Vsc-converter
First Claim
1. A VSC-converter for converting high-voltage direct voltage into alternating voltage and vice versa, which comprises a series connection of at least two current valves (2, 3) arranged between two poles (4, 5), a positive and a negative, of a direct voltage side of the converter, each of which current valves comprising a semiconductor element (9) of turn-off type and a rectifying member (10) connected in anti-parallel therewith, an alternating voltage phase link;
- (12) being connected to a midpoint (11), denominated phase output, of the series connection between two current valves while dividing the series connection into two equal parts, characterized in that the converter is provided with means for limitation of the voltage derivatives in relation to ground in the phase output (11), said means comprising one or several capacitive members (20, 22, 23, 24, 36, 37, 38), through which the phase output (11) is connected to ground, said capacitive member/members (20, 22, 23, 24, 36, 37, 38) being designed with a capacitance that is adapted for preventing undesiredly large voltage derivatives in relation to ground in the phase output (11).
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Accused Products
Abstract
The invention relates to a VSC-converter for converting high-voltage direct voltage into alternating voltage and vice versa, which comprises a series connection of at least two current valves (2, 3) arranged between two poles (4, 5), a positive and a negative, of a direct voltage side of the converter, each of which current valves comprising a semiconductor element (9) of turn-off type and a rectifying member (10) connected in anti-parallel therewith, an alternating voltage phase line (12) being connected to a midpoint (11), denominated phase output, of the series connection between two current valves while dividing the series connection into two equal parts. According to the invention, the converter is provided with means for limitation of the voltage derivatives in relation to ground in the phase output (11), said means comprising one or several capacitive members (20, 22, 23, 24, 36, 37, 38), through which the phase output (11) is connected to ground, said capacitive member/members (20, 22, 23, 24, 36, 37, 38) being designed with a capacitance that is adapted for preventing undesiredly large voltage derivatives in relation to ground in the phase output (11). The invention also relates to a plant for transmitting electric power through a direct voltage network for high-voltage direct current (HVDC) comprising such a VSC-converter.
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Citations
14 Claims
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1. A VSC-converter for converting high-voltage direct voltage into alternating voltage and vice versa, which comprises a series connection of at least two current valves (2, 3) arranged between two poles (4, 5), a positive and a negative, of a direct voltage side of the converter, each of which current valves comprising a semiconductor element (9) of turn-off type and a rectifying member (10) connected in anti-parallel therewith, an alternating voltage phase link;
- (12) being connected to a midpoint (11), denominated phase output, of the series connection between two current valves while dividing the series connection into two equal parts, characterized in that the converter is provided with means for limitation of the voltage derivatives in relation to ground in the phase output (11), said means comprising one or several capacitive members (20, 22, 23, 24, 36, 37, 38), through which the phase output (11) is connected to ground, said capacitive member/members (20, 22, 23, 24, 36, 37, 38) being designed with a capacitance that is adapted for preventing undesiredly large voltage derivatives in relation to ground in the phase output (11).
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
Specification