| 基于加Blackman窗FFT和db44小波包变换的综合电力系统谐波分析 |
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| 引用本文：徐宇飞，吕红芳，杨阳.基于加Blackman窗FFT和db44小波包变换的综合电力系统谐波分析[J].计算技术与自动化,2016,(1):51-55 |
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| 中文摘要:传统的傅里叶变换（FFT）主要适用于平稳信号的分析，确定信号的幅值和频率，但会丢失信号的局部信息，而小波包变换虽然可以准确得到信号局部细节的信息，但其分析精度不及傅里叶变换。将高分析精度的傅里叶变换和可以准确得到信号局部细节信息的小波包变换结合，提出结合两者优点的谐波分析方法。对平稳信号采用加Blackman窗傅里叶变换进行分析，得到信号的频率和幅值。对暂态信号采用db44小波包变换进行分解分析，得到信号局部细节的信息。通过 MATLAB仿真结果表明，该方法可以准确分析电力系统中的稳态谐波并准确定位暂态谐波。 |
| 中文关键词:谐波分析 FFT 小波包变换 Blackman窗 db44小波包 |
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| Power System Harmonic Detection Based on Blackman Windowed FFT and db44 Wavelet Packet Transform |
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| Abstract:This paper combined high analysis precision of Fourier transform with accurate local details of wavelet packet transform. Blackman window Fourier transform analyzed the stationary signal to get the signal frequency and amplitude. The transient signal was analyzed by wavelet packet transform db44 decomposition to get the local signal details information. MATLAB simulation results show that the method can analyze steady-state harmonic of power system and position transient harmonic accurately. |
| keywords:harmonic analysis FFT wavelet packet transform Blackman window db44 wavelet packet |
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