Advanced methods, models, and algorithms for multi-rate co-simulation of power system transients

Abstract

This thesis develops advanced methods, models, and algorithms for next generation co-simulation engines for electromagnetic transient (EMT) type simulations by combining the benefits of dynamic phasors (DPs), frequency adaptive simulation of transients, parallel processing, multi-rate simulation, and accuracy of EMT simulators. The thesis addresses a number of important aspects of power system co-simulation including (i) conditions for numerical stability and their reliance on the interface topology, (ii) dynamic phasor extraction methods and their capabilities to represent typical power system phenomena, (iii) adaptive time-step adjustments when the simulated time-horizon includes varying harmonic contents, and (iv) layered electromagnetic transient, dynamic phasor, and transient stability (TS) simulations. The research develops industrial-grade prototypes for co-simulation with EMT and DP-based solvers, and multi-layered co-simulation of EMT, TS, and DP-based solvers based upon novel algorithms. It also implements a large number of component models and interfacing mechanisms for such systems as electric machines, transformers, and advanced converter systems. Illustrative examples are included to demonstrate the thesis' findings, and validate the accuracy and computational benefits of the developed methods, models, and algorithms.