@PhdThesis{dbt_mods_00026846,
  author = 	{Dang Dr.-Ing., Pengpai},
  title = 	{Systementwurf von Spannungszwischenkreisumrichtern in einem schwachen Netz},
  year = 	{2015},
  month = 	{Nov},
  day = 	{19},
  keywords = 	{ein schwaches Netz; unsymmetrische Betriebsbedingungen; Harmonische; Dimensionierung der Leistungshalbleiter und des Zwischenkreiskondensators; mehrere parallele Stromrichter; dynamischen Wechselwirkungen; Robustheit},
  abstract = 	{In many power systems a three-phase PWM converter is a major topology and
interfaces renewable energy source with a power grid.For some converter
systems power grid is weak, which is typically characterized by the high
grid impedance. A weak grid can lead to new problems for design of this
power converter system.The unbalanced operating conditions occur in the
converter system. They can cause harmonics both on the AC side and the DC
side of the converter system. Such harmonics not only deteriorate the
performance of the system but also increase the stress on the DC link
capacitor.A weak power grid can intensify the influences of the unbalanced
operating condition in the converter system. Therefore, in this
dissertation a new control for the converter system is proposed under
unbalanced operating condition, in order to eliminate these harmonics, thus
decrease the size of DC link capacitor.Furthermore, the influences of the
unbalanced condition should be considered to dimension the semiconductor
and the DC link capacitor in the converter system. The analysis results are
compared with that under balanced condition.In practical applications
several converters are connected in parallel to a weak grid. Here the
converters could influence mutually. In this work the dynamic interaction
of the converters is in detail analyzed. Based on the analysis, the methods
are given, in order to improve the robustness of the converter.Finally the
simulations and experiments are carried out to verify the validity of the
theoretical analyses.},
  url = 	{https://www.db-thueringen.de/receive/dbt_mods_00026846},
  url = 	{http://uri.gbv.de/document/gvk:ppn:84009096X},
  file = 	{:https://www.db-thueringen.de/servlets/MCRZipServlet/dbt_derivate_00032637:TYPE},
  language = 	{de}
}