A Leakage-Inductance-Tolerant Commutation Strategy for Isolated AC/AC Converters

Nasir, Usman; Costabeber, Alessandro; Rivera, Marco; Wheeler, Pat; Clare, Jon

Abstract

© 2013 IEEE. This paper proposes a generalized commutation strategy suitable for matrix-based isolated ac/ac conversion stages in solid-state transformers for use whenever there is nonnegligible leakage inductance in the isolation transformer. The standard 4-step commutation used in matrix converters can no longer be applied when transformer leakage inductance is present, as overrated switching devices or dissipative snubbers would be necessary, reducing the attractiveness of the topologies that include matrix-based isolated ac/ac stages. A case study of a single-phase ac/ac converter has been investigated in detail to demonstrate the application of the proposed commutation method to a topology that has recently been identified as the potential building block for future multimodular ac/ac converters for grid applications. The proposed leakage-inductance-tolerant commutation strategy is based on the definition of a current decoupling phase in the commutation sequence and only needs suitable timing of the commutation steps, without high bandwidth voltage or current measurements. Matching simulations and experimental results from a 3-kW laboratory scale prototype are presented to support the effectiveness of the proposed strategy.

Citation

Nasir, U., Costabeber, A., Rivera, M., Wheeler, P., & Clare, J. (2019). A Leakage-Inductance-Tolerant Commutation Strategy for Isolated AC/AC Converters. IEEE Journal of Emerging and Selected Topics in Power Electronics, 7(1), 467-479. https://doi.org/10.1109/jestpe.2018.2861326

• Journal Article Type: Article
• Acceptance Date: May 18, 2018
• Online Publication Date: Jul 31, 2018
• Publication Date: 2019-03
• Deposit Date: Aug 3, 2018
• Publicly Available Date: Aug 3, 2018
• Journal: IEEE Journal of Emerging and Selected Topics in Power Electronics
• Electronic ISSN: 2168-6785
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 7
• Issue: 1
• Pages: 467-479
• DOI: https://doi.org/10.1109/jestpe.2018.2861326
• Keywords: 4-Step Commutation, Grid interconnection, Isolated Single-Phase AC-AC converters, Leakage-inductance, Matrix converters, Multi-Modular converters, Solid-State Transformers
• Public URL: https://nottingham-repository.worktribe.com/output/925720
• Publisher URL: https://ieeexplore.ieee.org/document/8423178/
• Additional Information: © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works.