Variable time step application on hybrid eletromechanical–eletromagnetic simulation

This study presents a new hybrid eletromechanical–eletromagnetic simulation implementation in which a variable time step with simultaneous solution of differential and algebraic equations are the methods used for network solution and numerical integration of the electromechanical dynamics. The variable time step imposes changes in the parallel communication protocol between the positive-sequence phasor and three-phase waveform simulation algorithms. Results demonstrate the methodology accuracy applied to a modified version of the IEEE 39-bus test system.