【作者】 黄学良； 胡敏强；

【Author】 HUANG Xue-liang, HU Min-qiang (Department of Southeast University, Nanjing 210096, China)

【机构】 东南大学电气工程系；

【摘要】 冲击负荷下发电机的端部电磁场是瞬态涡流场,不具有时谐场的特性。在给出瞬态涡流场边值问题的基础上,用加权余量法对瞬态涡流场边值问题在空间上作了有限元离散,并综合考虑计算精度和计算稳定性两方面因素,运用Crank-Nicolson方法得到了时间差分的迭代格式。以一台320 MW汽轮发电机组为实例,对冲击负荷情况下的发电机瞬态电磁场分布、绕组电动力密度分布作了分析,从而为进一步研究发电机在冲击负荷下的端部绕组电磁振动提供了依据。更多还原

【Abstract】 In this paper, the boundary problem (BVP) of 3-D transient eddy current field in the end region in the case that the generator is affected by impact load is specified. Besides, the way to implement the discrete method in both time domain and space domain during the solution of the problem is investigated. The Crank-Nicolson scheme is utilized to attain the iterative format of time differential, after taking factors that can ensure both computation precision and stability into account. In this paper, the magnetic distribution in the end region of turbo generator in the case that the generator is affected by impact load is specified. As a result, it provides foundation for further study of electromagnetic force and electromagnetic vibration in the end region of turbo generator.更多还原