Abstract
This work proposes a new simplified five-parameter estimation method for a single-diode model of photovoltaic panels. The method, based on an iterative algorithm, is able to estimate the parameter of the electrical single-diode model from the panel’s datasheet. Two iterative steps are used to estimate the five parameters starting from data provided by the manufacturer (nameplate values or I–V curves). The first step permits finding the optimal value of the diode ideality factor A, and the second step allows the calculation of the Rp value to improve the accuracy. A model that takes into account variations in temperature and solar irradiance has been used to validate the behavior of the output parameters. Compared to other estimation work, the proposed method shows the best result in the standard test condition (STC) and with a variable solar irradiance. Indeed, the optimization of the A, Rs, and Rp parameters allows guaranteeing the minimum error between I–V curves obtained from method and datasheet.
Highlights
Solar sources in recent years have experienced a strong growth both in terms of investments and installations
In order to have the best response for all environmental parameters that requires an accurate model of the panels [12]
The MPPT algorithms make use of partially-shaded I–V curves affected by bypass diodes
Summary
Solar sources in recent years have experienced a strong growth both in terms of investments and installations. The use of solar energy will grow rapidly, especially for employment in different applications [2]. For this reason, having a model that accurately describes the behavior of photovoltaic panels is essential for system design. The model must be reliable and accurate to describe the behavior in different environmental conditions better These choices entail possible economic drawbacks, like the wrong forecast of the return on investment [3]. The MPPT algorithms make use of partially-shaded I–V curves affected by bypass diodes Another relevant application deals with the design of electronic circuits directly implemented in the photovoltaic panels able to increase efficiency in partial shading conditions [13]
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