摘要
为研究特高压直流输电线路暂态保护,需要对故障暂态信号高频量的频率特性进行深入研究。分析特高压直流输电线路故障机理,提出由平波电抗器、直流滤波器和PLC滤波器组成特高压直流输电'线路边界'并分析其频率特性。根据云广特高压直流输电系统实际参数,建立云广特高压直流输电仿真模型,对特高压直流输电线路雷击、接地短路、高阻接地以及换相失败进行仿真分析,对各故障暂态信号进行频谱分析并对区内、区外故障的频谱特性进行比较,得到同一种故障在区内、区外故障时故障暂态信号的频率特性特点。
In order to study transient based protection of UHVDC transmission line, it is necessary to study the high frequency characteristic of fault transient signal. In this paper, the fault mechanism of UHVDC transmission line is analyzed. We use smoothing reactor, DC filter and PLC filter to form the transmission line boundary of UHVDC and analyze its frequency characteristic. According to the actual parameters of Yunnan-Guangdong ±800 kV UHVDC transmission system, the simulation model of Yunnan-Guangdong UHVDC is set up. The lightning strike, earth short circuit, high resistance ground and commutation failure of DC transmission line fault are simulated. The frequency spectrum of each fault transient signal is analyzed, and the frequency spectrum characteristics of internal and external faults are compared. At last, the frequency characteristics of transmission line faults which happen in different places are summed up.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第21期84-89,共6页
Power System Protection and Control
基金
国家自然科学基金资助项目(50977039
51105183
51267008)
云南省应用基础研究基金项目(2010ZC050)
云南省教育厅科学研究基金项目(09Y0057)~~
关键词
特高压直流
线路故障
线路边界
频率特性:暂态信号
频谱分析
UHVDC
transmission line fault
transmission line boundary
frequency characteristic
transient signal
frequencyspectrum analysis
