摘要太阳能是一种新兴的绿色能源，以其取之不竭、用之不尽、无污染等优点，受到人们越来越多的重视。光伏发电是充分利用太阳能的一种有效方式。本文对目前国内外的光伏发电系统利用情况进行了总结，具体分析太阳能发电的基本原理，系统的组成以及分类，从光伏电池的模型开始，对光伏电池的输出特性进行了仿真分析，得出了电池的输出功率曲线变化趋势。比较分析了三种常用的DC-DC 变换器（Buck、Boost、Buck-Boost）的工作原理，利用Boost 型DC-DC 变换器实现转换，并通过Matlab 仿真实验进行了验证。分析了光伏电池最大功率点跟踪的各种控制算法，研究它们各自的最大功率跟踪控制原理，并分析各自优缺点，最后在光伏发电系统最大功率跟踪中运用了模糊控制技术。65985

毕业论文关键词  光伏发电  DC-DC 变换器  最大功率点跟踪  MATLAB仿真

毕业设计说明书（论文）外文摘要

Title  Analysis and design of a novel DC converter of PV system

Abstract

With the development of photovoltaic(PV)technologies, applications of photovoltaic have grown rapidly, indicating that the photovoltaic are attractive to produce environmentally benign electricity for persified purposes. this thesis focuses on the PV power generation systems, which includes modeling of PV systems, maximum power point tracking(MPPT)methods for PV arrays.The modeling of PV arrays is the base of research on PV systems. This thesis presents simulation model of PV arrays based on the output characteristics formulas. It can be directly applied in circuit simulation and system analysis. Maximum Power Point Tracking(MPPT)method is an important means to improve the system efficiency of PV power generation system. MPPT theory and various MPPT algorithms are introduced in the literature. Furthermore, this article analyzes the principle of boost circuit and impedance transformation characteristic in stand-alone PV system with MPPT technology applications. The simulation study of boost circuit applied in the MPPT is completed based on Simulink-simulation model. In this paper, the technology of fuzzy control is applied to the system, but also has very good effect.

Keywords  Solar Energy  DC converter  MPPT  Matlab/Simulink-Simulation

目  次

1  绪论 1

1.1  课题背景及意义 1

1.2  光伏产业的现状及发展 1

1.3  本文研究内容 3

2  光伏发电系统和光伏电池 5

2.1  光伏发电系统的构成和分类 5

2.2  光伏电池的原理特性 6

2.3  光伏电池建模仿真 9

2.4  本章小结 13

3  直流变换器的选择 14

3.1 典型的DC-DC 变换电路 14

3.2  BOOST 升压变换器工作原理 15

3.3  BOOST 升压变换器的仿真 17

3.4  本章小结 19

4  最大功率点跟踪算法 20

4.1 太阳能电池最大功率点跟踪研究的必要性 20

4.2  基于直流变换器的MPPT实现原理 20

4.3  最大功率点跟踪算法