毕业论文-基于matlab的变频器谐波抑制的仿真研究说明书.docVIP

摘要 本文论述了谐波抑制的意义及思想方法，在此基础上对变频器的拓扑结构进行了系统分类，分析并比较了各种拓扑的结构、工作原理和特点;并且介绍了变频器几种常见的控制和调制技术。以多脉动整流技术和PWM整流技术为对象，研究了变频器输入级即整流电路的谐波抑制方法，深入分析了网侧输入电流谐波分布特性，并且将多重化整流和三电平PWM整流输入谐波与IEEE-519标准进行了比较;对三电平逆变器和功率单元串联式逆变器的输出电压谐波进行了详细的仿真分析，分别给出了逆变电路在不安装其它滤波环节和安装滤波装置情况下的输出电流波形和谐波频谱，并且将输出电压谐波、总谐波畸变率与IEEE-519进行了比较分析。 通过搭建模型，进行Matlab仿真分析，并且与IEEE-519谐波抑制标准进行比较，分别指出了几种典型变频器的谐波特点，为工程应用变频技术方案的选择提供了重要的参考依据。 关键词：变频器；多重化整流；PWM整流；谐波分析；MATLAB仿真 ABSTRACT Voltage converter topologies are summarized in the paper, and then the paper has analyzed the structure, working and characteristics of various topologies. Taking the multi-pulse rectifier technology and Three-level PWM rectifier as study object, the harmonic suppression technology of power converter input，which is also known as the rectifier circuit，are proposed，and have analyzed the net-side current harmonics thoroughly; the comparison between harmonics of voltage converters and IEEE-519 standard are made. Several kinds of converter output topologies are also presented，including transformer-coupled output，power multi-level cell series，Neutral-Point Clamped (NPC)three level inverter, IGBT in direct series high voltage inverter and multiple structures，and have some detailed analysis about the inverter output harmonic，and also provided harmonic content of NPC and power multi-level cell series circuits with and without other filter. And the output voltage harmonics，total harmonic distortion and the IEEE-519 were compared. In this paper，the comparison between harmonics of voltage converters and IEEE-519 standard are made by building models of Matlab simulation. The harmonic features of several typical converters were showed，which will provide an important reference to choose high power variable-frequency technology plan in the project application. Keywords： 摘要 I ABSTRACT II 第一章 绪论 1 1.1 变频器简介 1 1.2 变频器产生的历史背景 2 1.3 变频器的特点 3 1.4 变频器的分类 4 1.5 本论文设计的主要工作 4 第二章 谐波和谐波分析 6 2.1 谐波的基本概念 6 2.1.1 谐波问题的研究现状与发展 6 2.1.2 变频器谐波的概念 7 2.2 谐波分析 7 2.2.1 谐波的危害 7 2.