Wide-area measurements based coordination of SVCs and synchronous generators

This paper presents a new control design method based on wide-area measurements to coordinate generator excitations and static var compensator (SVC) auxiliary controls. A new state space model comprising a multimachine power system and a SVC is first derived. This model clearly shows the interactions between SVC and generator variables. Next, generator excitations and the SVC auxiliary input are synthesized to decouple the subsystems. These control signals utilize remote measurements and compensate the interactions between the SVC and generators. The proposed control strategy provides an additional damping of inter-area oscillations. Therefore, it also enhances the global stability of the power system. The effectiveness of the new control strategy is tested using the Anderson and Farmer four-generator nine-bus power system. Simulation results demonstrate that generator speeds, SVC and generator terminal voltages oscillations are well damped when the coordinating controller is used.