Introduction of New Temperature Dependances of Parameters in a Single-Diode Five-Parameter Model of Solar Panels

The most prominent model for characterizing the solar panel performance is the physical loss mechanism known as the single-diode five-parameter model. This model uses one diode and two resistors to describe the electrical losses inside the solar panels. These two resistors are representing physical losses in solar panel: the series resistance represents the energy dissipated in the form of heat in the electric circuit and the shunt resistance represents the current that takes a shortcut to the end instead of going through the desired wire. In this work, an improvement is proposed over this model by introduction of temperature dependences of series and shunt resistances of the model. More specifically, a linear dependence from temperature is introduced for series and shunt resistances while in the existing models the serial and shunt resistances are considered as constants with temperature change. To show the performance of the proposed approach, in the current article two models are constructed for commercial BP-MSX120 solar panels: one with temperature independent serial and shunt resistances and one with linear temperature dependency of serial and shunt resistances. The output results of these models are compared with the measurement data available in the datasheet of the solar panels under consideration. The analysis of the gathered results shows an improvement in the model accuracy over the existing model and more consistency with the measurement data.