Application US20150256081

MODULAR MULTILEVEL DC/DC CONVERTER FOR HVDC APPLICATIONS
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US20150256081

1-16. (canceled) (0)

17. A DC-to-DC voltage converter for connecting HVDC grids having different voltages, the DC-to-DC voltage converter comprising: (4) (3)

a first partial converter and a second partial converter connected in series with one another to form a converter series circuit;

said converter series circuit extending between DC voltage terminals of a first DC voltage connection and said second partial converter extending between DC voltage terminals of a second DC voltage connection; and

a power exchange device connecting said first partial converter and said second partial converter to one another for enabling an exchange of electric power between said first partial converter (8) and said second partial converter via said power exchange device.

18. The DC-to-DC voltage converter according to claim 17, wherein each of said first and second partial converters forms an AC voltage connection and said power exchange device connects said AC voltage connection of said first partial converter to said AC voltage connection of said second partial converter. (1) (0)

21. The DC-to-DC voltage converter according to claim 17, wherein each one of said first and second partial converters has at least one phase module that forms two series-connected converters, and a potential point between said converter arms of a respective said phase module forms an AC voltage phase of an AC voltage connection. (3) (0)

25. The DC-to-DC voltage converter according to claim 17, wherein at least one of said partial converters is a self-commutated converter having a power semiconductor switch to be selectively switched on and off. (1) (0)

26. The DC-to-DC voltage converter according to claim 25, wherein said first partial converter and/or said second partial converter are in each case modular multi-level converters, which have converter arms having a series circuit composed of two-pole sub modules, wherein each sub module is equipped with at least one energy storage device and power semiconductor switches. (3) (0)

27. The DC-to-DC voltage converter according to claim 26, wherein each said sub module is at least one of a full-bridge circuit, a double-module circuit, and/or a half-bridge circuit. (1) (0)

28. The DC-to-DC voltage converter according to claim 26, wherein each converter arm of said first partial converter includes bidirectionally blocking sub modules and sub modules with half-bridge circuits. (0)

29. The DC-to-DC voltage converter according to claim 26, wherein said second partial converter exclusively has sub modules with half-bridge circuits, wherein a translation ratio between the first DC voltage connection and the second DC voltage connection is greater than or equal to 2. (0)

32. The DC-to-DC voltage converter according to claim 17, wherein said power exchange device has an autotransformer connected to said first and second partial converters via devices for isolating DC voltage potentials. (0)

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Application US20150256081

MODULAR MULTILEVEL DC/DC CONVERTER FOR HVDC APPLICATIONS

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