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Locating-Voltage-Sags
电压跌落是最严重的动态电能质量问题之一,
精确定位电压跌落起止时间是应对电压跌落问题的
重要前提和基础。由于电压采样信号往往有噪声分
量,现有的方法在定位电压跌落的起止时间时存在
局限性。本文提出利用多小波变换及相邻系数去噪
的电压跌落定位方法。多小波兼有对称性、正交性、
有限支撑性和二阶消失矩等优异的信号处理性能,
利用GHM多小波可以准确定位电压跌落起止时间。
多小波变换系数在每层之间具有对应关系,多小波
相邻系数将紧相邻的若干个系数作为一个整体来确
定阈值,考虑了系数之间的相关性,能获得更好的
去噪效果。通过 Matlab 进行仿真验证,仿真结果表
明,所提出的方法的正确性。
(Voltage sag is one of the most serious
dynamic power quality problems. Critical start-time
and end-time are important indices for voltage sags.
But the sampling signals often have noisy component,
the locations of start-time and end-time are hard to get.
Wavelet is an effective tool for those non-stationary
signal processing and has been used in this field. Local
feature in the signal can be enlarged after the
transformation using the scalar wavelet. But scalar
wavelets cannot contain orthogonality, symmetry,
compact support and higher order of vanishing
moments simultaneously. In this thesis, multi-wavelets
GHM is used to detect and locate power quality
disturbances. Multi-wavelets offer many excellent
properties such as the same approximation order but
more compact support. The dependence of the
multi-wavelets coefficients varies with the level, so
neighboring coefficien)
- 2014-03-25 17:08:50下载
- 积分:1
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zhongxin
经过一系列步骤实现结构光的中心提取,结果还不错(After a series of steps, the center of structured light is extracted, and the result is not bad.)
- 2018-05-10 19:27:50下载
- 积分:1
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SRM
SRM空间富模型隐写分析算法,选区高维特征,使用集成分类器进行训练(Spatial Rich Model Steganalysis Algorithms, Selection of High-Dimensional Features, Using Integrated Classifier for Training)
- 2021-03-30 16:09:09下载
- 积分:1
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图像融合算法
针对电气设备同一场景的红外与可见光图像间一致特征难以提取和匹配的问题,提出了一种基于斜率一致性的配准方法。首先通过数学形态学方法分别提取红外与可见光图像的边缘,得到粗边缘图像;然后通过SURF算法提取两幅边缘图像的特征点,根据正确的匹配点对之间斜率一致性的先验知识,进行特征点匹配;最后通过最小二乘法求得仿射变换模型参数并实现两幅图像的配准。实验结果表明,该方法有效提高了匹配点对的正确率,能够对电气设备红外和可见光图像实现高精度的配准。(In this paper, a method based on slope consistency is proposed to solve the problem that the uniform features of infrared and visible images are difficult to extract and match. Firstly, the edges of infrared and visible images were extracted by mathematical morphology, and the rough edge images were obtained. Then, the feature points of two edge images were extracted by SURF algorithm, and the priori knowledge of slope consistency was obtained according to the correct matching point, and the feature points were matched. Finally, the model parameters of affine transformation are obtained by least square method and the registration of two images is realized. The experimental results show that this method can effectively improve the accuracy of matching points, and can realize high precision registration of infrared and visible images of electrical equipment.)
- 2018-03-24 10:53:41下载
- 积分:1
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[程序源代码]详解MATLAB数字图像处理
说明: 给出数字图像处理的,程序MATLAB的原代码,可以直接用于实验与验证(Given digital image processing, the original code of MATLAB program, can be directly used for experiment and verification)
- 2020-09-23 10:07:48下载
- 积分:1
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CS
说明: CS的一些重构算法包括OMP,somp,romp,SAMP,CoSaMp,GPSR等等其中还包括了小波变换,dct变换等等(compressive sensing)
- 2013-03-29 13:47:52下载
- 积分:1
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PhysRevE.71.037604
运用本征模式匹配理论研究了声子晶体实际的声学速度沿两个高度对称的方向上的第一布里渊区里的特性。(The effective acoustic velocity along two highly symmetric directions of the first Brillouin zone is studied in
a two-dimensional squarely arranged solid-solid phononic crystal.)
- 2013-01-15 22:36:38下载
- 积分:1
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脉冲响应不变法设计IIR数字滤波器matlab
说明: 1. 掌握利用脉冲响应不变法设计IIR数字滤波器的原理和具体方法。
2. 加深理解数字滤波器与连续时间滤波器之间的技术指标转化。
3. 掌握脉冲响应不变法设计IIR数字滤波器的优缺点及使用范围(1. Master the principle and specific method of designing IIR digital filter with impulse response invariant method.
2. Deepen the understanding of the technical index transformation between digital filter and continuous time filter.
3. Master the advantages, disadvantages and application scope of the design of IIR digital filter by the pulse response invariant method)
- 2020-05-24 09:22:52下载
- 积分:1
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lrojp2
求解SVM问题的一种高效算法,每次更新两个a()
- 2018-02-05 21:34:09下载
- 积分:1
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mean-shift
说明: 基于mean-shift运动目标跟踪matlab源代码(Based on mean-shift object tracking matlab source code)
- 2010-04-12 12:27:14下载
- 积分:1