  This paper addresses the closed-loop ramp comparison current regulation in an
induction machine fed by a pulse width modulated voltage source inverter. The
regulator is implemented in a synchronous frame, serving as a foundation for an
overarching vector control of the induction machine. First, the effect of PI
regulator gains on the controller performance is analyzed both theoretically
and numerically using the developed Simulink model of the system. Next, the
paper deals with high speed and/or low-voltage operating conditions of the
machine, introducing the concept of overmodulation and analyzing its impact on
the regulator performance. Obtained simulation results coincide with
model-based theoretical predictions and literature findings. Finally, the work
proposes an outlook for the high-speed system enhancements in terms of power
electronics topology, control and modulation.
