Closed-Loop Ramp-Comparison Current Regulator for an Induction Machine with a PWM Voltage-Source Inverter
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.
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