A Study Of Integration On Fuel Cell Power System

The fuel cell system,as a high - efficient and clean power plant,is researched of high integration, showing vital significance of the future design and development of UUV power system. For the dynamic design requirements of UUV,an overall scheme utilizing a fuel cell hybrid design methods is resoning designed with a 10 kW fuel cell primary heap, a 10 kW auxiliary power supply and a solid hydrogen & liquid oxygen storage. By theoretical calculating, the power performance of UUV is better than that of useing 20 kW fuel cell or 20 kW lithium ion batteries.The 10 kW fuel cell system is to use constant pressure closed water circulation and exhaust cycle humidifying based on the integrated consideration. In view of the system and the requirements of some key parameters such as flow, temperature, pressure and so on, the calculation and selection of the system pipeline, solenoid valve, pressure regulating valve,thermostatic valve and the heat exchanger components, meantime, the design of the fuel cycle injector is studied. Combined with the actual size of system selection and space requirements,the integrated model of 10 kW fuel cell system is designed.Using DSP hardware to design a control system of integrated of fuel cell power system,which is more suitable for integration requirements achieving the same control and becoming smaller compared with PLC. Using CCStudio to design programs for the DSP signal acquisition, communication and signal outputs, using serial port to realize the communication between DSP and computer, therefore Lab VIEW is used to write the control interface for real-time status display and control on the computer.Through the experimental verification, results show that the closed-loop water system can achieve a self-adaption of air-water pressure, in the exhaust from the humidification humidification conditions can take an electric stable operation of the stack without external humidification, the method can reduce the complexity of the control system and can be benefit for integration of the whole systems.Further to verify the feasibility of the scheme and the selection, system model is established in the AMEsim software with the actual parameters of the selection device. By simulating the integration UUV power system boot and the operation load fluctuation with the established model, it is verified that the system can be operated stable and safe. Also the excess coefficient impact on the humidification condition is analyzed, as well as the operating characteristic of a fuel injector.