大功率氢燃料电池高原性能OA

The performance degradation of proton exchange membrane fuel cells(PEMFC)in high-altitude environments was systematically investigated.Comparative experiments were conducted at two locations with different altitudes(plain and plateau environments)to comprehensively assess the performance of the fuel cell under varying environmental conditions.The experimental results indicate that in the high-altitude environment,due to lower atmospheric pressure and oxygen concentration,the peak power of the fuel cell significantly decreased to 85.17 kW from 114.92 kW in the plain environment.In addition,the parasitic power of the air compressor increased significantly,with its share rising from 19.43%to 22.05%,further leading to a reduction in the system's net output power.While the impact on performance is relatively limited under low-load conditions,it is especially significant under high-load conditions,particularly in peak net output power which decreases from 92.57 kW in the plain environment to 66.39 kW in the plateau environment.The main cause of the peak power reduction is insufficient air supply,leading to fluctuations in the voltage of individual fuel cell units,with some cell voltages dropping below the reverse polarity voltage,thereby triggering the reversal phenomenon.Moreover,the changes in air compressor intake parameters in the high-altitude environment was also investigated.The results show that in the high-altitude environment,the air compressor needs to provide a higher pressure ratio and flow rate,which brings its operating range closer to the surge region.