High-voltage DC voltage unit and method for operating a high-voltage DC voltage unit

1. An aircraft having a high-voltage DC voltage unit, the high-voltage DC voltage unit, comprising:

a first DC voltage apparatus which is configured to provide a first high-voltage DC voltage between a first output connection and a second output connection of the first DC voltage apparatus or is configured to be fed with a first high-voltage DC voltage;

a second DC voltage apparatus which is configured to independently provide a second high-voltage DC voltage between a first output connection and a second output connection of the second DC voltage apparatus or is configured to be fed with an independent second high-voltage DC voltage;

a first DC voltage connection which is coupled with the first output connection of the first DC voltage apparatus;

a second DC voltage connection which is coupled with the second output connection of the second DC voltage apparatus; and

a reference potential connection which is coupled with the second output connection of the first DC voltage apparatus, with the first output connection of the second DC voltage apparatus and with an earth potential, wherein the first and second high-voltage DC voltages realise a bipolar power supply.

2. The high-voltage DC voltage unit according to claim 1 , wherein the DC voltage apparatuses each have uncontrolled rectifiers.

3. The high-voltage DC voltage unit according to claim 1 , wherein the DC voltage apparatuses each have four-quadrant actuators.

4. The high-voltage DC voltage unit according to claim 2 , further comprising:

two alternating voltage generators which are coupled respectively with one of the DC voltage apparatus and are configured to feed the respectively coupled DC voltage apparatus with electric alternating voltage.

5. The high-voltage DC voltage unit according to claim 4 , wherein the two alternating voltage generators are configured within a single electrical machine with two sets of windings.

6. The aircraft according to claim 1 , wherein the DC voltage apparatuses are bridge halves of a multi-level NPC power converter.

7. The aircraft according to claim 6 , further comprising:

an electrical machine which is coupled with the multi-level NPC power converter and is configured to feed both bridge halves of said multi-level NPC power converter with electric alternating voltage.

8. The high-voltage DC voltage unit according to claim 1 , further comprising:

a first DC voltage intermediate circuit which is coupled between the DC voltage output connections.

9. The aircraft according to claim 1 , further comprising:

two second DC voltage intermediate circuits which are respectively coupled between the first and second output connections of the first and second DC voltage apparatuses.

10. A method for operating a high-voltage DC voltage unit of an aircraft according to claim 1 , comprising:

generating a first high-voltage DC voltage by a first DC voltage apparatus between a first output connection and a second output connection of the first DC voltage apparatus;

independently generating a second high-voltage DC voltage by a second DC voltage apparatus between a first output connection and a second output connection of the second DC voltage apparatus;

providing a bipolar power supply by providing the first high-voltage DC voltage between a first DC voltage connection which is coupled with the first output connection of the first DC voltage apparatus, and a reference potential connection which is coupled with the second output connection of the first DC voltage apparatus, with the first output connection of the second DC voltage apparatus and with an earth potential, and by providing the second high-voltage DC voltage between a second DC voltage connection which is coupled with the second output connection of the second DC voltage apparatus, and the reference potential connection.