Abstract
This paper explores the replacement of the traditional gas turbine auxiliary power unit (APU) of an aircraft with a fuel cell (FC) actively hybridized with a Li-ion battery as energy storage element using indirect coupling with each source having its respective power converter for HVDC bus interfacing. The FC converter maintains the bus voltage whilst supplying average load power, with the current controlled battery converter handling load power transients. A fuzzy logic-based energy management system (EMS) is developed to split the load demand between the sources based on the load current and battery SOC while respecting source constraints. Both sliding mode control (SMC) and type II compensators handle converter level reference tracking. Simulation results on a 1 kW APU shows the EMS exhibiting good transient response with low overshoot as well as respecting source operating constraints.
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