文档介绍：二○一二届学生毕业论文(设计) 存档编号:
毕业论文(设计)
论文题目光伏阵列最大功率点跟踪
(英文)Maximum power point tracing in photovoltaic system
学院物理与信息工程学院
专业测控技术与仪器
姓名周豪
学号 200807202110
指导教师周荣政
2012年 5 月 20号
摘要
随着世界各国经济社会的发展,绿色可持续利用的能源得到越来越多国家的重视,太阳能因为其独特的优势而得到世界各国的广泛青睐。但是因为广泛发电的核心光伏电池受外界环境因素影响较大,其次,光伏电池的光电转换效率普遍较低且价格昂贵,再者光伏发电系统的前期投入较大,为了提高太阳能的普及面,提高效率减少材料所造成的污染问题,必须对光伏发电系统加以有效的控制。本论文着重对光伏阵列常用的几种的最大功率点跟踪控制技术进行了简要的理论分析,并建立了MATLAB 仿真模型,通过实验验证比较相应的控制策略的优缺点。
首先,本文简要的对光伏电池的电气特性进行了分析,建立了光伏电池的仿真模型。同时,对常用的最大功率点跟踪(MPPT)方法:导纳增量法(Incremental Conductance)、扰动观测法(P&O)进行了简要的分析,在实验的基础上并提出了改进的方法:通过模糊控制实现占空比跟踪的方法。总结这些方法各自优缺点,在实际应用中应根据具体环境选择合适的跟踪方法。
然后,本文对光伏发电系统进行了简要分析,光伏发电系统主要核心模块包括光伏阵列、电力电子变换器、储能系统和负载等。本位分析重点侧重光伏电池和最大功率点跟踪,系统其它部分简要提及。
关键词:
光伏电池;最大功率点跟踪;爬山法;电导增量法;模糊控制;MATLAB/SIMULINK仿真;
ABSTRACT
With the green and renewable energy be widely used, solar energy is monly because of its unusual advantages. But the output of photo voltaic (PV) array is influenced by the environmental factors, and PV array have relatively low conversion efficiency and is expensive. In order to reduce the overall system cost and extract the maximum possible solar energy, we should control the PV system effectively. This paper focuses on MPPT control techniques of PV array, analyses the theory particularly, establishes simulation model with MATLAB software, presents control strategies relevantly, and validated by experimental results.
Firstly, this paper analyses the electrical characteristics of PV cell and establishes simulation model, and also monly used MPPT methods, such as Incremental Conductance method、P&O method. And then presents three improved methods: Open Circuit method、Optimal Gradient method、Three-Point parison method. These methods each has his strong point and can be used in different field.
Secondly, this paper analyses posing of the PV system. It posed by PV array、power electronics converters、power storage system and loads.
Keywords:
Photo voltaic cell;MPPT;P&Q ,;Incremental Conductance method,;Fuzzy cont