-
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
-
bp-classification
使用bp（反向传播算法）实现分类问题，并观察分类过程中误差的变化。(Use bp (back-propagation algorithm) to achieve the classification and observe the changes in classification process in the error.)
- 2009-12-27 09:32:56下载
- 积分：1
-
实验五_（源程序2）
掌握OpenGL中的矩阵变换、模型视图变换及投影变换。(The perspective projection, main view, overhead view and side view of the space tetrahedron shown in Figure 7-41 of the textbook P228 are displayed in four viewing areas using the multi-view area in OpenGL.)
- 2019-06-09 22:48:07下载
- 积分：1
-
deformation_transfer_python_for_same_face
对三角网格进行驱动形变，使用Deformation transfer of Triangular Mesh算法(Driving Deformation of Triangular Mesh)
- 2020-06-16 15:20:02下载
- 积分：1
-
soybeanimageprocessing
进行黄豆质量评估，还可以对其他材料进行评价，主要是图像处理方面的(For soybean quality assessment, but also other materials can be evaluated, mainly in image processing)
- 2010-01-16 17:13:14下载
- 积分：1
-
TOOLBOX_calib
加州理工经典的摄像机标定程序，张正友博士的文章算法(The camera calibration program of the California Institute of Technology, the article algorithm of Dr. Zhang Zhengyou)
- 2018-03-19 15:32:23下载
- 积分：1
-
FPGA-FFT
FPGA实现二维傅里叶变换，语言用的是VHDL,有仿真文件(FPGA to achieve two-dimensional Fourier transform, the language used is VHDL, there are simulation files.)
- 2021-01-13 14:18:47下载
- 积分：1
-
hessian_frangi_filter_version2a
基于Hessian矩阵增强提取二维或三维医学图像中的血管(Vessel enhancement and extraction from 2D or 3D medical images)
- 2018-04-12 13:43:57下载
- 积分：1
-
udf
利用udf定义动网格的刚体运动，以使刚体能按照需要做任意的运动。(Use udf defined dynamic grid rigid body motion, so that just needs to be done in accordance with any physical exercise.)
- 2020-11-20 09:39:37下载
- 积分：1
-
fault
transeint behavior in induction generator during grid fault
- 2009-03-03 02:32:22下载
- 积分：1
