本文为印度Rourkela国立技术研究所（作者：SANJEEV BALACHANDRAN）的学士论文，共54页。

本课题主要研究和分析三相多电平逆变器及其不同的拓扑结构。本文的主要目的是研究调制技术，并对它们进行比较，分析它们的优缺点。根据它们的功能分析了它们的应用，例如级联逆变器也可以作为电动汽车电池的整流器/充电器，而汽车则连接到交流电源。

本文研究的三种主要的多电平逆变器是级联H桥、二极管箝位和飞跨电容结构。多电平变换器一词是指可以在逆变器或整流器模式下工作的电力电子电路。多电平功率变换器给人的第一印象是具有大量开关，可能导致复杂的脉冲宽度调制（PWM）开关算法。然而，这一领域的早期发展表明了多电平PWM的相对直接的性质。我们的项目介绍了基本方法，并回顾了一些新的研究，主要方法分为传统的电压源法和电流调节法。本文介绍了几种离散电流调节方法，但由于其本质，谐波性能不如电压源法。电压源法也更容易用于数字信号处理器（DSP）或可编程逻辑器件（PLD）的实现。虽然我们已经讨论了许多拓扑结构和调制方法，但是还可以找到更多的拓扑结构和调制方法。该项目的另一个目标是引入与减少隔离电压源和传感器数量相关的概念。这对于需要多个电压源和了解直流电压水平的高电能质量级联型多电平逆变器具有重要意义。

The present project deals with study andanalysis of three phase multilevel inverters and their different topologies andconfigurations. The main purpose of our study is to study the modulationtechniques and compare them with each other analyzing their advantages anddisadvantages. Their applications have been analyzed according to theirfunctioning such as the cascaded inverter for example could also serve as arectifier/charger for the batteries of an electric vehicle while the vehiclewas connected to an ac supply. In our thesis, the three main multi-levelinverters studied are cascading H bridge, diode clamped and flying capacitorstructure. The term multilevel converter is utilized to refer to a powerelectronic circuit that could operate in an inverter or rectifier mode. Onefirst impression of a multilevel power converter is that the large number ofswitches may lead to complex pulse-width modulation (PWM) switching algorithms.However, early developments in this area demonstrated the relativelystraightforward nature of multilevel PWM. Our project presents the fundamentalmethods as well as reviews some novel research. The methods are divided intothe traditional voltagesource and current-regulated methods. Some discretecurrent-regulated methods are presented herein, but due to their nature, theharmonic performance is not as good as that of voltage-source methods.Voltage-source methods also more easily lend themselves to digital signalprocessor (DSP) or programmable logic device (PLD) implementation. Although wehave discussed numerous topologies and modulation methods, several more can befound. An additional goal of this project is to introduce concepts related toreducing the number of isolated voltage sources and sensors. This can beimportant in the high power quality cascaded multilevel inverters which requireseveral voltage sources and knowledge of the dc voltage levels.

1. 引言

2. 多电平逆变器结构

3. 调制技术

4. 冗余状态选择

5. 结果

6. 结论

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