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Analysis of Battery Lifetime Extension in a Small-Scale Wind-Energy System Using Supercapacitors

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3 Author(s)
Gee, A.M. ; Dept. of Electron. & Electr. Eng., Univ. of Bath, Bath, UK ; Robinson, F.V.P. ; Dunn, R.W.

Due to the variable characteristics of renewable generation, batteries used in renewable-power systems can undergo many irregular, partial charge/discharge cycles. In turn, this can also have a detrimental effect on battery lifetime and can increase project costs. This study presents a method of improving battery lifetime in a small-scale remote-area wind-power system by the use of a battery/supercapacitor hybrid energy storage system. The supervisory control algorithm and hardware implementation are described and projected long-term benefits of the proposed system are assessed by simulation. A representative dynamic model of the overall system, incorporating realistic wind-speed and load-power variations has been developed. An analysis is presented of the potential improvement in battery lifetime that is achievable by diverting short-term charge/discharge cycles to a supercapacitor energy-storage system. This study introduces a method by which supercapacitor energy storage systems and control algorithms can be evaluated and implemented in the application area considered. The composition of a prototype test system is described and experimental results are presented to demonstrate system feasibility.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:28 ,  Issue: 1 )

Date of Publication:

March 2013

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