Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Thiran filter-based fractional delay compensation for grid-tied converters

  • Sunwoo Rhee (Department of Electrical Engineering, Konkuk University) ;
  • Sungmin Lee (Department of Electrical Engineering, Konkuk University) ;
  • Kwonhoon Kim (Department of Electrical Engineering, Konkuk University) ;
  • Younghoon Cho (Department of Electrical Engineering, Konkuk University)
  • Received : 2024.03.25
  • Accepted : 2024.04.24
  • Published : 2024.07.20
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Abstract

This paper proposes fractional delay filter-based repetitive controllers (FDF-RCs) for grid-tied converters. Finite impulse response filters and infinite impulse response filters are used to estimate the fractional-order delay filter in a conventional repetitive controller. To do this, both the Lagrange filter-based repetitive controller (LF-RC) and Thiran filter-based repetitive controller (TF-RC) are utilized as FDF-RCs to compensate a fractional delay. The operating principle, the ladder structure, and the performance analysis of FDF-RCs are addressed. The simulation and the experimental results on a single-phase grid-tied converter verify the harmonic suppression ability and reference-tracking performance of the proposed FDF-RC under the grid frequency variation. Moreover, the advantages of the TF-RC over the LF-RC are discussed by comparing and analyzing the simulation and experimental results.

Keywords

Acknowledgement

This work was partly supported by Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (20212020800020, Development of High Efficiency Power Converter based on Multidisciplinary Design and Optimization Platform) and Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government(MOTIE) (No. 20210501010020, Development on MMC-based ESS and Core Devices of High Voltage Hub-station Grid-Connected with Renewable Energy Source)

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