Description: 电能质量扰动中谐波的检测可以采用分形几何学的局部方差分维数表示，而且不同类型电能其分维数不一样-Power quality disturbances in the harmonic detection can be used fractal geometry, partial differential dimension, said side, and different types of power of its fractal dimension is not the same as Platform: |
Size: 1024 |
Author:胡为兵 |
Hits:
Description: 优秀论文及配套源码。电压暂降是动态电能质量问题中最受关注的热点之一。大量新型电力电子设备的广泛使用对电网电能质量的要求越来越高，而且电压暂降在电网中又具有一定的传播性。因此，无论从电网还是用户都迫切需要对电压暂降进行研究和治理。对电压暂降的检测是解决电压暂降的前提条件，故本论文主要对电压暂降的检测方法进行研究。
本文分析了国内外短时电能质量扰动检测的研究现状，并着重讨论了短路故障、感应电动机启动和变压器激磁三种电压暂降扰动情况下电压暂降的特性；在此基础上选择了基于S变换的短时电能质量扰动检测方法，从S变换的结果S模矩阵及S复矩阵中提取出所需数据并以此来对各种扰动情况下的电压暂降的幅值、相位跳变、持续时间和谐波含量进行分析。仿真结果表明，该方法很好地实现了对电压暂降各特征量的检测。
-The voltage sag is one of most hot topics in dynamic electric energy problems. Masses of new power and electron facilities have been put into use widely, requiring a high quality of electric network and power, chiefly the voltage sag. Moreover, the voltage sag can spread in the electric network. So people have every reason to research and control the voltage sag. However, before developing the voltage sag, people have to detect it. On account of the above, this essay will chiefly focus on the detect methods of the voltage sags.
In this paper, the status of the short duration power quality disturbance based on the different method are researched firstly, and emphasizes the characteristic of the voltage sag under the situation of the three kinds of voltage sag disturbances like the short circuit fault, induction motor start-up and transformer excitation. On the basis of the above, the short duration power quality disturbance detection method based on S transform is chosen. The complex m Platform: |
Size: 541696 |
Author:NBB |
Hits:
Description: 优秀论文及配套源码。Hilbert-Huang变换(HHT)是一种新的非平稳信号处理技术，该方法由经验模态 分解(EMD)与Hilbert谱分析两部分组成。任意的非平稳信号首先经过EMD方法处理后被分解为一系列具有不同特征尺度的数据序列，每一个序列称为一个固有模态函数(IMF)，然后对每个IMF分量进行Hilbert谱分析得到相应分量的Hilbert谱，汇总所有Hilbert谱就得到了原信号的谱图。该方法从本质上讲是对非平稳信号进行平稳化处理，将信号中真实存在的不同尺度波动或趋势逐级分解出来，最终用瞬时频率和能量来表征原信号的频率含量。
本文研究了基于HHT的暂态电能质量扰动检测方法，介绍了HHT的基本原理和利用HHT检测电能质量多扰动信号的实现方法。仿真试验表明该方法可以实时检测扰动的起止时刻，持续时间和扰动幅度，适用于电能质量多扰动的监测和辨识系统。
-Hilbert-Huang Transform(HHT) is a new non-stationary signal processing technology，including the Empirical Mode Decomposition(EMD) and Hilbert spectral analysis．In this method，arbitrary non-stationary signals was divided into a series data sequence with different characteristic scales after the first EMD treatment，each sequence is called an intrinsic mode function(IMF)，and then each IMF component gained corresponding the Hilbert spectrum though Hilbert spectrum analysis，a summary of all Hilbert spectrum assembled to the spectra of the original signal．In essence，this method is a stable processing for non-stationary signal，which decomposed the different fluctuations or trends in the signal in rum，and represented the frequency content of the original signal using the final instantaneous frequency and energy．
This paper study a method to detect power quality disturbances based on the HHT，in which the principle and the realization of the HHT and the realization of power quality disturbance Platform: |
Size: 321536 |
Author:NBB |
Hits:
Description: 对基于小波变换的电能质量扰动检测和识别方法进行研究，在总结前人经验的基础上提出自己对算法的改进，并且利用MATLAB软件对改进算法进行仿真分析,取得令人满意的效果,验证所用方法的可行性。-Power quality disturbances detection and identification method based on wavelet transform and make their own improvements on the algorithm on the basis of previous experience, and improved algorithm for the simulation analysis using MATLAB software, obtain satisfactory results, verify thethe feasibility of the method. Platform: |
Size: 2172928 |
Author:车队 |
Hits:
Description: matlab 电能质量 扰动干扰检查 电压骤降 小波变换 仿真模型-matlab power quality power quality disturbances the interference check the voltage sag wavelet transform simulation model Platform: |
Size: 1024 |
Author:谢杨 |
Hits:
Description: 利用matlab编程，来实现基于提升复小波的暂态电能质量扰动的检测。-Use matlab to achieve the detection of complex wavelet based on lifting transient power quality disturbances. Platform: |
Size: 9216 |
Author:郝婉茹 |
Hits:
Description: 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 Platform: |
Size: 1363968 |
Author:李荣 |
Hits:
Description: This book chapter presents a comprehensive set of MATLAB/Simulink models used
to simulate various power quality disturbances. The models presented include
distribution line fault, induction motor starting, and transformer energizing that are
used to simulate various types of voltage sag event. Capacitor bank switching model
used to simulate oscillatory transient event, lightning impulse model used to simulate
impulsive transient event, nonlinear load models used to simulate triplen harmonic
