Abstract:
A computer model of brushless excitation system for lar~e
alternators has been developed. The model is based on detail
understanding of principle of its operation under varying
terminal conditions. The exciter-alternator is simulated by fivewinding
representation as suggested by Canay and the rectifier
unit 1S modelled on the basis of analytical . express10ns
representing different mode of operations. Each module of. the
brushless excitation system has been joined together to form a
complete model which can easily be rearranged to simulate a
particular condition.
Responses of brushless excitation system under both
transient and steady state condition have been simulated. The
result of the developed model is compared with test response and
found to have good agreement. The outcome of the model 1S also
judged against IEEE model and the model developed is ranked to be
a superior one. In this respect the shortcomings of the IEEE
model are also pointed out. The work presented in this thesis
would form a basis of modelling alternators having brushless
excitation systems.
