Coordinated optimal control for power system stability enhancement

A linear optimal controller is designed to implement Variable Series Compen sation (VSC) in transmission network of interconnected power systems. The p roposed controller is used to dampen inter-area oscillations and enhance po urer system stability. The effectiveness of the linear optimal controller t o properly control such a variable series reactance is demonstrated through mode shapes and digital simulation studies on a two-machine system. The di gital simulation studies are conducted using a PSCAD/EMTDC software package . The mode shapes and simulation results show that the controller contribut es significantly to the damping of inter-area oscillations and the power st ability enhancement.