Irradiation and Temperature effects on Modified SEPIC Converter Performance for PV Systems

Abstract

The changing position and nature of the sun due to changes in ambient temperature and irradiance level throughout the day is the main difficulty with photovoltaic (PV) systems. This leads to fluctuations in power levels. Therefore, maximum power point tracking (MPPT) under these conditions is the main challenge. This paper proposes a new approach for directly operating at the maximum power point (MPP) at any value of solar irradiation and cell temperature without applying further mathematical processing to operate at that point. This technique is applied to a PV system containing a high-static-gain modified single-ended primary coil MSEPIC converter, which is characterized by high efficiency and high gain voltage. The performance of this converter is obtained with respect to load and output voltage variation under different climatic conditions in Hebron, Palestine. Solar panel type LG450N2W-E6 is selected as the PV generator in this system with 450 W at 41.1 V at MPP. The proposed model is analyzed and simulated in Matlab/Simulink, and m-file code.