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[转载]【电力电子】【2010.10】二级和三级逆变器分析

已有 274 次阅读 2019-9-18 18:15 |系统分类:科研笔记|文章来源:转载


本文为印度ROURKELA国家技术研究所(作者:PIYUS MOHANTY)的学士论文,共51页。

 

在所需的输出电压和频率水平下将直流电转换为交流电的电力电子装置,称为逆变器。逆变器可以大致分为单电平逆变器和多电平逆变器。与单电平逆变器相比,多电平逆变器具有谐波失真小、EMI/RFI产生量小、可在多个电压电平下工作等优点。多级逆变器正被用于多种用途,如有源电力滤波器、静态无功补偿和用于正弦和梯形电流应用的机器驱动。缺点是多级转换器的每一级都需要独立的电源,而且在软件中也很难构建、成本更昂贵、控制更困难。

 

本课题旨在对三相单电平和多电平逆变器进行仿真研究,本文利用MATLAB/SIMULINK对逆变器在有源电力滤波器谐波滤波中的作用进行了研究和仿真。首先,对具有非线性负载的三相系统进行了建模,并对其特性进行了观测。其次,利用逆变器和合适的开关控制策略(PWM技术)对有源电力滤波器进行建模,实现谐波抑制。

 

The power electronics device which convertsDC power to AC power at required output voltage and frequency level is known asinverter. Inverters can be broadly classified into single level inverter andmultilevel inverter. Multilevel inverter as compared to single level invertershave advantages like minimum harmonic distortion, reduced EMI/RFI generationand can operate on several voltage levels. A multi-stage inverter is beingutilized for multipurpose applications, such as active power filters, staticvar compensators and machine drives for sinusoidal and trapezoidal currentapplications. The drawbacks are the isolated power supplies required for eachone of the stages of the multiconverter and it’s also lot harder to build, moreexpensive, harder to control in software. This project aims at the simulationstudy of three phase single level and multilevel inverters . The role ofinverters in active power filter for harmonic filtering is studied andsimulated in MATLAB/SIMULINK. Firstly, the three phase system with non-linearloads are modeled and their characteristics is observed . Secondly, the activepower filters are modeled with the inverters and suitable switching controlstrategies ( PWM technique) to carry out harmonic elimination .

 

引言

脉冲调制方案

脉宽调制

单相PWM逆变器

不同相位关系的脉宽调制策略

谐波消除中的应用

多级逆变器

结论


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