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AbsRocGWith rise in the number of commercial and industrial companies using diesel generating sets to maintain the continuity or reduce the cost of their electricity supply, a more sophisticated control of the generator is sought. Traditionally analogue technology has been employed to provide generator speed and excitation control however by employing digital technology, much improved generator control can he achieved. This paper is concerned with the implementation of a digital PID governor. The results show that with even a simple digital PID control algorithm and the tuning there off, the ease of tuning can be improved via computer simulation and that the controller itself can match and out perform its analogue counterpart. The ultimate goal of the work is the integration of the governor and Automatic Voltage Regulator. By using modern control techniques such as Fuzzy logic, full integration of the two controllers is sought and hence U more intelligent generator control system.

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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.