摘要本文研究了一种基于Buck变换器的高频链多电平逆变器。该逆变器由直流电源、半桥五电平逆变器、高频变压器、周波变换器、滤波器和输出交流负载组成，可实现两级功率变换和双向功率流，将直流电源与交流负载高频电气隔离，具有输出电压频谱特性好、功率密度高、开关器件的电压应力低等优点。61707

本文首先对多电平逆变器的国内外的发展与现状进行了概述，然后推导出基于Buck变换器的高频链多电平逆变器的拓扑结构和工作原理，并对其控制方式进行分析，最后利用Saber软件进行仿真验证。

毕业论文关键词  Buck变换器  高频链  多电平  逆变器  

毕业设计说明书（论文）外文摘要

Title  Research on High-Frequency Multilevel Inverter Based on Buck Converter                                                

Abstract In this paper, a kind of high-frequency multilevel inverter is proposed on the basis of buck converter. The inverter consists of a DC voltage source, a five-level half-bridge inverter, a high-frequency transformer, a frequency converter, a filter and an AC load. It can realize two levels of power transformation as well as bidirectional power flow. Also, it can isolate the DC power supply and AC load high frequency electrically. In this way, this inverter has good frequency spectrum characteristics of output voltage, high power density, and low voltage stress of switching devices.

This paper first gives an introduction of the development of multilevel inverters both in and abroad. Then the topology and operating principle of a high-frequency multilevel inverter based on Buck converter is presented. Later it analyses the control method of the inverter and finishes the simulation in the end.

Keywords  Buck Converter  High-Frequency  Multilevel  Inverter

1  绪论 1

1．1  课题研究背景及意义 1

1．2  多电平逆变器的发展与应用 2

1．3  低频链逆变技术 3

1．4  高频链逆变技术 3

1．5  本文的主要研究内容 4

2  基于Buck变换器的高频隔离型多电平逆变器技术基础 5

2．1  高频隔离型三电平双Buck直流DC/DC变换器的拓扑结构 5

2.1.1  非隔离型Buck变换器拓扑 5

2.1.2  隔离型Buck变换器——单端正激变换器拓扑 6

2.1.3  非隔离型双Buck逆变器拓扑 9

2.1.4  传统隔离型半桥直流变换器拓扑 10

2.1.5  高频隔离型三电平双Buck直流DC/DC变换器拓扑 12

2.2  高频隔离型三电平双Buck直流DC/DC变换器工作稳态分析 13

3  基于Buck变换器的高频链多电平逆变器拓扑和原理特性 17

3.1  高频隔离型半桥五电平逆变器拓扑 18

3.2  高频隔离型半桥五电平逆变器工作稳态分析 20

3.3  变换器各功率开关漏源极电压分析 26

4  基于Buck变换器的高频链多电平逆变器仿真设计