The number of chained lumped-circuits for the physical analogy of half-wavelength power transmission lines

2017 3rd International Conference on Energy, Environment and Materials Science

能源学;生态环境科学;材料科学

Zhan, Rongrong^1 ; Li, Yurong^2 ; Jiao, Chongqing^2 ; Yu, Yue^1 ; Meng, Jiangwen^1 ; Wang, Bei^2

State Key Laboratory of Power Grid Safety and Energy Conservation, Relay Protection Research Department, China Electric Power Research Institute, Beijing

100192, China^1

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing

102206, China^2

关键词: Broad application;    Equivalent lumped circuits;    Half wave-length AC power transmissions;    Half wavelength;    Point-to-point transmissions;    Relative errors;    Voltage waveforms;    Wave frequencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/94/1/012154/pdf
DOI  :  10.1088/1755-1315/94/1/012154

来源: IOP

【 摘 要 】

Half-wavelength AC power transmission (HWACT) technology is a mode for long-distance and large-capacity power transmission, has broad application prospect in ultra-distance point-to-point transmission mode. In order to implement physical analogy of HWACT lines, in general, the equivalent lumped-circuits consisting of some chained π-type circuits or T-type circuits are used in laboratory. The number of the chained circuits is the most important aspects in the physical analogy of HWACT lines. In this paper, the voltage waveform along π-type equivalent circuit is analysed for different number of the chained circuits. Next, the relationship between the number of chained circuits and the wave frequencies is discussed based on the relative error of the cascaded matrix (relative to the transfer matrix). For 50Hz, 32 chained π-type circuits can ensure the oscillation at the end of the waveform is small enough and the sending-to-receiving voltage ratio is approximately 1. The greater frequency is, the more the number of chained circuits required to establish good equivalence between the lumped-circuits and the transmission line. These works are instructive for the physical analogy of HWACT lines.