AT89C4051单片机的光伏系统最大功率点跟踪设计+源码
关键词 MPPT 改进扰动观察法 单片机 自动控制
毕业设计说明书（论文）外文摘要
Title The Solar MPPT Control System
Abstract
In recent years, the global energy is becoming less and the environmental pollution is serious increasingly, so the clean and renewable solar energy is receiving attention more and more. How to efficient use of solar energy is the biggest problem facing the people. The domestic and foreign many literature in view of this question proposed realizing the solar cell maximum power point tracking methods.In order to solve this problem, adding the maximum power point tracking (MPPT) controller between the solar cell and load was widely adopted, which led to receiving the purposes of making full use of solar energy.First, the paper article analyzes the principles and characteristics of existing algorithm used in MPPT control respectively, and then proposed the improved method of climbing. This improved algorithm is not only simple and easy to implement, also can effectively avoid two situations of the traditional mountain climbing. On this basis, it research and design a high-reliability and high level of integration automatic control system. This system makes the Buck voltage dropping electric circuit as the main electric circuit, and uses MCU to control. It can first acquisition and processing the solar energy voltage and the electric current data, then carries on the multiply operation, and calculate and compare the maximum power point, at last control the power switch accurately to achieve the MPPT control.
Keywords MPPT improved method of climbing MCU automatic control
目录
1 绪论1
1.1 引言1
1.2 国内外光伏发电发展现状1
1.3 本文研究内容和意义2
2 太阳能电池的特性研究4
2.1 太阳能电池板内特性4
2.2 太阳能电池板外特性5
2.3 太阳能电池板负载特性6
3 实现MPPT控制的方法7
3.1 恒定电压法7
3.2 扰动观察法8
3.3 导纳增量法9
3.4 基于变步长的改进扰动观察法10
4 控制器的硬件设计14
4.1 实现MPPT的原理分析14
4.2 直流变换电路设计15
4.3 控制系统的硬件设计16
5 控制系统的软件编程20
5.1 程序设计主体流程20
5.2 数据采集模块设计21
5.3 数据滤波模块设计22
5.4 PWM程序设计23
结论25
致谢26
参考文献27
附录29
1 绪论
1.1 引言
人类的发展需要大量能源的支持，要实现地球的可持续发展，只能依靠世界科技的进步，大规模地开发和利用可再生的洁净能源。近二三十年来，太阳电池、电力电子及微电子技术的快速发展及人们环保意识的不断增强使得太阳能光伏发电技术得到了持续的发展，光伏发电已经成为利用太阳能的主要方式之一。开展太阳能光伏发电系统的研究，对于缓解能源与环境问题，开拓广阔的光伏发电市场和掌握相关领域的先进技术，具有重大的理论和现实意义。