Design Of Stabilizers For Static Var Compensators

Steady-state stability of power systems has long been one of the major concerns for all electric utilities. Power system stabilizers (PSS) are frequently employed for adding system damping. However, in an interconnected power system, the most effective generator for deploying a PSS may lie outside the control of the utility or PSS may not be available on that generator. Static Var Compensator (SVC) is a new fast-acting reactive power control device. It has found many applications in power systems.;Although a SVC is primarily designed to regulate the voltage of the bus on which it is connected, it can also provide damping to the system if a proper stabilizing supplementary control is added to it. Application of SVCs for improving system stability is carried out in this thesis. The research has two major objectives: (i) development of a criterion for selecting the most effective location of a SVC, and (ii) design of an optimal stabilizer for the selected SVC to provide maximum damping for the network.;Locally available signals and the application of supplementary control of SVCs are shown to be very effective in improving the system damping. At first, damping effectiveness is demonstrated on a single machine infinite bus (SMIB) system and later the usefulness of the developed techniques is applied on a complex power system of the Electricity Generating Authority of Thailand (EGAT)