基于CPA和FSCC的自适应扰动观察法在MPPT中的应用

Application of adaptive disturbance observation method in MPPT based on CPA and FSCC

针对定步长扰动观察法存在的不足,提出一种基于局部短路电流启动的自适应变步长最大功率跟踪方法。该方法将电流扰动(CPA)和局部短路电流(FSCC)结合,利用自适应扰动法调整扰动步长;同时在恒压启动时,引入温度调整系数,计算最大功率点补偿值,从而应对外界环境的迅速变化。文中于MATLAB/simulink建立起80 W光伏发电系统模型,与传统最大功率跟踪方法进行对比实验。实验结果表明:所提出的最大功率跟踪方法使系统具有很好的静、动态性能。

In order to improve the current fast tracking ability,an adaptive variable step size maximum power tracking method based on the FSCC is proposed in this paper to overcome the shortcoming of the fixed step perturbation observation method.This method combines the current perturbation(CPA)with the fractional short circuit current(FSCC)and adjusts the perturbation step by the adaptive perturbation method.At the same time,the temperature adjustment coefficient is introduced to calculate the maximum power point compensation value for the rapid changes.In this paper,a80W photovoltaic power generation system model is established in MATLAB/simulink,and compared with the traditional maximum power tracking method.The experimental results show that the proposed maximum power tracking method gives the system good static and dynamic performance.