The use of small alternators, other than for standby purposes, is increasing and this has focused attention on the reliability and utility of the parameters normally quoted for such machines. Test procedures are described and methods used for parameter estimation discussed, with particular emphasis on the difficulties presented by small brushless machines.

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Deregulation of the electric utilities has created unprecedented opportunities for growth in the market for diesel generator sets (of sizes up to 5 MVA). Until recently such plants were used, almost exclusively, for emergency stand-by purposes; but this is no longer the case. In order to extract the maximum benefit from this situation improvements must be made in the control and protection features incorporated in these gensets. TheAutomatic Voltage Regulator (AVR) has a key role in these hture developments. This paper describes the development of a digital AVR which can replace the existing analogue AVRs traditionally used. Further, it describes the application of a fuzzy tuning scheme as an approach to resolving conflicting control requirements.Results of step demand; load acceptance and rejection tests are provided for the comparison of the performance of the digital AVR with that of the traditional analogue devices.

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