Composite MPPT Control Algorithm with Partial Shading on PV arrays

The output power of PV (photovoltaic) array is highly nonlinear, time-varying and have multiple local power extreme points in particle shadow, which leads to the failure of traditional MPPT (maximum power point tracking) algorithm. A composite MPPT algorithm is proposed to solve the problem, in which an improved PSO (particle swarm optimization) is combined with an adaptive P&O (perturb and observe) method. The improved PSO algorithm is used to implement the fast search for the approximate GMPP (global maximum power point), and then adaptive P&O method is employed to search accurately, in order to make the PV array work stably at the maximum power point. The MATLAB / Simulink model is established to show that the proposed algorithm can achieve a better MPPT performance under different shadows even when the illumination intensity changes suddenly, compared with the traditional PSO and P&O method.

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