Study On Operation Mode And Benefit Evaluation Of Large-scale Distributed Photovoltaic Access To Power Grid

Over the years,China’s energy consumption system has always been based on coal.This energy consumption model has brought about two problems:firstly,the lack of fossil energy,affecting the sustainable development of society;secondly,it has caused a serious environmental pollution,such as smog problems in recent years,has affected people’s healthy lives.In this context,distributed photovoltaic power generation technology has sprung up,and the era of "Energy Internet" with distributed energy as the entrance is coming to us.Realizing this transformation of fossil energy into clean energy is an significant object of China’s power source reform.Therefore,it is essential to study the operation mode and benefit evaluation of large-scale distributed photovoltaic access to power grid.Distributed photovoltaic project is one of the important ways to produce clean electricity.How to choose an appropriate operation mode of photovoltaic project to maximize the benefits is of great importance to the project.In view of this,this paper reviews relevant literatures systematically.Firstly,the stakeholder theory is used to analyze the rights and interests of the main participants in distributed photovoltaic projects,and the system dynamics method is used to analyze the relationships between the stakeholders.On this basis,the main operation modes at home and abroad are analyzed and summarized,and several commonly used domestic operation modes are compared and analyzed.Secondly,this paper comprehensively considers the impact of large-scale distributed photovoltaic grid connection on grid operation,and establishes a large-scale distributed photovoltaic access grid efficiency evaluation index system from three aspects of economy,environment and society.Thirdly,based on the ANP subjective weighting method and the entropy weight method objective weighting method,this paper constructs an integrated weighting model that takes into account the subjective and objective weighting method to calculate the index weights;and then,the traditional matter-element extension model and the ideal matter-element extension model improved by the ideal point method are respectively used to establish the benefit evaluation model of large-scale distributed photovoltaic access to the power grid.Finally,the comprehensive benefits under different operating modes are compared by example analysis.The results show that the proposed comprehensive evaluation method can determine the weight coefficient of the index very well,and the ideal matter-element extension evaluation model can more accurately rank the advantages and disadvantages of the comprehensive benefits of different operation modes.The research results of this paper are helpful to solve the problem of grid connection benefits of distributed photovoltaic projects and provide guidance for the investment and construction of distributed photovoltaic projects.