摘要
当前我国特高压输电线路无源干扰的谐振主要引用IEEE的研究结论,然而IEEE认为该结论仅适用1.7MHz以下频率。针对于输电铁塔与地线相连的情况,根据IEEE的研究成果,归纳出依据地线感应电流特性判定输电线路无源干扰谐振的产生条件。以IEEE研究模型为对象,采用线天线和垂直极化平面波进行激励,结合输电线路无源干扰线电场积分方程与矩量法,计算并分析了100k Hz^3MHz频率的地线感应电流及无源水平。研究结果验证了IEEE提出的1.7MHz以下频率感应电流为无源干扰决定性影响因子的结论,但"整数倍波长回路谐振频率"预测准确性有限。
Currently, the research of reradiation interference resonance from the UHV power line mainly quotes the IEEE conclusion. However, the IEEE conclusion can be only applied to the frequency below 1.7MHz. For the case of power tower connected with ground wire, the predicting conditions of interference resonance are drawn from the characteristics of induced current on ground wire according to IEEE. The research model proposed by IEEE is excited by the wire antenna and the vertical polarization plane wave. Based on the wire electric field integral equa- tion and MOM, the induced current and the interference value are calculated and analyzed. The results show that, the IEEE conclusion, in which induced current is the impact factor of reradiation interference below frequency of 1.7MHz, is validated, while the accuracy of ＇ the N-wavelength loop resonance frequency＇ is limited.
出处
《电工电能新技术》
CSCD
北大核心
2015年第4期49-55,共7页
Advanced Technology of Electrical Engineering and Energy
