中文摘要：

利用保护元件区分对侧区内外故障的特高压直流输电线路单端电压暂态保护原理能够实现线路全长保护.提取故障暂态量的特征频带对基于此原理的特高压直流输电线路暂态保护的研究非常重要.结合云广特高压直流输电系统实际参数,利用PSCAD/EMTDC建立云广＆#177;800kV特高压直流输电系统仿真模型.根据云广特高压直流输电系统边界实际参数,得出线路边界透射系数阻带.分析各种类型故障信号的频率特性,得出位于边界透射系数阻带内的故障信号主能量频带.故障信号特征频带是主能量频带内,满足衰减规律——线路及边界对故障信号的双重衰减效果要强于单个线路对信号的衰减的故障信号所对应的频带,特征频带内的故障暂态量能准确反映故障位置,可以提取特征频带内的暂态量作为线路暂态保护的故障信号.

英文摘要：

The single-ended transient based voltage protection method of UHVDC transmission line which uses pro- tector to distinguish the opposite inside fault from outside fault can protect the whole transmission line. Extracting the special frequency-band of fault transient signals is important to the study of transient based protection of UHVDC transmission line based on this theory. Accurate model of Yunnan-Guangdong ±800kV UHVDC Transmission System is built up with reference to parameters of actual system. The stop band of refraction coefficient of transmission line boundary has been obtained with reference to parameters of the boundary system. The main energy frequency band of fault signals in stop band of refraction coefficient has been concluded by analyzing the frequency characteristics of fault signals. And the special frequency-band in the main energy frequency is that corresponds to fault signals which accords with the attenuation law that the attenuation effect from dual function of transmission line and its boundary is stronger than that from single transmission line, and the fault location can be determined by using transient signals in special frequency-band, so it can be extracted as fault signals in transient-based protection of transmission line.