CAJ | 학술논문

传统的傅立叶变换可以精确确定出平稳波形中各次谐波的幅值;它只能检测基波和整数倍于基波的谐波,且傅立叶变换算法存在着频谱泄漏和栅栏现象,从而使检测出谐波的幅值、相角和频率均存在较大的误差.小波变换适合突变信号和非平稳信号的分析,可以准备的把握信号的局部细节,但无法准确分辨出各次谐波.在交―交变频调速系统中,单纯傅里叶分析和单纯的小波变换都无法准确地检测此谐波成分,故此本文采用基于小波变换和FFT相结合的方法来分析变频调速系统输出的电力信号.用小波变换检测输出信号的细节部分,对谐波次数混叠的信号采用FFT进行频谱分析,并进行了计算机仿真,取得了较满意的结果.
전통적부립협변환가이정학학정출평은파형중각차해파적폭치;타지능검측기파화정수배우기파적해파,차부립협변환산법존재착빈보설루화책란현상,종이사검측출해파적폭치、상각화빈솔균존재교대적오차.소파변환괄합돌변신호화비평은신호적분석,가이준비적파악신호적국부세절,단무법준학분변출각차해파.재교―교변빈조속계통중,단순부리협분석화단순적소파변환도무법준학지검측차해파성분,고차본문채용기우소파변환화FFT상결합적방법래분석변빈조속계통수출적전력신호.용소파변환검측수출신호적세절부분,대해파차수혼첩적신호채용FFT진행빈보분석,병진행료계산궤방진,취득료교만의적결과.
@@@@Fourier transform can accurately determine a smooth wave in the harmonic amplitude;it can only be detected several times in the fundamental and the whole of the fundamental harmonic, Fourier transform algorithm and there is a spectrum leakage fence, so that Detect the harmonic amplitude, phase and frequency of all there is a big error. Wavelet Transform can be accurately identified mutations in the moment Filtering signal interference, but not to distinguish harmonics. In AC frequency conversion systems, simple FFT analysis and simple wavelet transform can accurately detect the harmonic component, therefore this paper based on the wavelet transform and the method of combining FFT analysis of variable frequency speed regulation system output signal power. Using wavelet transform to detect the output signal of the details, the harmonic frequency aliasing signal using FFT spectrum analysis, all of the harmonics of the signal-aliasing using FFT spectral analysis, and computer simulation, and achieved satisfactory results.