| As air highways of energy transmission,Ultrahigh-voltage(UHV)transmission lines can solve the regional unbalanced problems between local loads and resources,as well as effectively alleviate the rub of air pollution,prevent or even cure haze,which was adapted to sustainable and low-carbon clean development.China has taken AC UHV as the main line construction,which provide important support for DC power transmission.With the maturing of UHV grid,related parameters of UHV line will directly affect protection computing,state analysis,economic research,etc.If the errors of line parameters are large,power grid operation personnel will make improper decisions and result in great harm which can spread to a wide range.Based on a case of AC UHV demonstrative project southeast shanxi-nanyang-jingmen transmission line,and aimed at the line parameters according to the true circumstances,this paper will take algorithm of line parameter identification as the research emphasis.In order to verify the proposed algorithm,take line model as the basis and fault location as line parameters’ application.This paper studied the line model of identified parameters.The paper studied improved traditional distributed long term equation,as well as the impacts of compensation devices on power flow of line compensations.A fusion method of clustering and robust used in identification line parameters was proposed in this paper,which can achieve denoising and calculation in one step and get small error results under different random noises’ influence.According to instance in this paper,set up UHV line model in MATLAB/SIMULINK platform,verified the algorithm has a wonderful robust performance under different random noises’ influence,and its identification results pressed close to true value.The accuracy of line parameters decided the precise of the results of fault location.Using identified line parameters in last section in the field of fault location.Take advantage of identified line parameters to calculate the situation of the fault,compared with utilizing typical line parameters to calculate the distance to fault.The results showed that using identified line parameters to calculate the situation of the fault’s can get resultswith small errors,verified the effectiveness of the identification method proposed in this paper. |
