Prediction of I-V characteristics for Bifacial PV Modules via an alpha-beta single double-diode model

Bifacial photovoltaic (PV) modules show higher output than monofacial PV modules, and therefore, an accurate model is of significance to bifacial PV system management. Traditional bifacial PV models treat the bifacial PV cell as two monofacial PV cells in parallel, and most of these studies do not address the effects of different irradiance and materials at both sides on total output in simulation. This paper presents a simplified bifacial alpha-beta single double diode model. The measurement error rate alpha is proposed to demonstrate deviation between measured data and real data which happens during the I-V or irradiance measurement. A bifacial contribution rate beta is introduced to present the ratio of output from two sides in the total generated current resulting from the different irradiance and materials. The experiment results show that the proposed model obtained the lowest errors compared with existing bifacial PV models.