CAJ | 학술논문

传统HHT方法在分析谐波时存在模态混叠现象，不能有效得出各次谐波分量，所以本文采用基于小波分解的HHT方法来解决上述问题。该方法根据小波分解进行频带滤波，然后再利用em-pirical mode decomposition(EMD)分解得到准确的intrinsic mode function (IMF)，最后进行Hil-bert变换得到各次谐波分量频率和瞬时幅值，解决了传统HHT方法存在的模态混叠问题。首次将改进的Hilbert-Huang Transform(HHT)方法用于石油钻机系统中，并在Matlab/Simulink平台上搭建了石油钻机电网谐波源模型，仿真谐波电流信号，并将改进型HHT方法与传统的HHT方法进行对比，比较结果验证了改进型HHT方法的先进性和有效性。
전통HHT방법재분석해파시존재모태혼첩현상，불능유효득출각차해파분량，소이본문채용기우소파분해적HHT방법래해결상술문제。해방법근거소파분해진행빈대려파，연후재이용em-pirical mode decomposition(EMD)분해득도준학적intrinsic mode function (IMF)，최후진행Hil-bert변환득도각차해파분량빈솔화순시폭치，해결료전통HHT방법존재적모태혼첩문제。수차장개진적Hilbert-Huang Transform(HHT)방법용우석유찬궤계통중，병재Matlab/Simulink평태상탑건료석유찬궤전망해파원모형，방진해파전류신호，병장개진형HHT방법여전통적HHT방법진행대비，비교결과험증료개진형HHT방법적선진성화유효성。
Improved Hilbert-Huang Transform(HHT) is introduced for detection and analysis of power quality in oil rig power system for the first time in this paper.Mode mixing is happened when using Traditional HHT methods directly for harmonic analysis,and all harmonic components cannot be effectively separated.The HHT method based on wavelet decomposition is used to solve the problem in this paper.Firstly,signal is fil-tered according to wavelet decomposition.Then,the output of signal after band filter is decomposed by EMD, and accurate IMF components are obtained.Lastly,Hilbert transform is used for the IMF components,and ampli-tude and frequency of corresponding time can be detected accurately and quantitatively.Simulation results show that Improved HHT has better performance in analyzing Harmonics to Traditional HHT in oil rig power system.