An Improved Predictive Control for T-Type 3L Active-Front-Ends with LCL Filters: A Full State-Variable Feedback Solution

Qianli Xing, Zhenbin Zhang*, Zhen Li, Yu Li, Yuanxiang Sun, Zhe Zhang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

T-type three-level power converters have been widely used in distributed power generation systems (DPGSs), particularly for medium-voltage applications. In order to restrain grid-tied current harmonics, LCL filters are usually installed at the converter output side, due to their effectiveness to eliminate high-frequency harmonic. However, the LCL filter is a typical three-order system that includes a potential resonance frequency and may render the system into an unstable situation. To tackle this problem, we propose an improved Finite-Control-Set Model Predictive Control (FCS-MPC), using a full state-variable feedback mechanism and the exact discretization method. The proposed solution, different from its classical counterparts, takes the full state variables into account that realizes active damping control and harmonic elimination. Finally, simulation verifies that: (i) the exact discretization method improves control accuracy effectively; (ii) the full state-variables feedback FCS-MPC method shows good steady-state and dynamic performance than existed control methods.
Original languageEnglish
Title of host publicationProceedings of 12th IEEE Energy Conversion Congress and Exposition
PublisherIEEE
Publication date2021
Pages1562-1566
ISBN (Print)9781728163444
DOIs
Publication statusPublished - 2021
Event2021 IEEE 12th Energy Conversion Congress and Exposition – Asia - Singapore, Singapore
Duration: 24 May 202127 May 2021

Conference

Conference2021 IEEE 12th Energy Conversion Congress and Exposition – Asia
Country/TerritorySingapore
CitySingapore
Period24/05/202127/05/2021
SeriesProceedings of the Energy Conversion Congress and Exposition - Asia, Ecce Asia 2021
ISSN2150-6078

Keywords

  • Exact discretization method
  • Full state-variable feedback mechanism
  • LCL-filters
  • Predictive control
  • T-type three-level converter

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