility and effectiveness of the algorithm.