Design and Analysis of 6KW Photovoltaic Power System

In this article, the author designed and analyzed a 6KW photovoltaic power system. The system is composed of a photovoltaic array, a DC-DC converter, an accumulator battery and a DC-AC inverter connected to the load. Staged charging control strategy has been brought up. In the stage of quick charge, the photovoltaic will work with maximum power point tracking (MPPT). In the stage of float charge and overcharge, proportion integral control method is used to realize constant voltage charge, and the detected voltage can be compensated by temperature sampling. According to the results of experiment, the utilization of solar energy has been improved, and the life of the battery has been prolonged too.