Electromagnetic Transient Modeling and Simulation of Large Power Systems: EMT Simulators for the Future Grid [Feature]

This paper describes modern methods that are pursued in order to enable EMT simulation of large power systems approaching sizes of thousands of nodes. The paper describes solutions such as (i) co-simulation, where multiple solvers are assigned to solve specific areas of a large network in different detail, (ii) multi-solver simulation (e.g., dynamic phasors and EMT), and (iii) network equivalents, wherein portions of a large network are replaced with a computationally efficient equivalent. The paper explains the merits as well as limitations of these methods and points out contemporary directions for further research and development. Large-scale EMT-type simulation using real-time platforms is also addressed.