ENHANCEMENT OF DYNAMIC STABILITY BY COORDINATED CONTROL OF STATIC VARCOMPENSATORS

An analytical tool to assess the influence of large-scale static VAR c ompensation on system dynamic stability is presented. A linear state m odel of an electric power system is developed which considers the repr esentation of synchronous machines and controllable static VAR compens ation as subsystems of the state model which interact through the netw ork parameters. Interaction characteristics between subsystems are uti lized to help in the comprehension of the role of static compensation on system damping. Based on this concept, compensation hierarchies are defined as some static compensators can influence system-wide damping while others effectively behave as local voltage regulators. This app roach also allows better utilization of control capabilities. The coor dinates setting of system controllers is explored by a dominant eigenv alue optimization technique to supplement information on phase compens ation methods.