Switching control for power systems with line losses

The control of initial swinging due to large power system disturbances justifies the use of controllers in a full-on full-off mode. Current control designs are based on linear controllers with saturating elements using local feedback signals. The paper develops a switching control strategy for the damping of power system interarea modes using multiple FACTS devices and angle transducers. The design is based on maximising the convergence rate of a system kinetic energy function. The function provides correct analysis of lossy systems so that the the load modulation by static VAr compensators, as well as the damping from controlled series capacitors, can be incorporated. Fast suppression of oscillations using multiple FACTS devices is demonstrated