Abstract
This paper examines the improvement of power system dynamics by use of thyristor controlled series capacitors (TCSCs) and static VAr systems (SVCs). Models suitable for incorporation in dynamic simulation programs for studying angle stability are analysed. A control strategy for damping of electromechanical power oscillations using an energy function method is derived. Using this control strategy each device (TCSC and SVC) will contribute to the damping of power swings without deteriorating the effect of the other power oscillation damping (POD) devices. The damping effect is robust with respect to loading condition, fault location and network structure. Furthermore, the control inputs are based on local signals. The effectiveness of the controls are demonstrated for a model power system. (3 pages)
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