PNNL

Abstract

There is a lot of interest in the policymakers' plans to have grids run entirely on renewable energy in the upcoming years. Future large interconnected grids (LIGs) became more unstable and difficult to comprehend from previous observations as a result of the high renewable penetration. To understand future grids better, the planning studies of future grids must consider a wide range of operating conditions and contingencies. In this paper, we propose a novel future grid planning framework that can simulate a wide range of operating conditions and contingencies while considering future policy and topology changes, production cost models, dynamics, steady state AC power flow, and cascade constraints. This proposed framework is useful for dynamic security assessment of future grids. Voltage stability is one of the constraints for dynamic security assessment. However, voltage stability studies for LIGs make assumptions about switching devices and load change trajectories during system collapse. In this paper, we proposed an approach to identify voltage stability critical locations in the grid without the above assumptions while also considering the cascading/time-series behavior of LIGs. The proposed future grid planning framework is used to generate 1.485 terabytes of dynamic simulation data for 2028 WECC system containing 4455 scenarios. The proposed voltage stability approach is demonstrated on the 2028 representation of the WECC system, and IEEE 30, 300-bus systems.