Multi-Objective Distributrd Optimal Dispatch Of Active Distribution Network Based On Alternating Direction Method Of Multipliers

In recent years,with the rapid consumption of global fossil fuels and the rapid development of new energy technologies,penetration of distributed energy in the distribution network is increasing.Traditional distribution network is gradually evolved into active distribution network with characteristics of flexible control,high user interaction and high energy efficiency.Large-scale infiltration of distributed energy has a great impact on power quality,operating costs and many other aspects.Therefore,in order to achieve all distributed energy coordinate to use,improving the distribution network optimal dispatch method is an imminent problem.In order to solve the problem that with the distributed energy penetration rate getting higher,the traditional centralized optimization dispatch is faceing a series of problems,such as low efficiency,low reliability and high hardware requirements such as computing and storage equipment and communication bandwidth.This thesis propose a distributed multi-objective optimal dispatch method in active distribution network based on alternating direction method of multipliers(ADMM).Each partition can determine the different optimization goals based on different interests of actual situation and demand,which greatly improve the flexibility.First,distributed multi-objective optimal dispatch model is established,including real-time and pre-day dispatch,each partition can determine the optimization goal among smallest cost,highest renewable distributed power consumption rate and best power quality according to actual situation.Then,relax the constraints to become convex fuction,and introduce auxiliary variables to make mathematical transformation,so as to use ADMM to perform iterative parallel calculation between adjacent partitions.In addition,the calculation process of asynchronous iteration is used to further improve the computational efficiency,and the optimal flow pattern is used to solve the problem of weak ring network,which improves the applicability of the method.Based on the simulation analysis of the improved PG & E-69 nodes distribution system and comparing the results of the centralized optimization dispatch based on the interior point method and other distributed optimization method,The simulation results show that the method proposed in this thesis can achieve high comprehensive satisfaction and computational efficiency in the multi-region and multi-objective optimal dispatch of active distribution network.