Decentralised nonlinear H/sub /spl infin// excitation control based on regulation linearisation

Based on a combination of regulation linearisation and H/sub /spl infin// theory, a novel nonlinear robust optimal excitation control for multimachine power systems is presented. The feedback variables of the derived control law are completely local measurements. Simulations performed on a 6-machine system demonstrate that the proposed nonlinear H/sub /spl infin// excitation controller is more effective than other types of excitation controllers for improving both dynamic performance and the stability of power systems suffering from large disturbances. In addition, the H/sub /spl infin// control for a regulation linearisation system is equivalent to a nonlinear H/sub /spl infin// control for the original nonlinear control system in the sense of a type of L/sub 2/-gain.