摘要
为了减少大功率PWM整流器中采集到的固有噪声信号的影响,提高其变流控制的精度,将小波分析理论引入到PWM整流领域。噪声部分一般包含在高频系数中,利用db小波对PWM整流器交流侧的电流反馈信号进行了多层小波分解,把反馈的电流信号分解为多个层次的高频部分和低频部分,最后按实际需求对信号进行重构达到降噪的目的。实验结果表明,小波分析方法的应用能有效地消除PWM整流器中的噪声干扰,在机车变流器的信号降噪处理方面有广阔的应用前景。
In order to reduce the impact of the inherent noise signal on the high-power PWM rectifier, and enhance the control precision of the converter, the wavelet analysis theory was introduced to PWM rectifier areas. The noise is generally contained in the high frequency coefficients. We has carried on the multilayered wavelet decomposition using the db wavelet to the current signal of the PWM rectifier exchange side. Decompose the current signal into many levels, including high frequency part and the low frequency part. Eventually the signal reconstruction can achieve the purpose of noise reduction. The experimental result indicated that the application of wavelet analysis methods can effectively eliminate the noise in the PWM rectifier, and it has broad application prospects in the locomotive signal processing.
出处
《电子测试》
2008年第9期21-24,共4页
Electronic Test
关键词
小波变换
PWM整流器
阈值
去噪
wavelet transform
PWM rectifier
threshold
noise reduction
