Improved dynamic average modelling of brushless excitation system in all rectification modes

This study presents an improved dynamic average model for brushless excitation system in synchronous generators. The model is based on an efficient voltage-behind-reactance model of the exciter and the average value modelling of rotating rectifier in all rectification modes. The excitation current is assumed to change at a constant rate during the averaging period. The model is validated through comparison of the proposed average model and the experimental results.