大型汽轮发电机非全相运行磁密分析.docx
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1、大型汽轮发电机非全相运行磁密分析戈宝军姜超陶大军赵洪森陈修材鲁文丽励磁调节系统转速控制系统SM汽轮发电机非全相运行T故障点用 LiI IWV调节控制系统I WVR2l2输变电系统无穷大电网/ / /图1汽轮发电机非全相运行场-路-网耦合仿真系统结构框图Fig. 1 Structure diagram of field-circuit-networkcoupled simulation system for turbo generatorunder non-full operation condition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
2、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。Key: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D0I: 10. 15938/j. jhust. 2019. 04. 001:
3、TM311文献标志码:A:1007-2683 (2019) 04-0001-07Abstract: For the open-phase operation condition operation, taking a1, 407 MW nuclear steam turbine as an example , a field-circuit-network coupled time-stepping finite element model for a one machineand infinite bus system was set up. The distribution of magn
4、eticfield density of the stator and rotor of the turbine generator andits rule were analyzed and calculated under the open-phase operationcondition, in which one phase or two phases are open on the HV sideof the transformer when the generator is running at the ratedoperation condition. Then, the mag
5、netic field density distributionof the stator and rotor at the rated load condition for the generatorwas calculated , which is compared with the results of the open-phaseoperation condition. Finally, to extract the air-gap magnetic fielddensity and analyse its change rule, the maximum of the fundame
6、ntalwave drop and the maximum value of other harmonics are increased ,and the air gap flux density distortion is serious. This studyprovides the basic theoretical reference for the design andmanufacture, installation and maintenance, operation and operationof the large turbine generator.Keywords: op
7、en-phase operation;fie1d-circuit-network coupled;finiteelement calculation model;magnetic field density of the stator tooth;magnetic field density of the air-gap0引言大型核霓汽轮发电机的非全相运行不仅使定转子各部分受到极大电磁转矩冲击,还对电网造成较大的负面影响。同时,电机齿部磁密畸变不仅导致发电机的涡流和涡流损耗也随之增大,其必然导致发电机各个部件的温升相应增大,这样不但会使发电机的效率降低,同时也使电机运行的安全性和可靠性大大下降
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