中国电机工程学报2013，Vol.33Issue(6)：76-84,前插10,10.
实时估计变流器电磁干扰频谱的综合方案
A Synthesis Scheme of Real-time Estimating Electromagnetic Interference (EMI) Spectrum in Converters
摘要
Abstract
To evaluate and suppress electromagnetic interference (EMI) of the operational electrical equipment, it is essential to estimate EMI spectrum accurately in real time. The issue of balance between volume and accuracy of data must be resolved in real-time spectrum analysis based on the fast Fourier transform (FFT). In this paper, a synthesis scheme was proposed that can estimate EMI spectrum of converters in real time. Firstly, in order to decrease the data size for real-time calculation, the rough spectrum of EMI was calculated through FFT on low resolution, and then the EMI peaks were selected to be locally zooming based on modulation in spectrum. Secondly, the best window function was adopted to reduce spectral energy leakage. Finally, a new set of symmetrical time-shift phase difference (STSPD) methods, which was designed in this paper, was used to correct the errors caused by picket-fence effect. And then the high accurately estimated parameters of EMI peak will be obtained. The optimal combination of window functions and STSPD correcting methods, which has the highest accuracy when peak frequencies are close each other, was found through screening. The experiment results of the DC/DC converter confirm that the synthesis scheme is fast and accurate.关键词
电磁干扰/频谱估计/局部精细化/实时估计变流器/窗函数/对称移位Key words
electromagnetic interference (EMI)/ spectrum estimation/ locally zooming/ real-time estimating converters/window function/ symmetrical time-shift分类
信息技术与安全科学引用本文复制引用
黄劲,熊蕊,张蓉,葛挺,赵国良,张宇..实时估计变流器电磁干扰频谱的综合方案[J].中国电机工程学报,2013,33(6):76-84,前插10,10.基金项目
国家自然科学基金项目(51177063) （51177063）
台达环境与教育基金会《电力电子科教发展计划》重点项目(DREK2011003). （DREK2011003）
