论文总字数：23821字

摘 要

在新的世纪里，全球人口的不断增加，化石燃料的持续消耗，价格持续上涨，导致全球经济增长放缓，世界各国政府达成共识，决定逐步改变能源结构，大力发展可以循环重复利用的能源，走向可持续发展之路发展。社会认为太阳能发展和利用中最有希望的技术之一，逆变技术的发展在其中扮演了重要角色。逆变器拓扑结构和控制技术不仅可以优化逆变器自身的性能，而且可以提高能源利用率，降低成本。

本文使用的是两级式结构电路变换器。前级DC/DC转换器使用的是有源箝位电路，后级DC/AC转换器使用单相全桥逆变的结构。首先提到了利用太阳能来发电的研究背景，现状和发展前景。本文重点讨论了逆变器，研究了逆变器的发展和现状，给出有源箝位正激逆变器的主电路结构。把有源箝位正激工作原理分成8个模态进行了讨论，以及变压器参数做出设定，后级运用了单相全桥逆变电路以完成直流转交流的改变，其中在后级也采用了L滤波电路以使其输出电压的质量满足入网的要求。其次，着重解释了调制的方法。主要是说了单极调制和双极调制这两种。在本文中，分析了优点和缺点，采用单极调制方式。最后又说了逆变器中谐波进行里一些分析，确保入网电流和电网电压相位能在一处，入网电流质量高。

关键词：光伏逆变器 两级式 有源箝位 单相全桥逆变

Active Clamp Forward Inverter Design

Abstract

In the new century, the global population continues to increase, the continued consumption of fossil fuels, prices continue to rise, leading to global economic slowdown, the world governments to reach a consensus, decided to gradually change the energy structure, vigorously develop the energy can be recycled, To the development of sustainable development. Society believes that solar energy development and utilization of one of the most promising technology, the development of inverter technology in which played an important role. Inverter topology and control technology can not only optimize the performance of the inverter itself, but also can improve energy efficiency and reduce costs.

This article uses a two-stage structure circuit converter. The pre-stage converter uses an active clamp circuit, and the post-stage DC / AC converter uses a single-phase full-bridge inverter. First mentioned the use of solar energy to generate research background, status and prospects. In this paper, the inverter is discussed, the development and current situation of the inverter are studied, and the structure of the positive potential inverter is given. The active clamp forward is divided into eight modal states were discussed, and the transformer parameters were set, and the post-stage single-phase full-bridge inverter circuit was used to complete the DC-to-AC change, LC filter circuit to make the quality of its output voltage to meet the requirements of the network. Second, focus on the interpretation of the modulation method. Mainly said that the monopolar modulation and bipolar modulation of these two. In this paper, the advantages and disadvantages are analyzed, using monopole modulation. Finally, said the inverter in the harmonic analysis, to ensure that the network current and grid voltage phase consistent, high quality into the network current.

Key Words：PV inverter; Two-stage; Active clamp; single-phase full-bridge inverter.

目 录

摘要 I

Abstract II

第一章 绪论 3

1.1 课题研究背景及意义 3

1.1.1 课题研究背景 3

1.1.2 课题研究背景 5

1.2 国内外逆变器的发展趋势 5

1.3 光伏并网逆变器的分类 6

1.4 研究现状 7

1.5 本文的主要研究内容 9

第二章 有源箝位正激逆变器设计 10

2.1 光伏并网系统的基础构造 10

2.2 逆变器拓扑结构的选择 11

2.3 有源箝位正激逆变器结构 15

2.4 有源箝位正激逆变器 16

2.5 变压器的参数设计 21

2.6 霍尔采样时k的计算 22

2.7 正激逆变器主电路设计 22

2.8 输出滤波器设计 23

2.9 主电路钳位电容设计 24

2.10 本章小结 25

第三章 控制电路技术 27

3.1 PWM控制的基本原理 27

3.2 SPWM控制原理 27

3.2.1 双极性 SPWM 调制 28

3.2.2 单极性 SPWM 调制 29

3.3 开关变换器的控制 30

3.4 控制方法 30

3.5 对PWM逆变电路中的谐波进行研究 31

3.6 PI调节电路 31

3.7 本章小结 32

第四章 仿真实验研究 33

4.1 正激逆变器主电路开环仿真设计 33

4.2 正激逆变器闭环电路的设计 33

4.3 主电路与控制电路联合仿真 34

4.4 本章小结 36

第五章 总结与展望 37

参考文献 38

致谢 39

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