独立光伏系统最大功率跟踪控制器的实现

Implementation of MPPT controller in independent photovoltaic power system

介绍了在小型独立光伏系统中一种最大功率跟踪器的实现。控制器的主电路采用了降压斩波电路,结构简单,硬件实现方便。控制部分在经典干扰观测方法的基础上对控制方法进行改进,采用变步长跟踪,克服了跟踪速度和跟踪精度之间的矛盾。采用超级电容器作为储能装置,从根本上解决了蓄电池储能的二次污染严重、寿命短、工作温度范围窄等问题。应用MATLAB仿真软件搭建光伏电池模块,并根据改进的干扰观测法建立最大功率跟踪控制器,对超级电容器进行充电。仿真结果表明此控制器跟踪快速有效。

A maximum power point tracking controller in small independent photovoltaic power system was introduced. Buck was used in the control circuit, In the controlling part, a new improved method was used based on the perturbation and observation method that prevented the shortcoming of classical perturbation and observation method. Photovoltaic array model was established by using MATLAB simulation software, and MPPT controller is made based on improved perturbation and observation method. Supercapacitor was charged by the controller. The simulated results prove that the improved method is effective and fast.