基于定子电流法的绕线转子无刷双馈发电机偏心故障研究
Study on Eccentricity Fault of Brushless Doubly-fed Generator With Wound Rotor Based on Motor Current Signature Analysis
阚超豪 1张恒 1方裕超 1蒋涛 1程源1
作者信息
- 1. 新能源利用与节能重点实验室(合肥工业大学),安徽省 合肥市 230009
- 折叠
摘要
绕线转子无刷双馈电机在船舶轴带发电以及风力发电等领域中具有良好的应用前景.转子偏心是一种常见的机械故障,威胁着现代化工业体系的稳定运转,因此实现其状态检测和故障诊断非常关键.由于无刷双馈电机具有特殊的定、转子绕组结构以及复杂的气隙磁场,因此传统的故障检测方法无法直接用于该类电机.该文通过定子电流法提取了功率绕组电流的特征频率分量作为故障指标,实现对静偏心、动偏心以及混合偏心的无创诊断.建立故障电机的时步有限元模型,并通过详细的故障机理分析,得出不同类型的偏心故障可能导致的特征频率信号.最后,以一台2/4对极无刷双馈电机为例,并通过有限元仿真、样机试验验证解析法的结论,为绕线转子无刷双馈电机偏心故障的精准检测提供了理论依据.
Abstract
Brushless doubly-fed machine(BDFM)with wound rotor has great prospects in the field of generation system as ship shaft and wind power generator.Eccentricity fault is a common mechanical fault,which threatens the stable operation of modern industrial system,so it is of great importance to achieve condition monitoring and fault diagnosis.Traditional fault diagnosis methods are not directly applicable to BDFM due to the special design of winding and complex magnetic field pattern.This paper extracts the current harmonics of power winding as fault indicators by the motor current signal analysis(MCSA)to realize the non-invasive diagnosis of static-,dynamic-and mixed eccentricity.A time-stepped finite element model of the faulty machine is established.The characteristic frequencies that could result from different types of the faults are deduced through detailed mechanism analysis.Finally,a 2/4 number of pole pairs BDFM is used as an example and the accuracy and validity of analytical method is verified by finite element simulation and experiment,which provides a theoretical basis for accurate detection of eccentricity faults in brushless doubly-fed machine with wound rotor.
关键词
无刷双馈发电机/转子偏心/时步有限元法/频谱分析/故障诊断Key words
brushless doubly-fed generator/rotor eccentricity/time-stepping finite-element/spectrum analysis/fault diagnosis引用本文复制引用
基金项目
国家自然科学基金(51377040)
安徽省重点研发计划(202104a05020078)
出版年
2024
国家科技期刊平台
NSTL
万方数据