A Fast Harmonic Detection Method Based on Recursive DFT

摘要：

This paper proposed a fast harmonic detection method based on recursive Discrete Fourier Transform, which is suitable for real-time calculation. The main features of the proposed method are that 1) it can be used to detect only specific harmonic components, 2) the recursive method needs few calculation, so harmonic detection and compensation can be implemented on-line, 3) spectrum update is implemented in a step larger than one sampling period to avoid over-sampling, 4) time-domain windowing has been taken into account to reduce spectral leakage caused by asynchronous sampling. These characteristics make the proposed method especially compatible with hybrid active filter, in which structure only specific harmonic components concerned are needed to be analyzed and harmonic compensation is implemented almost immediately.

关键词： Recursive DFT harmonic detection windowing real-time calculation spectrum leakage

作者: Xin Limin Xu Weisheng Yu Youling

作者单位: School of Electronics and Information Engineering,Tongji University,Shanghai 201408,China

会议类型: 国际会议

会议名称: 第八届国际电子测量与仪器学术会议(Proceedings of 2007 8th International Conference on Electronic Measurement & Instruments)

会议地点: 西安

会议语种:英文

在线出版日期: 2007-08-16（万方平台首次上网日期，不代表论文的发表时间）