Aiming at the practical application of the electric propulsion hybrid power system of a small UAV based on polymer exchange membrane hydrogen fuel cell and lithium-ion battery,a design method of second-order sliding mode hydrogen fuel cell gas supply system based on nonlinear adaptive super-twist algorithm is proposed.Based on the study of the relationship between the air flow rate and the oxygen excess ratio of air compressor in fuel cell gas supply system,a reference model for the relationship between expected air flow rate and optimal expected oxygen excess ratio is established.Based on the reference model,an adaptive super-twisted second-order sliding mode controller is introduced to optimize the performance of the fuel cell gas supply system.The simulation results show that the controller has strong robustness,good transient performance in the case of load changes and parameter uncertainties,and ensures the stability of the controlled system.The optimized compressor power configuration saves 2.7%more energy than the constant compressor power configuration,which verifies the effective performance of the adaptive super-twist second-order sliding mode controller.
关键词
自适应超扭曲算法/燃料电池/供气系统/二阶滑模控制
Key words
adaptive super-twist algorithm/fuel cell/gas supply system/second-order sliding mode control
维普
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