Abstract
This paper presents a new simple technique for the design of supplementary excitation system damping controllers to damp all unstable modes of subsynchronous resonance (SSR) oscillations at all series compensation levels. The method is applied to the first IEEE benchmark system for subsynchronous resonance studies. Eigenvalue analysis of the linearized system model and a method based on modal control techniques for approximate placement of undamped eigenvalues proved the effectiveness of the controllers in damping the multimode SSR oscillations, at all series compensation levels, using a speed deviation signal which can easily be measured.
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