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Design of a Fuel Cell Power Conditioning System for Online Diagnosis and Load Leveling

Nguyen, Thanh-Tuan;Doan, Van-Tuan;Choi, Woojin

  • Received : 2015.07.31
  • Accepted : 2016.01.26
  • Published : 2016.03.20

Abstract

A fuel cell power conditioning system for online diagnosis and load leveling under the condition of varying load is developed in this study. The proposed system comprises a unidirectional boost converter and a bidirectional buck-boost converter with a battery. The system operates in two different modes. In normal mode, the bidirectional converter is utilized for load leveling; in diagnostic mode, it is utilized to control load voltage while the boost converter generates perturbation current to implement the online diagnosis function through in-situ electrochemical impedance spectroscopy (EIS). The proposed method can perform EIS for a fuel cell under varying-load conditions with no influence on the load. The validity and feasibility of the proposed system are verified by experiments, and the design procedure of the proposed system is detailed.

Keywords

EIS;Electrochemical impedance spectroscopy;Fuel cell;Load leveling;Online diagnosis

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