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| 摘要: |
| 结合带通滤波器的瞬时谐波检测方法，设计了基于1／2周期重构离散傅里叶变换带通滤波器的谐波检测系统。该带通滤波器在基频处幅值为1，在各次谐波处幅值为0，且在基频处的相频特性过零点。系统通过带通滤波器分离出基波分量，再从原电流中减去基波分量得到谐波分量。计算量小于快速傅里叶变换。理论和仿真表明，系统可检测电路稳态和暂态谐波．且缩短了动态响应时间，改善了滤波器的跟踪性能。 |
| 关键词: 离散傅里叶变换 1/2周期 重构 谐波检测 |
| DOI： |
| 分类号:TM133 TM833 |
| 基金项目:湖北省自然科学基金 |
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| Instantaneous harmonic detection based on DFT reconfiguration by half period |
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LIU Kai-pei LIU Chuan-lin
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| Abstract: |
| Combined with the band-filter-based instantaneous harmonic detection method, a harmonicdetection system based on DFT(Discrete Fourier Transform) reconfiguration by 1/ 2 period is designed. The fundamental amplitude of the proposed band filter is 1,its harmonic amplitude is 0 and its fundamental phase is 0. The harmonic component is obtained by subtracting the fundamental com-ponent,which is separated from the original current through the band filter. Its computing work is less than that of fast Fourier transform. The theoretic and simulative results show that the pro-posed system can detect the steady and transient harmonics with shorter dynamic response time and better tracing performance of filter. |
| Key words: DFT,1/ 2 period,reconfiguration,harmonic detection |
