Optimal Control Strategy for Fuel Cell Hybrid Electrical Vehicle
Integrating Multi-stack and Super Capacitor
Abstract
The powertrain configuration can significantly impact on the
efficiency of the Fuel Cell Hybrid Electrical Vehicle (FCHEV), but most
of the previous research pay more attention to the control strategy than
the powertrain structure. In this study, a novel configuration of FCHEV
which integrating dual Fuel Cell Stack (FCS) system and a Super
Capacitor (SC) is proposed, then an optimal control strategy based on
the fuzzy control is introduced to distribute the power requirement
among the energy sources. Further the power distribution to the FCS is
redistributed between the two FCSs through an minimum efficiency-based
control strategy, which can extend the high efficiency region compared
with only one FCS which leads to save hydrogen consumption. The proposed
control strategy can distribute the lower frequency part of the power
requirement to the fuel stack system and reduce the fluctuation of power
supply, which leads to extend the life span of the fuel stack system.
Through Advisor-Simulink and test bench experiment results, the proposed
control strategy can effectively reduce the output power fluctuation of
the FCSs within the range of 200 w/s, and save at least 6% the hydrogen
consumption compared with the system with only one FCS.
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