Conference Paper

A PEMFC/Battery Hybrid UPS System for Backup and Emergency Power Applications

Kunming Univ. of Sci. & Technol., Kunming
DOI: 10.1109/PEDS.2007.4487906 Conference: Power Electronics and Drive Systems, 2007. PEDS '07. 7th International Conference on
Source: IEEE Xplore


This paper presents the development of a proton exchange membrane fuel cell (PEMFC) and battery hybrid uninterruptible power system (UPS) for backup and emergency power applications. A sixty-cell PEMFC stack is employed as the main power source at normal load and a 3-cell lead-acid battery is employed as the auxiliary power of the UPS at overload or during the PEMFC startup. The PEMFC consists of two valves for the hydrogen input and output respectively, a mass flow controller to adjust the hydrogen mass flow, and a pressure sensor to control the hydrogen pressure, and their control units for the management of the whole system. The design procedures of the UPS hybrid system are discussed. Experimental setups are presented and the experimental results verify the performances of the PEMFC/battery hybrid power source and the UPS system under the condition of computer load. The developed UPS system proves to be a cost-effective solution for backup and emergency power applications.

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    ABSTRACT: An inverse KY converter, derived from the KY converter, is proposed herein. And such a converter can be used as a bidirectional converter, whose operating modes are classified into two modes. One is the buck mode and the other is the boost mode. This converter can operate stably between these two modes. In this paper, the detailed illustration of the basic operating principles of the proposed topology is given, along with experimental results to verify its effectiveness.
    No preview · Article · Jul 2009