Browse Publications Technical Papers 2022-01-5096
2022-11-16

Experimental Analysis of Control Strategies on Air Supply System for Proton Exchange Membrane Fuel Cells 2022-01-5096

Proton exchange membrane fuel cells (PEMFC) are considered an environment-friendly alternative vehicle power in the future owing to their high power density and zero-carbon emission. To research the performance of the air supplied by the PEMFC air system, the PEMFC air system bench composed of an air compressor, cooler, emulated stack, back-pressure valve, and sensors was built. Then, a PEMFC system test bench composed of a hydrogen supply subsystem, stack, air supply subsystem, electronic control subsystem, and cooling subsystem was established. The fuel cell system control parameters and control method are complex due to the coupling and nonlinearity of the air supply system. The strategy composed of a feedforward table and piecewise proportional integral (PI) feedback control strategy was employed to regulate the pressure and flow rate of the air supply system. The air compressor map and the mapping relationship among the air compressor speed, opening of the back-pressure valve, and stack current were obtained by carrying out experiments on the PEMFC air system bench. The results show that the air pressure and flow rate follow the reference value, and the flow error and pressure error are 1.5 g/s and 0.25 kPa, respectively. The proposed strategy can coordinately control the air flow rate and pressure, and it can provide qualified pressure and flow rate for the PEMFC stack.

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