基于PI调节占空比的自适应MPPT方法

An Adaptive MPPT Method Based on PI Strategy for Adjusting Duty Ratio

摘要:

最大功率点跟踪(MPPT)技术是提高光伏发电效率的重要途径之一；扰动观测法是MPPT控制中最常用的方法,针对其无法兼顾跟踪速度与最大功率点跟踪过程的震荡问题,提出了一种基于PI调节占空比的自适应MPPT方法,该方法针对占空比采用基于PI调节的自适应策略；通过Simulink建模仿真,与其他方法进行对比分析,结果显示了该方法可显著地提高了最大功率点跟踪的速度与精度。

Abstract:

The maximum power point tracking (MPPT)technology is one of the important strategies to improve the efficiency of photovoltaic power generation. Perturbation and observation method is one of the most commonly used MPPT control algorithms. However, it has the problems of low tracking speed and the vibration at the maximum power point. To solve those problems, an adaptive MPPT method based on PI strategy for adjusting duty ratio is proposed, which uses PI strategy to adaptively adjust the duty ratio for fast achieving accurate maximum power point. Compared with other methods through Simulink simulation, the results demonstrate that the proposed method can significantly improve the tracking speed and the accuracy of the maximum power point.