GriDConv – control, design, and experimental verification of a lab-scale high-voltage DC-DC converter

Benedikt Riegler; Klaus Krischan; Michael Hartmann; Markus Reichhartinger

doi:10.1007/s00502-022-01116-y

GriDConv – control, design, and experimental verification of a lab-scale high-voltage DC-DC converter

Titel in Übersetzung: GriDConv – Regelung, Design und experimentelle Verifikation eines Hochspannungs-DC-DC-Wandlers im Labormaßstab

Benedikt Riegler^*, Klaus Krischan, Michael Hartmann, Markus Reichhartinger

^*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Begutachtung

Abstract

Die Entwicklung der Modular Multilevel Converter-Technologie erlaubt es, Hochspannungs-Gleichstromnetze mit mehreren Zu- und Abgängen zu realisieren. Um DC-Netze mit unterschiedlichen Spannungswerten verbinden zu können, werden hocheffiziente und hochkompakte Hochspannungs-DC-DC-Wandler benötigt. Diese Arbeit behandelt den Entwurf und die Regelung eines Hochspannungs-DC-DC-Wandlers ohne Transformator, welcher im Zuge des interdisziplinären Forschungsprojekts „GriDConv“ institutsübergreifend an der Technischen Universität Graz entwickelt wurde. Der DC-DC-Wandler besteht aus verschachtelten Hochspannungshalbbrücken in Kombination mit in Serie geschalteten Submodulen in Vollbrückenausführung. Eine Regelungsstrategie wird entwickelt, welche vorteilhaftes weiches Schalten der Halbbrücken und somit eine beträchtliche Reduktion deren Schaltverluste erlaubt. Darüber hinaus wird eine Regelungsstrategie zur Symmetrierung der Submodulspannungen sowie die Regelung der Gesamtspannung der in Serie geschalteten Zellen vorgeschlagen. Die vorgeschlagenen Regelungsstrategien werden im Detail untersucht und schlussendlich durch Messungen an einem skalierten 50-kW-Labordemonstrator verifiziert.

Titel in Übersetzung	GriDConv – Regelung, Design und experimentelle Verifikation eines Hochspannungs-DC-DC-Wandlers im Labormaßstab
Originalsprache	englisch
Seiten (von - bis)	45-56
Seitenumfang	12
Fachzeitschrift	Elektrotechnik und Informationstechnik
Jahrgang	140
Ausgabenummer	1
Frühes Online-Datum	23 Jan. 2023
DOIs	https://doi.org/10.1007/s00502-022-01116-y
Publikationsstatus	Veröffentlicht - Feb. 2023

Fields of Expertise

Sustainable Systems

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10.1007/s00502-022-01116-yLizenz: CC BY 4.0

s00502-022-01116-yEndgültige, publizierte Fassung, 1,92 MBLizenz: CC BY 4.0

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title = "GriDConv – control, design, and experimental verification of a lab-scale high-voltage DC-DC converter",

abstract = "The advent of the Modular Multilevel Converter technology allows building multi-terminal high-voltage DC grids. In order to interconnect DC grids with different voltage levels, highly efficient and compact high-voltage DC-DC (HVDC) converters are required. This paper presents the control and design of a transformerless high-voltage DC-DC converter, which has been designed and built within the framework of the research project GriDConv at the Graz University of Technology. The converter basically consists of high-voltage half-bridges in combination with a series of submodules with full-bridge technology. A dedicated control strategy for the converter is developed, which allows advantageous soft switching of the high-voltage half-bridges, which considerably reduces switching losses of the half-bridges. In addition, a balancing strategy for the individual cell voltages as well as a control of total cell voltage are presented. The developed control strategies are discussed in detail and, in the end, verified through experiments on a constructed 50 kW lab-scale hardware demonstrator.",

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N2 - The advent of the Modular Multilevel Converter technology allows building multi-terminal high-voltage DC grids. In order to interconnect DC grids with different voltage levels, highly efficient and compact high-voltage DC-DC (HVDC) converters are required. This paper presents the control and design of a transformerless high-voltage DC-DC converter, which has been designed and built within the framework of the research project GriDConv at the Graz University of Technology. The converter basically consists of high-voltage half-bridges in combination with a series of submodules with full-bridge technology. A dedicated control strategy for the converter is developed, which allows advantageous soft switching of the high-voltage half-bridges, which considerably reduces switching losses of the half-bridges. In addition, a balancing strategy for the individual cell voltages as well as a control of total cell voltage are presented. The developed control strategies are discussed in detail and, in the end, verified through experiments on a constructed 50 kW lab-scale hardware demonstrator.

AB - The advent of the Modular Multilevel Converter technology allows building multi-terminal high-voltage DC grids. In order to interconnect DC grids with different voltage levels, highly efficient and compact high-voltage DC-DC (HVDC) converters are required. This paper presents the control and design of a transformerless high-voltage DC-DC converter, which has been designed and built within the framework of the research project GriDConv at the Graz University of Technology. The converter basically consists of high-voltage half-bridges in combination with a series of submodules with full-bridge technology. A dedicated control strategy for the converter is developed, which allows advantageous soft switching of the high-voltage half-bridges, which considerably reduces switching losses of the half-bridges. In addition, a balancing strategy for the individual cell voltages as well as a control of total cell voltage are presented. The developed control strategies are discussed in detail and, in the end, verified through experiments on a constructed 50 kW lab-scale hardware demonstrator.

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GriDConv – control, design, and experimental verification of a lab-scale high-voltage DC-DC converter

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