A sub-sea power delivery system (10) includes a plurality of modular power converter building blocks (12), (13) on each of the power source (20) side and the sub-sea load side (30) that are stacked and interconnected to meet site expansion requirements and electrical load topologies. The power delivery system comprises (10) a system DC transmission link/bus (14), wherein the system DC link (14) is configured to carry HVDC or MVDC power from an onshore utility or topside power source (20) to multiple sub-sea load modules (18). The stacked modular power converter topology on the sub-sea side of the sub-sea power delivery system (10) is symmetrical with the stacked modular power converter topology on the on-shore/top-side of the sub-sea power delivery system (10).

Modular stacked subsea power system architectures

A collection and transmission system (10) includes: a system direct current (DC) link (12) configured for carrying power from a source (13) to a grid (16); and alternating current (AC) to DC power converter modules (19, 119, 219, 319) coupled in series to the system DC link on a source side of the system DC link, each power converter module configured for being coupled to one or more sources (114, 214, 314, 414) on the source side, wherein each power converter module is configured to short circuit the DC terminals of the power converter module upon receipt of a respective command signal.

Collection and transmission system

A high voltage dc transmission system uses equipment of self-commutated converters each of which comprises switching devices with a self-commutating (gate-turn-off) function A first control equipment associated with the rectifier comprises a constant reactive power (var) control circuit for holding constant the reactive power on the input side of the rectifier, and a constant dc voltage control circuit for holding constant the dc system voltage on the output side thereof A second control equipment associated with the inverter comprises a constant reactive power control circuit for holding constant the reactive power on the output side of the inverter, and a constant active power control circuit for holding constant the active power on the output side thereof The first control equipment and the second control equipment each have a current control circuit for making independent control of each component of a two-phase current resulted from transformation of a three-phase ac current

Control equipment for high voltage direct current transmission system with equipment of self-commutated converter

A system for the transmission of a direct current (DC) at a medium voltage level includes a system DC link configured to carry power from a source to a load module. The load module includes a DC-to-DC voltage step-down converter, a DC-to-AC inverter coupled downstream to the DC-to-DC voltage step-down converter, and a system AC link for carrying power from the load module to a motor system on a load side of the system AC link. The system is effective for delivering power over distances that are greater than 30 kilometers, and for delivery of power from an on-shore to offshore and sub-sea load.

MVDC power transmission system for sub-sea loads

A direct current (DC) transmission and distribution system includes a system DC link configured for carrying power from a source to a plurality of loads {16} and DC to alternating current (AC) power converter modules coupled in series to the system DC link on a load side of the system DC link

Direct current power transmission and distribution system

OF THE DISCLOSURE A state signal is formed to indicate a transition to a bypass mode of operation. In forming the signal of each winding system of a corresponding converter transformer on a side of the converter transformer are determined, weighted with weighting factors and summed up. The summation current formed in this manner does not have any null zones in the normal operation of the converter. All weighting factors are different if the phase currents between the converter and the converter transformer are used to produce the summation current. In the case of a converter transformer which is connected to the converter via a delta-connected winding system and in which the winding currents are used, certain differences formed by the weighting factors are not to be the same. A DC Hall converter with an insertion hole is particularly well suited for weighting and combining the currents of each individual winding system.

State signal formation for indicating the transition into the bypass mode of operation in an apparatus for high-voltage D-C transmission

not available for EP0290914Abstract of corresponding document: US4837671A state signal is formed to indicate a transition to a bypass mode of operation. In forming the signal of each winding system of a corresponding converter transformer on a side of the converter transformer are determined, weighted with weighting factors and summed up. The summation current formed in this manner does not have any null zones in the normal operation of the converter. All weighting factors are different if the phase currents between the converter and the converter transformer are used to produce the summation current. In the case of a converter transformer which is connected to the converter via a delta-connected winding system and in which the winding currents are used, certain differences formed by the weighting factors are not to be the same. A DC Hall converter with an insertion hole is particularly well suited for weighting and combining the currents of each individual winding system.

Rembert Kohler

Papers

State signal formation for indicating the transition into the bypass mode of operation in an apparatus for high-voltage D-C transmission

Status signal generated for indicating the by-pass transition in a device for high voltage direct current power transmission