基于形态梯度的输电线电流行波比较式超高速保护  

Ultra-High-Speed Protection by Traveling Wave Current Polarity Comparison Based on Morphological Gradient

作　　者：程临燕[1] 段建东[1] 张保会[1] 李鹏[1] 罗四倍[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049

出　　处：《西安交通大学学报》2007年第4期484-488,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助重大项目(50277027)

摘　　要：将形态学的概念引入到电流行波比较式保护原理中,提出了基于形态学梯度变换的超高速电流行波极性比较式保护算法.算法具有运算量小、计算速度快的优点,并且由Clark变换产生1、2两种线模量,取形态学梯度变换后极大值较大的模量进行极性比较,因此对于任何一种故障类型都有较高的灵敏度,不存在故障类型引起的动作死区.ATP仿真测试表明,该算法可以用来实现超高速保护,基本上能够正确判别区内外故障,适应不同位置、不同过渡电阻、不同初始角及不同类型的故障情形.此外,还提出了电流行波相似度比较式线路保护方案,此方案不依赖于两端某一点的极性来判断区内外故障,而是通过比较线路两端一段时间内电流的相似度来区分区内外故障,因此可以明显提高判别故障位置的可靠性.Introducing the concept of morphology into the ultra-high-speed protection by traveling wave current polarity comparison, a highly efficient algorithm based on the morphological gradient （MG） is proposed. Undergoing the MG transform, the aerial mode with larger maximum is chosen to ensure the sensitivity for any fault type without dead zone. The ATP simulations show that the scheme for ultra-high-speed protection enables to correctly distinguish the internal and external faults, and is insensitive to fault locations, fault path resistances, fault inception angles and fault types. Furthermore, the protection scheme by traveling wave current similitude degree comparison, which is independent on the polarity of certain points of two ends, is presented to improve the discrimination reliability.

关 键 词：超高速保护 行波 极性比较 相似度 形态梯度 

分 类 号：TM732[电气工程—电力系统及自动化] F123.9[经济管理—世界经济]