Impact of Control Parameters on Angular Stability of Grid-Forming Converters Using Virtual-Admittance Based Control

Paper in proceeding, 2025

This paper investigates the impact of control parameters on the angular stability of grid-forming (GFM) converters using virtual-admittance-based control. The study focuses on a system operating under dynamic grid condition caused by the high penetration of renewable energy sources connected through power electronic converters. By drawing an analogy with a spring-mass-damper system to provide physical insight, it illustrates how the angles of individual masses, representing the converter and the grid, respond to a disturbance. A frequencydomain analysis identifies frequency regions where angle deviations are either amplified or attenuated as parameters are varied. The study examines how control settings, including active-power controller parameters, AC-voltage controller parameters, and virtual impedance, shape this dynamic response. The results highlight trade-offs in control design and offer practical guidance for tuning GFM converters to enhance angular stability under dynamic grid conditions. Finally, time-domain simulations validate the analytical findings.