| 引用本文: | 崔艳,刘志刚,戴晨曦.HF-EMD频率选取原则及在暂态扰动检测中的应用[J].电力系统保护与控制,2014,42(21):47-53. |
| CUI Yan,LIU Zhi-gang,DAI Chen-xi.Frequency selection principle of HF-EMD and its application in transient disturbance detection[J].Power System Protection and Control,2014,42(21):47-53 |
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| 摘要: |
| 经验模态分解在处理电力系统暂态扰动信号时存在模态混叠的问题，基于高频谐波注入法的经验模态分解（简称HF-EMD）是一种简单高效的改进方法。该方法的有效性依赖于高频谐波频率的选取，而目前并没有有效的频率选取原则。着重对此问题进行了系统的研究，并通过理论分析和大量仿真试验得出了一个具体有效的选取原则: 当所注入的谐波频率在原信号高频成份的最小频率与该最小频率增加1/2倍基波频率的范围内时，HF-EMD普遍有效。对PSCAD模型仿真电能质量信号和变电站复杂实测扰动信号的分析表明，该原则具有高效性和普适性，能够有效提高暂态电能质量扰动信号的检测精度。 |
| 关键词: 电能质量检测 经验模态分解 模态混叠 高频谐波注入法 频率选取原则 |
| DOI：10.7667/j.issn.1674-3415.2014.21.008 |
| 分类号: |
| 基金项目:国家自然科学基金(U1134205,51377136) |
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| Frequency selection principle of HF-EMD and its application in transient disturbance detection |
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CUI Yan, LIU Zhi-gang, DAI Chen-xi
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School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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| Abstract: |
| Modal aliasing problem exists in empirical mode decomposition for the decomposition of transient power quality disturbances, and high-frequency harmonic injection based EMD (HF-EMD) is a simple and efficient method to improve it. The effectiveness of this method depends on the selection of the frequency of the high-frequency harmonic, and there is no effective frequency selection principle. Focusing on this problem, this paper conducts a systematic study, and through theoretical analysis and simulation test, a concrete and effective selection principle is presented. That is to say, when the injected frequencies are in the range from the smallest frequency of the original signal’s high-frequency components to adding a 1/2 times fundamental frequency of the smallest frequency, HF-EMD shows general validity. The analysis of power quality signals simulated by PSCAD and the actual complex disturbance signals of substation shows that this principle is efficient and universal. The detection accuracy of transient power quality disturbances can be effectively improved. |
| Key words: power quality detection EMD modal aliasing high-frequency harmonic injection frequency selection principle |
