Research On Smart Grid Vulnerability Index Equation Of Large-scale Wind Power Consumption

The safe and stable operation of power grid is a powerful guarantee to promote the development of national economy and society.With the increase in power demand,and the growing pollution problems caused by traditional fossil energy,wind power has become one of the important ways to solve the current power supply and environmental problems,and with the rapid development of smart grid,large-scale wind power accommodation has become a reality.Because of wind power's intermittent and randomicity,large wind power could cause some unpredictable vulnerability occurring at smart grid,it makes the operation of power system becoming more and more complex.Therefore,it is important to do research on evaluation of smart grid on vulnerability caused by large-scale wind power,to find out the weak links in the smart grid,enhance its security and stability,and improve the reliability of smart grid.Based on the background of consumption of wind power and smart grid construction,the paper conduct a comprehensive and scientific evaluation on vulnerability of the smart grid caused by large-scale wind power,based on this,the vulnerability index equation of smart grid is constructed.Firstly,the paper introduced the vulnerability assessment theory of power grid,and the impact of large-scale wind power integration on the vulnerability of smart grid is analyzed,and the vulnerability source is identified.Secondly,based on the identification of vulnerability source,from the five aspects of environment,structure,equipment,management,and the level of intelligence,the components of the vulnerability index of the smart grid were select.Then,the vulnerability index equation of the smart grid is established by combining the risk theory with the fuzzy comprehensive evaluation,the paper used the components of the vulnerability index to refer to variables of exponential equation,establishing the vulnerability evaluation index system,using the product of probability and severity of accident as the basis for the assignment of the index;the paper used the weight of evaluation index to refer to variable coefficients of the equation,comprehensive empowerment method combining analytic network process with variation coefficient method is used to calculate the index weight.Finally,the vulnerability index equation model is applied to a certain power grid in North China,and the effectiveness and practicability of the model are verified by the results of an example.In this paper,the vulnerability of smart grid is quantified by exponential equation model,it provides intuitive evaluation results for the vulnerability research of smart grid,and a scientific basis for providing targeted measures to prevent the vulnerability of smart grid,and provides auxiliary decision information for the relevant planning,design and operation personnel,so as to promote the healthy development of smart grid.