单相光伏两级并网系统的MATLAB仿真研究

MPPT simulation study based on monophasic photovoltaic grid-connected system

为了寻找更好的实现光伏发电系统最大功率点追踪控制方法,根据太阳电池的内部结构和伏安特性建立了太阳电池的等效电路,利用MATLAB语言建立了太阳电池板仿真模型。在分析已有最大功率追踪方法的基础上,提出了一种基于平均值控制的最大功率追踪方法,并对后级并网逆变电路进行理论分析和仿真实验,实验结果证明了所提出方法具有良好的实用性。通过对并网逆变器的控制实现了低谐波含量、高功率因数的并网要求。

The control method of maximum power point tracking for photovoltaic power system was discussed in this article.The equivalent circuit of solar cells was presented by analyzing internal structure and volt-ampere characteristic of solar cells.The present simulation model of solar cell panel was built using MATLAB language.By analyzing the existing method of maximum power point tracking,a maximum power point tracking method based on average was proposed,and the post-stage grid-connected inverter circuit was analyzed,and the simulation model was presented.The result shows the method is of good practicability.The grid-connected requirement of low harmonic content and high power factor was realized by controlling the post-stage grid-connected inverter.