基于模量的线路模型识别纵联保护新原理  

Model recognition longitudinal protection based on modules for transmission lines

作　　者：索南加乐[1] 杨铖[1] 邵文权[1] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力自动化设备》2009年第10期21-24,68,共5页Electric Power Automation Equipment

基　　金：国家自然科学基金项目(50677051;50877061);教育部博士点基金项目(20070698057);国家重点基础研究发展计划项目(2009CB219704)~~

摘　　要：详细分析了输电线路内、外部故障时故障分量网络的特征,提出可以将线路外部故障等效为电容电路模型,内部故障等效为电感电路模型。基于时域中的短数据窗,利用参数识别的方法,分别计算线路的真实模型与上述2种模型的误差,若电容模型误差小,则判为外部故障;若电感模型误差小,则判为内部故障。对于实际三相线路,为降低相间电磁耦合对模型识别效果的影响,则同时采用线模量和零模量做线路模型识别,从而判断故障。理论分析表明,新方法基于故障分量原理,不受负荷状态和过渡电阻影响,无需补偿电容电流,在时域中进行短数据窗的判据计算,不用滤波提取相量,受暂态分量影响很小。EMTP仿真试验进一步证明了新原理动作可靠、迅速。By the fault analysis of transmission line,the capacitance model for external fault and the inductance model for internal fault are established. Based on the parameter recognition method using short data- window on time domain,the error between actual transmission line model and capacitance or inductance model is calculated. If the error of inductance model is larger than that of capacitance model,it is the internal fault;otherwise,it is the external fault. In practice,modules are used in the model recognition to reduce the interphase electromagnetic coupling disturbance. By computing the model error,the true state of transmission lines is obtained. Theoretical analysis shows that,the proposed method based on fault components is immune to load state and transition resistance,the capacitance current compensation and the phasor extraction are unnecessary,with less influence of transient components. EMTP simulation demonstrates its fast operation speed and good performance.

关 键 词：故障分量 模型识别 差动保护 参数识别 短数据窗 

分 类 号：TM773[电气工程—电力系统及自动化]