Aanalysis of the feasibility of broadband oscillation suppression for PMSG integration into weak grid based on virtual synchronous generator control

Abstract With the significant growth in installed wind power capacity, the penetration of power electronics has increased substantially. A notable effect of this heightened integration of power electronics into the power system is a decrease in the system’s overall inertia, leading to a deterioration in grid stability. Consequently, these alterations pose fresh obstacles to maintaining frequency stability within power systems. However, the ability of wind turbines based on grid-following converters to support weak grids is limited. They fail to meet the operational stability requirements for high shares of renewable energy in the grid. Virtual synchronous generator (VSG)-type converter can enhance system inertia damping while independently regulating AC voltage and frequency, thus providing active support for the system in weak grids with a strong frequency dynamic response capability. In this paper, impedance models of permanent magnet synchronous generators (PMSGs) are developed using an impedance modeling approach. Simulation results validate that the control strategy in this paper offers remarkable stability support for the system.