转子磁路结构对汽轮发电机励磁电流和磁场分布的影响  

Influence of rotor magnetic circuit structure on excitation current and magnetic field distribution of turbogenerator

作　　者：梁艳萍[1] 陈建清[1] 黄浩[2] 

机构地区：[1]哈尔滨理工大学电气与电子工程学院,黑龙江哈尔滨150080 [2]哈尔滨电机厂有限责任公司,黑龙江哈尔滨150040

出　　处：《电机与控制学报》2011年第4期13-17,共5页Electric Machines and Control

基　　金："十一五"国家科技支撑计划重大项目(2007BAA05B06)

摘　　要：建立1 400MW核电半速汽轮发电机二维瞬态场有限元模型,提出用等效负载阻抗法来模拟发电机的额定运行状态,从而避免了功率因数的迭代。在验证该方法正确性和可行性的前提下,针对大型核电半速汽轮发电机转子通常采用偏槽结构来改善电机性能的设计思想,采用该方法计算得到了汽轮发电机不同偏槽结构下的励磁电流,并且定量分析不同偏槽结构下,汽轮发电机额定运行时高磁密区域关键点的磁密变化情况,结果表明转子偏槽结构会对汽轮发电机励磁电流产生较大影响,然而合理的偏置角度会改善高磁密区域磁场分布,避免局部过热,所得结论为大型核电半速汽轮发电机的转子磁路结构设计提供理论依据。A 2-D transient finite element model of 1400MW nuclear half-speed turbogenerator was established in this paper.The rated operation condition of the generator was simulated using equivalent load impedance method which can avoid the iteration of the power factor.Aiming at the fact that the rotor of large-capacity nuclear half-speed turbogenerator was usually designed with bias slot to improve generator performance,the excitation current of the nuclear half-speed turbine-generator with different bias slot was calculated depending on the method＇s correctness.At the same time,the flux density change at critical points of high flux density region was quantitative calculated.The results showed that the bias slot structure of rotor will greatly influence the excitation current and reasonable bias angles will improve magnetic field distribution in high flux density region to avoid local overheating.The conclusion could provide theoretical basis for the rotor magnetic circuit structure design of large-capacity nuclear half-speed turbogenerator.

关 键 词：核电半速汽轮发电机 等效负载阻抗法 偏槽 励磁电流 磁密 

分 类 号：TM311[电气工程—电机]