基于变步长扰动观察法的光伏电池最大功率点跟踪

Photovoltaic Array Maximum Power Point Tracking Based on Improved Variable Step P&O

为了提高光伏发电系统的发电效率,本文针对传统的固定步长的扰动观察法跟踪存在的不足,提出了一种新的变步长方法,该方法设定下一步步长正比于光伏电池当前电压值与最大功率点电压值的差值。文章通过在Matlab/Simulink中建立该方法的最大功率点跟踪模型,仿真验证其效果。仿真结果表明,本文所提方法的模型动态性能好,对外界环境的变化有较强的适应性。

In order to improve the efficiency of photovoltaic power generation system, a new variable step perturbation and observation method(P&O) has been put forward in this paper, which solves the shortcomings of the traditional fixed step P&O. The method sets the next step proportional to the difference between the current voltage and the voltage corresponding to the maximum power point of the photovoltaic cell. To verify its effects,the simulation model of the maximum power point tracking is established in the Matlab / Simulink. The simulation results show that,the proposed model has better dynamic performance and stronger adaptability to the changes in the external environment.