摘要
基于暂态量的超高速输电线路保护方案动作时间短,能很好地满足特高压输电线路对保护速动性的要求,但它易受雷击干扰的影响,从而造成误动作。为了解决该问题,提出了一种基于数学形态学的特高压输电线路雷击干扰与故障识别的新方法。通过对电流暂态信号进行多尺度形态学分解,提取特定高、低频段上的谱能量,并用这两个谱能量的比值构成判据,实现雷击干扰与故障状态的识别,大量EMTP仿真试验表明了该方法的正确性。作为辅助判据,与线路的暂态保护结合,将有效提高特高压输电线路保护的可靠性。
The application of ultra-high-speed protection based on transient components well meets the requirements of the UHV transmission lines＂ protection due to its speedy operation. But it may real-operate in case that lightning strokes on transmission lines. In order to solve the problem, we proposed a new method to identify lightning disturbance for the UHV transmission lines based on mathematical morphology. The multi-scale morphology decomposition was used to extract the spectrum energy from the high and low frequency bands of the current model. The criterion, which is composed by the ration of spectrum energies of the two frequency bands, is to identify the lightning disturbance. EMTP simulation tests indicate that the transient method is correct. As an auxiliary criterion, combined with transient-based protection, it will enhance the reliability of the UHV transmission lines＇ protection effectively.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2009年第5期994-998,共5页
High Voltage Engineering
关键词
特高压
输电线路
多尺度形态分解
雷击干扰
谱能量
辅助判据
UHV
transmission lines
multi scale morphology decomposition
lightning disturbance
spectrum energies
auxiliary criterion
作者简介
赵军1983-，男研究方向电力系统继电保护E—mail：zhaojun2008@163．com
吕艳萍1955-，女，教授主要从事电力系统继电保护方面的教学与研究工作
