摘要
针对多极发电机故障振动信号信噪比低,故障识别难度高的不足,本文提出了频率加权能量算子(FWEO)与1.5维谱结合的方法来对发电机振动信号进行特征增强和滤噪。该方法应用频率加权能量算子来提取瞬态冲击特征和滤噪,应用1.5维谱来进行信号的二次特征增强和抑噪。对3对极发电机定子匝间短路故障前后定子振动数据的处理效果表明,本文所提方法能有效对发电机特征振动信号进行增强并实现有效滤噪,实现故障的快速识别;其处理效果不仅优于单一的频率加权能量算子和单一的1.5维谱,而且与当前流行的最大相关峭度解卷积算法相比具有一定优越性。
To overcome the shortage of low SNR(signal to noise ratio)of the multi-pole generator vibration signal which brings rigid difficulty to the fault diagnosis,a new method which combines the frequency weighted energy operator(FWEO)with the 1.5-dimentiaonal spectrum is proposed.This method uses FWEO to extract the shock features and remove the noise,while employs the 1.5-dimentional spectrum to enhance the characteristics vibration properties and filter the noise again.The application of this method to the 3 pole-pair generator before and after stator interturn short circuit fault validates the effectiveness of the method.Moreover,the comparison among the proposed method,the single FWEO,the single 1.5-dimentional spectrum,and the maximum correlation kurtosis deconvolution suggests that the proposed method is superior to these mentioned methods.
作者
何玉灵
孙凯
王涛
白洁
HE Yuling;SUN Kai;WANG Tao;BAI Jie(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,China)
出处
《大电机技术》
2021年第1期64-70,共7页
Large Electric Machine and Hydraulic Turbine
基金
国家自然科学基金(51777074)
河北省自然科学基金(E2020502032)
中央高校基本科研业务费专项基金(2020MS114,2018YQ03)
河北省青年拔尖人才支持计划([2018]-27)。
关键词
多对极发电机
定子匝间短路
振动信号
频率加权能量算子(FWEO)
1.5维谱
multi-pole generator
stator inter-turns short circuit(SISC)
vibration signal
frequency weighted energy operator(FWEO)
1.5-dimensional spectrum
作者简介
何玉灵(1984-),博士,研究方向大型发电机状态监测与故障诊断,副教授,硕士生导师。
