STABILIZING A MULTIMACHINE POWER-SYSTEM VIA DECENTRALIZED FEEDBACK LINEARIZING EXCITATION CONTROL

A new controller for the generator excitation system is described that uses a combination of feedback linearization and the observation deco upled state space. This creates a controller that can be realistically implemented using only local measurements, and whose performance is c onsistent with respect to changes in network configuration, loading an d power transfer conditions. The control differs in this respect from linear constant-gain controllers such as power system stabilizers, who se characteristics can vary significantly with changes in operating co nditions. The design is well-suited to a multimachine setting, in that it is not based on an infinite-bus approximation. Simulations are per formed on a 38-bus reduced model of the Northeast Power Coordinating C ouncil system and benchmarked against simulations in which automatic v oltage regulators with power system stabilizers are substituted in pla ce of the nonlinear controls.