M.Sc. Stefan Mersche

  • Karlsruher Institut für Technologie (KIT)
    Elektrotechnisches Institut (ETI)

    KIT Campus Süd
    Engelbert-Arnold-Str. 5
    Geb. 11.10, Raum 118
    D-76131 Karlsruhe

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Christina Bischoff

Calvin Laeske

Sarah Okumu

Markus Bayer

Kai Rickert

Haoyang Wu

Robert Schreier

Calvin Laeske

Denis Westernheid

Andreas Heinkele

Fabian Zindorf

Edvardas Bulovas

Xiaotong Li

Joshua Schwarzmüller

Patrick Rimmele



Quasi-Two-Level Flying-Capacitor-Converter for Medium Voltage Grid Applications

  • Autor:

    Mersche, StefanBernet, DanielHiller, Marc        

  • Quelle:

    2019 IEEE Energy Conversion Congress and Exposition (ECCE)

  • Datum: 29 Sept.-3 Oct. 2019
  • Abstract:

    Medium voltage converters are becoming more relevant in future grid applications. Especially more wind and PV generation systems will be have to added and integrated into the grid in order to achieve the required reduction in CO2 emissions. High power generation units will be integrated into the grid at medium voltage level. Furthermore meshed MV grids will require interties based on MV converter technology. Today's standard medium voltage converters are either based on the MMC technology or us 3L/5L approaches operated at low switching frequencies and containing bulky filters. Both concepts still lead to relatively high costs and low efficiencies which are major reasons for the slow spread of power converters in medium voltage grid applications.. Future grid applications demand less distortion, higher reliability and lower costs for converter systems at each voltage level. The Quasi-Two-Level operation of the flying capacitor multilevel converter with silicone-carbide (SiC) based semiconductors is a method for achieving these requirements for medium voltage converters. This paper presents a new concept for minimizing capacitance and balancing the capacitors with fast switching semiconductors. Moreover, a novel approach for limiting the overvoltage stress caused by the Quasi-Two-Level modulation of a flying capacitor converter is presented.

Highly Dynamic AC Current Control for Modular Multilevel Converters

  • Autor:

    Braeckle, D.; Himmelmann, P.; Mersche, S.; Stefanski, L.; Hiller, M.

  • Quelle:

    2021. 23rd European Conference on Power Electronics and Applications (EPE’21 ECCE Europe), 06.09.2021 – 10.09.2021, Seite 1–10, IEEEXplore

  • Datum: 6-10 Sept. 2021
  • Abstract:

    A highly robust and dynamic control of the MMC grid currents is necessary to ensure grid stability. Based on a state space modelling of the MMC, a real time capable indirect modelbased control is presented. Measurements with a laboratory setup show the reliability even under disturbed grid conditions.

Medium Voltage Power Electronic Building Block for Quasi-two-level Operation of a Flying Capacitor Converter

  • Autor:

    Stefan Mersche; Robert Schreier; Patrick Himmelmann; Marc Hiller

  • Quelle:

    2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

  • Datum: 6-10 Sept. 2021
  • Abstract:

    Today’s standard medium voltage converters are operated at low switching frequencies and contain bulky line filters. One concept to change this is the Quasi-Two-Level operation of multilevel converters with fast switching semiconductors to minimize passive components. This paper presents the hardware of a full-scale medium voltage SiC-based flying capacitor converter for quasi-two-level operation with up to 10kV DC voltage and 150A line current. This hardware enables studies on the influence of components, modulation principles and control algorithms on the needed filters and the operation of the converter.

Modular Multilevel Converters as Active Filters to Mitigate Low Frequency Current Harmonics in Converter Fed Grid Applications

  • Autor:

    D. Bräckle, S. Mersche, M. Schnarrenberger, P. Himmelmann, M. Hiller

  • Quelle:

    2018 PCIM Europe, International Exhibition and Conference for Power
    Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg,

  • Datum: 05.07.2018
  • Abstract

    This paper describes a method to improve converter fed grid structures with Modular Multilevel Converters (MMC). In grids with decentralized energy production and bidirectional power flow, an increasing number of power electronic loads and sources make power quality an important issue to ensure grid stability. The MMC topology is highly suitable to meet the requirements of a low Total Harmonic Distortion (THD) and voltage stability due to its high quality output voltages. In combination with power line communication based on harmonic injection, MMCs compensate low frequency grid current harmonics and imbalances to improve the power quality. A standalone laboratoryscale converter-fed microgrid including low voltage MMCs shows the capability of the developed control algorithms.