基于EEMD和Prony方法的次同步振蕩分析
馬曉騰1,顧煜炯1,楊曉峰2
(1 華北電力大學(xué) 能源動(dòng)力與機(jī)械工程學(xué)院,北京 102206;2 中國(guó)華能集團(tuán)清潔能源技術(shù)研究院有限公司,北京 102209)
摘 要:Prony是電力系統(tǒng)振蕩分析中常用的一種方法,但其對(duì)噪聲數(shù)據(jù)異常敏感,針對(duì)這一問(wèn)題,提出基于集合經(jīng)驗(yàn)?zāi)B(tài)分解(EEMD)與Prony的聯(lián)合分析方法用于分析電力系統(tǒng)次同步振蕩問(wèn)題。利用EEMD對(duì)含噪聲信號(hào)進(jìn)行分解,去除其中的高頻噪聲分量,同時(shí)有效解決經(jīng)驗(yàn)?zāi)B(tài)分解(EMD)去噪時(shí)的模態(tài)混頻問(wèn)題,得到平穩(wěn)信號(hào)后利用Prony可準(zhǔn)確識(shí)別次同步振蕩的特征參數(shù),將該聯(lián)合分析方法用于某300 MW汽輪發(fā)電機(jī)組的次同步振蕩分析中,驗(yàn)證了其抗噪性強(qiáng)和準(zhǔn)確度高的優(yōu)點(diǎn)。
關(guān)鍵詞:次同步振蕩;Prony方法;噪聲;集合經(jīng)驗(yàn)?zāi)B(tài)分解;汽輪發(fā)電機(jī)組
中圖分類號(hào):TM311 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2021)03-0020-05
Subsynchronous Oscillation Analysis Based on Ensemble Empirical Mode Decomposition and Prony Method
MA Xiao-teng1, GU Yu-jiong1, YANG Xiao-feng2
(1 School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China;
2 China Huaneng Group Clean Energy Research Institute, Beijing 102209, China)
Abstract: Prony method is used commonly in power system oscillation analysis, but it abnormally sensitive to noise data. A method based on ensemble empirical mode decomposition(EEMD) and Prony is proposed to solve this problem and is used to analyze subsynchronous oscillation of power system. Use EEMD to decompose the noisy signal, remove the high-frequency noise component, and effectively solve the modal mixing problem in empirical mode decomposition(EMD) denoising; after obtaining the stable signal, Prony can accurately identify the characteristic parameters of the subsynchronous oscillation. The joint analysis method is used in the subsynchronous oscillation analysis of a 300 MW steam turbine generator unit, which verifies the advantages of strong noise resistance and high accuracy.
Key words: subsynchronous oscillation; Prony method; noise; ensemble empirical mode decomposition; steam turbine generator
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