Impact of active current priority IBR controls on grid voltage stability

Some existing grid codes for inverter-based resources (IBR) require active current priority control during grid disturbances with the intention of improving grid frequency stability. This active current priority control deprioritizes reactive current inje ction used to support voltage stability. Analysis presented in this paper shows the impact of active current priority control on vo ltage stability as compared to other types of control. Analysis is carried out using quasi-steady state calculations as well as time-domain simulations to demonstrate the effect of using different type of IBR controls during faults. The results indicate that active current priority control may have a significant adverse impact on voltage stability of IBR plants. Further, system ele ctrical physics may prevent simultaneous compliance of both active current priority requirements and existing low-voltage ride through requirements. This study mainly focuses on the in-fault response of the system to different type of controls.