汽轮发电机转子阻尼结构对大扰动低频振荡的影响  

Influence of rotor damping structure of turbine generators on low frequency oscillation under large disturbance

作　　者：许国瑞[1] 李金香[2] 付永旗 胡笳 孙玉田[2] 刘晓芳[1] XU Guo-rui LI Jin-xiang FU Yong-qi HU Jia SUN Yu-tian LIU Xiao-fang(School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China State Key Laboratory of Hydropower Equipment （Harbin Institute of Large Electrical Machinery）, Harbin 150040, China China Power International Holding Ltd,Beijing 100080, China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]水力发电设备国家重点实验室(哈尔滨大电机研究所),黑龙江哈尔滨100084 [3]中国电力国际有限公司,北京100080

出　　处：《电机与控制学报》2017年第8期9-17,共9页Electric Machines and Control

基　　金：国家自然科学基金(51507059;51477049);中央高校基本科研业务费专项资金资助(2015QN03)

摘　　要：为了研究汽轮发电机转子大齿导条、导电槽楔和转子铁心等转子阻尼结构在大扰动低频振荡过程中的作用,首先建立了用于研究大扰动低频振荡过程中汽轮发电机转子各部分阻尼结构作用的场-路耦合时步有限元模型,并通过实验进行了验证;然后采用该模型研究了汽轮发电机转子各部分阻尼结构大扰动低频振荡过程中的作用,分析了三部分阻尼单独作用和共同作用时,对大扰动低频振荡影响较大的阻尼结构;最后研究了不同材料转子槽楔对汽轮发电大扰动低频振荡过程的影响。结果表明:汽轮发电机转子阻尼作用可以有效抑制大扰动后的低频振荡过程;在三部分阻尼中转子槽楔所起的作用较大,且转子采用铝合金槽楔对于抑制大扰动低频振荡的效果明显好于不锈钢槽楔。It aims to study the effect of rotor damping structure which contains damping bars,the rotor iron core and rotor slot wedges on low frequency oscillation （LFO） under large disturbance.Firstly,the time stepping finite element model of turbine generator was built to study the effect of rotor damping structure on LFO and the model was tested by the experiment of 7.5 kW model machine.Then,the influence of rotor damping on LFO under large disturbance was studied under the individual and combined effect of three components of rotor damping structures.Finally,the influence of different rotor slot wedge material on LFO was studied.The results show that the rotor damping structure can suppress LFO under large disturbance.The rotor slot wedge plays a more vital role during LFO after large disturbance and the aluminum alloy slot wedge has a better suppression effect than that made of stainless steel.

关 键 词：转子阻尼结构 大扰动 低频振荡 汽轮发电机 时步有限元 

分 类 号：TM302[电气工程—电机]