Health Management for PEMFC System Long-Term Operation Based on Optimal Temperature Trajectory Real-Time Optimization
Qi Li, Tianle Su, Liangzhen Yin, Shuqi Xie, Yi Tan, Weirong Chen, Fei Gao
Abstract
To decelerate the performance degradation of proton exchange membrane fuel cell (PEMFC) in long-term operation, a health management based on optimal temperature trajectory real-time optimization is proposed. To characterize the performance degradation of PEMFC system in long-term operation, the degradation mechanism of electrochemical active surface area (ECSA) for the platinum catalyst is introduced. To achieve high performance of PEMFC system at long-term operation conditions, the contradiction characteristic between health degree (HD) and efficiency must be fully considered. To characterize the relationship between HD and efficiency, a comprehensive evaluation model is proposed. To maintain high efficiency while maintaining high health life of PEMFC, the multiobjective optimization module is used to obtain the optimal temperature trajectory. A temperature dynamic feedback control is carried out by adjusting the pump flow rate to track the optimal temperature trajectory in real-time. Performance testing and comparative analysis are carried out. The final results show that compared with the conventional temperature control method, the proposed method can achieve a higher level of system efficiency output while maintaining a good health state in the long-term operation. The efficiency and longevity of the PEMFC system are improved during the whole life cycle operation.