The doubly-fed induction machine as an aero generator

Tom Feehally, Judith Apsley

    Research output: Contribution to conferencePaperpeer-review


    Modern aircraft require a robust and reliable supply of electrical power to drive a growing number of high power electrical loads. Generators are driven by a mechanical offtake from the variable speed gas turbine, while a constant frequency AC network is preferred. Here doubly-fed induction machines are advantageous since they can be controlled, through a fractionally rated converter, to decouple electrical frequency from the mechanical drive speed, making control of the network frequency possible. However, the converter must be suitably rated, according to drive speed range, electrical voltage and frequency regulation, and power requirements. This paper develops and validates a simulation model of the doubly-fed induction generator system, which is applied to find the power flow through the machine’s stator and rotor connections over a wide mechanical speed range in order to size the converter. A field orientated control scheme is implemented, to provide stand-alone voltage and frequency regulation across a drive range of ±40% synchronous speed, on a purpose-built 6.6kW hardware test platform. Based on the mechanical speed range of an aero gas turbine and the identified converter sizing, the suitability of a doubly-fed induction generator for aero applications is appraised.
    Original languageEnglish
    Number of pages8
    Publication statusPublished - Sept 2014
    EventIEEE Energy Conversion Congress and Exhibition (ECCE) 2014 - Pittsburgh Convention Center, Pittsburgh, United States
    Duration: 14 Sept 201418 Sept 2014
    Conference number: 21325


    ConferenceIEEE Energy Conversion Congress and Exhibition (ECCE) 2014
    Abbreviated titleECCE
    Country/TerritoryUnited States
    Internet address


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