Proton exchange membrane (PEM) fuel cell, a clean and alternative power source, has become a research hotspot in recent years. In general, PEM fuel cell-fed DC motor can only rotate unidirectionally. In this paper, a full-bridge converter is proposed to form PEM fuel cell-fed bidirectional DC motor system, and an adaptive backstepping sliding-mode control (ABSMC) is proposed to achieve the bidirectional angular velocity tracking and bus voltage regulation. The controloriented model of the PEM fuel cell-fed motor system is constructed. The control laws and adaptive laws are developed following the sliding-mode controller with backstepping approach to achieve bus voltage and angular velocity regulations. As a comparison, a traditional PI control is used, and the two controllers are compared through simulations. The results indicate that ABSMC show better control performance under the circumstance of system parameters variations and external disturbances no matter in bus voltage or angular velocity regulation. In particular, the PEM fuel cell can be protected via ABSMC since the controller reduced the impact of the load variation.
Keywords proton exchange membrane (PEM) fuel cell, DC/DC buck converter, DC motor, adaptive backstepping sliding-mode control (ABSMC)