DOC《毕业设计（论文）》

毕业设计(论文) 题目基于S变换的电压暂降 检测研究 基于S变换的电压暂降检测研究 摘要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. 关键词:短时电能质量扰动检测,电压暂降,S变换 Abstract 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 matrix and the amplitude matrix of the results of the S transform are used to extract waveforms to analyze the amplitude, phase jump, duration and harmonic of the disturbances of voltage sag under the various circumstances. Simulation results show that the proposed detection method could detect the characteristics of voltage sag quickly and correctly. Keywords: Detection of short duration power quality disturbances, voltage sag (dip), S-transform 目录第1章 绪论

1 1.1 电压暂降概述

1 1.1.1 研究电压暂降的目的及意义

1 1.1.2 电压暂降检测的主要方法及国内外研究现状

2 1.2 本论文主要研究内容

6 第2章 电压暂降扰动源特性分析

7 2.1 短路故障引起的电压暂降

7 2.2 感应电动机启动引起的电压暂降

8 2.3 变压器激磁引起的电压暂降

9 2.4 小结

10 第3章 S变换基本原理及基于S变换的电压暂降检测

11 3.1 S变换基本原理

11 3.1.1 一维连续S变换

11 3.1.2 一维离散S变换

12 3.2 基于S变换的电压暂降检测

13 3.2.1 S变换的Matlab编程实现

13 3.2.2 电压暂降特征量的检测

15 3.3 小结

16 第4章 仿真验证和结果分析

17 4.1 仿真验证

17 4.1.1 短路故障模型

17 4.1.2 感应电动机启动模型

19 4.1.3 变压器激磁模型

19 4.2 S变换结果分析

20 4.3 小结

39 第5章 结论与展望

41 5.1 结论

41 5.2 展望