固定电压法结合扰动观察法在光伏系统MPPT中的应用

MPPT Control of Photovoltaic Generation System Combining Constant Voltage Method with Perturb Observe Method

本文提出了一种新型的光伏最大功率跟踪(MPPT)控制算法。在综合固定电压法和扰动观测法优缺点的基础上,提出了一种固定电压法和扰动观测法相结合的算法,当外界环境因素发生改变时,先根据固定电压法快速调整占空比到最大功率点附近,然后采用扰动观测法进一步精确求解,对所提出的方法进行了仿真和实验验证,结果表明:所提出的方法可以快速、准确跟踪光伏电池的最大功率输出,提高了能源利用率。

This paper puts forward a new control algorithm of photovoltaic maximum power tracking （MPPT）. At the given light and temperature, solar photovoltaic power generation system has a unique maximum power point （MPP）. In this system, we obtain the maximum power of the solar cell targets as the destination, analyze the equivalent circuit of the solar cell and its common mathematical model, use a maximum power point tracking method that constant voltage method based on Perturbation and observation method and establish the simulation model of the control function with MPPT for PV system. The simulation and experiment show that this method can achieve maximum power point tracking, and improve efficiency of solar cells.