Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9013
Title: Mitigation of low-frequency current ripple in fuel-cell inverter systems through waveform control
Authors: Zhu, GR
Tan, SC
Chen, Y
Tse, CK 
Keywords: Active method
decouple
fuel cell
low-frequency current ripple
pulsation power
waveform control
Issue Date: 2013
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on power electronics, 2013, v. 28, no. 2, 6222011, p. 779-792 How to cite?
Journal: IEEE transactions on power electronics 
Abstract: Fuel-cell power systems comprising single-phase dc/ac inverters draw low-frequency ac ripple currents at twice the output frequency from the fuel cell. Such a 100/120Hz ripple current may create instability in the fuel-cell system, lower its efficiency, and shorten the lifetime of a fuel cell stack. This paper presents a waveform control method that can mitigate such a low-frequency ripple current being drawn from the fuel cell while the fuel-cell system delivers ac power to the load through a differential inverter. This is possible because with the proposed solution, the pulsation component (cause of ac ripple current) of the output ac power will be supplied mainly by the two output capacitors of the differential inverter while the average dc output power is supplied by the fuel cell. Theoretical analysis, simulation, and experimental results are provided to explain the operation and showcase the performance of the approach. Results validate that the proposed solution can achieve significant mitigation of the current ripple as well as high-quality output voltage without extra hardware. Application of the solution is targeted at systems where current ripple mitigation is required, such as for the purpose of eliminating electrolytic capacitor in photovoltaic and LED systems.
URI: http://hdl.handle.net/10397/9013
ISSN: 0885-8993
EISSN: 1941-0107
DOI: 10.1109/TPEL.2012.2205407
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