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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 modular multilevel topologies, such as Modular Multilevel Matrix Converter, Hexverter, and Modular Multilevel Converter in back-to-back configuration can be still operated when one or more modules failed, even if no extra module was added for redundancy. This paper proposes two novel approaches for the operation of these converter topologies with a reduced number of modules in wind energy systems...
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.
Modular Multilevel Converters have a large number of advantages at high voltage and power levels. Due to their modular structure, they offer easy scalability, high quality output waveforms, and superior availability, to name a few. This paper aims at further increasing the availability of the Modular Multilevel Matrix Converter. A new method allows to operate the converter even in the case that a...
Modular multilevel converters offer many advantages for high-voltage and high-power applications. A recently proposed modular multilevel direct AC/AC converter is the so-called Hexverter. This paper presents a method to control the energy stored in the branches of the Hexverter topology. The control concept is described and possible degrees of freedom for the branch energy control are analysed analytically...
The recently proposed modular multilevel converter “Hexverter” offers many advantages in high-voltage and high-power applications. This paper presents an improved Hexverter topology by introducing magnetically coupled branch inductors. These lead to a simplified system behaviour and a reduced amount of material for the branch inductors.
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...
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