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Fault tolerant, variable frequency, unity power factor converters for safety critical PM drives
Author(s): S. Green, D.J. Atkinson, B.C. Mecrow, A.G. Jack, B. Green
Source: IEE Proceedings - Electric Power Applications, Volume 150, Issue 6, 2003 , p. 663 - 672
Type: Article
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The aerospace industry is currently considering a constant voltage, variable frequency supply for aircraft power systems. This variable frequency system is based on a generator directly driven from the aero-engine, in which the frequency is dependent on engine speed. A number of safety critical loads are placed on this system, and it is essential that failure of any one load does not affect the operation of another. The paper develops the concept of fault tolerant input converters for an electric fuel pump. The converters always act as a unity power-factor load, and can tolerate a range of failures, whilst maintaining both the operation of the pump and minimal impact on the electrical supply. Two converter types are proposed and compared for this application. The operation of these two unity power factor converters from a variable frequency supply is demonstrated. The effect of faults in the selected converters on converter operation and the supply itself is then discussed.

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The need for fault tolerance in an aeroengine electric fuel control system
Author(s): B.C. Mecrow, D.J. Atkinson, A.G. Jack, S. Green, J.A. Haylock, J. Coles
Source: IEE Colloquium. Electrical Machines and Systems for the More Electric Aircraft, 1999, p. 9 - 9
Type: ConferencePaper
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There has been extensive research concerning electrical machines and drives for safety critical systems. This work has led to the production of fault tolerant machines which are shown to be capable of operating with a large range of winding and power converter failures. The work reported has concentrated upon an electric fuel pump system. There has been little discussion of the reliability calculations which indicate the necessity of a fault tolerant system. This is partly because the reliability data for both machines and power electronic converters is both incomplete and commercially sensitive. This paper presents those results which are available, showing that redundancy is essential for the case of a main engine fuel pump drive. The most successful design approach has resulted in a multiple phase drive in which each phase may be regarded as a single module. The choice of phase number must be a compromise: high phase numbers increase system complexity, but reduce the overall mass, since the mass of a redundant phase is reduced. This issue is also addressed. (5 pages)

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