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2-DOF Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios

Wang, Meiqi; Buticchi, Giampaolo; Li, Jing; Gu, Chunyang; Gerada, David; Degano, Michele; Xu, Lie; Li, Yongdong; Zhang, He; Gerada, Chris


Meiqi Wang

Giampaolo Buticchi

Jing Li

Chunyang Gu

Principal Research Fellow in Electrical Machines

Professor of Advanced Electrical Machines

Lie Xu

Yongdong Li

He Zhang


In high performance drive systems, wide bandwidth and reference tracking accuracy of current control loop are fundamental requirements. The conventional PI controller provides robustness against the machine parameter mismatching and zero steady-state error, but its dynamic performance degrades at high-speed due to the bandwidth limitation. In this paper, a new control structure of discrete PI controller with a deadbeat response is proposed, which combines the advantage of conventional PI controller with deadbeat characteristic. The proposed controller shows a decoupled tracking performance of up to 15% of the switching frequency, while also providing an extra control freedom of the disturbance rejection, which effectively improves the system stability. Experiments show a reduction of oscillation by 30% compared to the conventional PI and the validity and applicability of the proposed control method for high-speed applications with low sampling to fundamental frequency ratios.


Wang, M., Buticchi, G., Li, J., Gu, C., Gerada, D., Degano, M., …Gerada, C. (2022). 2-DOF Decoupled Discrete Current Control for AC Drives at Low Sampling-to-Fundamental Frequency Ratios. IEEE Transactions on Transportation Electrification,

Journal Article Type Article
Acceptance Date Sep 16, 2022
Online Publication Date Sep 30, 2022
Publication Date Sep 30, 2022
Deposit Date Dec 6, 2022
Publicly Available Date Dec 6, 2022
Journal IEEE Transactions on Transportation Electrification
Print ISSN 2332-7782
Electronic ISSN 2372-2088
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Keywords Electrical and Electronic Engineering; Energy Engineering and Power Technology; Transportation; Automotive Engineering
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