部分遮阴条件下光伏阵列最大功率点跟踪方法

Maximum Power Point Tracking Method for PV Array under Partially Shaded Conditions

在部分遮阴条件下,光伏阵列功率-电压(P-U)特性曲线呈现多峰现象,传统的最大功率点跟踪(maximum power point tracking,MPPT)方法会失效。因此,提出了一种基于电导增量法的全局搜索(Global search based on Incremental conductance,GSINC)方法来实现最大功率点跟踪,该方法保证不会陷入局部最优且不会错过任何极值点。最后通过仿真验证了该算法能快速且准确地跟踪最大功率点,有效提高了光伏阵列输出效率。

Conventional maximum power point tracking （MPPT） methods are ineffective under partially shaded conditions, as the multiple local maximum can be exhibited on the power-voltage characteristic curve. A new control algorithm called global search based on incremental conductance （GSINC） was studied. The proposed algorithm will not fail into the local optimum and not miss any extreme points. Simulation results indicate that the proposed global MPPT algorithm can fast and accurately track the global maximum, thus to improve the photovoltaic （PV） array output efficiency.