Multi-Mode Stabilization of Torsional Oscillations Using Output Feedback Excitation Control

The paper presents an output feedback excitation control to stabilize the torsional oscillations due to subsynchronous Resonance of a capacitor-compensated power system. The control design is based on an equivalent mass-spring model, modern control laws, and eigenvalue sensitivity technique. With a multiple signal feedback synthesized from a minimum number of system outputs, the control provides proper damping to all torsional modes. Computer simulation tests show that all oscillating modes can be stabilized simultanously for a wide range of capacitor compensation.