同步发电机定子绕组短路故障瞬态过程电磁转矩特性分析
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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 airgap 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 30 kVA 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.
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 airgap 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 30 kVA 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.
引文
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[4]马宏志,张志艳,张志新,等.双馈异步发电机定子匝间短路故障诊断研究[J].电机与控制学报,2011,15(11):60.
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[6]SIVAKUMAR N,PANDA S K,BHANGU B,et al.Hybrid model for wound-rotor synchronous generator to detect and diagnose turnto-turn short-circuit fault in stator winding[J].IEEE transactions on industry electronics,2015,62(3):1888.
[7]万书亭,李和明,许兆凤,等.定子绕组匝间短路对发电机定转子径向振动特性的影响[J].中国电机工程学报,2004,24(4):157.
[8]方红伟,夏长亮,修杰,等.定子绕组匝间短路时发电机电磁转矩分析[J].中国电机工程学报,2007,27(15):83.
[9]何玉灵,万书亭,唐贵基,等.定子匝间短路对发电机并联支路环流特性的影响[J].电机与控制学报,2013,17(3):1.
[10]赵洪森,戈宝军,陶大军,等.定子绕组匝间短路对发电机电磁转矩特性的影响[J].电工技术学报,2016,31(5):192.
[11]邱家俊.机电分析动力学[M].北京:科学技术出版社,1992.
[12]邱家俊,陈贯青,刘云川.大型水轮发电机组不对称运行时的参、强联合共振研究[J].黄淮学刊,1998,14(4):1.
[13]陶大军,戈宝军,董传友,等.发电机SFC起动强迫环流过程磁场特性[J].电机与控制学报,2014,18(1):26.
[2]胡敏强,屠黎明,林鹤云,等.水轮发电机定子绕组内部故障稳态电量仿真及其规律探讨[J].中国电机工程学报,1999,19(5):3.
[3]叶志军,游佰强,ROSENDAHL J,等.基于FLUX 2D的大型同步发电机在额定运行时定子绕组匝间短路故障特性研究[J].中国电机工程学报,2013,33(3):125.
[4]马宏志,张志艳,张志新,等.双馈异步发电机定子匝间短路故障诊断研究[J].电机与控制学报,2011,15(11):60.
[5]SIVAKUMAR N,PANDA S K,BHANGU B,et al.Dynamic Model of Brushless Synchronous Generator with Turn-to-turn Short Circuit Fault for Condition Monitoring[J].Proc.IEEE ECCE Asia,2013:258.
[6]SIVAKUMAR N,PANDA S K,BHANGU B,et al.Hybrid model for wound-rotor synchronous generator to detect and diagnose turnto-turn short-circuit fault in stator winding[J].IEEE transactions on industry electronics,2015,62(3):1888.
[7]万书亭,李和明,许兆凤,等.定子绕组匝间短路对发电机定转子径向振动特性的影响[J].中国电机工程学报,2004,24(4):157.
[8]方红伟,夏长亮,修杰,等.定子绕组匝间短路时发电机电磁转矩分析[J].中国电机工程学报,2007,27(15):83.
[9]何玉灵,万书亭,唐贵基,等.定子匝间短路对发电机并联支路环流特性的影响[J].电机与控制学报,2013,17(3):1.
[10]赵洪森,戈宝军,陶大军,等.定子绕组匝间短路对发电机电磁转矩特性的影响[J].电工技术学报,2016,31(5):192.
[11]邱家俊.机电分析动力学[M].北京:科学技术出版社,1992.
[12]邱家俊,陈贯青,刘云川.大型水轮发电机组不对称运行时的参、强联合共振研究[J].黄淮学刊,1998,14(4):1.
[13]陶大军,戈宝军,董传友,等.发电机SFC起动强迫环流过程磁场特性[J].电机与控制学报,2014,18(1):26.