The induced overvoltage between UHV AC and DC transmission lines built on the same tower under fault conditions
The induced overvoltage between UHV AC and DC transmission lines built on the same tower under fault conditions
复制标题
故障条件下同塔特高压交直流输电线路间的感应过电压
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Qingmin Li
中科院分区：
文献类型：
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作者：
Qiuqin Sun;Wei Shi;W. H. Siew;Hongshun Liu;Qingmin Li
输电容量的快速增长和输电通道的环境限制，必然促进了交直流同塔混合输电线路的发展，特别是我国正在建设的特高压输电系统。然而，特高压交直流同塔输电线路之间不可避免地存在严重的电磁耦合效应。阐述了混合输电线路中感性耦合效应和容性耦合效应的产生机理及计算方法，建立了混合输电线路在不同故障条件下感应过电压的等效电路模型。详细分析了接地故障电阻、直流滤波器的布置方式、故障类型等关键影响因素对健康线路感应过电压的影响。采用相模变换法从理论上分析了特高压交流输电线路换位方式对降低混合线路感应过电压的影响。该方法和分析结果为实现特高压交直流混合输电线路的优化设计提供了可靠的参考。
Rapid increase of the transmission capacity and environmental limit of the power transmission passage have indispensably promoted development of the AC/DC hybrid transmission lines on the same tower, especially for UHV systems being established in China. Unfortunately, severe electromagnetic coupling effects will inevitably exist between the UHV AC and DC transmission lines built on the same tower. The generating mechanisms, as well as the computational methodology, of both the inductive and capacitive coupling effects within the hybrid transmission lines are elucidated in the paper, then an equivalent circuitry model is established as to analyze the induced overvoltage within the hybrid transmission lines under different fault conditions. Further, the impacts on the induced overvoltage on the healthy line from key influential factors, such as the grounding fault resistance, the collocation and layout of DC filters and fault type, are accounted for in details. Specifically, phase-mode transform method is adopted to theoretically analyze the effect of transposition mode of the UHV AC transmission line as how to reduce the induced overvoltage within the hybrid transmission lines. The proposed method and analyzed results present reliable reference for realizing optimal design of the UHV AC/DC hybrid transmission lines.