Model Of Proton Exchange Membrane Fuel Cell System Research Articles

Active disturbance rejection control strategy applied to cathode humidity control in PEMFC system

Water management of proton exchange membrane fuel cell (PEMFC) is critical to fuel cell performance. Appropriate PEMFC humidity can not only improve the performance and efficiency of the fuel cell, but also prevent irreversible degradation of internal compositions such as catalysts and membrane. In this paper, a dynamic water management model of PEMFC system is established, and an Active Disturbance Rejection Control (ADRC) strategy is proposed for balancing the cathode humidity of PEMFC. The simulation results show that compared with the traditional proportion integral derivative (PID) control and Fuzzy-PID control, the ADRC strategy can effectively shorten the response time, reduce the overshoot, improve the energy efficiency. Moreover, the performances of PEMFC using ADRC control strategy under different temperature and pressure condition are discussed. Furthermore, the power generation efficiency of PEMFC under ADRC humidity control is 2.36% and 1.48% higher than that of traditional PID and Fuzzy-PID control, respectively.

Nonlinear modeling and identification of proton exchange membrane fuel cell (PEMFC)

The nonlinear autoregressive moving average model with exogenous inputs (NARMAX) approach is employed to analyze time-frequency domains for the proton exchange membrane fuel cell (PEMFC) system. The time-domain nonlinear NARMAX model of PEMFC system is modeled from measured experimental input and output data. The outputs obtained by using the time-domain NARMAX model were confirmed by model validation tests which compare the model's predictive outputs with actual system outputs, in an interactive environment. This provides a potentially nondestructive tool for the modeling of a nonlinear PEMFC system. Then, the generalized frequency response function (GFRF) is employed in the frequency-domain, which is computed directly from the time-domain NARMAX model, to provide information about the types of nonlinearities in a PEMFC. The analysis revealed that the time-domain model provides better parameter estimation and a good forecasting ability. The frequency-domain response function is consistent with actual reaction mechanisms. The results illustrate that the time-frequency domain NARMAX approach can be effectively employed in modeling and identifying of PEMFC system.

A Dynamic Model of PEMFC System for the Simulation of Residential Power Generation

A proton exchange membrane fuel cell (PEMFC) system of residential power generator (RPG) has a different operating strategy from the PEMFC system of transportation application because of its environmental difference. In this study, a dynamic simulation model of the PEMFC system is introduced, which has a model for a turbo blower, a membrane humidifier, two cooling circuits, and a PEMFC stack. The thermal efficiency of the PEMFC system for the RPG is very high because it supplies the electricity and hot water to the house. This study is designed to study the dynamic response of individual components during the dynamic change of current density. In particular, since the operation of the turbo blower is very sensitive at low current density, the parasitic power consumption of the blower is significant. Additionally, the system performance and the operating strategy are also presented.