The Load Tracking Control of a Solid Oxide Fuel Cell in a Safety Situation Using Model Predictive Control Theorem
Date Issued
2011
Date
2011
Author(s)
Wang, Ruei-Hong
Abstract
The study investigates integrated Solid Oxide Fuel Cell (SOFC) load tracking system, which adjusts variable load to coordinate different current demand for electricity requirement. Under load tracking, Fuel utilization (Uf) and stack temperature are changed which may make system unstable and decrease stack life.
The thesis aims to develop control strategies for realizing steady operation of SOFC in safety situation under load tracking. In order to avoid stack oxidation by fuel starvation, constant fuel utilization control of hydrogen flow rate is implemented in anode; in cathode, air flow rate is regulated for keeping the stack temperature and preventing from thermal destruction caused by thermal stress. Three control strategies in the cathode, including fixed air excess ratio control, varied air excess ratio control and ideal isothermal control, combining the constant fuel utilization control in anode are realized and compared.
Model Predictive Control (MPC) generally used in chemical engineering has chemical delay characteristics and is suitable for SOFC control. MPC is adopted to design all controllers to predict the system feature and achieve good control performance. Matlab/Simulink is used to realize the dynamic simulation of the integrated SOFC system and the open-loop and closed-loop control characteristics in anode and cathode. As a result, with the proposed control in anode and cathode, the integrated SOFC system can be operated in safety under load tracking.
Subjects
Solid Oxide Fuel Cell (SOFC)
Model Predictive Control (MPC)
Load Tracking
Fuel Utilization (Uf)
Air Excess Ratio (λ)
Temperature Control
Type
thesis
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