摘要
远距离、大容量、交直流混合运行电网中,交直流系统间的相互影响非常复杂。文中以南方电网交直流混联系统运行实例为基础,讨论了直流系统控制功能在交流系统故障期间的作用,分析了交流系统故障时可能误动的相关直流保护监视功能及换流变和站用变保护等,并给出了相应的改进建议。这不仅有助于提高直流输电系统的运行维护水平,确保交直流系统的安全稳定运行,还为未来直流输电系统的设计、交直流输电系统控制保护功能的合理配合等提供了有益的参考。
Interaction of AC and DC system in long distance, high-capacity, ultra-high voltage AC/DC hybrid system is very complicated. Based on the analysis of operational examples in China Southern Power Grid, the effects of DC control system during AC system fault are discussed first. Then some functions that maybe misoperate during the AC system fault, including the DC protection and monitoring function, converter transformers protection and auxiliary transformers, are analyzed. The improvement suggestions are given, which are not only valuable for improving the operation and maintenance capability and insuring the safe and reliable operation of HVDC system, but also provide useful reference to the design of HVDC transmission oroiects and the coooeration of AC/DC system in China in the future.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第1期93-98,共6页
Automation of Electric Power Systems
关键词
交直流混联系统
交流故障
直流保护监视功能
换流变保护
站用电系统
AC/DC hybrid system
AC system fault
DC protection and monitoring function
converter transformer protection
auxiliary power system
