摘要
应用开关函数的双傅里叶变换技术,分析逆变器的直流侧电流在正常运行、单管开路故障时的频谱。利用小波包分解的分频特性对逆变器直流侧电流信号进行小波包分解,求得故障特征频率相应子频带的小波包分解系数的均方根值,并将其作为逆变器单管开路故障的故障特征,以此作为逆变器单管开路故障诊断的依据。试验结果证明了该方法应用于逆变器单管开路故障诊断的可行性。
By using the double fourier transform of the switch function, the frequency spectrums of inverter under the condition of normal operating and Open fault of one transistor were analyzed. By the of wallet packet decomposition, DC side current signal was made. The RMS value of the wavelet packet decomposition coefficients of DC side current was calculated, and could be the symptom of open fault. The experimental results demonstrated that the proposed approach was feasible.
出处
《低压电器》
北大核心
2010年第23期53-57,共5页
Low Voltage Apparatus
关键词
逆变器
开路故障
小波包分解
直流侧电流
故障诊断
inverter
open fault
wavelet packet decomposition
DC side current
fault diagnose
