A MPPT strategy with variable weather parameters through analyzing the effect of the DC/DC converter to the MPP of PV system

Abstract In order to achieve the maximum power point (MPP) of photovoltaic (PV) system as quickly as possible and improve the MPPT adaptability to the varying weather conditions, in this paper, a maximum power point tracking (MPPT) control strategy with variable weather parameters (VWP) is proposed. In this strategy, the MPP difference between PV system with and without DC/DC converter is analyzed and used as the theoretical basis of acquiring the MPP control signal. Meanwhile, the direct relationship between control signal and VWP is found out by the curve-fitting technique, which is the key work to implement this proposed strategy. Finally, some simulation experiments show that the proposed control strategy is feasible and available to track the MPP successfully, and has better MPPT performance than conventional perturbation and observation (P&O) method under different weather conditions and than fuzzy control method under fast changing weather conditions.

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