Real-Time Hybrid Transient Stability and Electromagnetic Transient Simulation of Confederated Transmission-Distribution Power Grids

Modern power grids with substantial level of microgrids contributions are large and confederated transmission-distribution (T&D) systems whose real-time transient simulations cannot be handled with conventional tools and methods. This paper reviews the exiting challenges to simulate T&D systems and it reports the implementation of a setup to simulate such systems with different resolutions for transient stability (TS) and electromagnetic transient (EMT) studies in real-time. Two test cases are developed for hybrid TSEMT simulation, one is a transmission grid with 100 nodes and the other one is a synthesized T&D system with over 2700 nodes. To run this system in real-time the time-step for TS zones is 10ms and for EMT domain is 50μus. The accuracy of the results of the first test case are validated by full EMT simulation.