一种光伏电池最大功率跟踪算法

A MPPT algorithm for PV cell

光伏电池的输出特性呈现非线性,为了确保光伏阵列的输出功率始终在最大功率点上,需要采用适当的控制算法来实现最大功率跟踪。采用固定电压法与变步长电导增量法相结合的方法来实现最大功率跟踪。该方法解决了固定电压法在外界环境剧烈变化时不能工作在最大功率点上,以及电导增量法的动态跟踪速度和稳态输出稳定性不能协调的问题。理论分析证明了该算法的有效性及实用性。

The output characteristics of the photovoltaic cell appear nonlinear, and for ensuring the output power of PV array always on the maximum power point, it requires appropriate control algorithms to achieve maximum power point tracking. Constant voltage algorithm was combined with variable step incremental conductance algorithm to achieve maximum power tracking. This method solved the problem that constant voltage method could not work at the maximum power point when external environment dramatically changed, and that dynamic tracking speed and steady output stability of incremental conductance algorithm could not be reconciled. Theoretical analysis proves the effectiveness and practicality of the algorithm.