Coordinating Control Strategy For Power Marching Between The Fuel Cell Hybrid Powertrain And AUV Propulsion System

The Autonomous Undersea Vehicle (AUV) using batteries as its power had to go back to mother ship or seashore for charging frequently. Aiming at the problem that could not endure a long time in underwater navigation, after analyzing the structure and hardware of Proton Exchange Membrane Fuel Cells (PEMFC) AUV, a new energy system, i.e. closed loop circulation fuel cell system, was proposed and designed, which could prolong the underwater navigation time while the displacement of AUV remained unchanged, worked quietly and could maintain the status of AUV while the amount of water varied. PEMFC system need to work inside AUV without supply of air, pure hydrogen and pure oxygen PEMFC was selected, which is called closed loop circulation fuel cell system. Based on the control plan of the closed loop circulation fuel cell system, SIMENS 300 PLC was the core of the controller, a stable hardware was constructed.Based on actual instance establish the mathematical model for PEMFC system, assistant energy system, the propulsion system of AUV and DC/DC switch, lay the foundation for the further studying.This thesis discussed the power marching between PEMFC and AUV propulsion system. Based on chemistry and thermodynamic fluid characteristics of PEMFC, the mathematical model for closed loop circulation fuel cell system was established. The main influence factors for output voltage was analyzed, and a new control strategy by mixing PB arithmetic and fuzzy rules was designed, which allowed to controlling the power matching of AUV propulsion system. Simulation results show that the new control strategy can meet power demand of AUV, and provide the foundation for development of an experiment system. The consumption of hydrogen and oxygen was calculated, a budget of the mass of hydrogen and oxygen was needed before AUV started every new underwater task.This thesis make further efforts to discuss the power marching between the fuel cell hybrid powertrain and AUV propulsion system, a power marching coordinating strategy which based on fuzzy control theory was designed. Aiming at power marching in different mode of AUV, coordinating with power demand and the state of charging (SOC) of battery, controlled the power output of PEMFC and battery. Simulation results show that the new control strategy can meet power demand of AUV, and provide the foundation for development of an experiment system. In the end, had a comparison between PEMFC AUV and Battery AUV, which choice is depended on the underwater task of AUV. Circulating PEMFC system will be a new AIP energy system, enhancing the navigating ability for AUV. The distribute power marching system is validate after modeling, which can meet the technology standard of AUV, lay the foundation for PEMFC AUV.