汽轮发电机转子铁心电导率对失磁异步运行的影响  

Influence of rotor core conductivity on the asynchronous operation of turbogenerator during loss of excitation

作　　者：吴国栋 许国瑞[1] 康锦萍[1] 刘晓芳[1] WU Guodong;XU Guorui;KANG Jinping;LIU Xiaofang(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《大电机技术》2018年第6期47-52,共6页Large Electric Machine and Hydraulic Turbine

基　　金：国家自然科学基金(51507059和51477049);中央高校基本科研业务费专项资金资助项目2018MS010

摘　　要：由于汽轮发电机转子高速旋转,其转子通常采用整块实心钢构成。当发电机失磁异步运行时,转子铁心涡流产生的异步转矩对其动态运行具有重要影响,同时转子损耗及发热也会限制汽轮发电机的运行极限。为了研究转子铁心对汽轮发电机失磁异步运行的影响,本文采用时步有限元法计算了失磁异步运行过程中,不同转子铁心电导率下发电机转速的波动及损耗的大小,获得了不同转子铁心电导率下的损耗分布以及转子铁心典型位置的磁密变化。研究结果可为如何提高汽轮发电机异步运行能力提供理论依据。The rotor of turbogenerator is made of solid steel,for its high speed rotation.When the generator is in asynchronous operation,the asynchronous torque generated by the rotor core eddy current has an important impact on its dynamic operation,while the rotor loss and heat will also restrict the operating limit of the generator.In order to study the influence of the rotor core on the asynchronous operation of the turbogenerator,the time-stepping finite element method is used to calculate the fluctuation of the generator rotation speed and the loss of the generator under different rotor core conductivities.The loss distribution under different rotor core conductivity and the magnetic density variation of the typical position of the rotor core were obtained.The results provide theoretical basis for improving the asynchronous operating ability of turbogenerator.

关 键 词：汽轮发电机 实心钢 动态响应 损耗 激磁损耗 

分 类 号：TM311[电气工程—电机]