Design and Implementation of a Digitally Controlled Photovoltaic System using Series Connected Buck Converters

摘要

In photovoltaic (PV) power systems, a maximum power point tracking algorithm is vital in increasing the efficiency of the system. But it is also vital to take into account the non ideal conditions resulting from complex physical environments in such PV power systems. To minimize the degradation of performances caused by these conditions, and therefore adding reliability and robustness, this paper presents an implementation of a digitally controlled system using a topology based on series connected DC-DC buck converters for a stand-alone PV power system applications, operating with local and autonomous controls, to track the maximum power points of PV modules in non ideal conditions. A 1.44kW laboratory prototype is described and some simulation and partial results are presented.