基于DMPPT的光伏电池阵列输出特性研究

Study on output characteristic of photovoltaic array based on DMPPT

光伏电池阵列在复杂光照条件下,组件之间会存在电气参数失配问题,导致阵列出力减少。通过分布式最大功率追踪从根本上解决失配问题。通过对光伏模组输出I-U曲线进行特性分析,获取了该特征曲线的关键参数。基于模组特征曲线关键参数,得到复杂光照条件下该串联系列模组的整体简化特性曲线,依据简化特性曲线,可有效预估出最大功率点电压范围,对系统设备元件参数设置和元件间匹配提供参考,同时可避免系统工作在次优点,准确获取最大功率。

The complicated illumination existing in the array of photovoltaic panels could lead to a mismatch of electrical parameters between the photovoltaic modules, resulting in reduced power output of the system. Distributed maximum power point tracking method was used to fundamentally solve the mismatch problem. In order to obtain the key pararneters of the characteristic curve, the characteristic analysis of output circuit I-U curve from the PV module needed to be done. Based on these key parameters, simplified equivalent characteristic curve of the sedes of photovoltaic component with complicated iUumination could be got. Based on the simplified characteristic curve, the working voltage range of the maximum power point could be effectively forecast to provide reference for the setting and matching of the system components＇ parameters. At the same time, to avoid the system working in the local optimum point, the maximum power point could be obtained accurately.