摘要
针对汽轮发动机励磁绕组匝间短路会导致机组的振动加剧的现象,建立了油膜力和电磁力耦合的发电机组非线性振动响应求解模型及动态稳定性分析方法。模型中发展了一种改进打靶法的不平衡电磁力激励的滑动轴承支承的汽轮机转子系统周期解计算方法,并提出了考察不平衡激励周期解稳定程度的系统阻尼指标。通过对某型300 MW机组受非线性油膜力和电磁力耦合下的振动特性计算,分析了一类故障模式下的振动响应特性及其失稳程度。研究结果表明,在汽轮发动机励磁绕组匝间短路可能导致激发接近于系统一阶临界转速的低频涡动失稳现象;这将为由振动检测直接预知励磁绕组匝间短路故障提供技术支持和理论基础。
To account for intensified vibration due to winding inter-turn short circuit of the turbine generator rotor, the coupled nonlinear dynamic model of oil film force and electromagnetic force was established, and the dynamic stability analysis method was proposed. An improved shooting method for solving the cycle solution of the unbalanced electromagnetic force bearing-rotor system was developed;and the system damping criterion in examining system stability margin was presented. The calculation on the nonlinear vibration for the 300 MW turbine generator was finished, and the vibration response characteristics and instability degree in a typical fault mode of winding inter-turn short circuit were obtained. The results indicated that the winding inter-turn short circuit fault might lead to the low frequency instability phenomenon, and the frequency was close to the first critical speed of the system. The results will provide technical support and theoretical basis for direct prediction of the winding inter-turn short-circuit fault via vibration detection.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第15期2406-2413,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(51205314)
陕西省自然科学基金项目(2014JQ7252)~~
关键词
非线性振动
匝间短路
电磁力
油膜力
轴系稳定性
nonlinear vibration
winding inter-turn short-circuit fault
electromagnetic force
oil film force
rotor system stability
