Modified GFM Controller Capable of Suppressing Transient Current Even in Grid Incidents

Recently, the penetration of inverter-based renewable energy in the power grid is increasing rapidly. The proportion of large synchronous generators in the power grid is decreasing due to the increasing penetration of inverter-based renewable energy. As the number of large synchronous generators decreases, inverter-based renewable energy is increasing the need to supply transient current supplied by synchronous generators in the event of an accident in the power system, and to control the output reliably in weak power systems, GFM is emerging instead of GFL. In this paper, the inverter design elements are reviewed to supply the transient current required by the power grid and an improved GFM controller is proposed to limit the transient current.