摘要
针对特高压线路典型分布参数特性,利用现代信号处理方法-最小二乘矩阵束法实时分析故障电流谐波。以1000 kV电压等级的输电线路为模型,用EMTP仿真建模,给出了最小二乘矩阵束法分析线路中间和末端发生单相接地和三相短路时的故障信号中的自由分量衰减特征。仿真结果表明,最小二乘矩阵束法以衰减指数函数为模型,能够快速、准确地计算出故障信号中的频率分布、相应的频率衰减时间常数以及含量。同时也给出了电科院1000 kV的动模波形和EMTP仿真波形的结果比较。动模分析结果表明,仿真模型合理,该方法很适合于暂态谐波分析,为分析暂态量对保护的影响提供指导意义。
To analyze the distribution parameter characteristics of UHV transmission line, we put forward the least square matrix pencil method （LSMPM） to identify the harmonic components of fault current, established a simulation model of UHV transmission line by EMTP software, and presented the decaying characteristics of free components under single fault and three phase short circuit fault by the least square matrix pencil method. The simulation result shows that the method can accurately compute the frequencies, and the decaying factors and corresponding a- mount because the signal model of LSMPM can be generally written as the sum of a series of decaying exponentials. The results between dynamic simulation system and EMTP model are compared. The results from dynamic simulation analysis show that the model in the EMTP simulation is suitable, and this algorithm is suitable for transient harmonic analysis and gives some guideline in transient protection.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第1期37-43,共7页
High Voltage Engineering
基金
国家自然科学基金(50677051
50877061)
国家重点基础研究发展计划(973计划)(2009CB219704)~~
关键词
特高压
暂态过程
谐波分析
奇异值分解
离散Fourier变换
最小二乘矩阵束法
UHV
transient process
harmonic analysis
singular value decomposition
discrete Fourier transform
the least square matrix pencil method
