CONTROLLED SERIES COMPENSATION FOR IMPROVING THE STABILITY OF MULTIMACHINE POWER-SYSTEMS

The application of controlled series compensators (CSCs) to increase t he damping of dynamic oscillations in multimachine power systems is de scribed. A CSC controller design is presented based on a linearised mo del of the power system around a given nominal operating point. The po le placement techique is used for calculating the controller feedback gains. A procedure for determining an optimum location for installing a CSC in a power system to provide the most effective damping is inves tigated. A technique for coordinating CSCs when it is necessary to use more than one CSC in a power system is also discussed. Computer simul ations are used to demonstrate the effectiveness of CSCs in increasing the damping of power system dynamic oscillations. A simple power syst em with nine buses and three synchronous machines is used to demonstra te the design procedure.