HHT算法在電力系統(tǒng)低頻振蕩模態(tài)辨識中的應用
劉斌，楊培宏
內(nèi)蒙古科技大學 信息工程學院，內(nèi)蒙古 包頭 014010
摘 要：針對電力系統(tǒng)低頻振蕩信號的非線性、非平穩(wěn)特征，提出了一種新的處理方法——希爾伯特-黃變換(HHT)。該方法能夠克服傳統(tǒng)分析難以處理非平穩(wěn)信號的缺點；利用其中的經(jīng)驗模態(tài)分解(EMD)對信號模態(tài)分量的有效分離，對分量進行Hilbert變換，得到相應的參量。通過計算實現(xiàn)對振蕩信號的模態(tài)參數(shù)的辨識與提取，因此該方法能夠應用到阻尼控制器的設計中。仿真結(jié)果表明該控制器能有效地抑制電力系統(tǒng)低頻振蕩，提高了系統(tǒng)的安全穩(wěn)定性。
關鍵詞：低頻振蕩；經(jīng)驗模態(tài)分解；Hilbert變換；模態(tài)參數(shù)；阻尼控制器
中圖分類號：TM712 文獻標識碼：B 文章編號：1007-3175(2013)06-0037-03
Application of Hilbert Huang Transform Algorithm for Model Identification of Low Frequency Oscillation in Power Systems
LIU Bin, YANG Pei-hong
School of Information Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
Abstract: Aiming at the characteristics of nonlinear and non-stationary of low frequency oscillation signal in power system, this paper raised a kind of new method, Hilbert-Huang transform, which overcame the shortcoming that it was difficult for traditional analysis to deal with non-stationary signals. The empirical mode decomposition (EMD) method was used to decompose the low frequency oscillation signals and then carried out Hilbert transform for each model component to get corresponding parameters. The model parameters of oscillation signals were identified and extracted by calculation, so this method could be used for the damping controller design. The simulation results show that the controller can restrain low frequency oscillation of power system effectively, improving the safety and stability of the system.
Key words: low frequency oscillation; empirical model decomposition; Hilbert transform; model parameter; damping controller
參考文獻
[1] 朱方，趙紅光，劉增煌，等.大區(qū)電網(wǎng)互聯(lián)對電力系統(tǒng)動態(tài)穩(wěn)定性的影響[J].中國電機工程學報，2007，27(1)：1-7.
[2] 劉取.電力系統(tǒng)穩(wěn)定性及發(fā)電機勵磁控制[M].北京：中國電力出版社，2007.
[3] 王宇靜，于繼來.電力系統(tǒng)非線性振蕩模態(tài)分析[J].電力系統(tǒng)保護與控制，2010，38(20)：1-6.
[4] 韓松，何利銓，孫斌，等.基于希爾伯特-黃變換的電力系統(tǒng)低頻振蕩的非線性平穩(wěn)分析及其應用[J].電網(wǎng)技術，2008，32(4)：56-59.
[5] 李天云，高磊，趙妍.基于HHT的電力系統(tǒng)低頻振蕩分析[J].中國電機工程學報，2006，26(14)：24-30.
[6] Kamwa I，Beland J，Trudel G，et al．Wide-area monitoring and control at Hydro-Quebec：past，present and future[C]//Proceedings of IEEE Power Engineering Society General Meeting，2006．
[7] 楊德昌，Rehtanzc，李勇，等.基于改進希爾伯特-黃變換算法的電力系統(tǒng)低頻振蕩分析[J].中國電機工程學報，2011，31(10)：102-106.
