Improving transient performance of VSG based microgrids by virtual FACTS' functions

Abstract

This report presents a transient proportional controller which is augmented on virtual inertia's topology. The concept of virtual synchronous generator (VSG) is inspired by the behavior of the synchronous generators and researchers map this behavior on microgrids to mimic the power system's dynamics on microgrids. The added characteristic is based on FACTS' functions such as: STATCOM swing damping capability for large-signal disturbance damping at transient times, for VSG based microgrids. This capability is added to the VSG structure by a bang-bang controller. The proposed bang-bang controller is used to improve transient response of VSG based microgrids just in large signal disturbances, including: islanding, three-phase faults, and huge variation of loads. Simplicity and capability to improve the transient response are the main features of the added configuration. Simulation results verify the improvement of the introduced manner by the represented augmented VSG control strategy.