Modeling and Control of Fuel Cell Based Distributed
Generation Systems in a Standalone AC Power Supply
Jin-Woo Jung and Ali Keyhani
Ohio State Univ, Columbus, OH, USA ;
This paper appears in : Journal of Iranian
Association of Electrical and Electronics Engineers
Date: Spring and Summer 2005
Abstract:
This paper develops a circuit
model and controllers of fuel cell based distributed generation systems (DGS) in
a standalone AC power supply. Dynamic model of fuel cell is considered. To boost
low output DC voltage of the fuel cell to high DC voltage and compensate for its
slow response during the transient, two full-bridge DC to DC converters are
adopted and their controllers are designed: a unidirectional full bridge DC to
DC converter for the fuel cell and a bidirectional full bridge DC to DC
buck/boost converter for the battery. For a three-phase Dc to AC inverter, a
discrete time state space model in the stationary dq reference frame is derived
and two discrete-time sliding mode controllers are designed: voltage controller
in the outer loop and current controller in the inner loop. To demonstrate the
proposed circuit model and control strategies, a simulation test bed using
MATLAB/Simulink is developed and various results are given.