Advanced EMT Simulation Techniques for Large Scale Transmission & Distribution Networks

With the deep integration of inverter-based resources (IBR) at both the transmission and distribution levels, large-scale dynamic simulations have increasingly become a requirement to evaluate, validate, and verify new resources and their interaction with existing ones before their field deployment. Transient Stability Analysis (TSA) based modeling has been more favored for larger power system studies due to the computational burden and costs of extensive modeling associated with Electromagnetic Transient (EMT) tools. This research aims to validate advanced EMT methods for modeling large-scale transmission and distribution systems. In addition to the conventional monolithic EMT simulation approach, two alternative setups are investigated: a co-simulation setup utilizing the Real Time Digital Simulator (RTDS) and Transient Stability Analysis Tool (TSAT) software, and a hybrid setup employing an equivalent model inside RTDS with a Dynamic Phasors (DP) interface between EMT and the equivalent model. The validation process involves rigorous assessments of steady-state and dynamic studies against the monolithic models. The findings demonstrate that both the co-simulation and hybrid simulation methods offer economic advantages for specific EMT modeling studies meanwhile dynamic interactions are still be considered for large-scale power systems, eliminating the need to model an entire network in the EMT platform.