特高压交流输电系统暂态故障电流分析

Analysis of Transient Fault Current of UHV AC Transmission System

特高压输电技术具有跨区域、大容量、远距离、低损耗等优势,建设特高压输电工程是我国电力工业发展的必然趋势。首先对长距离输电线路的分布参数模型进行研究,然后基于叠加定理、Clark变换和拉氏变换对晋东南-南阳-荆门特高压交流输电试验示范工程的暂态电流进行了详细分析,精确地求出了故障电流基波分量、非周期分量、高频分量的具体参数,最后经过叠加合成得到电流的时域表达式。经过ATP仿真比较,证明所提方法是正确可行的。

UHV AC Transmission System has many advantages, such as athwart large area,large capability, long distance, low power loss and so on. It is an inevitable trend to construct UHV AC Transmission System for the development of domestic electric power industry. Firstly, the distribution parameter model for long-distance transmission line is studied. Secondly,based on superposition theorem,Clark transformation and Laplace transformation,the transient current of Jindongnan-Nanyang-Jingmen UHV AC transmission system is analyzed in detail. The parameters of fault current including fundamental component,aperiodic component and high frequency component are obtained accurately. Finally,the time-domain expression is given through superposition. Compared with the ATP simulation, the method of this paper is proved right and feasible.