摘要
目前在高压电网中广泛使用的主保护是基于高频通道的纵联保护,而后备保护的信息则来源于单端信息的测量。文中分析了纵联保护和传统后备保护存在的问题,并结合变电站铺设光纤的现实条件,提出了一种新型的基于光纤环网通信,实现电气信息共享来进行故障定位的分层式区域保护系统。该系统可与传统的主保护和后备保护协同工作,进一步加强电网的第一道防线。详细介绍了区域保护系统的层次结构以及工作过程,阐述了用于故障定位的零、负序方向元件的原理,以及基于序分量和阻抗的综合选相元件的原理。EMTP仿真了各种故障,特别是区内外复杂故障情况下系统的动作行为,仿真结果证明了此系统的正确性。
Currently, the main protection used in the high-voltage power system is mainly the pilot protection based on power line carrier communication while the backup protection makes decisions with local information. This paper analyzes the problems exiting in the pilot protection and the traditional backup protection. Considering the advantages of fiber optic communication, a new hierarchical region protective system is proposed, which locates a fault by sharing electric information transmitted through optic fiber. By working in collaboration with the pilot protection and the backup protection, it can further strengthen the first line of defense of the power system. A detailed description is made of the structure and the work process of the region protective system. The principles of the zero and negative sequence directional protection and synthetic fault phase selection are dealt with. Many types of fault have been simulated with EMTP, especially the complex faults inside and outside the region, with the correctness of the region protective system verified by the results.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第3期72-78,共7页
Automation of Electric Power Systems
关键词
电力系统
分层式区域保护系统
综合决策机制
零负序方向元件
综合选相元件
power systems
hierarchical region protective system
mechanism of synthetic decision
zero and negative sequence directional protection
synthetic fault phase selection
