论文总字数：24558字

摘 要

近年来，人类在各个领域都取得了不错的发展，与之对应的就是各种能。源的消耗持续增加，日益加重的能。源危机和环境问。题要求着我们去发展新能。源来取代传统能源。自古以来，太阳就会发出热量，太阳能在当今被用来发电，它具有传统能。源所不具有的优点，如清洁、环保、便于利用等。为了社会的可持。续发展，世界各地都在研究太阳能发电。在对太阳能研。究的过程中，逆变器技术的发展起到了不可或缺的作用。而好的逆变器和先进。的调节方法更是逆变器发展的重中之重。这不仅能够使逆。变器的功能变得强大，还能提高系。统的效率。

本文先介绍了研发光伏产业的意义、目前的状态及其前景展望，对比了两类光伏并网系统的结构。最终确定本文所研究的是一种两级式正。激并网逆变器，然后给出了两级式正。激并网逆变器的电路原理图。介绍了电路前级有源钳位DC/DC变换器的构成和工作模式，又了解了后级全桥逆变电路的构成和基本运行原理。接着对前后两级电路各元件的取值进行了讨论，由于开关管不能同时导。通，加入了死。区电路，并进行了分析。对比不同的输出滤。波器并加以选取，并仔细研究了控制环节。本文采用了电压控制型开关变换器，介绍了PI调节器。介绍了PWM控制的调。节方式以及单极性调。节和双极性调节。

最后，基于理论分析和研究，在saber中搭建电路仿真图，对前后两级分别进行仿真，并给出了经过PI调节和PWM调制后的输出电压波形以及输出电流的波形，验证了其可行性。

关键词：两级式 有源钳位 全桥逆变 并网逆变器

Design and Research of Two - stage Forward - excited Grid - connected Inverter

ABSTRACT

窗体顶端

With the rapid development of the world economy, human society needs more and more energy, coupled with the constant consumption of traditional energy, forcing the world began to develop new energy sources to replace traditional energy.With the rapid development of the world economy, human society needs more and more energy, coupled with the constant consumption of traditional energy, forcing the world began to develop new energy sources to replace traditional energy.With the rapid development of the world economy, human society needs more and more energy, coupled with the constant consumption of traditional energy, forcing the world began to develop new energy sources to replace traditional energy.With the rapid development of the world economy, human society needs more and more energy, coupled with the constant consumption of traditional energy, forcing the world began to develop new energy sources to replace traditional energy.窗体底端

With the rapid development of the world economy, human society needs more and more energy, coupled with the constant consumption of traditional energy, forcing the world began to develop new energy sources to replace traditional energy.Solar energy for human beings is inexhaustible, with clean, environmentally friendly, easy to use, etc., has become the world's first choice for the development of new energy.In the process of solar energy development and utilization, inverter technology development has played a crucial role.The good inverter topology and control technology is the focus of the development of the inverter, and improve energy efficiency and reduce costs.

This paper first introduces the research background, current situation and development prospect of photovoltaic power generation, and analyzes the structure topology of two kinds of single-phase photovoltaic grid-connected systems,The final use is a two-stage structure of the converter. The latter level is DC / AC full-bridge inverter topology.

窗体顶端

Secondly, the circuit structure of the two-stage forward-connected inverter is given. The working principle of the DC / DC converter is analyzed in detail, and the basic principle of the post-stage full-bridge inverter circuit is analyzed in detail.窗体底端

Secondly, the circuit structure of the two-stage forward-connected inverter is given. The working principle of the DC / DC converter is analyzed in detail.The parameters of the two-stage circuit are designed again. The dead-band circuit and the output filter are designed and the control circuit is introduced in detail.In this paper, a voltage-controlled switching converter is introduced, and the PI regulator is introduced. The basic principle of PWM control and unipolar modulation and bipolar modulation are introduced.

Finally, based on the theoretical analysis and research, the circuit simulation diagram is set up in saber, and the voltage wave.form. and the sampling current. after P.I adjustment and PWM. modulation are given respectively. The feasibility of the circuit is verified.

Key Words: Two-stage;Active clamp;Full bridge inverter;Grid connected inverter

目录

摘 要 I

ABSTRACT II

第一章 绪论 1

1.1光伏发电的研究背景和意义 1

1.2光伏发电的研究现状和未来展望 1

1.2.1国内外光伏产业的发展现状 1

1.2.2光伏发电面临的问题 3

1.3光伏逆变器的现状与结构分类 4

1.4 本文的研究目的和工作要求 6

第二章 光伏并网逆变器的原理 8

2.1 两级式正激并网逆变器的电路结构 8

2.1.1前级DC-DC变换器拓 8

2.1.2有源嵌位正激DC-DC变换器工作原理 9

2.1.3 后级DC-AC逆变器拓扑 13

2.1.4 全桥逆变器工作原理 13

2.2 本章小结 16

第三章 两级式正激并网逆变器的设计 18

3.1 前级有源嵌位DC-DC变换器主电路参数设计 18

3.1.1 主开关管和钳位电容的电压 18

3.1.2 钳位电容的选择 18

3.1.3 变压器的设计 18

3.1.4 输出电感和输出电容的设计 20

3.2 后级DC-AC环节全桥逆变器电路参数设计 21

3.3 输出滤波器的设计 22

3.4 死区电路设计 25

3.5 本章小结 26

第四章 控制技术 27

4.1 SPWM控制技术的原理 27

4.1.1 双极性 SPWM 调制 28

4.1.2 单极性 SPWM 调制 29

4.2 开关变换器的控制 30

4.2.1 电压型闭环控制的组成和工作原理 31

4.2.2 电压型控制的优缺点 32

4.3 PI调节电路 33

4.4 本章小结 33

第五章 仿真实验研究 34

5.1 前级DC/DC变换器主电路仿真设计 34

5.2 后级DC/AC全桥逆变器主电路仿真设计 35

5.3 前后两级联合的两级式正激并网逆变器的仿真 36

5.4 本章小结 37

第六章 总结与展望 39

参考文献 41

致谢 43

第一章 绪论

本章首先介绍了光伏发电的研究目的，又明确了国内外光伏发电的当前状况和未。来走向，然后对近年来对逆变器的钻研和其分类做了详细介绍。在本章末又阐述了本文的具体工作。

1.1光伏发电的研究背景和意义

近年来，社会的发展取得了巨大的进步，与此同时，能源变得越来越少，环境遭到了破坏。传统能源不是无穷无尽的，其不合理使用势必将造成能源稀缺，造成全球生态破坏，为了未来的发展，我们必需研发新型能源。作为可再生绿色能源，太阳能受到了社会的大力欢迎。因此，大力发展太阳能发电技术，为解决能源与经济发展与环境保护矛盾提供了有利的途径。

太阳能够随时、不间断的提供能量。现如今，对太阳的能。量的运用有多种多样的方式，下面将给出说明。

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