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Optimal Design of a High-Voltage DC/DC Converter for the 11.5-MW/115-kV ESS Long-Pulse Modulator

Collins, Max LU and Martins, Carlos A. LU (2020) In IEEE Transactions on Plasma Science 48(10). p.3332-3341
Abstract

The stacked multilevel (SML) klystron modulator topology has been suggested as an alternative to conventional pulse transformer-based topologies in an attempt to improve output pulse performance and reduce system size for long-pulse applications. In this topology, a power converter chain including a high-frequency transformer generates the output pulse in a pulse modulation/demodulation scheme, eliminating the direct size-pulse length dependency inherently associated with pulse transformers while allowing a higher degree of freedom in design. This article details the design of the SML pulse generation stage with particular focus on the aspects of system extents volume, system efficiency, converter lifetime, and complexity. Key component... (More)

The stacked multilevel (SML) klystron modulator topology has been suggested as an alternative to conventional pulse transformer-based topologies in an attempt to improve output pulse performance and reduce system size for long-pulse applications. In this topology, a power converter chain including a high-frequency transformer generates the output pulse in a pulse modulation/demodulation scheme, eliminating the direct size-pulse length dependency inherently associated with pulse transformers while allowing a higher degree of freedom in design. This article details the design of the SML pulse generation stage with particular focus on the aspects of system extents volume, system efficiency, converter lifetime, and complexity. Key component design equations are derived and integrated into an optimal design routine used to primarily study trade-offs between volume and efficiency, as well as in selecting a design for ESS klystron modulator requirements - pulse amplitude 115 kV/100 A, pulse length 3.5 ms, pulse repetition rate 14 Hz, efficiency > 90%, and lifetime > 25 years. The chosen design is characterized through circuit simulation and 3-D finite element analysis, and is validated in power testing.

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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Accelerator power supplies, dc-dc power conversion, high-voltage techniques, pulse power systems, pulse shaping methods
in
IEEE Transactions on Plasma Science
volume
48
issue
10
article number
9096526
pages
10 pages
publisher
IEEE - Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85092705860
ISSN
0093-3813
DOI
10.1109/TPS.2020.2991451
language
English
LU publication?
yes
id
d6e4ccaa-1e7a-42fb-b5b5-16766e3a080b
date added to LUP
2020-11-09 09:52:38
date last changed
2025-04-04 14:02:27
@article{d6e4ccaa-1e7a-42fb-b5b5-16766e3a080b,
  abstract     = {{<p>The stacked multilevel (SML) klystron modulator topology has been suggested as an alternative to conventional pulse transformer-based topologies in an attempt to improve output pulse performance and reduce system size for long-pulse applications. In this topology, a power converter chain including a high-frequency transformer generates the output pulse in a pulse modulation/demodulation scheme, eliminating the direct size-pulse length dependency inherently associated with pulse transformers while allowing a higher degree of freedom in design. This article details the design of the SML pulse generation stage with particular focus on the aspects of system extents volume, system efficiency, converter lifetime, and complexity. Key component design equations are derived and integrated into an optimal design routine used to primarily study trade-offs between volume and efficiency, as well as in selecting a design for ESS klystron modulator requirements - pulse amplitude 115 kV/100 A, pulse length 3.5 ms, pulse repetition rate 14 Hz, efficiency &gt; 90%, and lifetime &gt; 25 years. The chosen design is characterized through circuit simulation and 3-D finite element analysis, and is validated in power testing. </p>}},
  author       = {{Collins, Max and Martins, Carlos A.}},
  issn         = {{0093-3813}},
  keywords     = {{Accelerator power supplies; dc-dc power conversion; high-voltage techniques; pulse power systems; pulse shaping methods}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{3332--3341}},
  publisher    = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
  series       = {{IEEE Transactions on Plasma Science}},
  title        = {{Optimal Design of a High-Voltage DC/DC Converter for the 11.5-MW/115-kV ESS Long-Pulse Modulator}},
  url          = {{http://dx.doi.org/10.1109/TPS.2020.2991451}},
  doi          = {{10.1109/TPS.2020.2991451}},
  volume       = {{48}},
  year         = {{2020}},
}