Adaptive control of self-humidification PEM fuel cell system based on cathode recirculation
2022-01-0831
03/29/2022
- Event
- Content
- The distribution of the water content and reactant concentration has an important impact on the durability and output performance of the PEM fuel cell system. Especially for a self-humidification fuel cell system, membrane drying or local liquid water accumulation will cause poor output performance and even lead to irreversible damage to the stack. To prolong the stack lifespan and achieve the best output performance, it is important to construct a balanced water circulation in the fuel cell stack by actively controlling external subsystems and optimizing operating conditions. In this study, a three-dimensional model of the fuel cell stack is modeled by the ANSYS fluent where the distributions of stack internal states are calculated and illustrated and the external subsystem such as hydrogen supply subsystem, air supply subsystem and thermal management system are modeled on the MATLAB/SIMULINK platform. With the FLUENT/SIMULINK co- simulation, the internal states of the fuel cell stack under different operating conditions are analyzed. To improve the water distribution in the self-humidification fuel cell stack, the cathode recirculation is adopted to increase cathode inlet humidity and reduce local flooding at high current densities based on an air circulation pump. A fuzzy PID control strategy is applied to control the circulation ratio of air supply system and the results indicate the fuzzy PID control strategy can quickly and effectively adjusting the oxygen concentration and humidity along the channel with the circulation ratio, so that the water distribution inside the fuel cell stack can be improved and the self-humidification fuel cell system is well performed.
- Citation
- Yu, Y., Jiao, J., and chen, f., "Adaptive control of self-humidification PEM fuel cell system based on cathode recirculation ," SAE Technical Paper 2022-01-0831, 2022, .