Design and Implementation of a Novel Photovoltaic Charge System with Maximum Power Point Tracking

Abstract

A novel circuit topology for photovoltaic charge system with high efficiency and complete protection functions was presented in the paper. A modified P&O algorithm for better tracking performance with adaptive step length adjustment was proposed. And a comprehensive strategy for maximum power point tracking (MPPT) combined with the Constant Voltage Tracking (CVT) algorithm and the modified adaptive Perturbation and Observation (P&O) algorithm was developed. A prototype was implemented to very the feasibility of the proposed scheme. The experimental results showed that high MPPT accuracy and high power conversion efficiency were achieved under PWM operation mode.