Low Cost and Simple P&O-MPP Tracker Using Flyback Converter

Abstract

: In this paper, a low cost and simple MPP tracker using flyback converter are proposed. First, MPP tracker is defined by a theoretical analysis approach of the relationship between the equivalent resistance, load resistance and duty cycle of the flyback converter. Secondly, based on this way the perturbation of the Photovoltaic (PV) power is determined and then the duty cycle of the flyback converter is adjusting to achieve the maximum power point (MPP) correctly. If the alteration in the power is less than zero, the duty cycle is incremented. On the other hand, the duty cycle is decremented if the alteration in the power is greater than zero until to reach the optimal working point. To verify the performance of this proposed MPP tracker, a PSIM software is utilized to investigate the results of the proposed technique with rapid change in both cell ambient temperature and solar irradiance. In addition, the sample algorithm is written directly using simple C-block code without the need the analogue devices that built the conventional MPP tracker. As present in simulation results, exhibit a fast response in high irradiance level is achieved with small oscillation value. Finally, the oscillation problem around the MPP is avoided using a small perturbation step.