INDIRECTLY COUPLING TIME-STEPPING TECHNIQUES FOR ELECTROMAGNETIC SYSTEMS USING QUASI NEWTON-RAPHSON SOLVERS AND ONLINE FIELD CALCULATIONS

The paper describes indirectly coupling time-stepping techniques using quasi Newton-Raphson solvers and on-line field calculations. Due to t he quasi Newton-Raphson solvers the electric and magnetic subsystems a re strongly coupled and the number of independent currents exciting th e magnetic field is not limited. Compared to indirectly coupling time- stepping techniques using state-space models and on-line field calcula tions, the number of held calculations can be reduced significantly. A s a first test, these indirectly coupling time-stepping techniques are used to simulate the dynamic response of a ring-core transformer. The simulation results are in good accordance with the measurements.