Research On Large-scale Intermittent Renewable Energy To Smart Grid Vulnerability Index

Power industry is the foundation and lifeblood of the national economy,and power grid security is the premise and guarantee of its construction and development.In order to solve the increasingly serious problem of environmental pollution and energy shortage,the development of renewable energy has become the inevitable choice of the power industry.With the rapid development of smart grid,the development scale of renewable energy power generation is increasingly large,effectively promoting energy conservation and and easing the energy crisis.However,the drawbacks of renewable energy generation can not be ignored,as its intermittent,random and unstable output effects power grid security and power quality.Therefore,it is necessary to study the vulnerability of power grid after intermittent renewable energy is connected to the grid,and fully integrated smart grid technology to ensure the safe and stable operation of power systems.Based on the background of smart grid construction,this paper researches on vulnerability index of smart grid caused by the large-scale consumption of renewable energy systematically.Firstly,the paper summarizes the current situation of power grid vulnerability,the impact of renewable energy grid connection and power relevant index at home and abroad.Secondly,it introduces the basic theory of vulnerability,analyzes the research progress and development trend of smart grid,defines the vulnerability index of smart grid,and discusses the research ideas and methods.It lays a theoretical foundation for studying the vulnerability of the power grid.Thirdly,this paper analyzes the impact of grid-connected large-scale renewable energy on grid vulnerability and finds out the key sources of power grid vulnerability.On this basis,it selects the constituent elements of the smart grid vulnerability index,providing the basis for the quantitative analysis of the vulnerability index.Then,it integrates the improved AHP and the entropy weight method according to the maximum entropy principle.Simultaneously,the paper applies the fuzzy comprehensive evaluation method to set up the smart grid vulnerability index calculation model.Finally,vulnerability index calculation model of smart grid is applied to a certain power grid in Northwest,and its effectiveness and practicability are verified by empirical analysis.This paper analyzes the vulnerability impact of large scale intermittent renewable energy into the smart grid,uses the theory of maximum entropy fuzzy comprehensive evaluation to scientifically quantify the vulnerability index of smart grid,and the rationality of the evaluation system are verified by case analysis.The smart grid vulnerability index calculation model not only provides a new research idea for other power grid vulnerability assessment with renewable energy,but also provides a decision-making basis to prevent large scale power outages and ensure the safe operation of power grid.