Research On Low Voltage Comprehensive Control Method Of Distribution Network Based On Information Gap Decision Theory

With the rapid growth of power load,the problem of low voltage in China has become increasingly prominent in recent years,which seriously affects people’s normal life and production,and restricts the economic development.Therefore,it is of great theoretical and practical significance to study a low-voltage comprehensive control strategy which can guarantee its comprehensive benefits for the low-voltage problem of distribution network.In this context,according to the current situation of distribution network,this paper proposes a comprehensive low-voltage control method based on safety efficiency cost and improved information gap decision theory.The specific research contents are as follows:1)The cause of low voltage is analyzed and the general control measures are summarized.An integrated low voltage control method for distribution network based on the cost of safety and efficiency and the improved information gap decision theory is presented.Firstly,the mathematical expression of safety and efficiency cost index is constructed by taking line modification,reactive power compensation,transformer voltage regulation and new substation as control measures.Then,considering the uncertainty of load prediction error,an improved information gap decision theory is proposed,which aims at minimizing the cost of the whole life cycle and meets the expected goals of safety index and voltage deviation index.A two-layer robust model for low voltage integrated control based on improved IGDT is constructed under the constraints of investment budget.Finally,a solution algorithm for this planning model is presented.2)A low voltage integrated control method considering load fluctuation,wind power output uncertainty and its correlation is presented.Firstly,the mathematic expression of the cost index of the whole life cycle is constructed by taking line modification,reactive power compensation,transformer voltage regulation and new substation as control measures.Then,considering the uncertainty and correlation of load fluctuation and wind power output,a robust model for low voltage comprehensive control of distribution network based on information gap decision theory is constructed,and Cholesky decomposition method will be used to solve the problem.Relevant random samples are converted into independent random samples,and the worst scenario is determined based on the sample characteristics.Finally,the model is solved by using an order optimization algorithm.