A Novel Method for Parameter Identification of Fuel Cell Equivalent Circuit Model

Abstract

In order to monitor the running state of fuel cell and prolong its service life, fault diagnosis technology has been widely researched. The fuel cell equivalent circuit model (ECM) can easily characterize the water content and membrane drying of the cells which has attracted the attention of scholars. Usually ECM is obtained by electrochemical impedance spectroscopy (EIS), and uses an electronic load for impedance excitation test, then achieves parameter identification through algorithms for fault diagnosis. This paper proposes a novel fuel cell ECM model parameter identification method by constructing a new combined network that the fuel cell ECM is included. It doesn't require an electronic load to provide an excitation, meanwhile it relies on the DC/DC converter's input voltage and inductor current, without voltage and current sensors on the fuel cell side. It uses the least square method to identify this new combined network's parameter. This method reduces the cost of system components and achieves a good test performance.