Minimum DC link Voltages for the Generator Bridge Converter of a SCIG Based Variable Speed Wind Turbine with Fully Rated Converters

Authors

  • U.I. Dayaratne Author
  • S.B. Tennakoon Author
  • J.S. Knight Author
  • N.Y.A. Shammas Author

DOI:

https://doi.org/10.24084/repqj09.404

Abstract

Squirrel Cage Induction Generator (SCIG) based variable speed wind turbine with Fully Rated Converters (FRC) is a popular choice in the industry for the modern multi megawatt wind turbines. Typical FRC system uses a fixed DC link voltage that allows operation in all steady state and dynamic operating conditions while allowing the modulation index of the PWM scheme to vary. However, the analysis made in this paper shows that at steady state, in the maximum power point tracking region where the turbine is operated at variable speeds with generator controlled using Rotor Flux Oriented Control (RFOC), it is possible to operate the Generator Bridge (GB) converter with significantly lower DC link voltages than the fixed value used, by maintaining maximum modulation index in the PWM scheme. This paper presents a methodology of determining the minimum DC link voltages for such a system supported by simulation results showing the successful operation of a GB converter with minimum DC link voltages in the maximum power point tracking region.

Author Biographies

  • U.I. Dayaratne

    Faculty of Computing, Engineering and Technology Staffordshire University Beaconside – Stafford, ST18 0AD (United Kingdom) Phone number: +44 1785 353488, e-mail: u.i.dayaratne@staffs.ac.uk,

  • S.B. Tennakoon

    Faculty of Computing, Engineering and Technology

    Staffordshire University

    Beaconside – Stafford, ST18 0AD (United Kingdom)

    Phone number: +44 1785 353488,

    e-mail: s.b.tennakoon@staffs.ac.uk,

  • J.S. Knight

    Faculty of Computing, Engineering and Technology

    Staffordshire University

    Beaconside – Stafford, ST18 0AD (United Kingdom)

    Phone number: +44 1785 353488,

    e-mail: n.y.a.shammas@staffs.ac.uk

  • N.Y.A. Shammas

    Faculty of Computing, Engineering and Technology

    Staffordshire University

    Beaconside – Stafford, ST18 0AD (United Kingdom)

    Phone number: +44 1785 353488,

    e-mail: n.y.a.shammas@staffs.ac.uk

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Published

2024-01-17

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Articles