A leakage-inductance-tolerant commutation strategy for isolated AC/AC converters

Nasir, Usman and Costabeber, Alessandro and Rivera, Marco and Wheeler, Pat and Clare, Jon (2018) A leakage-inductance-tolerant commutation strategy for isolated AC/AC converters. IEEE Journal of Emerging and Selected Topics in Power Electronics . ISSN 2168-6785

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Abstract

This paper proposes a generalised 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 multi-modular 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 3kW laboratory scale prototype are presented to support the effectiveness of the proposed strategy.

Item Type: Article
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.
Keywords: 4-Step Commutation, Grid interconnection, Isolated Single-Phase AC-AC converters, Leakage-inductance, Matrix converters, Multi-Modular converters, Solid-State Transformers
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number: https://doi.org/10.1109/JESTPE.2018.2861326
Depositing User: Lashkova, Mrs Olga
Date Deposited: 28 Aug 2018 11:00
Last Modified: 28 Aug 2018 11:05
URI: http://eprints.nottingham.ac.uk/id/eprint/53510

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