摘要
为了研究定子内部短路故障后瞬态过程中电磁转矩的变化特性,基于动力学虚位移原理,对同步发电机定子绕组内部匝间短路故障前以及故障后瞬态过程的电磁转矩进行了理论分析,研究了在振动偏心影响下同步发电机定子内部短路故障前后气隙磁动势的变化特征,并得到了故障发生后瞬态过程中各频率电磁转矩分量的幅值和频率特性。同时建立了动模实验模型,实验测量了一台功率为30kVA的同步发电机不同短路故障下的电磁转矩,并对其进行频谱分析,实验分析结果验证了理论推导的准确性。该结果为基于电磁转矩的定子内部故障诊断技术提供了理论基础。
In order to study the change characteristics of electromagnetic torque in the transient process of stator internal short circuit fault,based on virtual work principle in dynamic,the electromagnetic torque of transient process after stator winding inter-turn short circuit fault in synchronous generator is analyzed theoretically.The air-gap magneto-motive forces variation characteristics of the generator before and after short circuit fault in stator winding are studied,while considering the impact of vibration eccentricity.The magnitudes and frequency variation characteristics of the electromagnetic torque component of each frequency after short circuit fault are obtained.Then a dynamic simulation experiment model is built.The electromagnetic torque data of the 30kVA synchronous generator with different stator winding inter-turn short circuit faults is tested.After that,these data are analyzed with Discrete Fast Fourier Transform technique,and the test results verify the theoretical analysis conclusion.The research results provide a theoretical basis for the internal fault diagnosis technology based on the electromagnetic torque.
作者
陈超
赵洪森
陈小元
戈宝军
CHEN Chao;ZHAO Hong-sen;CHEN Xiao-yuan;GE Bao-jun(College of Engineering,Lishui University,Lishui 323000,China;School of Electrical and Electronic Engineering,Harbin University of Science and Technology,Harbin 150080,China)
出处
《哈尔滨理工大学学报》
CAS
北大核心
2019年第3期59-65,共7页
Journal of Harbin University of Science and Technology
基金
国家自然科学基金(51207068)
国家科技重大专项专题(2009ZX06004-013-04-01)
关键词
同步发电机
电磁转矩
短路故障
气隙磁势
synchronous generator
electromagnetic torque
short circuit fault
air-gap magneto-motive forces
