DC-link control filtering options for torque ripple reduction in low power wind turbines

Rafael Pena Alzola, David Campos-Gaona, Peter Ksiazek, Martin Ordonez

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)
280 Downloads (Pure)


Small Wind Energy Conversion Systems (WECSs) are becoming an attractive option for distributed energy generation. WECSs use permanent magnet synchronous generators (PMSGs) directly coupled to the wind turbine and connected to the grid through a single-phase grid-tie converter. The loading produced on the DC-link is characterized by large ripple currents at twice the grid frequency. These ripple currents are reflected through the DC bus into the PMSG, causing increased heating and ripple torque. In this paper, the PMSG inverter is used to control the DC link voltage. In order to avoid reflecting the ripple currents into the PMSG, the feedback DC-link voltage is passed through a filter. The Butterworth filters, notch filters, antiresonant filter (ARF) and moving average filter (MAF) are considered. For a fair comparison, formulas are provided to tune the filter parameters so that DC-link voltage control will achieve the selected bandwidth. The different filtering options produce different levels of torque ripple reduction. Notch Filter, ARF and MAF obtain the best results and there is a trade-off between the filter implementation complexity, bandwidth, overshoot and the torque ripple reduction. Simulations and experiments using a 2.5 kW PMSG turbine generator validate the proposals.
Original languageEnglish
Pages (from-to)4812-4826
Number of pages15
JournalIEEE Transactions on Power Electronics
Issue number6
Early online date4 Aug 2016
Publication statusPublished - 30 Jun 2017


  • lead-lag
  • wind turbine
  • PMSG
  • torque ripple
  • load current
  • filters
  • Butterworth filter
  • notch filter
  • antiresonant filter
  • moving average filter


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