Transient and steady state de-centralized control of large power systems

A robust control scheme is presented which stabilizes a nonlinear model of a power system to a very large class of disturbances that may or may not cause the system to exhibit sustained oscillation. The disturbance can be anywhere in the power system. The control is local or decentralized, in the sense that the control of each machine depends only on information available at the machine, and is derived using Lyapunov´s direct method. The derivation is quite general, permitting a second order representation of the turbine/governor and any generator model. Simulation results are presented which show the effectiveness of the proposed control against instabilities of current importance including sustained oscillations following a major system disturbance such as a fault or major line outage. The control is also effective for steady state operation