A method to judge demand of UHV transmission lines on steady-state over-voltage device based on lossless transmission line theory

作者：Tang, Xiaojun^*; Fu, Hongjun; Hu, Yangyu; Meng, Yuanjing; Liu, Dongran; Qin, Xiaohui; Zhang, Wenchao; Ma, Shiying; Liu, Nan

来源：Power System Technology, 2011, 35(2): 1-6.

• High voltage reactors
• No-load conditions
• Over-voltages
• Power system simulations
• Simulation software
• UHV transmission line
• Ultra-high-voltage transmission lines
• Voltage distribution

Based on lossless transmission line theory, a formula to calculate the voltage distribution along ultra high voltage (UHV) transmission line, which is connected to power grid under no-load condition, is derived. During the derivation of the formula, the parameters of UHV transmission line and configuration of high voltage reactor in disconnected no-load transmission line are comprehensively considered, and the extreme length of UHV transmission line under different grid voltage connected to no-load UHV transmission line. Under the same voltage connected to no-load UHV transmission line, if actual length of UHV transmission line exceeds the extreme length, it is necessary to configure steady-state overvoltage device to avoid such a condition that the voltage along the connected no-load UHV transmission line exceeds 1000 kV. The proposed method remedy the defect of exising judging methods that depend on power system simulation software and a lot of simulations have to performed. Comparison of the judged result by the proposed method with the result from PSD-BPA simulation software shows that the proposed method can give accurate and reliable result.

• 出版日期2011-2