摘要
发电机纵向零序电压谐波成分复杂,含大量高、低次谐波及间谐波。常用的几种滤波方法对间谐波的滤除均不够理想。由此,提出一种基于频谱搬移原理的滤波方法,先将基波分量移至频率轴零点位置,再利用主带极狭窄的低通滤波器滤除非直流分量。该算法不仅能滤除各高次谐波,而且能很好地抑制间谐波。将该滤波方法应用于发电机纵向零序电压保护,能得到平稳、准确的基波幅值,提高了保护的性能。最后以实际故障录波数据为例,验证了该滤波方法正确、高效。
The longitudinal zero-sequence voltage of generators contains a large amount of harmonics and inter-harmonics. Given that the conventional methods are not effective in filtering inter-harmonics, a new method is presented based on the frequency spectrum shifting principle. First, the fundamental frequency component is shifted to the origin point of the frequency axis, and then a very narrow-band low-pass filter is used to filter out non-direct-current components. The method can filter high order harmonics and mitigate inter-harmonics, therefore improve the performance of the generator longitudinal zero sequence voltage protection. A real-life event record indicates the method korrect and efficient.
出处
《电力系统自动化》
EI
CSCD
北大核心
2008年第14期68-72,共5页
Automation of Electric Power Systems
关键词
发电机纵向零序电压保护
间谐波
频谱搬移
滤波
longitudinal zero-sequence voltage protection of the generator
inter-harmonics
frequency-shift
filtering
