谐波和无功电流检测的仿真研究

谐波和无功电流检测的仿真研究

摘要

随着国民经济的发展和人民生活水平的提高，电力电子产品广泛地应用于工业控制领域，然而这些电力电子产品装置使得电力系统中的谐波污染日趋严重。我们都知道电力系统中许多电气元件都产生不同程度的谐波，各种整流设备尤为严重，它带来的危害也不可忽视，由此研究谐波和无功电流是十分必要的。

本文首先介绍了谐波的基本概念、谐波的产生及其危害、电网对谐波电压和谐波电流的限值，阐述了谐波问题研究的必要性，国内外研究的状况及本文研究

i i 检测方的内容。基于顺势无功理论谐波检测方法，得到了p、q检测方法和

p q

法，并利用MATLAB/SIMULINK软件进行了仿真研究。

关键词：电力系统，谐波，瞬时无功理论，MATLAB仿真

Harmonic and reactive current testing and simulation

ABSTRACT

Following the development of the national economy and the living standard of people, the electric powers electronics product is broadly applied to the control realm in the industry. These electric powers electronics equips to make a harmonic pollution problem within the electric power system is serious gradually. As we know, a lot of electric components produce various degrees of harmonies in the power system, it is particularly serious to do it such as various kinds of rectification equipment and inverters and converters，And it cannot ignore the harm of harmonic, therefore researching harmonic and reactive current is very necessary.

The paper introduces the concept of harmonics, its harm to power grid and limitation of harmonics voltage and current harmonics, and it also demonstrates the necessity of eliminate harmonics, and briefly introduces several methods to eliminate harmonics and research of both here and abroad. The paper analyzes the principles of the harmonic. Then the paper detailed introduces the theory of the way of harmonic currents of a single-phase and the way of harmonic currents of a there-phase and instantaneous reactive power. In the end the paper simulates harmonics detection methods by MATLAB/SIMULINK.

KEY WORDS: Power systems，harmonic，Instantaneous reactive power，MATLAB simulation，Harmonic current detection

目录

前言 (1)

第1章谐波理论基础 (5)

1.1谐波的定义 (5)

1.2 线性负载和非线性负载 (7)

1.2.1 线性负载 (7)

1.2.1 非线性负载 (7)

1.3 谐波的产生 (7)

1.4 谐波的危害与影响 (8)

1.5 谐波的危害与影响 (9)

1.5.1 奇次谐波 (9)

1.5.2 偶次谐波 (10)

1.6 谐波的参数 (10)

1.6.1 谐波电流 (10)

1.6.2 谐波电压 (10)

1.7 与谐波有关的参数定义 (10)

1.7.1 阻抗 (10)

1.7.2 阻抗系数 (10)

1.7.3 谐振 (10)

1.7.4 谐振频率 (11)

1.7.5 无功功率 (11)

1.7.6 无功功率补偿 (11)

1.8 本章小结 (11)

第2章谐波检测方法分析 (12)

2.1 前言 (12)

2.2 频域理论 (12)

2.3 时域理论 (13)

2.3.1 快速傅里叶变换法 (13)

2.3.2 基于瞬时无功功率的检测方法 (13)

2.3.3 基于瞬时无功功率的

i i 检测方法 (15)

p q

2.4 本章小结 (16)

第3章谐波检测MATLAB仿真电路模型设计 (18)

3.1 电路设计模型 (18)

3.2 本章小结 (19)

第4章仿真分析 (20)

4.1 仿真软件介绍 (20)

4.2 仿真结果分析 (20)

4.2 本章小结 (23)

结论 (24)

谢辞................................................................... 错误!未定义书签。参考文献 (25)

外文资料翻译 (26)