汽轮发电机快关汽门大扰动过程中转子各部分阻尼强弱对比  

Comparison of rotor damping strength of turbine generator during large disturbance caused by fast valve

作　　者：许国瑞[1] 郝夏婧 刘炳辰 刘晓芳[1] 罗应立[1] XU Guo-rui;HAO Xia-jing;LIU Bing-chen;LIU Xiao-fang;LUO Ying-li(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：《电机与控制学报》2020年第2期20-27,共8页Electric Machines and Control

基　　金：国家自然科学基金(51977077);中央高校基本科研业务费专项资金资助(2018MS010)。

摘　　要：汽轮发电机转子大齿导条、铁心和导电槽楔等阻尼结构可为系统动态过程提供正阻尼,而大扰动过程中磁场饱和、畸变和集肤效应等因素使得三部分阻尼呈现非线性作用。为了定量描述汽轮发电机大扰动过程中转子三部分阻尼结构作用的强弱,本文将时步有限元法与多项式逼近法相结合,研究了汽轮发电机快关汽门大扰动过程中三部分阻尼结构单独作用和共同作用时的转子阻尼系数,分析了转子各部分阻尼结构对汽轮发电机阻尼作用强弱的影响。最后,提出了一种能够提高汽轮发电机阻尼转矩系数的转子阻尼结构。研究结果可为汽轮发电机转子结构设计,及如何提高发电机的稳定性提供理论基础和技术支持。Damping structures of turbine generator such as rotor damping bars,iron core and slot wedge can provide positive damping for the dynamic process of power system,while the damping effect is nonlinear during the large disturbance due to the magnetic saturation,distortion and skin effect.In order to quantitatively describe the strength of the three-part damping structure of the rotor during the large disturbance of the turbo generator,the time-step finite element method and the polynomial approximation method were coupled.And the damping torque coefficient during the large disturbance caused by fast valve.On the basis,the rotor damping coefficient in different cases was studied and compared.The influence of each components of rotor damping structures on the damping strength of turbine generator was analyzed.Finally a rotor damping structure that can improve the damping torque coefficient of turbine generator was proposed.The research results provide theoretical basis and technical support for the design of the rotor structure of turbine generator and improving generator stability.

关 键 词：阻尼转矩系数 多项式逼近法 阻尼作用 转子结构 汽轮发电机 

分 类 号：TM302[电气工程—电机]