PHOTOVOLTAIC PUMPING SYSTEMS TECHNOLOGIES TRENDS
Journal Title: Larhyss Journal - Year 2003, Vol 2, Issue 2
Abstract
This paper has reviewed the principle research activity in photovoltaic pumping systems over the past decades. Prior to the common use of power converters, the principle problem was the to find the best matching of DC motors connected directly to the PV array and, naturally such systems were very sub-optimal in that they were unable to utilise the PV capacity. The use of power converters has allowed the extra freedom to exploit the maximum energy capture from the PV arrays. Much of the research focussed on control mechanisms to derive maximum capture (MPPT algorithms) in the presence of variable insolation and array temperature. These methods, ranging from simple constant voltage through to hunting and adaptive techniques have been discussed. Apart from the requirement of adaptability based on the temperature-dependent array characteristics, the MPPT algorithms represent an interesting control problem. This is because the power converter may be viewed as an impedance changer making possible an optimal (and adaptive) impedance matching between the array and the motor-pump load. The dynamics for the control design are then seen to be highly non-linear and represent a good application of fuzzy and neural network techniques. It is of interest to note that other control techniques, such as variable structure and model reference adaptive methods have yet to be applied. However, it may also be observed that the plant structural changes are relatively slow and that the low target bandwidths would tend to make the comparative advantages of various methods somewhat marginal.
Authors and Affiliations
Dr. A. MOUSSI| Research Laboratory in Subterranean and Surface Hydraulics ( Larhyss) University of Biskra, Algeria, A. SAADI| School of Electrical Engineering, University of Nottingham, UK, A. BETKA| School of Electrical Engineering, University of Nottingham, UK, G. M. ASHER| School of Electrical Engineering, University of Nottingham, UK
Keywords
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