林万德, 王生杰, 包正红,等.基于谐波与振动特性的大型调相机转子偏心故障诊断方法[J].河南理工大学学报（自然科学版）,2021,40(6):132-139.

LIN W D, WANG S J, BAO Z H, et al.Rotor eccentricity fault diagnosis method of large condenser based on harmonic and vibration characteristics[J].Journal of Henan Polytechnic University(Natural Science) ,2021,40(6):132-139.

基于谐波与振动特性的大型调相机转子偏心故障诊断方法

林万德1,2,3, 王生杰1,2,3, 包正红1,2,3, 王理丽1,2,3, 王生富1,2,3, 蒋玲1,2,3, 李永刚4, 姜猛4

1.国网青海省电力公司 电力科学研究院，青海 西宁 810000;2.青海省高海拔电力研究重点实验室，青海 西宁 810000;3.青海省高海拔电力工程技术研究中心，青海 西宁 810000;4.华北电力大学 电力工程系，河北 保定 071000

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。

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

doi:10.16186/j.cnki.1673-9787.2020100048

基金项目:国家自然科学基金资助项目（51777075 ）；国网青海省电力公司科技项目《直流换流站调相机转子运行状态诊断技术研 究》资助

收稿日期:2020/10/21

修回日期:2020/12/29

出版日期:2021/11/15

Rotor eccentricity fault diagnosis method of large condenser based on harmonic and vibration characteristics

LIN Wande1,2,3, WANG Shengjie 1,2,3, BAO Zhenghong1,2,3, WANG Lili1,2,3, WANG Shengfu1,2,3, JIANG Ling1,2,3, LI Yonggang4, JIANG Meng4

1.Electric Power Research institute,State Grid Qinghai Electric Power Company,Xining  810000 ,Qinghai,China;2.Qinghai Key Laboratory of High Altitude Electric Power Research ,Xining  810000 ,Qinghai,China;3.Qinghai High Altitude Power Engineering Technology Research Center,Xining  810000 ,Qinghai,China;4.Department of Electrical Engineering,North China Electric Power University,Baoding  071000 ，Hebei,China

Abstract:Under the background of strong HVDC and weak AC power grid ,the dynamic reactive power sup-port 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 occursin 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 hadodd 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 u-sing detection coil was applied. ln 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.

Key words:large condenser;rotor eccentricity;fault diagnosis;flux density harmonic;stator vibration;detection coil;finite element method

 基于谐波与振动特性的大型调相机转子偏心故障诊断方法_林万德.pdf