Mitigation of low-frequency current ripple in fuel-cell inverter systems through waveform control

Guo Rong Zhu, Siew Chong Tan, Yu Chen, Chi Kong Tse

Research output: Journal article publicationJournal articleAcademic researchpeer-review

179 Citations (Scopus)


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.
Original languageEnglish
Article number6222011
Pages (from-to)779-792
Number of pages14
JournalIEEE Transactions on Power Electronics
Issue number2
Publication statusPublished - 1 Jan 2013


  • Active method
  • decouple
  • fuel cell
  • low-frequency current ripple
  • pulsation power
  • waveform control

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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