摘要
在对±800kV特高压直流系统的线路故障、区外故障、雷击等暂态过程的暂态特征进行理论研究的基础上,利用小波变换对各种暂态电压进行了多尺度分析,分析结果表明,暂态电压故障分量的谱能量分布特点揭示了对应暂态过程的内在特征,利用这些特征构成暂态保护判据可以可靠地识别直流线路故障;通过PSCAD/EMTDC的大量仿真计算,验证该原理可靠性高、动作速度快,满足特高压直流线路保护快速、灵敏、可靠的要求。
Based on theoretical research on the characteristics in transient processes, such as line faults, communication failure, lightning stroke etc., which occur in a ±800 kV UHVDC transmission system, this paper makes a multiple-dimensioned analysis of various transient voltages using wavelet transform. Analysis results show that the energy distribution of the fault component in the transient voltage reveals the characteristics of the corresponding transient process and the transient protection based on these characteristics can reliably identify DC line faults. Comprehensive simulation using PSCAD/EMTDC has been made that validates the high reliability and speed of the approach presented, which can satisfy the requirement on UHVDC transmission line protection.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第21期40-43,48,共5页
Automation of Electric Power Systems
基金
国家自然科学基金重点项目(50337010)
"十一五"国家科技支撑计划重大项目(2006BAA02A30)~~
关键词
特高压直流线路
暂态保护
小波变换
谱能量
UHVDC line
transient based protectlon
wavelet transform
spectral energy
