| 基于改进小波包变换的谐波检测方法研究 |
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| 引用本文： | 朱高中.基于改进小波包变换的谐波检测方法研究[J].工矿自动化,2013,39(7):61-64. |
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| 作者姓名： | 朱高中 |
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| 作者单位： | 渭南师范学院物理与电气工程学院,陕西渭南,714000 |
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| 基金项目： | 陕西省教育厅自然科学专项项目，渭南师范学院研究生专项项目，渭南市自然科学基础研究计划项目 |
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| 摘 要： | 针对基于傅里叶变换的谐波检测方法存在栅栏效应和频谱泄漏等问题,提出了一种基于改进小波包变换的谐波检测方法。该方法实现了对信号频带的均匀划分,通过选择适当的采样频率和小波包分解树,使所关心的谐波频率落到小波包频带的中心,从而减少频谱泄漏,有效提高了频谱分析精度。实验结果验证了该方法的有效性。
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| 关 键 词： | 谐波检测 小波包变换 变频调速 频谱泄漏 |
Research of harmonic detection method based on improved wavelet packet transformation |
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| Abstract: | For problems of fence effect and spectrum leakage of harmonic detection method based on Fourier transformation,the paper proposed a harmonic detection method based on improved wavelet packet transformation.The method achieves uniform division of signal band,makes harmonic frequencies concerned fall on the center of frequency band of wavelet packet by selecting appropriate sampling frequency and wavelet packet decomposition tree,so as to reduce spectrum leakage and effectively improve accuracy of spectrum analysis.Experimental results verify effectiveness of the harmonic detection method based on improved wavelet packet transformation. |
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| Keywords: | harmonic detection wavelet packet transformation frequency-conversion speed-regulation spectrum leakage |
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