Use of super-capacitor to enhance charging performance of stand-alone solar PV system
Journal
2nd International Conference on Sustainability in Energy and Buildings
Pages
139-147
ISBN
9.78364E+12
Date Issued
2011
Author(s)
Abstract
The battery charging performance in a stand-alone solar PV system affects the PV system efficiency and the load operating time. The New Energy Center of National Taiwan University has been devoted to the development of a PWM charging technique to continue charging the lead-acid battery after the overcharge point to increase the battery storage capacity by more than 10%. The present study intends to use the super-capacitor to further increase the charge capacity before the overcharge point of the battery. The super-capacitor is connected in parallel to the lead-acid battery. This will reduce the overall charging impedance during the charge and increase the charging current, especially in sunny weather. A system dynamics model of the lead-acid battery and super-capacitor was derived and the control system simulation was carried out to predict the charging performance for various weathers. It shows that the overall battery impedance decreases and charging power increases with increasing solar radiation. An outdoor comparative test for two identical PV systems with and without super-capacitor was carried out. The use of super-capacitor is shown to be able to increase the lead-acid charging capacity by more than 25% at sunny weather and 10% in cloudy weather. © Springer-Verlag Berlin Heidelberg 2011.
Subjects
Battery charging; Solar charging; Stand-alone solar PV power; Super-capacitor charging
SDGs
Other Subjects
Battery impedance; Battery storage; Charge capacities; Charging current; Charging performance; Charging techniques; Comparative tests; Control system simulations; National Taiwan University; Operating time; Power increase; PV system; Solar PV systems; Solar PVs; Super-capacitor; System dynamics model; Capacitors; Computer simulation; Photovoltaic effects; Sun; Sustainable development; Charging (batteries)
Type
conference paper