摘要
单极金属回线方式是直流输电系统中最常见的接线方式之一。首先从理论上分析了直流输电系统单极金属回线运行方式下发生线路接地故障时各特征量的变化情况,并借助RTDS实时仿真系统进行了验证;接着以此为依据,以天广、高肇、兴安等由德国Siemens公司设计的直流保护系统为例,介绍了针对这一故障设置的相关保护;然后结合运行实例和仿真,分析了这些保护存在的缺陷如线路后备保护配合不当和无法快速、准确地检测金属回线线路故障等,最后还提出了一些改进建议,并讨论了各种方案的优缺点。这些分析研究,不但有助于提高直流输电系统的运行维护水平,而且对优化直流保护、提高直流输电系统运行的可靠性有很高的参考价值。
Metallic return operation is one of the most common configuration in HVDC transmission system. In this paper, the characteristic of the main parameters during the process of the line fault in metallic return operation is discussed and confirmed on RTDS first; then, based on the DC protection system of Tian-Guang, Gao-Zhao and Xing-An HVDC transmission projects, the correlative protection is introduced. Combined with example and simulation result, the defects, such as the cooperation of backup protection is not appropriate and the metallic line fault can not be detected quickly and exactly, are analyzed. At last, some useful suggestions are proposed.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2009年第20期133-138,共6页
Power System Protection and Control
