Load governor for fuel cell oxygen starvation protection: a robust nonlinear reference governor approach

The fuel cell oxygen starvation problem is addressed in this paper using a robust load governor. By regulating the current drawn from the fuel cell, the pointwise-in-time constraints on the oxygen excess ratio and on the oxygen mass inside the cathode are strictly enforced to protect the fuel cells from oxygen starvation. The load governor is designed using a nonlinear reference governor approach. Parameter uncertainties such as those due to imperfect controls of temperature and humidity are handled in the load governor design using a novel approach based on sensitivity functions. Simulation results are included to demonstrate the effectiveness of the proposed scheme. The results are compared with those of a linear filter which has been proposed in the prior literature to achieve similar goals.

[1]  Giorgio Rizzoni,et al.  Supervisory control of fuel cell vehicles and its link to overall system efficiency and low-level control requirements , 2003, Proceedings of the 2003 American Control Conference, 2003..

[2]  E. Gilbert.  Functional expansions for the response of nonlinear differential systems , 1977 .

[3]  Ilya V. Kolmanovsky,et al.  Nonlinear tracking control in the presence of state and control constraints: a generalized reference governor , 2002, Autom..

[4]  Anna G. Stefanopoulou,et al.  Modeling and control for PEM fuel cell stack system , 2002, Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301).

[5]  Alberto Bemporad,et al.  Reference governor for constrained nonlinear systems , 1998, IEEE Trans. Autom. Control..

[6]  January,et al.  Challenges in fuel cell power plant control : The role of system level dynamic models , 2003 .

[7]  Murat Arcak,et al.  A nonlinear observer design for fuel cell hydrogen estimation , 2004, IEEE Transactions on Control Systems Technology.

[8]  Ilya Kolmanovsky,et al.  Fast reference governors for systems with state and control constraints and disturbance inputs , 1999 .

[9]  James Larminie,et al.  Fuel Cell Systems Explained , 2000 .

[10]  A.G. Stefanopoulou,et al.  Control of fuel cell breathing , 2004, IEEE Control Systems.

[11]  Anna G. Stefanopoulou,et al.  Control of Fuel Cell Power Systems , 2004 .

[12]  Huei Peng,et al.  Model predictive control for starvation prevention in a hybrid fuel cell system , 2004, Proceedings of the 2004 American Control Conference.

[13]  Woong-Chul Yang,et al.  Control Challenges and Methodologies in Fuel Cell Vehicle Development , 1998 .