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Study and Implementation on Batteries Charging Method of Micro-Grid Photovoltaic Systems

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DOI: 10.4236/sgre.2011.24037    8,307 Downloads   14,797 Views   Citations

ABSTRACT

In the micro-grid photovoltaic systems, the random changes of solar radiation enable lead-acid batteries to experience low SOC (State of Charge) or overcharged for periods of time if directly charged with such traditional methods as decreased charging current, which will reduce lifetime of batteries. What’s more, it’s difficult to find a proper reduction coefficient in decreasing charging current. To adapt to the random changes of circumstance and avoid selecting the reduction coefficient, a new fast charging method named decreased charging current based on SOC is proposed to apply into micro-grid photovoltaic systems. It combines batteries’ SOC with the maximum charging voltage to determine the charging rate without strictly selecting reduction coefficient. By close-loop current control strategy and related scheme, the experiment proves the new method is feasible and verifies that, comparing with decreased charging current, the improved method make batteries’ SOC reach 100% in shorter time as well as the temperature of batteries raise more slowly.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

T. Wu, Q. Xiao, L. Wu, J. Zhang and M. Wang, "Study and Implementation on Batteries Charging Method of Micro-Grid Photovoltaic Systems," Smart Grid and Renewable Energy, Vol. 2 No. 4, 2011, pp. 324-329. doi: 10.4236/sgre.2011.24037.

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