Description: PV array output power by the light intensity and temperature changes, the maximum power point tracking (MPPT) technology is widely used in photovoltaic systems. In all the maximum power point (MPP) control strategy, the disturbances observed (P & O) MPPT algorithm due to easy implementation is widely used, but its drawback is that the steady-state operating point by MPP will lead to energy oscillations loss, and in the light intensity or temperature when the poor performance of a mutation in the dynamic response. In this paper, propose a modified variable step disturbance observed MPPT algorithm, this method dynamically adjusted according to operating point step change, with the more traditional fixed-step method, the proposed method can effectively improve the MPPT speed and efficiency, The simulation and experimental results verify the feasibility of this improved algorithm.
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