同步发电机定子绕组匝间短路时转子动态电磁力计算  

Calculation of Rotor Dynamic Electromagnetic Force of Synchronous Generator under the Stator Winding Interturn Short Circuit Fault

作　　者：肖士勇 戈宝军[1] 陶大军[1] 刘智慧 Xiao Shiyong;Ge Baojun;Tao Dajun;Liu Zhihui(College of Electrical and Electronic Engineering Harbin University of Science and Technology,Harbin 150080,China;College of Rongcheng Harbin University of Science and Technology,Rongcheng 264300,China)

机构地区：[1]哈尔滨理工大学电气与电子工程学院,哈尔滨150080 [2]哈尔滨理工大学荣成学院,荣成264300

出　　处：《电工技术学报》2018年第13期2956-2962,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51407050)

摘　　要：为准确地分析定子绕组匝间短路后同步发电机转子铁心电磁力的分布特点和变化规律,建立了同步发电机内部短路场路耦合模型,并结合麦克斯韦应力法,对一台1 400 MW半速汽轮发电机转子齿顶和齿壁动态电磁力进行了计算。经分析得到:在短路环电流的影响下,转子齿顶和齿壁局部电磁力突增,且最大电磁力集中在磁极两侧边缘处和槽口位置。随着短路匝数的增加,齿顶和齿壁局部电磁力的最大值小幅增加。该文为全面了解匝间短路对同步发电机的威胁和转子结构的优化设计提供了相应的理论依据。In order to accurately analyze the distribution and variation of the electromagnetic force in the rotor of synchronous generators after the stator winding interturn fault,a field-circuit coupled model of synchronous generators with internal faults is built.A 1400 MW turbogenerator is taken as an example,and the dynamic electromagnetic force of the top and side walls of the rotor teeth is calculated by the Maxwell stress method.The calculation results show that,under the influence of the short-circuited loop current,the local electromagnetic force of the rotor tooth top and tooth side wall is sharply increased,and the maximum electromagnetic force is concentrated at both sides of the magnetic pole and the slot opening position.With the increase of the number of short-circuited coils,the maximum local electromagnetic force of the tooth top and the tooth side wall is increased slightly.The study in this paper provides the basis for comprehensive understanding the threat of the internal faults to synchronous generator and the optimization design of the rotor structure.

关 键 词：同步发电机 匝间短路 动态电磁力 场路耦合 麦克斯韦应力法 

分 类 号：TM341[电气工程—电机]