Co-Simulation studies aim at providing a platform to perform synchronized and real-time simulations using Electro-Magnetic Transient (EMT) simulation package and Transient Stability Assessment (TSA) tools. In this application, system is separated into an internal system (modeled in EMT) and external system (simulated in Phasor-Domain) to take advantage of the modeling capability of the EMT and TSA packages. The Co-Simulation studies offer several advantages that include performing hardware-in-loop testing with a much larger portion of the system, using detailed EMT models in a positive sequence TSA study, and capturing low-frequency oscillations in the EMT study. As a Co-Simulation platform, TSAT-RTDS Interface (TRI) has been used in several projects and applied to practical power systems and the presenter will share Powertech’s experience in using TRI and provides details about the process of creation of the Co-Simulation studies. If the base power system is too large, such process typically starts with a dynamic system reduction to reduce number of buses to less than 10,000, which is a practical size for running the system in real-time in TSAT. Based on the purpose of the Co-Simulation study, the boundary between internal and external systems are determined next, which are used to develop the proper model in RTDS and determine injection points in TSAT-side of the simulation. In this process, adjustments may be made to the RTDS model to include additional dynamic details that are not available in the Phasor-Domain model. The presentation will also demonstrate a case study and discuss how the results may be analyzed.
Xi Lin, Powertech