摘要
高压输电线路发生故障后产生的暂态电流是一个包含故障信息的宽带信号。为了提取故障信息,先用平行结构的多速率滤波器组,将故障暂态电流信号并行分割为M个窄带信号,然后算出各窄带分量的能量。根据不同频带能量的比值,提出一种基于余弦调制滤波器组(CMFB)的暂态保护判据,进而提出一种故障诊断方案。此外,还对高压输电线路在不同时刻和位置的故障情况进行了仿真,仿真结果表明该诊断方案可行,而且由于对暂态电流信号的不同频带分量并行同步处理,因而实时性好。
The transient current, which is generated after high voltage transmission line fault, is a wide band signal that includes fault information. In order to obtain the fault information, the transient current signal is split into M bands using parallel multi-rate filter banks, and the energy of every band is computed. According to the ratio of the energies in different frequency bands, a criterion of transient protection based on the cosine modulated filter banks CMFB） is proposed. On the basis of the criterion, a scheme of high voltage transmission line fault diagnosis is presented. In addition, the faults at different time and position are simulated for high voltage transmission line, and the results show that the scheme is feasible and the real-time performance is good because of concurrent processing of the components in different frequency bands of the transient current signal.
出处
《电子测量与仪器学报》
CSCD
2008年第1期5-9,共5页
Journal of Electronic Measurement and Instrumentation
基金
国防基础科研资助项目(编号:A1420061264)
