摘要
采用半波长交流输电方式时,当输电线路的总长度不足半波长时,输电线路特征将不再满足半波输电特性,需要对输电线路进行人工补偿。移相变压器可以改变输电线路末端电压幅值和相角,基于移相变压器的原理对非半波输电线路末端电压进行微补偿分析。结合某1 000 kV交流输电线路参数,在PSCAD中搭建基于移相器的半波输电系统,对输电线路总长度略小于半波长输电线路末端电压的补偿效果进行分析。仿真结果表明,移相变压器补偿可以有效降低沿线电压、电流,补偿后输电线路沿线电压、电流与半波输电线路基本一致,满足半波输电要求。从而证明了移相变压器对非半波长输电线路微补偿的有效性和可行性,为半波长输电线路调谐提供新方法。
If the practical line length between its two ends is shorter than half wavelength when half-wavelength AC power transmission（HWACT） technology is used,characteristics of transmission line are no longer fit for the half-wavelength power transmission characteristics,then appropriate technology should be employed to compensate the electrical length manually.The phase-shifting transformer compensates the terminal voltage of the non-half-wavelength transmission line,and it can change the terminal voltage amplitude and phase angle of transmission line.Based on the actual parameters of a certain 1 000 kV AC transmission line,a half-wavelength transmission system based on phase shifter is built in PSCAD to analyze the terminal voltage compensation effect for transmission line when its practical line length between its two ends is shorter than half wavelength.The simulation results show that the compensation of the phase-shifting transformer can effectively reduce the voltage and current along the line.After the compensation,voltages and currents along the transmission lines are basically the same with the half-wavelength transmission lines,which meets the half-wavelength transmission requirements.It proves the validity and feasibility of phase-shifting transformer for micro-compensation of non-half-wavelength transmission lines and provides a new method for the tuning of the half-wavelength transmission lines.
作者
王威峰
周飞
赵成勇
于弘洋
WANG Weifeng ZHOU Fei ZHAO Chengyong YU Hongyang(School of Electrical and Electronic Engineering, North China Electric Power University, Changping District, Beijing 102206, China Global Energy Interconnection Research Institute, Changping District, Beijing 102209, China)
出处
《智能电网》
2017年第8期800-803,共4页
Smart Grid
关键词
半波长
电气长度
移相变压器
补偿效果
half-wavelength
electrical length
phase-shifting transformer
compensation effect
