Journal
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
Volume 9, Issue 2, Pages 2048-2058Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTE.2022.3210909
Keywords
Index Terms-Decoupled current control; discrete-time system modeling; high-speed ac drive; low sampling-to-fundamental (S2F) ratio; two-degree-of-freedom (2-DOF) decoupled discrete proportional-integral (PI) (DDPI) design
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In this article, a new control structure of discrete PI controller with a deadbeat response is proposed, which combines the advantage of conventional PI controller with deadbeat characteristics. The proposed controller improves system stability and tracking performance.
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 article, a new control structure of discrete PI controller with a deadbeat response is proposed, which combines the advantage of conventional PI controller with deadbeat characteristics. The proposed controller shows a decoupled tracking performance of up to 15% of the switching frequency while also providing 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 (S2F) frequency ratios.
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