摘要
"强直弱交"大电网背景下,换流站的动态无功支撑能力愈发重要,而调相机凭借其无功补偿优势成为当前研究的重点。现场中调相机转子偏心频繁出现,对调相机的安全稳定运行造成了重大影响。以转子偏心故障为研究对象,推导偏心前后气隙磁密和定子振动的变化特征,发现偏心后气隙磁密出现偶次谐波,定子出现奇数倍频振动的故障特征。提出基于磁密谐波与定子振动特性的动态偏心故障诊断方法以及应用检测线圈的故障特征提取方法。以某300 MVar大型调相机结构参数为依据,利用ANSOFT软件建立有限元模型,验证所提诊断方法的正确性。该诊断方法比以单一的电气或振动特性作为诊断依据准确度更高,操作简便,同时不受运行状态影响,能够为大型调相机的安全稳定运行提供保证。
Under the background of "strong HVDC and weak AC"power grid, the dynamic reactive power support capacity is becoming more and more important in converter station.With the advantage of reactive power compensation, the condenser has become the focus of current research.The rotor eccentricity frequently occurs in the field, which has a major impact on the safe and stable operation of the condenser.In this paper, the rotor eccentric fault was taken as the research object.The variation characteristics were derived about air gap flux density and stator vibration.It was found that the air gap flux density had even harmonics and the stator had odd multiple frequency vibration after eccentricity.Based on magnetic density harmonic and stator vibration characteristics, a dynamic eccentric fault diagnosis method was proposed.A fault feature extraction method using detection coil was applied.In order to verify the correctness of the diagnosis method, the finite element model was established by ANSOFT software based on the structural parameters of a 300 Mvar large condenser.Compared with the single electrical or vibration characteristic as the diagnosis basis, the proposed method had higher accuracy and simple operation.It was not affected by the operation status, which could provide guarantee for the safe and stable operation of large condenser.
作者
林万德
王生杰
包正红
王理丽
王生富
蒋玲
李永刚
姜猛
LIN Wande;WANG Shengjie;BAO Zhenghong;WANG Lili;WANG Shengfu;JIANG Ling;LI Yonggang;JIANG Meng(Electric Power Research Institute,State Grid Qinghai Electric Power Company,Xining810000,Qinghai,China;Qinghai Key Laboratory of High Altitude Electric Power Research,Xining810000,Qinghai,China;Qinghai High Altitude Power Engineering Technology Research Center,Xining810000,Qinghai,China;Department of Electrical Engineering,North China Electric Power University,Baoding071000,Hebei,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2021年第6期132-139,共8页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(51777075)
国家电网公司科技项目(SGTYHY/18-JS-202)。
关键词
大型调相机
转子偏心
故障诊断
磁密谐波
定子振动
检测线圈
有限元
large condenser
rotor eccentricity
fault diagnosis
flux density harmonic
stator vibration
detection coil
finite element method
