Transient Stability Enhancement Control for VSG Considering Power Angle Stability and Fault Current Limitation

Abstract

Virtual synchronous generators (VSGs) can provide voltage and frequency support to power systems due to their inertial and damping features. Unfortunately, power angle stability and fault current limitations are still challenging aspects of VSGs under large disturbances. Power angle stability and fault current limitations are indispensable for the safe operation of a VSG. However, in existing studies, these aspects are mostly solved as two independent problems. In this paper, the comprehensive transient stability enhancement (CTSE) control strategy for a VSG, considering power angle stability and fault current limitations is proposed. With a CTSE control, VSG’s transient power angle stability is guaranteed. In addition, the steady-state and impulse components of the fault current are fully limited. Furthermore, CTSE control parameters adapted to different fault degrees are presented. Finally, simulation and experimental tests are performed to validate the performance of the proposed method.