Maximum power point tracking method of photovoltaic power generation system

The invention provides a maximum power point tracking method of a photovoltaic power generation system. The method includes the steps of S1, building a photovoltaic power generation system hardware model; S2, collecting photovoltaic power generation system open-circuit voltage Uoc; S3, sampling the input voltage U(k) and input currents I(k) of the photovoltaic power generation system; S4, calculating the voltage variation, current variation and step size variation of the photovoltaic power generation system; S5, judging the voltage variation and the current variation, and using different manners to adjust the step size variation of a conductance increment method so as to adjust the input voltage of the photovoltaic power generation system to allow the actual working power point of the photovoltaic power generation system to be close to the maximum power point. By the method, the tracking response time of an MPPT control module is further reduced, sharp attenuation of input power is avoided, fluctuation of out