Virtual Synchronous Generator Control With Reliable Fault Ride-Through Ability: A Solution Based on Finite-Set Model Predictive Control

Abstract

Distributed generations are expected to be penetrated widely and largely in the future power grid. Virtual synchronous generator (VSG) control can play a vital role to support the frequency stability of such power grid due to its virtual inertia feature. However, power quality and current control are still challenging aspects of the VSG-based distributed generators (DGs) operation under transient disturbances, such as voltage sag. In this article, a novel finite-set model predictive control (FS-MPC) based method for VSG was studied. The proposed scheme allows a multiple-input-multiple-output (MIMO) system to control voltage and current simultaneously. Under these constantly placed voltage and current constraints, the controller displayed the ability to prevent the system from overcurrent condition and to ride through fault, whereas the injection of nonsinusoidal current under the conditions of unbalanced voltage sag was suppressed. Several simulation and experimental studies were conducted, which validates the superior current-limiting ability and fault ride-through (FRT) capability of the proposed strategy in comparison with the existing methods.