电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2011年
20期
1-6
,共6页
李成鑫%刘俊勇%杨嘉湜%姚良忠%M.BAZARGAN
李成鑫%劉俊勇%楊嘉湜%姚良忠%M.BAZARGAN
리성흠%류준용%양가식%요량충%M.BAZARGAN
经验模态分解%频移原理%低频振荡%振荡模式
經驗模態分解%頻移原理%低頻振盪%振盪模式
경험모태분해%빈이원리%저빈진탕%진탕모식
empirical mode decomposition%frequency shift principle%low frequency oscillation%oscillation mode
当信号中2个单频分量的频率在2倍频内时,经验模态分解(EMD)无法将2个分量分解开。为提高EMD的频率分辨率,提出了基于信号调制的频移EMD算法。此方法增大了信号中组成分量的频率比,使之达到EMD可分的程度。将该方法应用于电力系统低频振荡模态参数的提取,能较好地提取2倍频范围内的低频振荡模态分量的瞬时频率、瞬时幅值、相位及阻尼比等参数,数值仿真和实例分析均表明了该方法的有效性。
噹信號中2箇單頻分量的頻率在2倍頻內時,經驗模態分解(EMD)無法將2箇分量分解開。為提高EMD的頻率分辨率,提齣瞭基于信號調製的頻移EMD算法。此方法增大瞭信號中組成分量的頻率比,使之達到EMD可分的程度。將該方法應用于電力繫統低頻振盪模態參數的提取,能較好地提取2倍頻範圍內的低頻振盪模態分量的瞬時頻率、瞬時幅值、相位及阻尼比等參數,數值倣真和實例分析均錶明瞭該方法的有效性。
당신호중2개단빈분량적빈솔재2배빈내시,경험모태분해(EMD)무법장2개분량분해개。위제고EMD적빈솔분변솔,제출료기우신호조제적빈이EMD산법。차방법증대료신호중조성분량적빈솔비,사지체도EMD가분적정도。장해방법응용우전력계통저빈진탕모태삼수적제취,능교호지제취2배빈범위내적저빈진탕모태분량적순시빈솔、순시폭치、상위급조니비등삼수,수치방진화실례분석균표명료해방법적유효성。
As two individual components in a signal with frequencies within an octave is usually indecomposable by the normal empirical mode decomposition(EMD) method,to improve the frequency resolution,a method based on frequency shift EMD capable of enlarging the component frequency difference to reach the EMD identifying level is presented.In its application to extracting model parameters of low frequency oscillation in the power system,this method proves fairly effective in extracting model parameters in a signal with frequencies within an octave,such as,instantaneous frequency,instantaneous amplitude,phase and damping ratio,etc,as shown by numerical simulation and case analysis results.