A Time-Domain Calculation Method of Travelling-Wave on Double-Circuit HVDC Transmission Line with Shared Towers
Li Haifeng1, Wu Jiyang2, Liang Yuansheng1, Zhang Kun1, Wang Gang1
1.School of Electric Power South China University of Technology Guangzhou 510641 China 2.Maintenance & Test Center CSG EHV Power Transmission Company Guangzhou 510663 China
Abstract The double-circuit transmission line with shared towers is not balanced. Thus the frequency-dependent characteristic of traveling wave propagation, refraction and reflection are the key issue of its travelling-wave calculation. A time-domain calculation method of travelling-wave on double-circuit HVDC transmission line is proposed. Based on the vector fitting method and superposition theorem, the characteristics of refraction and reflection of fault generated travelling wave at the end of DC line are equivalent to the matrix of sequential wave impedance. Meanwhile, a time-domain step response matrix is used to calculate the frequency-dependent characteristics in the propagation process of travelling wave, which would avoid the complicated time-frequency conversion. Finally the PSCAD/EMTDC simulation model of a real double-circuit HVDC transmission lines with shared towers was constructed and extensive simulation results verify the validity and accuracy of the proposed method.
Li Haifeng,Wu Jiyang,Liang Yuansheng等. A Time-Domain Calculation Method of Travelling-Wave on Double-Circuit HVDC Transmission Line with Shared Towers[J]. Transactions of China Electrotechnical Society, 2018, 33(3): 573-580.
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2018, Vol. 33 
