Assembly having a multilevel power converter

A method for polarity-dependent limiting of a voltage in a multilevel power converter with at least one phase module, the method comprising:

• providing the phase module with a plurality of modules each including a first electrical module terminal and a second electrical module terminal;
• wherein the plurality of modules include:
• modules of a first type, which are capable of outputting a voltage of exclusively one polarity or zero voltage at their first electrical module terminal and their second electrical module terminal;
• and
• modules of a second type, which are capable of outputting a voltage of one polarity, a voltage of opposite polarity, or zero voltage at their first electrical module terminal and their second electrical module terminal;
• and
• wherein the at least one phase module includes:
• an AC voltage terminal, a first DC voltage terminal, and a second DC voltage terminal;
• the first DC voltage terminal and the second DC voltage terminal are connected to a direct-current transmission link;
• and
• the direct-current transmission link includes two different conductor types that differ from each other with regard to a capacitance per unit length thereof;
• and
• limiting, by a voltage limiting device, only a voltage of one polarity that occurs across the modules of the second type leaving substantially unchanged a voltage of the opposite polarity that occurs across the modules of the second type.