Damping subsynchronous resonance using modal-control NGH SSR damping scheme. I. Single-machine study

This paper presents the results of a study on the application of the NGH SSR damping scheme for suppressing torsional oscillations that occur in the IEEE Second Benchmark Model, system-1. In order to stabilize all the SSR modes, a unified approach based on modal control theory is proposed to design a damping controller which is a dynamic output feedback compensator using generator shaft speed deviation as a feedback signal. To demonstrate the effectiveness of the proposed control scheme, a frequency-domain approach based on eigenvalue analyses and time-domain approach based on nonlinear model simulations are performed. The simulation results show that the proposed modal-control NGH SSR damping scheme can effectively suppress torsional oscillations in the studied system.<>