CES Power Electronics and Control_Ashton.ppt
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High Temperature Fuel Cell (SOFC) Based Auxiliary Power Unit Workshop Power Electronics and Control Robert Ashton, PhD 11-12 August 2008
PDM3 SOFC APU Objective Develop and demonstrate a modular, compact, high temperature fuel cell system which provides high efficient, silent power for soldier and APU applications.
Fuel Cells Systems as Military Power Source
| High efficiency at partial load |
| Easy Partitioning for optimized operations |
| Quiet operations |
Fuel Cell Generators Created Through Balancing Systems Oxygen Processing System Fuel Processing System Water Management System Thermal Management System Fuel Cell Stack Balance Electrical Processing System Waste Energy Recovery System System Controller
Sample Required Transient Response
| Mil Specs written around rotating prime mover and generator |
| Transients may require Energy Storage for electrical transients |
Power Electronic Ramification
| Fuel cell stack provides load power |
| Energy storage source provides load power |
| Optimize fuel cell and energy storage systems |
SOFC System Tradeoffs Sample Parameters: FC Size, ES Size, Operating Temperature, Affordability, Robustness
Fuel Cell APU System Models Eventually they need to account for all the systems
Hardware in the Loop Testing Will be used for System Optimization
Sample PEM System Requirement
| 65kW @ 216V and 300A |
| Slow Loading of FC Stack (4 sec) |
Low Ripple for Improve Stack Life (1% @100Hz)
PEBB for Linear Loading
Figure 1 – Powerex PEBB
System Model for Linear Load
PEBB Ramping Load
Stack Voltage Load Voltage Inductor Current
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