Abstract:

In order to meet the gas supply demand of 100 kW high power hydrogen fuel cell engine， the control strategy of supply system is developed. Firstly， the fuel cell stack and the gas supply system are modeled. Based on the controlled object model， the cathode and anode gas supply control strategy of MAP feedforward and PID feedback is designed and developed. The anode purge time is calibrated using the weighted sum of single chip voltage state and system efficiency， the control effect of which deployed in the actual controller is verified through bench test. The results show that rapid response to pressure and flow rate has been achieved in both steady-state and transient operating conditions， resulting in increase in current loading rate to 120 A/s and -170 A/s， with the steady-state and transient control accuracy of anode pressure of 98.93% and 95.10%， and the average range of full power cell voltage of 15 mV， with good consistency. Based on the test data， the state equation of the cathode air supply system is calibrated and established. An air supply scheme with integrated nonlinear disturbance observer and nonlinear controller based on Lyapunov direct method is developed. The MIL test shows that the precise control of the air supply control target is achieved， which provides a theoretical basis for further improving the response accuracy of the control system.

Key words: hydrogen fuel cell engine, system modeling, supply system control, bench test, Lyapunov method