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    High pulse AC/DC convertors and their application to HVDC transmission.

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    Author
    Villablanca, Miguel
    Date
    1992
    Permanent Link
    http://hdl.handle.net/10092/5741
    Degree Grantor
    University of Canterbury
    Degree Level
    Doctoral
    Degree Name
    Doctor of Philosophy

    AC/DC convertors used in HVdc transmission systems inject harmonics into their associated AC and DC systems. A conventional approach to filter these harmonics is to use passive filters on both AC and DC sides of the convertor. Apart from their technical problems, harmonic filters constitute a considerable part of the volume and cost of present DC terminal stations. Another possible alternative of harmonic suppression is to increase the number of pulses of AC/DC convertors by transformer phase-shifting techniques, but the resulting complicated circuitry together with its problems of insulation produce significant technical and economical disadvantages. In this thesis a novel method of harmonic suppression for HVdc transmission systems is presented. It is a technique producing the same effect as transformer phase-shifting but without complicated circuitry. Moreover, the possibility of increasing the number of pulses of AC/DC convertors to any desired extent is proposed. The concept can be applied to parallel and series connections of convertors. Further applications, other than HVdc transmission, are also suggested.

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    • Engineering: Theses and Dissertations [2155]
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