Long-distance seabed high-voltage DC power supply system

A high-voltage DC, power supply system technology, applied in AC network circuits, high-efficiency power electronic conversion, irreversible AC power input conversion to DC power output, etc. It can solve the problems of voltage and constant current fault mode operation, large size of power frequency transformer, etc., to achieve the effect of intelligent adaptation to parasitic parameter changes, high reliability, and output maintenance.

CN107645160APending Publication Date: 2018-01-30O&C ELECTRIC TECHN CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-01-30

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Abstract

A long-distance seabed high-voltage DC power supply system includes shore-based power supply transformation equipment and underwater power supply transformation equipment; the shore-based power supplytransformation equipment includes a multi-winding transformer and rectification and voltage reduction modules, the input end of the multi-winding transformer is connected with AC, each secondary winding of the multi-winding transformer are connected with AC input ends of the plurality of rectification and voltage reduction modules respectively, the DC output ends of the rectification and voltagereduction modules are connected in series, form DC outputs after series connection, and are connected with the underwater power supply transformation equipment; the underwater power supply transformation equipment consists of a plurality of voltage reduction and isolation modules whose inputs are connected in series and whose outputs are connected in parallel; and the output ends of the voltage reduction and isolation modules are connected with an electricity load. The long-distance seabed high-voltage DC power supply system provided by the invention has the advantages of high switching frequency, soft-switching technology, small size, high efficiency, fast dynamic response, constant-voltage constant-current adjustment, capability of intelligently adapting to long-distance transmission cable parasitic parameter variation, intelligent fault automatic exiting, automatic voltage sharing and current sharing and the like, and is particularly suitable for long-distance DC power transmission.
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Description

technical field

[0001] The invention relates to a power supply system, in particular to a long-distance submarine high-voltage direct current power supply system. Background technique

[0002] Traditional HVDC power transmission usually uses a converter transformer to boost the voltage, and then rectifies it into a high-voltage DC voltage through a converter station, and then transmits it to the remote end through a transmission cable. After the converter transformer is connected to the grid, this power supply is often used for long-distance power supply of the national public grid. For long-distance power supply, due to the impedance of the line itself, there will be a certain voltage drop on the transmission line, which will cause loss and lead to power loss. Therefore, long-distance power supply usually needs to increase the power supply voltage and adopt high-voltage power transmission.

[0003] In addition, the traditional solution needs to configure a huge power freq...

Examples

Embodiment approach

[0033] Such as figure 1 and figure 2 Shown: The shore-based power conversion equipment is a high-voltage DC power conversion device, which is used to complete the functions of isolation and rectification and boosting.

[0034] The shore-based power conversion equipment includes a three-phase multi-winding transformer and a rectification and step-down module. In this embodiment, the three-phase multi-winding transformer includes a primary winding and eight secondary windings, the input end of the primary winding is connected to the three-phase alternating current, and the eight secondary windings are respectively connected to eight rectifying and step-down modules UP1-UP8. The three-phase AC voltage on the secondary side of the three-phase multi-winding transformer is rectified and stepped down by the rectification and step-down module, and then converted into a DC voltage output. The output terminals of each rectification and step-down module UP1-UP8 are connected in series...