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【期刊论文】A Study of Wavelet Entropy Theory and Its Application in Power System
钱清泉, He Zhengyou, Cai Yumei, Qian Qingquan
,-0001,():
-1年11月30日
Forecasting the fault and danger in power system and limiting their incidence have been the emphasis in modern power system study. The abundant real-time data gathering in power system contain the complexity and uncertainty of the system, so mining and fusing a series of universal applicable quantities from these data to detect system fault and its stability is essential. Combining wavelet analysis, the modern time-frequency analysis technique, with entropy theory by exploiting their virtue will resolve the problem. In this paper, the feasibility of the wavelet entropy application in power system fault detection and distinguish is analyzed, the wavelet entropy concept based on wavelet analysis is defined, the computation methods of the two kinds of wavelet entropies are established, and the application of the wavelet entropy in transmission line fault detection is simulated and analyzed.
Time-Frequency Analysis, Wavelet Entropy, Fault Detection, Power System
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36浏览
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【期刊论文】Wavelet Analysis and Electric Power Market E-Commerce∗
钱清泉, He Zhengyou, Wang Zhibing, Qian Qingquan
,-0001,():
-1年11月30日
The outlines principle from Fourier transform to wavelet analysis technology including Fourier transform, short time Fourier transform, continuous wavelet transform, discrete wavelet transform are presented. Based on this, a E-commerce model applied in electric power market is investigated. in this model, wavelet analysis can be applied to solve series problems. So, wavelet based power system signal de-noises and compression techniques, wavelet based security attestation techniques, wavelet based data mining and information fusion techniques, wavelet based loads forecasting and Electricity price forecasting techniques, wavelet neural networks based data mining and information fusion techniques are discussed.
wavelet analysis,, E-commerce,, wavelet neural network,, electron watermarking,, data mining
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38浏览
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120下载
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钱清泉, 刘志刚
,-0001,():
-1年11月30日
本文在介绍多小波基本理论的基础上,探讨了基于多小波的信号去噪方法,针对目前多小波去噪的不足,提出一种基于自适应阈值的多小波去噪方法,应用于电力系统输电线故障暂态信号的去噪,并与基于传统阈值多小波和小波的去噪效果进行了比较,仿真结果表明,该方法可以根据实际信号自适应改变阈值大小,在去噪效果上优于传统多小波去噪方法。
多小波, 自适应阈值, 信号去噪
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43浏览
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【期刊论文】一种基于优化小波基的电力系统故障暂态数据压缩方法*
钱清泉, 何正友, 刘志刚
,-0001,():
-1年11月30日
在论述基于多分辨分析的小波基构造方法和小波分解理论的基础上,建立了基于离散小波变换的电力暂态信号数据压缩方法。针对电力故障信号基波伴随短时暂态成分的特点,研究了基于信号离散小波逼近品质,即离散逼近时域二范数最大的小波基优化方法。对一实际500kv输电线路故障暂态的分析计算表明,基于优化小波基的离散小波变换对电力故障暂态数据具有较高的压缩比和较小的重构误差。
数据压缩, 优化, 暂态信号, 小波变换
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81浏览
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【期刊论文】利用小波分析实现EHV输电线路单端量暂态保护研究∗
钱清泉, 何正友, 王晓茹
,-0001,():
-1年11月30日
介绍了连续小波变换定义、基于多分辨分析的Mallat快速小波分解算法。基于EHV输电线路故障暂态电流的特点和暂态保护基本原理,充分利用小波分析的时频局部化特点,建立了基于小波分析的暂态保护启动判据和跳闸判据。借助EMTDC仿真分析软件,研究了一实际电网EHV输电线路故障电弧特点和在不同故障条件下保护判据的有效性,结果表明基于小波分析的暂态保护方案是可行的。
小波分析, Mallet算法, 暂态保护, 保护判据
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28浏览
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145下载
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