| 引用本文: | 郝思鹏,袁 越,陈小虎,张仰飞,李先允,刘海涛.用窗口傅里叶脊提取时变振荡信息[J].电力自动化设备,2011,31(5): |
| HAO Sipeng,YUAN Yue,CHEN Xiaohu,ZHANG Yangfei,LI Xianyun,LIU Haitao.Time-varying oscillation information extraction by window Fourier ridge[J].Electric Power Automation Equipment,2011,31(5): |
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| 摘要: |
| Prony算法可以提取平稳信号的振荡频率和阻尼，但抗噪性能差，并且不能正确反映非平稳信号的振荡特性。提出用窗口傅里叶脊（WFR）分析非平稳振荡信号，其具有良好的抗噪性，WFR利用窗口傅里叶变换反映振荡信号的频域特性，以极大值点（脊点）反映信号振幅，通过窗口滑动反映振荡信号的时域特性，从而反映非平稳振荡信号的频率和阻尼时变性。算例说明，WFR不仅可以分析平稳信号的振荡信息，对于非平稳信号同样具有良好性能，更适合电力系统摇摆曲线的振荡信息分析。 |
| 关键词: Prony算法 窗口傅里叶脊 振荡信息 |
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| 基金项目:国家自然科学基金资助项目（51077068）；江苏省自然科学基金资助项目（BK2008366，BK2009353）；江苏省教育厅自然科学基金资助项目（10KJB470005） |
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| Time-varying oscillation information extraction by window Fourier ridge |
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HAO Sipeng1,2, YUAN Yue1, CHEN Xiaohu2, ZHANG Yangfei2, LI Xianyun2, LIU Haitao2
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1.Hohai University，Nanjing 210098，China;2.Nanjing Institute of Technology，Nanjing 211167，China
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| Abstract: |
| Prony arithmetic extracts the oscillation frequency and damping of smooth signal but not those of non-smooth signal，and its anti-noise performance is quite poor. It is proposed to apply WFR（Window Fourier Ridge） to non-smooth oscillation signal. It has excellent anti-noise performance. WFR uses the window Fourier transform to display oscillation frequency character and the maximum point（ridge point） to show signal amplitude. The time-varying characters of frequency and damping are displayed by sliding window. The results of case study show that WFR has excellent performance in oscillation information analysis for both smooth and non-smooth signals，suitable for the that of power system swing curves. |
| Key words: Prony arithmetic window Fourier ridge oscillation information |
