AN APPLICATION OF PRONY METHODS IN PSS DESIGN FOR MULTIMACHINE SYSTEMS

This paper presents a method of obtaining transfer functions for power-system-stabilizer (PSS) design that results in an accurate reduced-order model of a generator connected to a large system. The method is based on Prony signal analysis and incorporates both local and interarea electro-mechanical oscillatory modes. Two PSS units are designed using the proposed method along with root-locus and sequential decentralized control techniques. The design procedure and results are illustrated using computer simulation of a 27 bus system with 16 generators. The test system was developed to exhibit interarea modes that are comparable to the western North American power system. This presentation provides a new perspective on damping interarea oscillatory modes using PSS units.