Method for the fault management of a fault in a DC voltage line and converter assembly for carrying out the method

A converter assembly, comprising:

• a modular multi-stage converter including switching modules;
• each of said switching modules having a plurality of semiconductor switches and at least one energy store, some of said switching modules being switching modules of a first type having terminals, and some others of said switching modules being switching modules of a second type having terminals;
• said switching modules of said first type configured to generate a positive switching module voltage, a negative switching module voltage or a zero voltage at said terminals of said switching modules of said first type during operation of the converter assembly;
• said switching modules of said second type configured to generate a positive switching module voltage or a zero voltage at said terminals of said switching modules of said second type during operation of the converter assembly;
• and
• a control device configured for:
• detecting a DC voltage side fault;
• actuating said switching modules of said first type to cause a polarity of energy store voltages thereof to correspond to a polarity of a fault current;
• and
• charging said energy stores of said switching modules of said first type to a voltage in excess of a rated voltage thereof.