基于模型识别的输电线路纵联保护新原理  

New Type of Transmission Line Pilot Protection Based on Model Identification

作　　者：索南加乐[1] 杨铖[1] 杨忠礼[2] 沈黎明[2] 焦在滨[1] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]河南省电力公司新乡供电公司,河南省新乡市453002

出　　处：《电力系统自动化》2008年第24期30-34,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50677051);国家科技攻关计划项目(2005BA208C);高等学校博士学科专项科研基金资助项目(20070698057)~~

摘　　要：提出了一种基于模型识别的线路纵联保护新原理,将外部故障状态等效为电容电路模型,内部故障状态等效为电感电路模型。内部故障时,电容模型误差大,识别出的电容参数所对应的阻抗ZC等效于系统阻抗,数值在100Ω以下;外部故障时,电感模型误差大,ZC等效于线路容抗,数值在500Ω以上。通过比较模型误差和识别容抗ZC的大小,即可区分线路内外部故障。理论分析和EMTP仿真实验表明,新原理无需补偿电容电流,原理上不受暂态分量的影响,具有很好的抗过渡电阻能力,能够可靠地快速动作。By developing a capacitance model for the external fault state and an inductance model for the internal fault state, a new type of transmission line pilot protection based on model identification is proposed. When an internal fault occurs, the error of the capacitance model is big, and the corresponding impedance Zc of the capacitance identified during the process of model identification is equivalent to the system-impedance usually less than 100 fl. When an external fault occurs, the error of the inductance model is big, and Zc is equivalent to the capacitance impedance of the transmission lines usually above 500 Ω. By computing the model errors and Zc, it will be possible to distinguish between the internal and external faults. Theoretical analysis and simulation by EMTP show that with this novel protection principle, it is unnecessary to compensate for the distribution capacitance current and fast operation speed and good performance in resisting transition resistance and transient components can be attained.

关 键 词：纵联保护 模型识别 参数识别 最小二乘法 

分 类 号：TM771[电气工程—电力系统及自动化] TM773