A maximum power point tracking method with ripple current orientation

This paper proposes a novel maximum power point tracking (MPPT) technique on basis of dynamic characteristics of the solar-cell panel with a power electronic converter. The power converter draws a rippled current from the solar-cell panel with designated circuit parameters. Experimental results indicate that the current is constantly out of phase with the voltage when the peak of the rippled current is less than the averaged current at the maximum power point. On the other hand, a phase deviation implies that the peak has reached the maximum power point current. Accordingly, an MPPT method is developed with a detection circuit designed for observing the occurrence of a phase deviation. The MPPT method is implemented on a laboratory solar power system to demonstrate its effectiveness.