Nonlinear Decentralized Control of Large-Scale Power Systems

This paper describes an application of nonlinear decentralized robust control (Guo et al., 1998) to large-scale power systems. Decentralized power controllers are designed explicitly to maintain transient stable closed-loop systems. For the first time, nonlinear bounds of generator interconnections are used which achieves less conservative control gains. The proposed controllers are robust with regard to uncertain network parameters and attenuate the persistent disturbances in the sense that the L 2 -gain from the disturbance to the power frequency is reduced to a certain level. Simulations on a two-generator infinite bus power system exhibit enhancement of system transient stability at different conditions of operation points, fault locations and network parameters. Keywords: Large-scale systems; decentralized control; multimachine power systems; transient stability. 1 Introduction Power systems are modelled as large nonlinear highly structured systems. Conventional linear control ..