摘要
提出了两种用于汽轮发电机组扭振分析的轴系模型——模态舍项模型和质量集结模型。模态舍项模型是基于低阶模态在扭振中的主导作用从而对模态模型进行部分截取而建立的,其中模态量与实际量的联系是由左右特征向量子阵来描述的,考虑到某些研究中需运用低阶物理模型,本文又提出了一种简单、有效、可保证低阶频率的振型在降阶前后基本一致的质量集结模型,这种模型可与电力系统中其它元件的状态空间模型直接接口。仿真结果表明,这两种模型都有足够精度,而且可避免使用高阶模型时耗费机时和占用空间过多的缺点.
Two very simple, sufficiently accurate reduced-order shaft system models-Truncated Modal Model and Aggregated Mass Model-used in turbogenerator torsional oscillation analysis are presented in this paper. The first is developed by truncating the low-order modes concerned from modal model, of which, the relationships among modal and physical variables are described by the left or right eigenvector submatrice of the modal model. While the second is established by fitting the low- order mode shapes of the original. They can be implemented into the existing programs without difficulty and the fidelity of which can easily be adjusted by changing their orders. The validity of these models is well verified by simulation practice.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
1992年第4期75-82,共8页
Journal of Southeast University：Natural Science Edition
关键词
透平
发电机
轴
建模
扭振
turbines, generators, shafts, modelling/torsional oscillations
