T. Das

Publications (2)1.77 Total impact

• Source

  Available from: rit.edu

  Article: Robust Control of Solid Oxide Fuel Cell Ultracapacitor Hybrid System

  T. Allag, T. Das
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  ABSTRACT: Mitigating fuel starvation and improving load-following capability of solid oxide fuel cells (SOFC) are conflicting control objectives. In this paper, we address this issue using a hybrid SOFC ultracapacitor configuration. Fuel starvation is prevented by regulating the fuel cell current using a steady-state invariant relationship involving fuel utilization, fuel flow, and current. Two comprehensive control strategies are developed. The first is a Lyapunov-based nonlinear control and the second is a standard H _∞ robust control. Both strategies additionally control the state of charge of the ultracapacitor that provides transient power compensation. A hardware-in-the-loop test stand is developed where the proposed control strategies are verified.
  IEEE Transactions on Control Systems Technology 02/2012; · 1.77 Impact Factor
• Source

  Available from: rit.edu

  Conference Proceeding: Robust nonlinear control of fuel cell ultra-capacitor hybrid system

  T. Allag, T. Das
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  ABSTRACT: In this paper we design robust control strategies for a hybrid solid oxide fuel cell ultra-capacitor system. Fuel cell control is established by using an invariant property of fuel utilization within an input-shaping framework. Two control strategies are developed. The first design uses a nonlinear control approach for which we prove the stability of the closed-loop system in presence of system uncertainties. The second uses a standard H_∞ robust control approach. Both strategies enforce the control of State of Charge (SOC) of the ultra-capacitor to a desired level. A hardware-in-the-loop test-stand is developed and experimental results are provided.
  American Control Conference (ACC), 2010; 08/2010