论文总字数：20754字

摘 要

随着如今传统能源正在日渐消耗和环境问题的严峻，从而使得可再生能源的发展成为当今时代的研究重点，为了实现可持续发展，减少能源开发对环境的影响，新能源发电是一大趋势[1]。由于光能和风能这些自然能源的产生具有不确定性、间歇性等特点，对发电系统的稳定性、可靠性影响较大，为解决此问题，需要通过储能系统来向电网并网。储能系统要求控制能量双向流动，而双向 DC-DC 变换器是该设备中保证电能双向传递的关键部分。双有源桥式变换器具有高功率密度、控制方式简单、易于实现软开关等优点，这使得其在工业界学术界受到了大量关注。

本文主要研究的是双有源DC-DC变换器，它由高频变压器和两个全桥电路组成，两侧全桥均为可控，可以实现能量的双向流动。其电压电流应力小，能够承受大功率，适用于大功率场合应用，能通过移相控制算法能够实现软开关功能。

本文主要完成了以下几方面的工作:介绍了双有源DC-DC变换器的研究背景、意义和研究现状，阐明了单移相控制和双重移相控制方法下双有源桥式DC-DC变换器的工作原理和模式，通过加入缓冲电容实现开关管的软开关并分析了它的工作原理与过程，最后通过MATLAB进行仿真验证其可实现软开关。

关键词：双有源DC-DC变换器 传统移相控制 双重移相控制 软开关技术 仿真

Simulation and design of double active dc-dc converter based on soft switch

Abstract

With the increasing consumption of traditional energy and severe environmental problems, the development of renewable energy has become the research focus of the current era. In order to achieve sustainable development and reduce the impact of energy development on the environment, new energy power generation is a major trend [1]. Since the generation of natural energy such as light energy and wind energy is characterized by uncertainty and intermittency, it has a great impact on the stability and reliability of the power generation system. In order to solve this problem, it is necessary to connect the power grid through the energy storage system. Energy storage system requires the control of bidirectional flow of energy, and bidirectional dc-dc converter is a key part of the equipment to ensure the bidirectional transmission of energy. Double active bridge converter has the advantages of high power density, simple control mode and easy to realize soft switch, which makes it get a lot of attention in industry and academia.

This paper mainly studies an isolated dual-active dc-dc converter, which is composed of a high-frequency transformer and two full-bridge circuits. The full-bridge on both sides is controllable and can realize the bidirectional flow of energy. Its voltage and current stress is small, can withstand high power, suitable for high-power applications, can be through the phase-shift control algorithm to achieve soft switching function.

This article mainly completed the following several aspects: this paper introduces the dual active DC - DC converter the research background, significance and research status quo, illuminates the single phase shift control and double phase shift control method of dual active bridge DC - DC converter working principle and mode, by adding buffer capacitors achieve soft switch switch tube and analyses its working principle and process, finally through the MATLAB simulation verify its can achieve soft switch.

Keywords: dual-active dc-dc converter; traditional phase-shifting control; dual-phase-shifting control; soft switch technology ; simulation

目 录

摘要 …………………………………………………………………………………………Ⅰ

ABSTRACT…………………………………………………………………………………Ⅱ

第一章 绪论................................................................1

1.1研究背景及意义.…………………………………………………………………………1

1.2双有源 DC-DC 变换器的研究现状..……………………………………………………1

1.2.1 变换器的拓扑结构…………………………………………………………………1

1.2.2 变换器的控制方式…………………………………………………………………2

1.3变换器的软开关技术………………………………………….………………….…….2

1.4软开关技术在变换器中的应用……….…………………………………………………4

1.5本文研究内容及安排...……………………………………………………………………4

1.6本章小结………………………………………………………………………………….5

第二章 变换器的工作模式及原理…..………………………………………………… 6

2.1拓扑结构及其工作原理…………………………………………………………………6

2.2 传统移相控制方法………………………..………………………………………………………………..………….6

2.2.1 单移相（SPS）控制方式 ……………….…………………………………………….………………7

2.2.2 传统移相控制的基本原理 ………………….………………………………………….………………7

2.2.3 传统移相控制的工作模式 …………………….………………………………………….……………7

2.3 双重移相控制方法…………………………………………..……………………………………………………….11

2.3.1 双重移相控制的基本原理……………………..…………………………………………...….….11

2.3.2 双重移相控制的工作模式………………………….………………………………………………14

2.4本章小结………………………………………………………………..…………………………………………….……19

第三章 双有源DC-DC变换器的软开关过程………..………………………………………….….…20

3.1基于双重移相控制下的软开关技术…………………………………………….………………….……20

3.2双有源DC-DC变换器一次侧的软开关实现条件…….……………………………25

3.3MATLAB仿真………….……………………………….…………………….…………………………………………26

3.4本章小结……………………………………………………….………………………………………………………30

第四章 总结与展望……………..…………………....………..………………………………………….….…31

4.1总结……………………………………………………………….………………………………………………………31

4.2展望……………………………………………………………….………………………………………………………31

参考文献………………………..…..…………………....………..………………………………………….….…32

致谢……………………………………………………………….….………………………………………………………………35

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