Decentralised nonlinear H-infinity excitation control based on regulation linearisation

Based on a combination of regulation linearisation and H-infinity theory, a novel nonlinear robust optimal excitation control for multimachine power s ystems 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-infinity excitation controller is more effective than other types of excitation controllers for improving bo th dynamic performance and the stability of power systems suffering from la rge disturbances. In addition, the H-infinity control for a regulation line arisation system is equivalent to a nonlinear H-infinity control for the or iginal nonlinear control system in the sense of a type of L-2-gain.