Synchronous frame PI current regulators in a virtually translated system

This paper presents a virtual translation technique for current regulation for AC machines. A virtual physical parameter is employed to effectively translate the system pole to achieve fast and robust dynamics. Applying this technique to conventional synchronous frame current regulators reduces parameter sensitivity and improves robustness. The current controllers are redesigned in the virtually translated system. Current regulators adopting the technique have been analyzed in complex vector form for symmetric AC machines and in scalar form for salient-pole AC machines. Several current regulators using this technique have been experimentally evaluated for different operating conditions in an IPMSM drive.