The design and implementation of voltage stabiliser for nullifying temperature impact on PV array with grid-connected systems

Abstract

In solar power-rich countries like India (especially the south Indian region), temperature variation is not negligible. Usually, a variation from 25°C to 45°C in the day is noticed. On the other hand, the output of a PV array depends on several parameters like ambient temperature, pressure, insolation and configurations. Most of the inverter topologies have recently been introduced to interface to the constant DC voltage source. Practically, in the case of a photovoltaic array, this is not true. However, with variable DC voltage sources, it utilises an electronic equaliser. It requires a large number of components as a consequence of the system's cost and complexity increases. In this paper, a simple stabiliser has been designed and implemented to offset this effect. A simple test system is also designed for this stabiliser. The results based on simulation, experimental and mathematical modelling is also presented. Comparative analysis with existing topologies is also presented here and concludes that voltage variation is due to the change in temperature least. We have also tried to show that by using this stabiliser switching, losses get reduced to 6/7 times as compared with standard temperature conditions.