Modular multilevel DC/DC converter for HVDC applications
First Claim
1. A DC-to-DC voltage converter for connecting HVDC grids having different voltages carried on first DC voltage terminals and on second DC voltage terminals, respectively, the DC-to-DC voltage converter comprising:
- 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 the first DC voltage terminals carrying a first DC voltage and said second partial converter extending between the second DC voltage terminals carrying a second DC voltage; 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 and said second partial converter via said power exchange device;
wherein at least one of said first and second partial converters is a self-commutated converter having a power semiconductor switch to be selectively switched on and off;
and wherein at least one of said first partial converter and 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; and
wherein each said sub module is at least one of a full-bridge circuit, a double-module circuit, or a half-bridge circuit.
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Accused Products
Abstract
A DC converter is suitable for continuous operation for connecting high-voltage DC networks having different voltages. The DC converter has a first partial converter and a second partial converter, which are connected in series with each other, forming a converter series circuit. The converter series circuit extends between the DC terminals of a DC connection. The second partial converter extends between the DC terminals of a second DC connection. The first partial converter and the second partial converter are connected to each other via a power exchange device, such that the exchange of electrical power between the first partial converter and the second partial converter is made possible via the power exchange device.
25 Citations
16 Claims
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1. A DC-to-DC voltage converter for connecting HVDC grids having different voltages carried on first DC voltage terminals and on second DC voltage terminals, respectively, the DC-to-DC voltage converter comprising:
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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 the first DC voltage terminals carrying a first DC voltage and said second partial converter extending between the second DC voltage terminals carrying a second DC voltage; 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 and said second partial converter via said power exchange device; wherein at least one of said first and second partial converters is a self-commutated converter having a power semiconductor switch to be selectively switched on and off; and wherein at least one of said first partial converter and 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; and wherein each said sub module is at least one of a full-bridge circuit, a double-module circuit, or a half-bridge circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A DC-to-DC voltage converter for connecting HVDC grids having different voltages, the DC-to-DC voltage converter comprising:
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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 and said second partial converter via said power exchange device; wherein at least one of said first and second partial converters is a self-commutated converter having a power semiconductor switch to be selectively switched on and off; wherein at least one of said first partial converter and 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, and each said sub module is a full-bridge circuit, a double-module circuit, or a half-bridge circuit; and wherein a number (nvB) of bidirectionally blocking sub modules is given by - View Dependent Claims (16)
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Specification