核电汽轮发电机负序运行转子槽楔涡流损耗研究  

Study of Rotor Slot Wedge Eddy Current Loss of Nuclear Power Turbo-generator under Negative Sequence Operation

作　　者：戈宝军[1] 周家驹 王立坤[1,2,3] 陶大军 李梦乔[4] 韩继超 GE Bao-jun;ZHOU Jia-ju;WANG Li-kun;TAO Da-jun;LI Meng-qiao;HAN Ji-chao(School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China;School of Electrical Engineering&Automation,Harbin Institute of Technology,Harbin 150001,China;Harbin Electric Machinery Co.,Ltd.,Harbin 150040,China;China Electric Power Planning and Engineering Association,Beijing 100120,China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080 [2]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001 [3]哈尔滨电机厂有限责任公司,黑龙江哈尔滨150040 [4]中国电力规划设计协会,北京100120

出　　处：《哈尔滨理工大学学报》2018年第5期54-61,共8页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51777048)；中国博士后科学基金特别项目(2018T110270)；中国博士后科学基金面上项目(2017M620109)；黑龙江省博士后基金(LBH-Z17041)；国家重大科技专项(2009ZX06004-013-04-01)；黑龙江省青年科学基金(QC2016066).

摘　　要：为了研究发电机不同工况下转子槽楔涡流损耗,以1407MVA大型核用半速汽轮发电机为例,通过建立该发电机二维电磁场数学模型,基于时步有限元法计算发电机由负载不对称引起稳态负序运行时转子槽楔上感生的涡流损耗。建立动态分析的场—路耦合时步有限元模型,分别计算当发电机外部发生单相短路、相间短路、两相接地短路故障后瞬间和故障稳定后的转子槽楔涡流损耗,得到不同外部短路故障下转子不同位置的槽楔暂态和稳态涡流损耗分布。对比研究了发电机额定运行和空载运行时外部短路故障后槽楔涡流损耗的变化规律。分析结果表明外部短路故障后,负序电流会使发电机转子槽楔产生涡流损耗,威胁着发电机的安全运行,其中单相短路故障影响最为严重。In order to study the generator rotor slot wedge eddy current loss under different conditions.The 1407MVA turbo generator at half speed is researched as an example.Mathematical model is established in 2D electromagnetic field.Then the eddy-current losses of the rotor slot wedge is calculated according to time step finite element method,which is under the circumstance of generator steady negative sequence operation leaded by the asymmetrical load.The field-circuit coupled time-stepping finite element model is established for dynamic analysis.In an instant and stability of the single phase short-circuit fault,two phases to ground short-circuit fault and the interphase short-circuit fault,the eddy-current losses of the rotor slot wedge is calculated.Then the distribution of eddy-current loss in transient and steady state of the different rotor slot wedge is revealed.The changing rule of eddy-current loss of the rotor slot wedge when external circuit happens in rated and no-load operation condition.The analysis result shows that after external circuit,the eddy-current losses are induced by the negative-sequence current,which has great influence on generator steady operation.The most serious impact happens in the single phase short-circuit fault.

关 键 词：汽轮发电机 稳态负序 外部短路故障 场-路耦合 涡流损耗 

分 类 号：TM311[电气工程—电机]