Research On Operation Mode Decision And Operation Optimization Of Grid Connected Microgrid Group

Microgrid can effectively integrate renewable energy such as scenery,improve energy efficiency and promote the absorption of clean energy,which is conducive to the construction of new power system and the realization of green transformation of energy system.However,a single microgrid has defects such as small scale and poor stability.The emergence of a microgrid group can effectively solve the operation stability of a single microgrid.The cooperative operation of micro grid group can further improve the power supply reliability and renewable energy penetration,which plays an important role in the development of power field in the future.In addition to policy support,the key to the sustainable development of microgrid group is the benefits brought by the construction and operation of microgrid group.In order to maximize the economic benefits of the whole microgrid group project,it needs to be solved from two important stages,namely,the selection of operation mode in the project construction stage and the specific operation optimization after the project is completed.These two stages can solve the two major problems of "who will operate" and "how to operate".Therefore,this paper focuses on the decision-making of operation mode before the construction of grid connected micro electric network group and the optimization of project operation after completion.Firstly,by reading the domestic and foreign literature,this paper makes a basic research on the development background and current situation of microgrid group,and the research content,research purpose and significance are determined and the specific technology roadmap is given.Secondly,the paper analyzes and summarizes the composition structure and characteristics of micro grid group,the distributed power supply is modeled,and the multi-attribute decision-making theory and decision-making index processing method are described.Then,the cost-benefit composition of the micro grid group project is analyzed in detail,and the corresponding cost-benefit model and present value model are established.On this basis,the comprehensive decision-making index system and the micro grid group operation mode decision-making model are constructed,In the example analysis,TOPSIS method and TOPSIS method based on grey correlation are used to sort the schemes.The research results provide a theoretical reference for the selection of operation mode of regional micro grid group.Finally,based on the analysis of the feasibility of applying the two-layer optimization model to the operation optimization of microgrid group,the two-layer optimization model of microgrid group is constructed with the upper and lower objectives of maximizing the benefits of microgrid group operators and each microgrid.The improved multi-objective particle swarm optimization algorithm is adopted to solve the problem.The results show that the optimization model can significantly reduce the power purchase and sales cost of each microgrid operation and improve the operation efficiency of regional microgrid,and effectively solve the problem of how to improve the economic efficiency of microgrid group projects in the specific operation process.This paper enriches the theory of micro electric network group,and the methods used provide new ideas and method support for the related research of micro electric network group in the future.The research conclusion on the decision-making of operation mode before the construction of microgrid group projects solves the ownership problem of investment,construction and operation of microgrid group projects,and provides a certain reference basis for project preparation and operation;After the completion of the project,the operation optimization research reduces various costs and improves the operation income in the operation process.Through the research of these two stages,all kinds of costs of microgrid group projects are reduced,which is conducive to improving the economic benefits of the whole life of the project,so as to promote the large-scale development of microgrid group in practice.