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Karwatzki D.,Leibniz University of Hanover | Baruschka L.,Leibniz University of Hanover | Baruschka L.,Protolar GmbH | Mertens A.,Leibniz University of Hanover
9th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2015-ECCE Asia | Year: 2015

The Hexverter modular multilevel converter topology has been recently proposed for three-phase to three-phase AC/AC conversion. This paper outlines the current state of the art of the Hexverter. The basic working principle is explained and the control concept is introduced. The differences to alternative topologies are discussed and possible applications are pointed out. © 2015 Korean Institute of Power Electronics.


Kucka J.,Leibniz University of Hanover | Karwatzki D.,Leibniz University of Hanover | Baruschka L.,Leibniz University of Hanover | Baruschka L.,Protolar GmbH | Mertens A.,Leibniz University of Hanover
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

The Modular Multilevel Converter (M2LC) is a well-known modular multilevel topology. This paper proposes a novel branch inductor coupling and compares it to the center-tapped inductor and the standard non-coupled inductor topology. The proposed coupling has a significant influence on the inductor and converter dimensioning. Its properties make it especially well-suited for use in M2LC single-to-three-phase AC/AC converter applications. © 2015 IEEE.


Karwatzki D.,Leibniz University of Hanover | Baruschka L.,Leibniz University of Hanover | Baruschka L.,Protolar GmbH | Kucka J.,Leibniz University of Hanover | Mertens A.,Leibniz University of Hanover
2015 IEEE Energy Conversion Congress and Exposition, ECCE 2015 | Year: 2015

This paper presents an alternative approach for analysing and controlling the Modular Multilevel Matrix Converter. After a system description, the proposed current control and branch energy balancing methods are introduced. As distinguished from previous approaches, the presented method is more general and easier applicable to other modular topologies. Its functionality is verified by simulation and an experimental test setup. © 2015 IEEE.


Baruschka L.,Leibniz University of Hanover | Baruschka L.,Protolar GmbH | Mertens A.,Leibniz University of Hanover
IEEE Transactions on Industry Applications | Year: 2013

A new ac/ac modular multilevel topology for connecting two three-phase systems is introduced. The operating principle is explained, and characteristic waveforms are given. It is shown that the converter system offers superior performance for applications like low-frequency wind turbines. The analytic results are verified by a laboratory setup. © 1972-2012 IEEE.


Baruschka L.,Leibniz University of Hanover | Baruschka L.,Protolar GmbH | Karwatzki D.,Leibniz University of Hanover | Von Hofen M.,Leibniz University of Hanover | Mertens A.,Leibniz University of Hanover
2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014 | Year: 2014

With the rising demand for energy harvesting from regenerative power sources, increasing power and voltage ratings are required of power electronic converter systems. For high-power conversion systems, modular multilevel converters proved to be superior to conventional topologies. This paper introduces a reduced variant of the well-known modular multilevel converter (M2LC) topology suitable for AC/DC conversion. It is compared to the original M2LC topology and examined for its usability in a DC/DC converter application. Results from a detailed simulation model prove the topology's expected functionality. © 2014 IEEE.

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