Method for operating parallel auxiliary converters in a rail vehicle

A method of supplying an electrical load in an on-board energy supply network of a rail vehicle With electrical energy, said energy supply network having a grounded N conductor and at least two auxiliary converters that are switched in parallel on an AC voltage side, comprising the steps of:

• switching off the auxiliary converters in the event of a short circuit to ground;
• interrupting a connection between the switched-off auxiliary converters and the energy supply network by opening at least one respective switch;
• switching on one of the switched-off auxiliary converters;
• synchronizing the phase position and frequency of the converter that is switched-on while switching on a further auxiliary converter that was switched off;
• and
• closing the at least one switch that interrupted the connection between the auxiliary converters and the energy supply network, once absence of the short circuit to ground has been established, thereby operating the auxiliary converters with phase position and frequency synchronicity.

An on-board energy supply system of a vehicle, comprising:

• at least two auxiliary converters configured to be switched in parallel on an AC voltage side and to be synchronous in phase position and frequency;
• an energy supply network configured to supply an electrical load with electrical energy and having a grounded N conductor that is connected to the converters;
• and
• a switch configured to interrupt a connection between the grounded N conductor and the auxiliary converters of the energy supply network.