大型汽轮发电机非全相运行磁密分析
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摘 要：针对非全相运行工况，以一台1 407 MVA核电汽轮发电机为例，建立了单机无穷大系统动态分析的场-路-网耦合时步有限元模型，分析计算了发电机额定并网运行时变压器高压侧一相断开和两相断开的非全相运行工况下，汽轮发电机定转子齿部磁密分布情况及其规律，并将其与正常负载运行时汽轮发电机定转子齿部磁密分布情况及其规律作对比。最后，提取气隙磁场密度并分析其变化规律，结果表明非全相运行后，并且除基波最大值下降外其他各次谐波最大值都增大，气隙磁密畸变较为严重。该研究为大型汽轮发电机设计与制造、安装和维修、运行与操作等工程实践提供基础理论参考。
关键词：非全相运行;时步有限元模型;场-路-网耦合;定转子磁密;气隙磁场密度
DOI：10.15938/j.jhust.2019.04.001
中图分类号： TM311
文献标志码： A
文章编号： 1007-2683（2019）04-0001-07
Abstract：For the open-phase operation condition operation， taking a 1，407 MW nuclear steam turbine as an example ，a field-circuit-network coupled time-stepping finite element model for a one machine and infinite bus system was set up. The distribution of magnetic field density of the stator and rotor of the turbine generator and its rule were analyzed and calculated under the open-phase operation condition， in which one phase or two phases are open on the HV side of the transformer when the generator is running at the rated operation condition. Then， the magnetic field density distribution of the stator and rotor at the rated load condition for the generator was calculated ，which is compared with the results of the open-phase operation condition. Finally， to extract the air-gap magnetic field density and analyse its change rule， the maximum of the fundamental wave drop and the maximum value of...
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