Study on SMDO-based sliding mode control for solid oxide fuel cells

SOFC is a electrochemical reaction system with strong nonlinearity. Due to this nonlinear, the pressure of reaction gas fluctuates largely and battery output voltage is difficult to control. To solve these difficult problems, the sliding mode control strategy is proposed, which can ensure pressure of the SOFC system remains constant and then the battery output voltage will keep stable. Firstly, the physical model of SOFC is built, and then sliding mode control strategy is applied on the model; as for the modelling errors and external unknown disturbances, a sliding mode disturbance observer based on super-twisting algorithm is designed to estimate the disturbance, then controller compensate for it. Finally, simulating test is proceed. The simulation results show the controller has a good control effect and it can provide reference for solid oxide fuel cell control.