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Performance investigation of linear control and nonlinear control based-on flatness approach for a DC link stabilized fuel cell/supercapacitor hybrid power plant

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6 Author(s)
Thounthong, P. ; Dept. of Teacher Training in Electr. Eng., King Mongkut''s Univ. of Technol. North Bangkok, Bangkok, Thailand ; Sikkabut, S. ; Sethakul, P. ; Hinaje, M.
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In this paper, the control approaches of linear proportional-integral (PI) and nonlinear flatness-based estimation for dc link stabilization for fuel cell/supercapacitor hybrid power plants are compared. For high power applications, 4-phase parallel boost converters are implemented with a switching interleaving technique for a fuel cell (FC) converter, and 4-phase parallel bidirectional converters are implemented with a switching interleaving technique for a supercapacitor converter in the laboratory. As controls, mathematical models (reduced-order models) of the FC converter and the supercapacitor converter are given. The prototype small-scale power plant studied is composed of a PEMFC system (the Nexa Ballard FC power generator: 1.2 kW, 46 A) and a supercapacitor module (100 F, 32 V, based on Maxwell Technologies Company). Simulation (by Matlab/Simulink) and experimental results demonstrate that the nonlinear differential flatness-based control provides improved dc bus stabilization relative to a classical linear PI control method.

Published in:

Clean Electrical Power (ICCEP), 2011 International Conference on

Date of Conference:

14-16 June 2011