并联电抗器对模型识别纵联保护的影响分析  

Influence of shunt reactors on model recognition pilot protection

作　　者：杨铖[1] 索南加乐[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》2011年第3期23-28,共6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(20070698057);国家重点基础研究发展计划(2009CB219704)~~

摘　　要：详细分析了两端带并联电抗器输电线路的内外部故障特征,指出线路内部故障可等效为电感模型,但外部故障不再满足电容模型。通过建立包含电抗器参数的故障模型,在理论上可以精确等效外部故障,但难以在目前的实际装置中应用。进一步理论分析指出,用电容模型等效两端带并联电抗器线路的外部故障时,模型误差主要由电压中的高频分量造成,且频率越高、能量越大,模型误差也越大。基于原始的电容模型、电感模型,采用高可靠系数的模型识别保护判据,可以有效降低外部故障电容模型不准的影响,且大量ATP仿真实验表明,该判据的灵敏度仍然很高,能够在15 ms内切除各种区内故障。The features of internal and external faults of the transmission line with shunt reactors at two terminals are analyzed and it is indicated that,the internal fault is equal to the inductor model while the external fault is not equal to the capacitor model.The fault model including the parameters of shunt reactors is established,which is accurately equal to external fault in principle,but hardly applied to current real devices.Further theoretic analysis indicates that,when the capacitor model is equivalent to the external fault of transmission line with shunt reactors,the model error is induced by the high-frequency components of voltage.The higher the frequency is or the bigger the energy is,the larger the model error is.A model recognition protection criterion with high reliability factor based on original inductor and capacitor models is introduced to effectively lower the error.Results of ATP simulations demonstrate that,the sensitivity of introduced criterion is high enough to trip within 15 ms for different internal faults.

关 键 词：故障分量 模型识别 纵联保护 参数识别 

分 类 号：TM773[电气工程—电力系统及自动化]