Abstract:
Embodiments of the present invention are generally based on employing a power transmission line (160) in a HVDC link to provide auxiliary power to one of the ends of the HVDC link for facilitating a black start thereof when the HVDC link is de-energized, i.e. when at least one of the HVDC converter stations (140, 150) is de-energized and there is no transmission of power between inverter and rectifier HVDC converter stations (140, 150) on each side of the HVDC link. A relatively small amount of power can be conveyed towards one of the HVDC converter stations (140, 150) via the power transmission line (160) so as to provide power to any auxiliary system(s) of the converter station (140, 150), for example prior to a black start of the converter station (140, 150) being carried out.
Abstract:
A multilevel converter cell or power electronics building block (4a, 4b, 4c, 4d) for a multilevel converter comprising a half bridge module (6, 6') having a capacitor unit (8, 8') and at least two semiconductor switches (24, 24', 24'', 24'''), a gate unit (12, 12') configured to control the semiconductor switches, an electric conductor (32), at least a first and second terminal portions (33a, 33b) and a sub cell (5, 5a, 5b, 5a', 5b'). The sub cell (5, 5a, 5b, 5a', 5b') may comprise at least two half bridge modules connected in parallel and the electric conductor and the two terminal portions (33a, 33b) are configured to be connected to the sub cell in at least two different ways in order to provide a half bridge configured sub cell (5a, 5a') or a full bridge configured sub cell (5b, 5b') for the multilevel converter cell.
Abstract:
Embodiments are generally based on employing a power transmission line in a HVDC link to provide auxiliary power to one of the ends of the HVDC link for facilitating a black start thereof when the HVDC link is de-energized, i.e. when at least one of the HVDC converter stations is de-energized and there is no transmission of power between inverter and rectifier HVDC converter stations on each side of the HVDC link. A relatively small amount of power can be conveyed towards one of the HVDC converter stations via the power transmission line so as to provide power to any auxiliary system(s) of the converter station, for example prior to a black start of the converter station being carried out.
Abstract:
The present disclosure relates to a capacitor unit (100) comprising a hollow body extending along an axial direction (108). The body includes a plurality of pieces (101-104) and each piece forms a section of the hollow body. At least one of the pieces is a detachable section of the hollow body and a piece includes at least one capacitor element. The present disclosure relates also to a converter cell comprising such a capacitor unit and to a valve unit comprising a plurality of such converter cells. The valve unit may form part of a converter in a high voltage direct current converter station.
Abstract:
A multilevel converter cell or power electronics building block (4a, 4b, 4c, 4d) for a multilevel converter comprising a half bridge module (6, 6') having a capacitor unit (8, 8') and at least two semiconductor switches (24, 24', 24'', 24'''), a gate unit (12, 12') configured to control the semiconductor switches, an electric conductor (32), at least a first and second terminal portions (33a, 33b) and a sub cell (5, 5a, 5b, 5a', 5b'). The sub cell (5, 5a, 5b, 5a', 5b') may comprise at least two half bridge modules connected in parallel and the electric conductor and the two terminal portions (33a, 33b) are configured to be connected to the sub cell in at least two different ways in order to provide a half bridge configured sub cell (5a, 5a') or a full bridge configured sub cell (5b, 5b') for the multilevel converter cell.
Abstract:
Embodiments are generally based on employing a power transmission line in a HVDC link to provide auxiliary power to one of the ends of the HVDC link for facilitating a black start thereof when the HVDC link is de-energized, i.e. when at least one of the HVDC converter stations is de-energized and there is no transmission of power between inverter and rectifier HVDC converter stations on each side of the HVDC link. A relatively small amount of power can be conveyed towards one of the HVDC converter stations via the power transmission line so as to provide power to any auxiliary system(s) of the converter station, for example prior to a black start of the converter station being carried out.
Abstract:
The present disclosure relates to a power converter (200) comprising a first node (210) adapted to receive a direct current power, a second node (220) adapted to output a three-phase alternating current power, and at least three branch units (230). A branch unit is electrically connectable to the first node and the second node and adapted to convert the received DC into a respective phase of the output three-phase AC. Further, the branch unit is arranged in a sealed enclosure (435) which is separately arranged from sealed enclosures of the other branch units, thereby forming separate branch unit modules (430). The separate branch unit modules may facilitate maintenance and transport of the power converter.
Abstract:
It is provided a power converter for transferring power between a high voltage DC connection and a high voltage AC connection. The power converter includes a power converter assembly including: a first converter arm, a first reactor, a second reactor and a second converter arm, connected serially between the positive and negative terminals of the DC connection. The high voltage AC connection is provided between the first reactor and the second reactor. Each one of the converter arms includes a plurality of converter cells and each one of the converter cells includes a switching element and an energy storage element. Both the first reactor and the second reactor are oil filled reactors.