Improving Lifetime of Fuel Cell in Hybrid Energy Management System by Lure-Lyapunov Based Control Formulation - 2017


Fuel cell (FC) is emerging as a clean and nonpollutant energy source and is being used widely in most of the transport and microgrid applications. However, bound applications demanding quick dynamic response are limiting usage of FC on account of its lifetime issues. Slow dynamic response of FC is not suitable to provide transient load demands, usually arising in electrical vehicles during acceleration and in braking. This paper presents a completely unique control strategy and associated power electronics for such applications. We propose a Lure-Lyapunov-based controller executed in cascade mode for the control of hybrid energy management system of FC and ultracapacitor (UC). In the proposed theme, UC responds to transients in load demand whereas FC takes care of the nominal load bus needs. This combination helps in improving lifetime of FC as auxiliary storage device like UC provides a cushion for sudden transients. The proposed management strategy also helps in maintaining state of charge of UC for higher performance. The inherent nonlinearities in DC-DC converter are efficiently handled by the outer-loop Lure-Lyapunov framework. Mathematical modeling and a symptom for absolute stability of the system is presented. The proposed controller strategy is sturdy by virtue of being passivity based mostly control methodology. The paper also presents analysis of the specified power electronics involving DC-DC converters and inner-loop current management action. The synthesized controller is experimentally validated and the results are presented with their analysis.

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