Load-adaptive zero-phase-shift direct repetitive control for stand-alone four-leg VSI

Lidozzi, Alessandro and Solero, Luca and Crescimbini, Fabio and Ji, Chao and Zanchetta, Pericle (2016) Load-adaptive zero-phase-shift direct repetitive control for stand-alone four-leg VSI. IEEE Transactions on Industry Applications, 52 (6). pp. 4899-4908. ISSN 1939-9367

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Abstract

This paper deals with a dedicated load adaptive phase compensation algorithm to be used in Repetitive Control based stand-alone 4-leg VSI. The plant model is achieved, its inherent modifications according to the operating point are highlighted and used to properly adapt the Repetitive Control structure. Modification of the repetitive control parameters is described to obtain the desired phase compensation capabilities achieving a Zero-Phase-Shift condition at each harmonic. This allows to increase the gain of the Repetitive Controller at high order harmonics thus yielding a better VSI output voltages with strongly reduced THD and faster dynamic response. As a consequence, the VSI output voltages are almost independent from the loads to be fed and the 4-leg VSI with the proposed Zero-Phase-Shift Direct Repetitive Control is an ideal candidate to supply sensitive loads in microgrid, in particular for stand-alone applications.

Item Type: Article
Additional Information: (c) 2016 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.
Keywords: Unbalanced loads, DC-AC power converters, Distributed power generation, Harmonic distortion, Repetitive control stability
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Electrical and Electronic Engineering
Identification Number: 10.1109/TIA.2016.2595493
Depositing User: Burns, Rebecca
Date Deposited: 23 Jan 2017 15:37
Last Modified: 14 Oct 2017 12:36
URI: http://eprints.nottingham.ac.uk/id/eprint/40002

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