A Nonlinear Decentralized Controller for SVC Considering Supplementary Control Object

Considering the practical decentralized control requests in the application of static Var compensator (SVC) to power system, this paper presents a design method of single-object nonlinear decentralized controller based on inverse system theorem, which only uses local measurable variables. In order to overcome the drawback of single-object control to improve stability of system, the signal of line current as a supplementary control object is introduced into the control system with the single-object nonlinear controller to compose a novel multi-object nonlinear composite controller, which still fulfills the decentralized control requirements. The simulation of the two-area four-machine power system with SVC verifies that the control strategy proposed is superior to the single-object nonlinear controller, which can realize multi-object control to enhance damping of power system low frequency oscillation and improve system stability.