An Interface Method for Co-Simulation of EMT Model and Shifted Frequency EMT Model Based on Estimation of Signal Parameters via Rotational Invariance Techniques

The shifted frequency-based electromagnetic transient (SFEMT) simulation is much more efficient than traditional electromagnetic transient (EMT) simulation for AC grids. This letter proposes a novel interface for the co-simulation of the SFEMT model and the conventional EMT model. The fundamentals of SFEMT modeling are first derived. Then, an interface for the co-simulation of EMT and SFEMT models is proposed based on the estimation of signal parameters via rotational invariance techniques. Theoretical analyses and test results demonstrate the effectiveness of the proposed method.