New approach for static VAr compensator controller design

A systematic approach for static VAr compensator (SVC) design is proposed. The choice of SVC location and damping signal are based on both modal and sensitivity analyses. As the SVC instability is detected in the design process, the design (structure and setting) is achieved through a combined sensitivity coefficient (CSC) which automatically takes into account the damping of both the interarea and SVC modes. The setting is said to be optimal when the CSC with respect to all damping controller parameters approach zero. It is shown that if the SVC mode constraint is ignored, tuning the lead/lag settings for interarea mode damping alone can actually lead to adjustment in the wrong direction.