Arrangement for transmitting power between a DC power line and an AC power line
First Claim
1. An arrangement for transmitting power between a direct current power line and an alternating current power line carrying a voltage having a number of phases, said arrangement comprising:
- a number of transformers, one for each phase,a number of power transfer modules, one for each phase, connected in series between the direct current power line and ground or a negative direct current bus, wherein each of the number of power transfer modules comprises;
a first branch including cascaded converter cells, each of the cascaded converter cells comprising an energy storage element connected in parallel with a first group of switching units, wherein all the cascaded converter cells providing a voltage contribution of a corresponding one of the number of power transfer modules is provided in this first branch, anda second branch comprising switching elements that are connected in series,wherein the first branch and the second branch are connected in parallel between a first connection point and a second connection point of the corresponding one of the number of power transfer modules, a primary winding of a corresponding one of the number of transformers is connected to a corresponding alternating current phase conductor of the alternating current power line, and a secondary winding of the corresponding one of the number of transformers is connected between a midpoint of the first branch and a midpoint of the second branch of the corresponding one of the number of power transfer modules.
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Accused Products
Abstract
An arrangement transmits power between a DC power line and an AC power line carrying a voltage having a number of phases. The arrangement includes a number of transformers, one for each phase and a number of power transfer modules, one for each phase, connected in series between the DC power line and ground, where each module includes a first branch including series connected converter cells and a second branch including series connected switching elements. The primary winding of a transformer is connected to a corresponding AC phase conductor of the AC power line and the secondary winding is connected between a midpoint of the first branch and a midpoint of the second branch of a corresponding power transfer module.
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Citations
20 Claims
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1. An arrangement for transmitting power between a direct current power line and an alternating current power line carrying a voltage having a number of phases, said arrangement comprising:
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a number of transformers, one for each phase, a number of power transfer modules, one for each phase, connected in series between the direct current power line and ground or a negative direct current bus, wherein each of the number of power transfer modules comprises; a first branch including cascaded converter cells, each of the cascaded converter cells comprising an energy storage element connected in parallel with a first group of switching units, wherein all the cascaded converter cells providing a voltage contribution of a corresponding one of the number of power transfer modules is provided in this first branch, and a second branch comprising switching elements that are connected in series, wherein the first branch and the second branch are connected in parallel between a first connection point and a second connection point of the corresponding one of the number of power transfer modules, a primary winding of a corresponding one of the number of transformers is connected to a corresponding alternating current phase conductor of the alternating current power line, and a secondary winding of the corresponding one of the number of transformers is connected between a midpoint of the first branch and a midpoint of the second branch of the corresponding one of the number of power transfer modules. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification