Comparison of DC-link Voltage Control Schemes on Grid-side and Machine-side for Type-4 Wind Generation System Under Weak Grid

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Abstract

For the type-4 wind generation system, there is a dc link in the back-to-back converter. Whether the dc-link voltage should be controlled by the grid-side converter (GSC) or machine-side converter (MSC) is still an open question, although it is usually controlled by the GSC. Considering the stability of the system mainly depends on the GSC under weak grid conditions, two typical control methods on the GSC (i.e. power control and dc voltage control) are compared in this paper. It is found that the small-signal stability of these two control schemes are basically the same when choosing the same control loop bandwidths. Even so, the power control scheme is better than the dc voltage control scheme, because a wider range is available for tuning the power loop bandwidth to improve stability. Thus, the dc voltage control carried out on the MSC should be superior to the GSC under weak grid conditions.
Original languageEnglish
Title of host publicationIECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society
Number of pages6
Publication date2021
Pages1-6
ISBN (Print)978-1-6654-0256-9
ISBN (Electronic)978-1-6654-3554-3
DOIs
Publication statusPublished - 2021
EventIECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society - Toronto, ON, Canada
Duration: 13 Oct 202116 Oct 2021

Conference

ConferenceIECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society
LocationToronto, ON, Canada
Period13/10/202116/10/2021
SeriesProceedings of the Annual Conference of the IEEE Industrial Electronics Society
ISSN1553-572X

Keywords

  • small-signal stability
  • dc voltage control
  • power control
  • type-4 wind generation system
  • weak grid

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