A fuzzy-logic based auto-scaling variable step-size MPPT method for PV systems

摘要

The judgement equations and variable step-size functions in the auto-scaling variable step-size (ASVSS) MPPT method own the characteristic of auto-convergence. This paper applies these functions as the input variables of the fuzzy-logic theoretical system and through the process of fuzzification, inference, and defuzzification, the MPPT system can achieve the merits of good transient tracking capability and better steady-state property. The advantages of auto-scaling variables of ASVSS method and fuzzy-logic control are integrated so that the performance of the solar system can then be further improved.