Research On Optimization Of Active Distribution Network Based On Source-Grid-Load-Storage Coordination

With the prompt progress of clean renewable power generation technology,power users have increasingly strict requirements for power quality and electricity economy,and the energy pattern dominated by fossil energy has gradually been broken.DG,such as wind energy and photovoltaic,has the peculiarities of flexibility,economy and environmental protection,so it is diffusely applicated in distribution networks,but with a good deal of DGs accessed to the distribution network,the power flow distribution has changed,facilitating the transformation of traditional distribution network to active distribution network.There are four segments of resources in the active distribution network,mainly for the source network load and storage,and the resources are logical allocated in the network,they play a momentous role in optimization to a certain extent,such as: peak shaving and valley filling,improving grid voltage,and improving economic benefits and wind and solar consumption.Therefore,coordinating and allocating the overall resources of source,grid,load and storage in the optimization process is of great practical significance to improve the economy and reliability of the distribution network.This paper mainly studies the optimization effect of source-grid-loadstorage coordination on active distribution network.Firstly,the characteristics of the four parts of the source,network,load and storage resources are analyzed,and the optimization effect of the coordination of resources is summarized and analyzed.This part analyzes the characteristics of wind and solar power supply,load and energy storage,and establishes the output model and the demand response model based on electricity price elasticity and load transfer rate,which provides a theoretical basis for the research of source-grid-load-storage coordination in this paper.Secondly,a two-stage planning model of source-grid-load-storage coordination is established to optimize the allocation of source-grid-loadstorage resources.In the first stage,a multi-objective optimization model was established to maximize the respective net benefits of DG operators,distribution companies and power users,and the location and capacity of DG were determined.In the second stage,the access position of energy storage is determined based on the network loss sensitivity,and secondly,on the basis of DG and energy storage location determination,the energy storage optimization model is established with the net income and voltage offset of energy storage as the optimization goals,and the energy storage capacity is allocated.Finally,to solve the model,the NSGA-Ⅱ.algorithm,entropy method and TOPSIS method are put forward,and in the IEEE-33 node system,the analysis of examples are carried out.The NSGA-Ⅱ.algorithm is put forward to solve the model,on the basis of the entropy method and TOPSIS method,the optimal configuration solution is opted.Three scenarios are put forward in this article,and the results of these scenarios are compared and analyzed,the comparison results demonstrated the superiority of source-grid-load-storage coordination.