Affiliations: [a] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing, China | [b] Maintenance Branch Company of East Inner Mongolia Electric Power Company Limited, Tongliao, China | [c] Tongliao Electric Power Supply Bureau, Tongliao, China | [d] Chengdu Electric Power Supply Bureau, Chengdu, Sichuan, China
Correspondence:
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Corresponding author: Peng Cheng, State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China. E-mail:20121101018@cqu.edu.cn
Abstract: The reactive power compensation is of crucial importance
for the safe and stable operation of ultra-high-voltage (UHV) transmission
system. The icing and sag can lead to variation of circuit parameters of
transmission line, but it is difficult to calculate the reactive power of
transmission line with sag or icing by using circuit method. This paper
presents a 3-D power transmission model of transmission line based on
Poynting vector and finite difference frequency domain (FDFD) method to
solve this problem. The method is applied to evaluate the reactive power of
the 1000 kV transmission lines with sag and icing, and the influences caused
by icing and sag are discussed. The proposed method for the reactive power
calculation of transmission line would provide important reference for the
reactive power compensation in the snow-hit areas.
Keywords: Transmission line, Poynting vector, FDFD, reactive power
