电力系统保护与控制2011，Vol.39Issue(19)：8-16,9.
参数识别纵联差动保护应用中输电线路模型适用频带研究
Research of suitable frequency band of transmission line model applied to pilot differential protection based on parameter identification
摘要
Abstract
In the research of relay protection, transmission lines are usually imitated with different mathematical models. But the mathematical model corresponds with actual physical model approximately only when it is applied in the special frequency band. So it has to consider the suitable frequency band when implementing the relay protection. This paper raises the definition of suitable frequency band of line model applied to pilot differential protection based on parameter identification. And it researches the suitable frequency band of transmission line Π model. It appears that the suitable frequency band becomes narrower with the increase of the length of transmission line, and is irrelevant with the system impedance. Finally, simulations by ATP basically establish the suitable frequency bands of Π model for the transmission lines of different length, provides the criteria for the design of digital filters of pilot differential protection based on parameter identification. And it verifies that the suitable frequency bands have decisive effect on the selectivity and rapidity of relay protection.关键词
参数识别/纵联差动保护/Π模型/模型适用频带/端口阻抗/相频特性Key words
parameter identification/ pilot differential protection/ Π model/ suitable frequency band of model/ port impedance/phase-frequency characteristic分类
信息技术与安全科学引用本文复制引用
康小宁,吴招座,索南加乐,游昊,贾伟,刘仁寰,何方明..参数识别纵联差动保护应用中输电线路模型适用频带研究[J].电力系统保护与控制,2011,39(19):8-16,9.基金项目
国家自然科学基金项目(50877061,51037005) （50877061,51037005）
国家“973计划”项目(2009CB219704) （2009CB219704）
