New scheme of UHVDC transmission line protection based on Chebyshev window filter

作     者：Zhenxing Li Hong Tan 

作者机构：College of Electrical Engineering and New Energy China Three Gorges University Yichang People's Republic of China 

出 版 物：《The Journal of Engineering》 

年 卷 期：2017年第2017卷第13期

页      面：935-939页

学科分类：12[管理学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 08[工学] 

主　　题：lightning protection electromagnetic coupling synchronisation fault diagnosis power transmission faults fault currents Chebyshev filters HVDC power transmission power transmission protection power transmission lines transition resistance lightning resistance PSCAD/EMTDC simulation low-frequency component selection high-frequency pulse bipolar DC lines electromagnetic coupling data synchronisation distributed capacitance current influence elimination distributed parameter model current mutation polarity fault identify fault current characteristics Chebyshev window filter UHVDC transmission line protection 

摘      要：Based on the analysis of the fault current characteristics in ultra-high-voltage DC (UHVDC) transmission lines, a new method to identify the fault by using the polarity of the current mutation is proposed here. Firstly, the protection scheme here is set up as the distributed parameter model to eliminate the influence of distributed capacitance current and data synchronisation on protection. Furthermore, not only the characteristic harmonics of the DC side but also the electromagnetic coupling of the bipolar DC lines and the interference of the high-frequency pulse are considered; the Chebyshev filter is used to select the low-frequency component. Finally, the results of PSCAD/EMTDC simulation show that the proposed scheme not only has the advantages of reliable and low sampling rate, but also has the ability to withstand the transition resistance and the lightning resistance. In a word, the scheme has important reference value for the actual UHVDC projects.