POWER OSCILLATION DAMPING USING CONTROLLED REACTIVE POWER COMPENSATION - A COMPARISON BETWEEN SERIES AND SHUNT APPROACHES

The paper describes how controlled reactive power compensation can be used to damp power systems oscillations. This is of particular interes t in the case of weakly coupled networks. A comparison is made between two kinds of controllable reactive power elements, namely the CSC (Co ntrolled Series Capacitor) and the SVC (Static Var Compensator). The e ssential topics dealt with are efficiency in terms of ''damping effect '' per installed Mvar and the dependence of equipment location. Also t he influence of connected loads is investigated to some extent. Basic relationships for the CSC and the SVC approaches are shown in appendic es.