新型面积差法光伏MPPT

New Area Differential Method on MPPT for Photovoltaic Cells

为了弥补常用光伏最大功率点跟踪方法中存在跟踪速度慢、在最大功率点附近存在振荡及外界环境发生巨变可能产生误判等不足,在分析光伏电池模型及其P-U输出特性曲线的基础上,结合转换效率较高的升压Boost电路,提出了一种基于面积差自适应调节扰动步长的光伏发电系统最大功率点跟踪方法。该方法能够根据面积差的不同实现自适应调节扰动步长。利用Matlab/Simulink仿真软件对提出的方法进行仿真研究,对仿真结果进行分析并与传统的控制方法对比。结果表明,提出的控制方法具有控制简单、跟踪速度快、控制精度高等优点,同时也降低了系统的成本。

To make up the shortfalls of low tracking speed, turbulence near the maximum power point and misjudgment of environmental changes in maximum power point tracking, based on the analysis of photovoltaic cell models and their P-U output characteristic curves, combining with high conversion efficiency boost circuit, a new maximum power point tracking method which adjusts adaptive disturbance step based on area difference is proposed during the research of maximum power point tracking. This method can adjust disturbance step adaptively according to the area difference. The proposed method is simulated by Matlab/Simulink and compared to the traditional control method. The results show that the proposed control method has advantages of sample control, high track speed, control accuracy high, and it also reduces the cost of the system.