Enhancement of power system transient stability using a novel adaptive backstepping control law

In this paper a novel non linear feedback excitation controller has been proposed for improvement of transient stability of power systems. The design of the controller is based on the adaptive backstepping control principle. The controller takes into consideration system uncertainties. A significant merit of this non linear controller in comparison with existing non linear excitation control schemes is its ability to maintain transient stability even under the occurrence of large disturbances, such as a 3-phase fault at the generator terminals. Another advantage is that the proposed technique does not require the existence of a solution of a designed algebraic Riccati equation unlike the controllers based on the robust nonlinear Direct Feedback Linearization (DFL) technique. Simulation results show the rapid convergence of the power angle and the rotor speed to their equilibrium values following the occurrence of a large sudden fault.