摘要
目前直流线路行波保护的研究均未全面考虑线路上各元件对故障暂态分量的影响,导致保护的可靠性不足。针对上述不足提出了具有普遍性的分析方法,首先分析频率相关参数输电线路和线路边界的频率特性;然后对特定边界(葛南直流线路边界)透反射系数频率特性的分析发现:边界对频率大于600 Hz的信号具有很强的衰减作用,而对区内直流滤波器调谐频率600 Hz,1 200 Hz,1 800 Hz处的信号具有反向全反射的特点;另外,考虑到直流线路的频率相关特性,线路保护判据的构建宜选用直流滤波器调谐频率段内的信号分量。
The current traveling wave protections for DC line are mostly unreliable and insensitive because of no considering the influence to transient component caused by the components on DC line. This paper comprehensive analysis the frequency characteristics of the DC line and the DC boundary. Then the analysis of the frequency char- acteristics of the refraction and the reflection showed that the DC boundary has a strong attenuation to the signal which frequency is greater than 600 Hz. While to the signal of the tuned frequency 600 Hz, 1 200 Hz, 1 800 Hz inside the DC line has the features of reverse total reflection. Besides, considering the frequency-dependent char- acteristics of the line, the construction of the DC line protection criterion should choose the signal components in the band of tuned frequency.
出处
《电力科学与工程》
2013年第6期35-40,46,共7页
Electric Power Science and Engineering
关键词
频率相关参数输电线路
线路边界
频率特性
transmission line with frequency-dependent parameters
DC boundary
frequency characteristics
