励磁绕组短路下关键运行参数差异对汽轮发电机转子动力学特性的影响  

Impact of key operation parameter difference on rotor dynamic charac-teristics in turbo-generator under field winding interturn short circuit

作　　者：张文[1] 何玉灵[1] 袁兴华[1] 徐明星 唐贵基[1] 王晓龙[1] 李俊卿[2] ZHANG Wen;HE Yu-ling;YUAN Xing-hua;XU Ming-xing;TANG Gui-Ji;WANG Xiao-long;LI Jun-qing(Department of Mechanical Engineering,and also the Hebei Key Laboratory of Electric Machinery Health Maintenance and Failure Prevention,North China Electric Power University,Baoding 071003,China;Department of Electrical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]华北电力大学机械工程系暨河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003 [2]华北电力大学电力工程系,河北保定071003

出　　处：《振动工程学报》2023年第4期1156-1168,共13页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(52177042);河北省自然科学基金资助项目(E2022502003);中央高校基本科研业务费专项基金资助项目(2020MS114);河北省第三批青年拔尖人才支持计划项目([2018]-27)。

摘　　要：分析了励磁绕组短路下,关键运行参数差异对汽轮发电机转子动力学特性的影响。关键运行参数包括短路程度、短路位置,以及电机负载率;转子动力学特性包括转子不平衡磁拉力激励特性、径向振动响应特性,以及转子铁芯动力学响应规律。基于柔性转子不平衡磁拉力激励与振动响应的理论分析、有限元仿真计算,以及动模试验来探索不同运行参数造成动力学特性差异的规律。结果表明:正常情况下转子不平衡磁拉力趋于零,转子振动以常规基频和定子传递过来的各偶次倍频为主;励磁绕组匝间短路下,转子不平衡磁拉力及其振动响应将产生新的奇次倍频成分,且通频振动幅值增大。随着短路程度或负载的增加,转子不平衡磁拉力与振动响应的基频将增大;短路位置越靠近大齿处,转子不平衡磁拉力与振动幅值越大;转子铁芯大齿的外表面和内槽表面边沿为动力学响应的危险位置。This paper comprehensively analyzes the effect of key operation parameter differences on the rotor dynamic characteris⁃tics of the turbine-generator under the FISC.The key operation parameters include short degree,short position and generator load rate.The rotor’s dynamic characteristics include rotor unbalanced magnetic pull(UMP)excitation characteristics,radial vibration response characteristics and rotor core dynamics response laws.This paper explores the difference in rotor dynamic characteristics acting under different operation parameters based on the theoretical analysis of UMP excitation and vibration response of flexible ro⁃tors,finite element simulation calculation and experiment verification.It is shown that the rotor UMP closes to zero in normal con⁃ditions,and the rotor vibration is dominated by conventional fundamental frequency and the even frequency doubling transmitted by the stator.The rotor UMP and its vibration response will produce a new odd-harmonic order component,and the amplitude of pass band vibration will also be increased.As the short degree or load increases,the amplitude of the fundamental frequency of the UMP and vibration response will be increase.Besides,the closer the short position is to the big tooth,the bigger the amplitude of the UMP and vibration response will be.The most dangerous of the dynamic response positions are located at the outer surface and the inner slot surface edge of the big tooth.

关 键 词：转子动力学特性 汽轮发电机 运行参数差异 励磁绕组匝间短路 不平衡磁拉力 

分 类 号：O347.6[理学—固体力学] TH165.3[理学—力学] TM341[机械工程—机械制造及自动化]