中国电机工程学报Issue(28)：121-129,9.
基于电流行波固有频率的输电线路纵联保护方法
A Novel Pilot Protection for Transmission Lines Based on Natural Frequencies of Current
摘要
Abstract
To analyze the distribution of blind spot for differential protection based on natural frequency, solve the protection problems of internal fault at blind spot and improve the protection reliability and rapidity, a pilot protection for transmission lines based on natural frequencies of current was proposed. The spectrum characteristic of fault currents was analyzed and the natural frequencies were extracted by multiple signal classification algorithm. The difference between the dominant natural frequencies at two ends of a transmission line was used as the primary criterion to discriminate the internal faults and external faults. For the blind zone issue of the primary criterion, the distribution of the blind spot was analyzed under different system impedances. On this basis, the distinct difference of the secondary natural frequency under the internal faults and external faults was utilized as the secondary criterion to discriminate the internal faults at blind spot and the external faults. The proposed method only uses the current and possesses reliable performance, sensitive operation and strong adaptation. The simulation results in PSCAD/EMTDC and Matlab analysis validate the effectiveness of the proposed method.关键词
输电线路/纵联保护/固有频率/保护盲点/系统阻抗Key words
transmission lines/pilot protection/natural frequency/protection blind spot/system impedance分类
信息技术与安全科学引用本文复制引用
李小鹏,何正友,陈双,林圣..基于电流行波固有频率的输电线路纵联保护方法[J].中国电机工程学报,2013,(28):121-129,9.基金项目
国家高技术研究发展计划项目(863项目)(2012AA 050208)。Project Supported by National High-tech R&D Program(863 Program)(2012AA050208) （863项目）
