摘要
在对同步发电机定子绕组匝间短路故障负序电流分量产生机理进行分析的基础上,提出了以负序电流作为故障特征量,对同步发电机定子内部短路故障进行监测和诊断的方法。基于电路与电磁场有限元理论,建立同步发电机场路耦合数学模型,对半载运行下的同步发电机发生定子绕组匝间短路故障进行仿真,计算出故障发生前后三相电流相角差与幅值以及负序电流分量,并通过一台功率为24 kW的同步发电机实验数据验证了模型的精度与理论分析的合理性。同时,仿真分析了同一支路短路故障与不同支路短路故障等情况下对负序电流大小的影响,该结果对同步发电机定子绕组匝间短路故障的监测与诊断具有理论意义。
On the basis of negative sequence current generation mechanism analysis of synchronous generator stator winding inter-turns short circuit,the method of detecting and diagnosing synchronous generator stator winding inter-turns short circuit is proposed,which uses the negative sequence current as fault signature.A field-circuit coupled mathematical model of synchronous generator is built,based on the field-circuit coupled principle.Firstly,stator winding inter-turns short circuit happened in synchronous generator with half load is simulated.And then three-phase current phase difference,amplitude and negative sequence current component before and after fault is calculated according to the model.The accuracy of model and rationality of theoretical analysis is demonstrated by the use of experimental data coming from 24 kW synchronous.Meanwhile,the short circuit fault with the same branch and different branch impact on the negative sequence current is also simulated and analyzed.The results have some significance for synchronous generator stator winding inter-turns circuit fault monitoring and diagnosis.
出处
《哈尔滨理工大学学报》
CAS
北大核心
2018年第1期99-104,共6页
Journal of Harbin University of Science and Technology
基金
国家自然科学基金(51407050)
国家科技重大专项专题(2009ZX06004-013-04-01)
黑龙江省博士后基金(LBH-Z15033)
黑龙江省青年科学基金(QC2016066)
关键词
负序电流
定子短路故障
场路耦合
同步发电机
故障诊断
sequence current
stator short circuit fault
field-circuit coupled
synchronous generator
fault diagnosis
作者简介
赵洪森（1987-）,男,博士研究生;;戈宝军（I960-）,男,教授,博士研究生导师.;通信作者：陶大军（1982-）,男，副教授,E-mail：tao.dj@163.com.
