Passivity Sliding Mode Control of Large-Scale Power Systems

In this brief, a sliding mode (SM) decentralized excitation controller for multimachine power systems is designed to stabilize the speed and regulate the terminal voltage of each generator in the system. To achieve the speed stabilization, a sliding manifold is designed using the passivity technique. An integral SM controller is proposed to reject internal and external perturbations, taking advantage of the energy properties of the power systems, in the SM motion on the designed manifold. Then, an SM voltage regulator is included in the control scheme, and a logic control is formulated to manage two proposed control laws for the speed and terminal voltage. Finally, to estimate the unmeasured rotor fluxes a nonlinear observer is designed. The proposed control scheme was tested through simulation on an equivalent of the Western System Coordinating Council under small and large perturbations.