and voltage notching disturbances generated the load side, and lastly electric
arc furnace model used to simulate flicker disturbance are also presented. This chapter
presents each power quality disturbance in MATLAB/Simulink model. The presented
models are used to simulate various power quality disturbances and waveforms for
power quality analysis research as well as contribute to the development of power
quality education and learning curriculum.-This book chapter presents a comprehensive set of MATLAB/Simulink models used
to simulate various power quality disturbances. The models presented include
distribution line fault, induction motor starting, and transformer energizing that are
used to simulate various types of voltage sag event. Capacitor bank switching model
used to simulate oscillatory transient event, lightning impulse model used to simulate
impulsive transient event, nonlinear load models used to simulate triplen harmonic
and voltage notching disturbances generated the load side, and lastly electric
arc furnace model used to simulate flicker disturbance are also presented. This chapter
presents each power quality disturbance in MATLAB/Simulink model. The presented
models are used to simulate various power quality disturbances and waveforms for
power quality analysis research as well as contribute to the development of power
quality education and learning curriculum. Platform: |
Size: 1174528 |
Author:ashi |
Hits:
Description: this file contains MATLAB-Simulink Model Based Shunt Active Power Filter Using Fuzzy Logic Controller to Minimize the Harmonics.
The problem of quality electrical energy provided to
the users has arisen. This is due to the increasing presence in
network of nonlinear loads.They constitute a harmonic pollution
source of the network, which generate many disturbances, and
disturb the optimal operation of electrical equipments. This work,
proposed a solution to eliminate the harmonics introduced by the
nonlinear loads. It presents the analysis and simulation using
Matlab Simulink of a active power filter (APF) compensating the
harmonics and reactive power created by nonlinear loads in
steady and in transients. The usefulness of the simulation
approach to APF is demonstrated , have a better power quality
insight using Matlab Simulink in order to develop new fuzzy
logic controller based active power filte-this file contains MATLAB-Simulink Model Based Shunt Active Power Filter Using Fuzzy Logic Controller to Minimize the Harmonics.
The problem of quality electrical energy provided to
the users has arisen. This is due to the increasing presence in
network of nonlinear loads.They constitute a harmonic pollution
source of the network, which generate many disturbances, and
disturb the optimal operation of electrical equipments. This work,
proposed a solution to eliminate the harmonics introduced by the
nonlinear loads. It presents the analysis and simulation using
Matlab Simulink of a active power filter (APF) compensating the
harmonics and reactive power created by nonlinear loads in
steady and in transients. The usefulness of the simulation
approach to APF is demonstrated , have a better power quality
insight using Matlab Simulink in order to develop new fuzzy
logic controller based active power filte Platform: |
Size: 404480 |
Author:sadegh |
Hits:
Description: 基于S变换的电能质量检测，可以实现电压暂升暂降中断等的扰动检测(The power quality detection based on S transform can detect disturbances such as voltage sags, interruptions and so on.) Platform: |
Size: 674816 |
Author:学渣就是我 |
Hits:
Description: 模糊逻辑控制器的谐波最小化。出现了给用户提供优质电能的问题。这是由于网络中非线性负载的增加，构成了电网的谐波污染源，产生了许多干扰，干扰了电气设备的优化运行。本文提出了消除非线性负载引入的谐波的解决方案。利用Matlab Simulink对有源电力滤波器（APF）在稳态和暂态过程中对非线性负载产生的谐波和无功功率进行了补偿和分析。仿真方法对有源电力滤波器的实用性得到了证明，利用MATLAB SIMULINK具有更好的电能质量洞察力，以开发基于有源电力滤波器的新型模糊逻辑控制器(This is due to the increasing presence in network of nonlinear loads.They constitute a harmonic pollution source of the network, which generate many disturbances, and disturb the optimal operation of electrical equipments. This work, proposed a solution to eliminate the harmonics introduced by the nonlinear loads. It presents the analysis and simulation using Matlab Simulink of a active power filter (APF) compensating the harmonics and reactive power created by nonlinear loads in steady and in transients. The usefulness of the simulation approach to APF is demonstrated , have a better power quality insight using Matlab Simulink in order to develop new fuzzy logic controller based active power filte) Platform: |
Size: 405504 |
Author:阿飞之父 |
Hits:
Search - Power Quality Disturbances matlab