In this study, an interleaved buck converter based static excitation system is proposed for large-scale synchronous generators where thyristor controlled systems are widely used. The proposed system removes the slow response drawback of the thyristor controlled systems even for dynamic load conditions. The finite element analysis based model of the synchronous generator's electromagnetic system is obtained and co-simulations of the modeled generator and proposed interleaved buck converter are performed. Results obtained from simulation results show that, the proposed system offers better performance in terms of step response and inductor current ripple. The simulation results are validated with experimental studies. All measurement, monitoring and control processes have been performed with field programmable gate array called NI CompactRlO platform and Lab VIEW software. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.