SPP Grid Strength Study with High Inverter-Based Resource Penetration

As inverter-based resource (IBR) capacity and penetration increase in today's electric power systems, there is increasing concern with respect to system stability and security. Southwest Power Pool (SPP) is aggressively pursuing security certainty as its footprint experiences remarkably high penetration levels of IBR. Recent studies performed by the Electric Power Research Institute (EPRI) and SPP were conducted to determine the stability margin of SPP's system when high levels of renewabies are present. This paper discusses the impact of inverter-based resources with respect to system strength and provides study results showing areas in the SPP footprint that could experience power electronic inverter instability due to large disturbances.