ASVG model for transient stability studies in unbalanced systems

Abstract

An advanced static VAr generator (ASVG) can be beneficial to power systems in many ways. In order to evaluate its dynamic performance, the device should be modeled appropriately in transient studies. This paper describes the dynamic behavior of ASVG in balanced systems and unbalanced systems. When bus voltage becomes unbalanced due to asymmetrical power systems failure or symmetrical operation, the negative sequence voltage component will cause negative sequence and 3-order harmonic voltage on the AC side of the ASVG. A model is presented for the transient stability studies in unbalanced systems.