Line-Interactive UPS Using a Fuel Cell as the Primary Source
Haimin Tao; Duarte, J.L.; Hendrix, M.A.M.
Industrial Electronics, IEEE Transactions on
Volume 55, Issue 8, Aug. 2008 Page(s):3012 - 3021
Digital Object Identifier 10.1109/TIE.2008.918472
Summary:This paper proposes a line-interactive fuel-cell-powered uninterruptible-power-supply system. A three-port bidirectional converter connects a fuel cell and a supercapacitor to a grid-interfacing inverter. The system can operate in both stand-alone and grid-connected modes. Moreover, an active filtering function is integrated into the system. It is shown that a supercapacitor can serve as both an active and a reactive energy storage and can buffer the periodical low-frequency ripple in the requested power. For connecting the system to the utility grid, a high-performance single-phase phase-locked loop that incorporates an orthogonal filter is presented. Resonant controllers for both the voltage and current regulations eliminate steady-state error and implement selective harmonic compensation. Simulation and experimental results are provided to show the feasibility of the proposed system and the effectiveness of the control methods.
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