Residue and identification based wide-area damping controller design in large-scale power system

Low frequency inter-area oscillations are poorly damped in large-scale power systems, although hundreds of local Power System Stabilizers (PSSs) have been installed. Wide-area PSS (WAPSS) with global feedback signals is a novel technique to solve this problem. Because of the global properties, conventional PSS design methods based on detailed mathematical models which are not available for the complicated system are no longer feasible to WAPSS. In this work, an innovative procedure of Wide-area PSS design in large-scale power systems was presented. Feedback signals and locations of WAPSS were first selected, and followed by the identification of the reduced model of the controlled system. Based on the identified model, a residue-based design method of WAPSS was proposed. This approach has been applied to the design of WAPSS in China Southern Power Grid. Results demonstrated the effectiveness of the proposed method.