无源调谐半波长交流输电线路的工频过电压分析  

Power frequency over-voltage analysis of passive tuning half-wavelength AC transmission lines

作　　者：刘国霄 刘道兵[1] 李留根 代祥[1] LIU Guoxiao;LIU Daobing;LI Liugen;DAI Xiang(College of Electrical Engineering & Renewable Energy,China Three GorgesUniversity,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《电力科学与工程》2019年第3期23-30,共8页Electric Power Science and Engineering

摘　　要：内部过电压是半波长交流输电技术的关键问题之一,当前研究对象大多针对自然半波长线路而非调谐半波长线路。因此在分析自然半波长输电线路相关理论模型的基础上,研究非半波长线路的无源调谐技术,并对无源调谐半波长线路的过电压特性进行仿真分析。仿真结果不仅证明了3种调谐网络均可使非半波长线路实现半波特性,并且还表明了:空载工况下的π型和T型调谐线路的过电压水平均比自然半波线路和电容型调谐线路高;电容型调谐线路的甩负荷过电压水平相对较低;较之π型和T型调谐线路,电容型调谐线路工频过电压水平均更低且典型电压波形更贴近自然半波长线路的波形特性。Internal over-voltage is one of the key issues in half-wave AC transmission technology. Most of the current research objects aim at natural half-wavelength lines rather than tuning half-wavelength lines. Therefore, based on the analysis of the theoretical model of natural half-wavelength transmission lines, the passive tuning technique of non-half-wavelength lines is studied, and the over-voltage characteristics of passively tuned half-wavelength lines are simulated. The simulation results not only prove that all three tuning networks can realize the half-wave characteristics of non-half-wavelength lines, but also show that the over-voltage levels of π-type and T-type tuning lines under no-load conditions are higher than those of natural half-wave line and capacitance-type tuning line. Capacitance-type tuning line has relatively low levels of load rejection over-voltage. Compared with the π-type and T-type tuning lines, the capacitance-type tuning line has a lower power frequency over-voltage and the typical voltage waveform is closer to the waveform characteristics of the natural half-wavelength line.

关 键 词：半波长交流输电 调谐技术 过电压 甩负荷 接地故障 

分 类 号：TM726.1[电气工程—电力系统及自动化]