基于功率回馈的光伏系统MPPT控制器研究

Research on MPPT Controller for Photovoltaic Generation System Based on Lossless Power Feedback Method

针对传统光伏电池最大功率点跟踪(MPPT)技术变负载和环境条件下太阳能利用率低的缺点,根据光伏电池的动态输出特性以及闭环MPPT技术,在对MPPT控制器光伏电池组件进行理论和实验分析的基础上构建了Boost MPPT硬件电路,搭建了光伏发电系统试验台,设计了基于无损功率回馈法的MPPT控制器,进行了该控制策略与传统控制策略的传输效率对比研究,并将这种改进策略应用在光伏发电的最大功率追踪系统中。实验结果证明了该控制方法在提高变换器传输效率方面的作用及其在光伏系统应用中的优势。

For the shortcomings of low-utilization of photovoltaic cells in the traditional maximum power point tracking（MPPT）algorithm,a MPPT controller based on the lossless power feedback method is built up according to the dynamic output characteristics of PV cells and closed-loop（MPPT）technology.The hardware circuit of Boost-MPPT controller is designed based on theory and experimental analysis of PV cells,and the transmission efficiency comparison between this improved power feedback method and conventional method is researched.This improved power feedback method is applied to PV MPPT system according to the characteristics of PV cells.The experimental results prove that power feedback method is effect at improving transmission efficiency of MPPT controller and its application advantages at PV system.The experimental results verify the controller is wonderful in the control effect.