一种等比递进的变步长最大功率点跟踪算法

Geometric and gradual perturb step MPPT algorithm

针对光伏电池最大功率点跟踪的常规扰动观察法的不足,分析了最大功率点跟踪过程的特点,提出了一种等比递进的变步长最大功率点跟踪控制方法,该方法不需整定参数,实现简单,移植方便。在Matlab/Simulink下进行了建模与仿真,结果表明该方法能有效避免跟踪的稳态偏差,提高光伏电池的转换效率,且动态响应速度快,使光伏系统具有良好的动态和稳态性能。

Aiming at the shortcomings of perturb-and-observe method for photovoltaic maximum power point tracking,the process of MPPT was analyzed, and a geometric and gradual perturb step MPPT algorithm was presented.Compared with other variable step MPPT algorithm, the new algorithm had no setting parameter and had the performance of simple implementation and easy porting. Its model was established and simulated with Matlab/Simulink. Simulation results show that tracking deviation can be avoided and output efficiency can be enhanced all by the proposed MPPT algorithm. The static and dynamic performance of photovohaic power system was improved.