A comparison of classical, robust, and decentralized control designs for multiple power system stabilizers

Several control design techniques, namely, the classical phase compensation approach, the mu -synthesis, and a linear matrix inequality technique, are used to coordinate two power system stabilizers to stabilize a 5-machine e quivalent of the South/Southeast Brazilian system. The open-loop system has an unstable intearea mode and cannot be stabilized using only one conventi onal power system stabilizer. Both centralized and decentralized controller s are considered. The different designs are compared and several interestin g observations are provided.