Modelling of Electrical Characteristics of Photovoltaic Power Supply Sources

Abstract

The photovoltaic (PV) generators are a major element of PV power systems, characterized by a low conversion ratio. This accounts for the necessity to study the current-voltage and power-voltage characteristics of PV sources in order to obtain maximum power output when there are changes both in the modules themselves and in the environment where they operate. In this paper the classical and the modified single-diode models have been used to model the electrical characteristics of PV cells and modules. Mathcad software package has been used for the modelling. The impact of solar radiation, temperature and shading both on electrical characteristics and on the PV cells and modules efficiency has been studied.

Reliability and vulnerability analysis of solar photovoltaic modules and systems

“…By conventional criteria, this difference is considered to be not statistically significant. A comparison of sample averages using a Student's t test reveals no statistical difference between the average cycles for designs [12]. Could the two designs' averages be the same, but their reliability be quite different?…”

Comparative study of the most efficient maximum power point tracking techniques for a photovoltaic system

“…Some of these models are based on single-diode and two-diode models [13]. Due to simple implementation, less simulation time, and high efficient way for MPPT, the single-diode model is represented as shown in Figure 1, [2,[13][14][15]. The current source Iph represents the module photocurrent.…”

A new theoretical formulation of electrical parameters related to photovoltaic cell maximum power output

“…Electrical parameters are irradiance, temperature dependent parameters and, as a result, their values varies accordingly [1,16]. Since pv cells are a major element of pv power systems, this accounts for the necessity to study the current-voltage and power-voltage characteristics of pv cells in order to obtain the maximum power output when there are changes, both, in the pv modules themselves and in the environment where they operate [13]. Relationships referring to electrical parameter, some of them cannot be expressed explicitly in terms of other parameters like maximum voltage, maximum current, and maximum power output, while some of them can be solved directly by direct substitutions into their related equations such as the short circuit current, open circuit voltage, reverse saturation current.…”

“…Because of the difficulty of finding out some parameters, such as V m , in addition to approximate relations, many modeling methods and techniques have been used such as the computer simulation modeling and algorithms, Newton & Raphson method, math-cad software package for the estimation of electrical parameters under different irradiance and temperature situations [13,11,12,9,7,8]. A classical single diode modeling, using Mathcad software packages, are used to model the electrical characteristics of pv cells such that a pv cell current (I) is calculated as a function of the pv cell voltage (V) and solar radiation power ( P in ) [13]. Laplace integral transform technique is also applied to estimate the efficiency of pv cell as a function of temperature [11].…”