MPPT DISTURBANCE METHOD FOR PHOTOVOLTAIC POWER GENERATION SYSTEM

摘要

The present invention relates to an MPPT disturbance method for a photovoltaic power generation system. The photovoltaic power generation system comprises N front-level topologies and one back-level topology, input ends of the front-level topologies being respectively connected to a photovoltaic module, and output ends of the N front-level topologies being connected to an input end of the back-level topology in parallel, characterized in that the MPPT disturbance method comprises a first sub-period and a second sub-period of an MPPT disturbance period; after acquiring, in the first sub-period, an input power P1 before disturbance by the back-level topology, back-level MPPT disturbance is carried out, and a stable input power P2 is acquired after disturbance by the back-level topology; and after acquiring, in the second sub-period, an input power P3 before disturbance by the front-level topology, front-level MPPT disturbance is carried out, and a stable input power P4 is acquired after disturbance by the front-level topology. In the present invention, by means of respectively carrying out MPPT disturbance by means of a front level and a back level, the system is made to have a relatively wide MPPT range, and there is no need to exchange information between the front level and the back level.