Power Electronic Devices for Damping Torsional Vibrations
نویسندگان
چکیده
Torsional vibrations and resonance problems with synchronous machines are most frequently encountered in rotor systems with long shafts and large inertias constituting a weakly damped mechanical resonator which exhibits a low resonance frequency. It is impossible to obtain a effective mechanical damping for these torsional vibrations, but by using a power electronics device and an inductive or capacitive energy storage which is connected to the stator winding of the synchronous machine, which produce the same effect as an increased natural damping for oscillation mode in the rotating shaft assembly. This electrical method is applicable to torsional vibration problems in generators and electrical drive systems. The paper presents examples for the successful suppression of torsional resonances in synchronous machines of an isolated power system based on flywheel generators and by three phase fault in the second benchmark model of the IEEE.
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