ARRANGEMENT FOR VOLTAGE CONVERSION
6 Assignments
0 Petitions
Accused Products
Abstract
An arrangement for converting direct voltage into alternating voltage and conversely has a Voltage Source Converter with at least one phase leg connected to opposite poles (5, 6) of a direct voltage side of the converter and a series connection of switching cells arranged between said poles. Each half (8, 9) of this series connection is connected to a mid point forming a phase output by a phase reactor. The phase reactors of a said phase leg are built in a transformer (30) configured to connect said phase output to an alternating voltage phase line (28) by forming a primary winding each of the transformer arranged to interact with a secondary winding thereof connected to the alternating voltage phase line.
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Citations
30 Claims
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1-10. -10. (canceled)
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11. An arrangement connected to a direct voltage network for transmitting high voltage direct current, said arrangement being provided for converting direct voltage into alternating voltage and conversely, said arrangement comprising on one hand
a multi-cell Voltage Source Converter having at least one phase leg connecting to opposite poles of a direct voltage side of the converter and comprising a series connection of switching cells, each having at least one energy storing capacitor as well as two terminals connecting the cell to adjacent cells in said series connection of switching cells, a mid point of said series connection of switching cells forming a phase output being configured to be connected to an alternating voltage side of the converter, in which for each half of said series connection of switching cells an inductance means in the form of a phase reactor is arranged to connect said half to said mid point, and on the other for each said phase leg a transformer configured to connect said phase output to an alternating voltage phase line associated with said phase leg, wherein said phase reactors of a said phase leg are built in said transformer by forming a primary winding'"'"' each of the transformer arranged to interact with a secondary winding thereof connected to said alternating voltage phase line, and said two primary windings are so located with respect to each other that a dc component of a current flowing from one of said poles to the other of said poles through said mid point runs in substantially opposite directions through these two primary windings.
Specification