Abstract: The fast de-excitation capability of Synchronous Generators (SG) using Standard Brushless Excitation (SBE) system is one of the most challenging problems. Thus, supplementary de-excitation system may be necessary to improve the dynamic performance of the voltage regulation for SG. This paper aims to provide an advanced dynamic de-excitation system based on a de-excitation power structure connected to the rotor winding of the SG and associated with a dedicated de-excitation control strategy. This proposed system consists of an IGBT connected in parallel with a non linear discharge resistor and controlled continuously by a dedicated PID controller to provide a fast dynamic de-excitation during loads rejections or excitation shutdowns. An excitation H∞ voltage regulator is also designed by considering the de-excitation system as perturbations. Consequently, the stability of the system is ensured during the dynamic operation of the discharge system. A comparison between the SBE and the proposed de-excitation system is presented and analyzed. Realistic simulation results show significant improvement in the dynamic regulation of the generator terminal voltage in terms of voltage overshoot, response time and stability.