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@PHDTHESIS{Soltau:688889,
      author       = {Soltau, Nils},
      othercontributors = {de Doncker, Rik W. and Monti, Antonello},
      title        = {{H}igh-power medium-voltage {DC}-{DC} converters : design,
                      control and demonstration; 1. {A}uflage},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2017-04084},
      isbn         = {978-3-942789-42-4},
      pages        = {viii, 176 Seiten : Illustrationen, Diagramme},
      year         = {2017},
      note         = {Auch veröffentlicht auf dem Publikationsserver der RWTH
                      Aachen University; Dissertation, RWTH Aachen University,
                      2017},
      abstract     = {In direct-current (dc) networks, dc-dc converters are used
                      to step up or step down dc voltages and are therefore
                      considered as the equivalent of the transformer in the
                      classical alternating-current (ac) system. This dissertation
                      is dedicated to the implementation of a medium-voltage
                      high-power dc-dc converter. After modeling the converter, a
                      fast current controller is demonstrated that sets a
                      reference current within one third of a switching period.
                      Moreover, a balancing control scheme is developed which
                      increases the utilization of the converter. To increase the
                      converter efficiency, an auxiliary circuit is designed for a
                      medium-voltage high-power application. The prototype
                      demonstrates a compact design and an amortization in less
                      than one year for a wind application. The medium-frequency
                      transformer is a key component in the dc-dc converter. The
                      high power density and the requirements on the stray
                      inductance make its design challenging. Therefore,
                      especially the core losses under the influence of power
                      electronics and the design of the stray inductance are
                      analyzed. Moreover, a 2.2 MVA transformer operated at 1 kHz
                      is constructed. It demonstrates a ten-fold power density
                      compared to a 50 Hz transformer. Finally, the dissertation
                      presents the construction and the setup of a high-power
                      medium-voltage demonstrator of the converter. The
                      demonstrator is rated for 5 kV dc-link voltage and a power
                      of 5 MW. From the commissioning, valuable experience on an
                      industrial construction of the converter are concluded, as
                      well as future research topics.},
      cin          = {614510 / 614500},
      ddc          = {621.3},
      cid          = {$I:(DE-82)614510_20140620$ / $I:(DE-82)614500_20201203$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2017-04084},
      url          = {https://publications.rwth-aachen.de/record/688889},
}