Design of supplementary excitation damping controller for damping SSR based on projective theorem

This chapter proposes a Supplementary Excitation Damping Controller (SEDC) based on projective theorem which is from the perspective of system transfer functions. It discusses the system transfer functions of every natural torsional vibration frequency need to be identified. The chapter describes the corresponding output feedback damping controller based on projective theorem. The simulation results show that the designed SEDC based on TLS-ESPRIT and projective theorem can restrain subsynchronous resonance (SSR) effectively, and the controller order is lower which could be applied to the practical projects easily. SEDC is designed based on projective theorem, and IEEE second benchmark model is built for simulation by PSCAD/EMTDC. The transfer functions of SEDC could be got which are based on projective theorem. The system main vibration mode parameters are identified based on TLS-ESPRIT with and without SEDC. The added SEDC could restrain SSR, which avoids increasing primary equipment and reduces the engineering investment.