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Digital Current Controller with Error-Free Feedback Acquisition and Active Resistance

Levi, E and Peric, LS and Vukosavic, SN Digital Current Controller with Error-Free Feedback Acquisition and Active Resistance. IEEE Transactions on Industrial Electronics. ISSN 0278-0046 (Accepted)

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Abstract

Digital current controllers have the key impact on the performance of grid-side converters and ac drives. The voltage disturbances are commonly suppressed by enhancing the controller with an inner active resistance feedback. In cases where the switching noise and parasitic oscillations introduce sampling errors, conventional sampling is replaced by the oversampling-based error-free feedback acquisition which derives the average of the measured currents over the past switching period. The time delay introduced into the feedback path creates difficulties in designing the current controller with the active resistance. In this paper, we introduce a novel structure of the current controller which includes the error-free sampling and the active resistance feedback. Devised structure improves the disturbance rejection by extending the range of permissible values of the active resistance. Controller structure is based on the internal model principles and it maintains the input step response unaffected. The paper comprises analytical design, the gain setting procedure, computer simulation and experimental results obtained from an experimental setup with a three-phase inverter, digital controller, and a permanent magnet synchronous motor.

Item Type: Article
Additional Information: (c) 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
Uncontrolled Keywords: 08 Information And Computing Sciences, 09 Engineering
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering
Divisions: Electronics and Electrical Engineering
Publisher: Institute of Electrical and Electronics Engineers
Date Deposited: 15 Aug 2017 11:33
Last Modified: 07 Sep 2017 15:31
URI: http://researchonline.ljmu.ac.uk/id/eprint/6939

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