Short-term voltage instability: Effects on synchronous and induction machines

This paper discusses a few aspects of short-term voltage instability: modeling of transient overexcitation limiters of synchronous generators; possible outcomes of instability, such as induction motor stalling, or generator loss of synchronism leading to a local blackout; eigenvalue tracking and use of eigenvector to identify and characterize the instability mode; and finally, induction motor disconnection to counteract short-term voltage instability. Results on a system with large penetration of induction wind generators, as well as on a small test system, commonly used in voltage stability studies, are included.