PowerPC-based Fuel Cell Controller Design And Implementation

Fuel cell with its zero-emission, high energy conversion efficiency, high reliability, and maintainability and many other advantages, is known as the fourth generation device after the hydropower, the thermal power and the nuclear power installations. It is increasingly widespread concern by governments and major companies. Proton exchange membrane fuel cell is due to its low operating temperature and high power density, which becomes the most development of technology. The controller is to protect the fuel cell to work properly, the key to extend the service life and improve reliability. In this thesis, it elaborates the proton exchange membrane fuel cell controller design. The main contents are as follows:This thesis analyzed of the overall structure and principle of the proton exchange membrane fuel cell system, which focuses on analysis of the hydrogen supply unit, the air supply unit and cooling system; the requirements analysis of the proton exchange membrane fuel cell control system. On this basis, there is the comparative analysis of the relevant technical solutions and it proposes microprocessor MPC5554which is fast processing speed, and strong anti-jamming capability, resource-rich interface32-bit PowerPC as known, as the core of the overall control scheme.Design based on the MPC5554controller hardware, including the analog and digital signal acquisition and processing circuit, the solenoid valve drive circuit, the D/A conversion circuit, the over current protection circuit, the communication circuit of SCI and CAN. And describe a variety of circuit design principles and select parameters. For the proton exchange membrane fuel cell in which it is the electromagnetic environment and the importance of electromagnetic compatibility of the system controller, the controller of the hardware circuit board layout planning, layout design and laminated planning principle to study and design of PCB reliability.It focuses on the analysis of the water management significance of the proton exchange membrane fuel cell and impact factors-air humidity. Propose theoretical solutions and select the right solution-enthalpy wheel humidification. Then, according to experimental tests it understands the characteristics of the enthalpy wheel humidifier. On the basis, elaborate the conventional PID control humidity strategy. Finally, according to the time delay characteristics for humidity control, propose optimal control scheme through computer simulation and experiment, select the appropriate control parameters. There is a brief analysis of the control results.Finally, there is the controller software platform of μC/OS-II operating system migration, to build the software platform of MPC5554hardware development. Matlab and Freescale develop the RAppID tool to optimize the control strategy to the code. Using this tool, transform the control strategy to the software.