---
_id: '54356'
abstract:
- lang: eng
  text: "Although there are numerous design and control methodologies for the LLC
    resonant converter,\r\nthey often do not consider decentralized control strategies
    to operate them as isolated DC-DC converters within a\r\ncascaded H-bridge. The
    total output power of all LLC converters must be constant to supply a load such
    as a wa-\r\nter electrolyzer. However, each individual LLC converter can vary
    its output power as long as the total output\r\npower remains constant. This opens
    new possibilities in increasing the system efficiency and robustness. Usually,\r\nthe
    DC-link voltage of each module capacitor shows a 2nd harmonic voltage ripple.
    However, the total stored energy\r\nin all DC-link capacitors is constant within
    a grid period for a balanced three-phase system. By controlling each\r\nLLC converter’s
    output power locally to be proportional to the energy stored in its DC-link capacitor,
    modules with\r\na lower instantaneous DC-link voltage transfer less power to the
    load than modules with a higher DC-link voltage.\r\nAs a result, a higher efficiency,
    voltage gain and lower peak resonant capacitor voltage can be achieved with the\r\nsame
    components. The 22.2kW experimental prototype of the LLC converter reaches an
    efficiency of over 97% at\r\nresonance which is similar to the precalculated value."
author:
- first_name: Roland
  full_name: Unruh, Roland
  id: '34289'
  last_name: Unruh
- first_name: Joachim
  full_name: Böcker, Joachim
  id: '66'
  last_name: Böcker
  orcid: 0000-0002-8480-7295
- first_name: Frank
  full_name: Schafmeister, Frank
  id: '71291'
  last_name: Schafmeister
citation:
  ama: 'Unruh R, Böcker J, Schafmeister F. Experimentally Verified 22 kW, 40 kHz LLC
    Resonant Converter Design with new Control for a 1 MW Cascaded H-Bridge Converter.
    In: <i>ECCE Europe 2024; IEEE Energy Conversion Congress &#38; Exposition Europe</i>.
    IEEE. doi:<a href="https://doi.org/10.1109/ECCEEurope62508.2024.10751954">https://doi.org/10.1109/ECCEEurope62508.2024.10751954</a>'
  apa: Unruh, R., Böcker, J., &#38; Schafmeister, F. (n.d.). Experimentally Verified
    22 kW, 40 kHz LLC Resonant Converter Design with new Control for a 1 MW Cascaded
    H-Bridge Converter. <i>ECCE Europe 2024; IEEE Energy Conversion Congress &#38;
    Exposition Europe</i>. ECCE Europe 2024, Darmstadt, Germany. <a href="https://doi.org/10.1109/ECCEEurope62508.2024.10751954">https://doi.org/10.1109/ECCEEurope62508.2024.10751954</a>
  bibtex: '@inproceedings{Unruh_Böcker_Schafmeister, place={Darmstadt}, title={Experimentally
    Verified 22 kW, 40 kHz LLC Resonant Converter Design with new Control for a 1
    MW Cascaded H-Bridge Converter}, DOI={<a href="https://doi.org/10.1109/ECCEEurope62508.2024.10751954">https://doi.org/10.1109/ECCEEurope62508.2024.10751954</a>},
    booktitle={ECCE Europe 2024; IEEE Energy Conversion Congress &#38; Exposition
    Europe}, publisher={IEEE}, author={Unruh, Roland and Böcker, Joachim and Schafmeister,
    Frank} }'
  chicago: 'Unruh, Roland, Joachim Böcker, and Frank Schafmeister. “Experimentally
    Verified 22 KW, 40 KHz LLC Resonant Converter Design with New Control for a 1
    MW Cascaded H-Bridge Converter.” In <i>ECCE Europe 2024; IEEE Energy Conversion
    Congress &#38; Exposition Europe</i>. Darmstadt: IEEE, n.d. <a href="https://doi.org/10.1109/ECCEEurope62508.2024.10751954">https://doi.org/10.1109/ECCEEurope62508.2024.10751954</a>.'
  ieee: 'R. Unruh, J. Böcker, and F. Schafmeister, “Experimentally Verified 22 kW,
    40 kHz LLC Resonant Converter Design with new Control for a 1 MW Cascaded H-Bridge
    Converter,” presented at the ECCE Europe 2024, Darmstadt, Germany, doi: <a href="https://doi.org/10.1109/ECCEEurope62508.2024.10751954">https://doi.org/10.1109/ECCEEurope62508.2024.10751954</a>.'
  mla: Unruh, Roland, et al. “Experimentally Verified 22 KW, 40 KHz LLC Resonant Converter
    Design with New Control for a 1 MW Cascaded H-Bridge Converter.” <i>ECCE Europe
    2024; IEEE Energy Conversion Congress &#38; Exposition Europe</i>, IEEE, doi:<a
    href="https://doi.org/10.1109/ECCEEurope62508.2024.10751954">https://doi.org/10.1109/ECCEEurope62508.2024.10751954</a>.
  short: 'R. Unruh, J. Böcker, F. Schafmeister, in: ECCE Europe 2024; IEEE Energy
    Conversion Congress &#38; Exposition Europe, IEEE, Darmstadt, n.d.'
conference:
  end_date: 2024-09-06
  location: Darmstadt, Germany
  name: ECCE Europe 2024
  start_date: 2024-09-02
date_created: 2024-05-19T14:26:29Z
date_updated: 2024-11-28T14:16:05Z
department:
- _id: '52'
doi: https://doi.org/10.1109/ECCEEurope62508.2024.10751954
keyword:
- Cascaded H-Bridge
- Converter Losses
- Decentralized Control
- Full-Bridge Converter
- LLC Resonant Converter
language:
- iso: eng
main_file_link:
- url: https://ieeexplore.ieee.org/abstract/document/10751954
place: Darmstadt
publication: ECCE Europe 2024; IEEE Energy Conversion Congress & Exposition Europe
publication_identifier:
  isbn:
  - 979-8-3503-6444-6
publication_status: accepted
publisher: IEEE
status: public
title: Experimentally Verified 22 kW, 40 kHz LLC Resonant Converter Design with new
  Control for a 1 MW Cascaded H-Bridge Converter
type: conference
user_id: '34289'
year: '2024'
...