It defines the direct optical path length through the Earth's atmosphere, expressed as a ratio relative to the path length vertically upwards, i.e. at the zenith. The air mass coefficient can be used to help characterize the solar spectrum after solar radiation has traveled through the atmosphere. The air mass coefficient is commonly used to characterize the performance of solar cells under standardized conditions, and is often referred to using the syntax “AM” followed by a number. “AM1.5” is almost universal when characterizing terrestrial power-generating panels.
Published in Chapter:
An Accurate and Efficient Analytical Method to Extract the Parameters of the Single and Double Diode Photovoltaic Cells Models
Radouane Majdoul (Hassan 1st University, Morocco), Elhassane Abdelmounim (Hassan 1st University, Morocco), Mohamed Aboulfatah (Hassan 1st University, Morocco), Abd Elwahed Touati (Hassan 1st University, Morocco), and Ahmed Moutabir (Hassan 1st University, Morocco)
Copyright: © 2017
|Pages: 32
DOI: 10.4018/978-1-5225-0773-4.ch020
Abstract
For Photovoltaic systems designers and manufacturers, it is very important to develop suitable models to closely emulate the characteristics of PV cells, predict their behavior and evaluate their efficiency. So the main contribution of this chapter is to propose an improved and accurate method for identifying and determining the equivalent circuit elements values of photovoltaic module using only exact analytical equations and four manufacture's data reference, i.e., the open-circuit voltage (VOC), the short-circuit current (ISC), the current and the voltage at the maximum power point (IM, VM). In order to extract the five-parameter Single or Double-Diode models of photovoltaic module, the authors try initially to determine analytically all parameters according to RS (the value of the series resistance). Thus, all these parameters are calculated once RS is determined. Rapid and iterative algorithm is then designed to solve a strongly nonlinear equation in order to extract the value of RS in a precise manner and without any mathematical simplification used usually by many other authors.