A new maximum photovoltaic power tracking control scheme based on power equilibrium at DC link

This paper proposes a new simple MPPT (maximum power point tracking) control scheme for A PV (photovoltaic) array based on the principle of power equilibrium at the DC link. In contrast to the typical conventional MPPT scheme based on the so-called mountain climbing method, the proposed scheme needs no detection or calculation of the power and no decision making logic or look up tables, except for several numbers of operational amplifiers. Its operation principle is explained quantitatively. In order to confirm the availability of the scheme, a simulation study using general purpose circuit simulation software PSIM and an experiment have been carried out. Although the stability study and system design are left for future study, the validity of the proposed new MPPT method has been clarified through the simulation and experimental results