Converter having a polyphase mains-commutated power converter and a load-side power converter

• US 8,385,086 B2
• Filed: 02/03/2009
• Issued: 02/26/2013
• Est. Priority Date: 02/06/2008
• Status: Active Grant

• Current Assignee: Innomotics GmbH
• Original Assignee: Siemens AG
• Inventors: Hiller, Marc, Sommer, Rainer
• Primary Examiner(s): Vu, Bao Q
• Application Number:
  US12/866,617
• Publication Number:
  US 20110002149A1
• Time in Patent Office: 1,484 Days
• Field of Search: 363/17, 363/98, 363/95, 363/131, 363/132, 363/135, 363/136
• US Class Current: 363/17
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02M 5/4585 having a rectifier with controlled elements
• CPC Class Codes: H02M 7/483 Converters with outputs that each can have more than two voltages levels
• CPC Class Codes: H02M 7/4835 comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

Abstract

A converter has a network-side and a load-side power converter that are connected together on the DC side in an electrically conductive manner. An upper and a lower valve branch of each phase module, respectively, of the load-side power converter has at least one two-poled subsystem. At least one multiphase network-controlled power converter is provided as the network-side power converter. In this way, a converter is obtained, in particular an intermediate voltage circuit converter for intermediate voltages, which combines a simple and cost-effective feed circuit on the network side with a modular multilevel converter on the load side.

Claims

1. A converter, comprising:

a mains-side power converter having a DC voltage side; and

a load-side polyphase power converter having a DC voltage side electrically conductively connected to said DC voltage side of said mains-side power converter;

each phase module of said load-side polyphase power converter having a respective upper and lower valve branch with at least one two-pole subsystem;

said mains-side power converter having at least one polyphase mains-commutated power converter.

2. The converter according to claim 1, wherein said mains-commutated power converter is a diode rectifier.

3. The converter according to claim 1, wherein said mains-commutated power converter is a thyristor rectifier.

4. The converter according to claim 1, wherein said mains-commutated power converter is a half-controlled thyristor bridge.

5. The converter according to claim 1, wherein said mains-commutated power converter is a thyristor reversible power converter.

6. The converter according to claim 4, wherein a diode rectifier and a thyristor rectifier are provided as half-controlled bridges and are connected electrically in series on the DC voltage side.

7. The converter according to claim 1, which comprises a further load-side polyphase power converter connected on a DC voltage side electrically in parallel with said mains-side and a first said load-side polyphase power converter.

8. The converter according to claim 1, wherein said at least one polyphase mains-commutated power converter is one of at least two polyphase mains-commutated power converters electrically connected in series, wherein said at least two polyphase mains-commutated power converters in said mains-side power converter are each linked on an AC voltage side to connections of a low-voltage-side transformer winding of a mains transformer.

9. The converter according to claim 8, wherein said low-voltage-side transformer windings are configured to have a predetermined phase shift angle with respect to one another.

10. The converter according to claim 1, wherein said mains-side power converter is a modular multilevel power converter and said load-side polyphase power converter is a modular multilevel power converter.