A novel two-mode MPPT method for photovoltaic power generation system

A novel two-mode maximum power point tracking (MPPT) method, which combine with short-circuit current (SC) method and perturbation and observation (P&O) method, is presented to reduce the power pulsation around MPP and increase the usage effect of photovoltaic (PV) module. Two methods are used in different PV working points: short-circuit current method and Perturbation and Observation method. The PV module approach to MPP quickly under the control of short-circuit current based on linearity relationship between the short-circuit current and the optimal current of MPP when isolation changes, and then Perturbation and Observation method can make the PV module work near closely to MPP with small power pulsation. A novel method of short-circuit current acquired on line is presented to dissolve traditional SC disturbing the PV module working in this paper. Experimental results reveal that the PV power generation system has good steady performance and transient characteristics under the control of the presented method.