CAJ | 학술논문

提出一种抗模态混叠的EMD复合算法。首先，通过改进频率外差方法，增加混叠模态分量间的频谱距离，有效分离出倍频模态混叠成分；其次，结合小波奇异点检测技术，确定各模态分量的自适应滑动分析窗口，实现间歇性混叠模态分离和振荡模式非平稳参数辨识。为验证算法的有效性，利用测试算例和电网仿真算例进行了测试分析，结果表明，该算法能够有效分离出混叠模式分量，对于模式复杂的低频振荡信号，能够有效分离出对应的低频振荡模式，具有较高的振荡模式信息检测精度。
제출일충항모태혼첩적EMD복합산법。수선，통과개진빈솔외차방법，증가혼첩모태분량간적빈보거리，유효분리출배빈모태혼첩성분；기차，결합소파기이점검측기술，학정각모태분량적자괄응활동분석창구，실현간헐성혼첩모태분리화진탕모식비평은삼수변식。위험증산법적유효성，이용측시산례화전망방진산례진행료측시분석，결과표명，해산법능구유효분리출혼첩모식분량，대우모식복잡적저빈진탕신호，능구유효분리출대응적저빈진탕모식，구유교고적진탕모식신식검측정도。
In this paper, an anti mode mixing empirical mode decomposition (EMD) composite algorithm is proposed. First, the improved frequency heterodyne method is addressed to increase the spectral distance between mode mixing components in order to isolate the octave mode mixing components. Second, the wavelet singularity detection technology is applied to determine the adaptive sliding analysis window for each mode and then implement the intermittent mixing modes separation and their nonstationary parameters identification. In order to verify the validity of the algorithm, a test case and a grid simulation case are used to test and analyze the EMD composite algorithm. The analysis result shows that the proposed algorithm can isolate the mode mixing component effectively. Moreover, for a low frequency oscillation signal with complex modes, the proposed algorithm is able to isolate the corresponding low frequency oscillation mode and has high detection accuracy of oscillation mode information.