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计量学报  2015, Vol. 36 Issue (6): 622-627    DOI: 10.3969/j.issn.1000-1158.2015.06.16
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基于局部均值分解的电压暂降检测新方法
胡标1,王晓光1,吴丽娜2,吴素敏1
1.国网浙江省云和县供电公司, 浙江 云和 323600
2.华北电力大学, 河北 保定 071003
New Detection Method Based on Local Mean Decomposition for Voltage Sags
HU Biao1,WANG Xiao-guang1,WU Su-min1,WU Li-na2
1. State Grid Zhejiang Yunhe Electric Power Company, Yunhe, Zhejiang 323600, China
2. North China Electric Power University, Baoding, Hebei 071003, China
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摘要 提出了利用局部均值分解(LMD)方法对电压暂降进行检测和分析的新方法,该方法利用分解所得的瞬时幅值和瞬时频率进行电压暂降幅值、频率的检测以及扰动起止时刻的定位。针对LMD方法存在的“端点效应”问题,提出一种波形延拓新方法——横纵向比例延拓法。在进行电压暂降的检测时,首先对原始信号进行提升小波降噪,然后对去噪信号进行横纵向比例延拓,继而对延拓后的信号进行LMD 分解,将分解得到的乘积函数分量按原信号对应的时刻进行截取,得到改善端点效应后的分解结果,最后,从LMD分解后得到的瞬时幅值和瞬时频率提取电压暂降的特征信息。与希尔伯特-黄变换的检测结果进行了比较,结果表明所提出的电压暂降检测方法是可行、有效的,可为进一步进行电压暂降源扰动识别提供依据。
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作者相关文章
胡标
王晓光
吴丽娜
吴素敏
关键词 计量学电压暂降局部均值分解横纵向比例延拓端点效应扰动检测    
Abstract:A new approach for voltage sag detection and analysis using local mean decomposition (LMD) is proposed. The method uses instantaneous amplitude and instantaneous frequency obtained by the decomposition to detect the drop value, frequency and the starting and ending time of the voltage sag. A new method of waveform extension which names horizontal and vertical proportion extension method is proposed to improve the end effect of LMD. Firstly, the lifting wavelet is applied to denoise original signals and horizontal and vertical proportion extension is performed on the denoised signals. Then the extended signals are decomposed by LMD. Further, the product function given by the decomposition is intercepted according to the corresponding time of the original signals. Finally, the feature information of voltage sag is extracted form instantaneous amplitude and instantaneous frequency obtained by LMD. The test results are compared with the results of Hilbert-Huang transform (HHT),and the simulation results illustrate that the proposed method is feasible and effective, which can provide a basis for the further identification of different voltage sag sources.
Key wordsmetrology    voltage sags    local mean decomposition    horizontal and vertical proportion extension    end effect    disturbance detection
收稿日期: 2014-06-12      发布日期: 2015-10-20
PACS:  TB971  
基金资助:科技部技术创新基金项目(13C26211300469)
引用本文:   
胡标, 王晓光, 吴丽娜, 吴素敏. 基于局部均值分解的电压暂降检测新方法[J]. 计量学报, 2015, 36(6): 622-627.
HU Biao,WANG Xiao-guang,WU Su-min,WU Li-na. New Detection Method Based on Local Mean Decomposition for Voltage Sags. Acta Metrologica Sinica, 2015, 36(6): 622-627.
链接本文:  
http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2015.06.16     或     http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2015/V36/I6/622
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