Analysis of vibration characteristics of inter-turn short circuit fault of double-fed asynchronous wind turbine generator rotor

doi:10.3969/j.issn.1000-1565.2024.01.002

Abstract

Abstract: Aiming at the problem that the fault vibration mechanism of rotor inter-turn short circuit in doubly-fed induction generator is not clear, and it cannot provide a theoretical basis for fault diagnosis, the vibration characteristics of rotor inter-turn short circuit in doubly-fed induction generator are analyzed. Firstly, combined with finite element simulation and analytical derivation, the air gap magnetic density law of doubly-fed induction generator under rotor inter-turn short circuit is analyzed, and the unbalanced magnetic tension force of the rotor is obtained. Secondly, a nonlinear dynamic model of the rotor-bearing system of doubly-fed induction generator considering the rotor unbalanced magnetic tension is constructed, and the vibration simulation signal of the system under rotor inter-turn short circuit is obtained by using the nonlinear dynamic simulation. Finally, the rotor inter-turn short circuit experiment is carried out on the doubly-fed induction generator fault simulation bench, and the validity of the nonlinear dynamic simulation results is verified by experimental analysis. The results of nonlinear dynamics simulation and- DOI:10.3969/j.issn.1000-1565.2024.01.002双馈异步风力发电机转子匝间短路故障振动特性分析庞彬^1,2,周紫烨^1,2,齐晓帆¹,郑涵升^1,2(1.河北大学质量技术监督学院,河北保定 071002;2.河北省新能源汽车动力系统轻量化技术创新中心,河北保定 071002)摘要:针对双馈异步风力发电机转子匝间短路的故障振动机理尚不明确且无法为故障诊断提供理论依据的问题,开展了双馈异步风力发电机转子匝间短路故障振动特性分析.首先,结合有限元仿真及解析推导,分析转子匝间短路下双馈异步风力发电机的气隙磁密规律,得到转子所受的不平衡磁拉力;然后,考虑转子不平衡磁拉力的情况下构建双馈异步风力发电机转子-轴承系统非线性动力学模型,利用非线性动力学仿真获取转子匝间短路故障下系统的振动仿真信号;最后,在双馈异步风力发电机故障模拟实验台上进行转子匝间短路故障实验,利用实验分析验证非线性动力学仿真结果的有效性.非线性动力学仿真及实验分析结果均表明,转子匝间短路故障下双馈异步风力发电机转子-轴承系统振动信号的频谱存在转频的谐波成分,通过检测转频的谐波分量可诊断双馈异步风力发电机转子匝间短路故障,有效揭示了双馈异步风力发电机转子匝间短路的故障振动机理. 关键词:双馈异步风力发电机;转子匝间短路;非线性动力学;振动特性;故障诊断中图分类号:TK83 文献标志码:A 文章编号:1000-1565(2024)01-0009-08 Analysis of vibration characteristics of inter-turn short circuit fault of double-fed asynchronous wind turbine generator rotor PANG Bin^1,2, ZHOU Ziye^1,2, QI Xiaofan¹, ZHENG Hansheng^1,2(1. College of Quality and Technical Supervision,Hebei University,Baoding 071002,China;2. Hebei Technology Innovation Center for Lightweight of New Energy Vehicle Power System, Baoding 071002, China)Abstract: Aiming at the problem that the fault vibration mechanism of rotor inter-turn short circuit in doubly-fed induction generator is not clear, and it cannot provide a theoretical basis for fault diagnosis, the vibration characteristics of rotor inter-turn short circuit in doubly-fed induction generator are analyzed. Firstly, combined with finite element simulation and analytical derivation, the air gap magnetic density law of doubly-fed induction generator under rotor inter-turn short circuit is analyzed, and the unbalanced magnetic tension force of the rotor is obtained. Secondly, a nonlinear dynamic model of the rotor-bearing system of doubly-fed induction generator considering the rotor unbalanced magnetic tension is constructed, and the vibration simulation signal of the system under rotor inter-turn short circuit is obtained by using the nonlinear dynamic simulation. Finally, the rotor inter-turn short circuit experiment is carried out on the doubly-fed induction generator fault simulation bench, and the validity of the nonlinear dynamic simulation results is verified by experimental analysis. The results of nonlinear dynamics simulation and- 收稿日期:2023-05-05;修回日期:2023-09-04 基金项目:河北省自然科学基金资助项目(E2021201032) 第一作者:庞彬(1988—),男,河北大学讲师,博士,主要从事机械装备状态监测与故障诊断研究.E-mail:baodingpb@hbu.edu.cn第1期庞彬等:双馈异步风力发电机转子匝间短路故障振动特性分析experimental analysis show that the spectrum of the vibration signal of rotor-bearing system of doubly-fed induction generator has the harmonic component of frequency conversion under rotor inter-turn short circuit, and rotor inter-turn short circuit of doubly-fed induction generator can be diagnosed by detecting the harmonic component of the rotating frequency. This study effectively reveals the fault vibration mechanism of the rotor inter-turn short circuit in doubly-fed induction generator.

Key words: doubly-fed asynchronous wind turbine generator, rotor inter-turn short circuit, nonlinear dynamics, vibration characteristics, fault diagnosis

CLC Number:

TK83

PANG Bin, ZHOU Ziye, QI Xiaofan, ZHENG Hansheng. Analysis of vibration characteristics of inter-turn short circuit fault of double-fed asynchronous wind turbine generator rotor[J]. Journal of Hebei University(Natural Science Edition), 2024, 44(1): 9-16.

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