核电汽轮发电机定子内部短路故障对转子涡流损耗影响  

Influence of stator internal short-circuit fault on rotor eddy current losses in nuclear power turbo-generator

作　　者：赵洪森[1,2] 戈宝军 陶大军[1] 韩继超[1] 王立坤[1] ZHAO Hong-sen;GE Bao-jun;TAO Da-jun;HAN Ji-chao;WANG Li-kun(School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Engineering,Lishui University,Lishui 323000,China)

机构地区：[1]哈尔滨理工大学电气工程学院,黑龙江哈尔滨150080 [2]丽水学院工学院,浙江丽水323000

出　　处：《电机与控制学报》2018年第8期17-25,共9页Electric Machines and Control

基　　金：国家自然科学基金(51407050);国家科技支撑计划项目(2011BAF03B02);黑龙江省青年科学基金(QC2016066);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2017080);黑龙江省博士后基金(LBH-Z17040);黑龙江省博士后基金(LBH-Z15033);中国博士后科学基金面上项目(2017M620109)

摘　　要：针对核电汽轮发电机定子内部短路故障后转子表面涡流损耗的分布问题,结合场路耦合数学模型和涡流损耗计算方法对该问题进行了详细的研究。首先建立了核电汽轮发电机场-路耦合时步有限元数学模型,计算发电机故障前后影响转子表面损耗的气隙磁密,并采用快速傅里叶法对气隙磁密进行谐波分析,进一步研究了故障后各次谐波的瞬态变化以及不同故障工况下气隙磁密各次谐波幅值平均值的变化特性。其次,计算并分析核电汽轮发电机定子绕组短路故障前后,转子表面小齿和槽楔的瞬态涡流损耗与一个周期的平均涡流损耗,并进一步揭示了不同故障工况下,转子表面小齿,大齿和槽楔平均涡流损耗的分布规律,得到一些有意义的结论,为转子温升的计算提供了理论基础。Aim at the distribution problem of the eddy current losses on rotor surface in nuclear power turbo-generator after stator internal short-circuit fault,the problem was studied in detail by combining the field-circuit coupled mathematical model and eddy current losses calculation method.First,the mathematical model of field-circuit coupled finite element was established.The air-gap flux density was calculated before and after turbo-generator fault,which affects eddy current losses of the rotor surface.The harmonic analysis for air-gap flux density was conducted by FFT approach.Furthermore,the transient change of harmonics after stator short-circuit fault and the variation characteristics of average values of different harmonic amplitudes under different fault conditions are researched.Then,the transient losses and average losses of small teeth and rotor wedge on the rotor surface during a period were calculated and analyzed before and after short-circuit fault in the stator winding of nuclear power turbo-generator.The distribution laws of average eddy current losses of big teeth,small teeth,and rotor wedge were revealed under different fault conditions.Some significant conclusions are gained,which provides a theoretical basis for calculating the temperature rise of the rotor.

关 键 词：核电汽轮发电机 短路故障 气隙磁密 涡流损耗 场路耦合 

分 类 号：TM341[电气工程—电机]