Dynamics of Inverter-Based Resources in Weak Distribution Grids

This work presents the modelling fundamentals to study dynamics of inverter-based resources (IBRs) in weak distribution grids and derive disturbance performance characteristics describing how they should behave under different conditions. More specifically, with respect small-signal disturbances we possible voltage violations following frequency response from IBRs due low system strength also propose specific design requirements for IBR d–q current control guarantee a stable response. In context large-signal disturbances, highlight active power-voltage may not be effective delay imposed by physical features network. Further, mathematically discuss reactive power could enhance its phase-locked loop stability. The proposed are then integrated into converter via novel voltage-priority reference generation strategy. Simulation results on real Australian network show efficacy operational requirements, unexpected active/reactive interactions grids.