Novel battery charging regulation system for photovoltaic applications

A battery-charging system for stand-alone photovoltaic (PV) applications is presented. Advantages of the proposed method are: better exploitation of the available PV energy by means of a maximum power point tracking (MPPT) technique employed in the control algorithm, increased battery lifetime due to higher level state of charge operation, and the charging control process does not depend on accurate battery current measurements, reducing the effect of the current sensor sensitivity on the battery final state of charge. Also, since it is based on the battery current regulation principle, it can be effectively used with large battery strings. The experimental results verify that, using the proposed method, a better exploitation of the available PV energy, compared to a commercial battery charger based on the on/off principle, is achieved, and simultaneously a 100% battery state of charge is reached in shorter time.

[1]  Eduardo Lorenzo,et al.  Solar Electricity: Engineering of Photovoltaic Systems , 1994 .

[2]  Syed Islam,et al.  A battery management system for stand alone photovoltaic energy systems , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[3]  Andreas Jossen,et al.  Methods for state-of-charge determination and their applications , 2001 .

[4]  Tomas Markvart,et al.  Modelling battery charge regulation for a stand-alone photovoltaic system , 2000 .

[5]  Dirk Uwe Sauer,et al.  Analysis of the performance parameters of lead/acid batteries in photovoltaic systems , 1997 .

[6]  A. K. Pandey,et al.  Design of a battery voltage regulator based on maximum power point tracking and charge equalisation concepts , 1996 .

[7]  D. Linden.  Handbook Of Batteries , 2001 .

[8]  M Fernandez,et al.  Development of a VRLA battery with improved separators, and a charge controller, for low cost photovoltaic and wind powered installations , 2001 .

[9]  Tsutomu Yamazaki,et al.  An advanced solar charging and battery discharge controller unit , 1998 .

[10]  X. F Carelse,et al.  Microcontroller-based charge controller for stand-alone photovoltaic systems , 1997 .

[11]  J.R. Woodworth,et al.  Evaluation of the batteries and charge controllers in small stand-alone photovoltaic systems , 1994, Proceedings of 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion - WCPEC (A Joint Conference of PVSC, PVSEC and PSEC).

[12]  N. Munichandraiah,et al.  Short communication A method to monitor valve-regulated lead acid cells , 1998 .

[13]  J. Dunlop,et al.  Battery charge controller characteristics in photovoltaic systems , 1992, IEEE Aerospace and Electronic Systems Magazine.

[14]  Tore Undeland,et al.  Power Electronics: Converters, Applications and Design , 1989 .