Long-distance seabed high-voltage DC power supply system

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.

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...

AI Technical Summary

Problems solved by technology

[0003] In addition, the traditional solution needs to configure a huge power frequency isolation transformer, power frequency rectification and voltage regulation device

Its typical disadvantages are that the power frequency transformer is bulky and the dynamic response speed of the power frequency rectification and voltage regulating device is slow, which cannot meet the requirements of fast adjustment of the output according to the load change when the remote terminal load changes, so that it cannot be realized in the terminal load. The function of constant voltage and constant current fault mode operation when a fault occurs, and the noise of the power frequency transformer is large

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