DC converter for subsea power supply and its control method

Abstract

The invention discloses a DC converter for subsea power supply and its control method, which comprises a bypass part, a high-frequency switch part, a transformer part, a rectification part and a filter part; the bypass part includes an input inductance and a plurality of identical The bypass circuit; the high-frequency switch part includes a plurality of identical high-frequency switch circuits; the transformer part includes a plurality of identical high-frequency transformers; the rectification part includes a plurality of identical rectification circuit groups; the filter part includes a plurality of identical filter circuits , the filtering circuit is connected in one-to-one correspondence with the series output rectifying circuit group. The automatic redundant switching and self-adaptive voltage regulation control method of the present invention can realize functions such as rapid automatic switching and input voltage self-adaptation, and is especially suitable for submarine power supply occasions.

Description

technical field [0001] The invention relates to power electronic circuit technology, in particular to a DC converter for subsea power supply and a control method thereof. Background technique [0002] The ocean observation network is an important guarantee for ocean exploration and development, and is of great significance to marine scientific research, environmental monitoring, resource detection, and disaster prevention and control. The medium-voltage DC remote power supply system is the guarantee for the power supply of the submarine observation network. The subsea power supply part of the medium-voltage DC remote power supply system needs to withstand a wide input voltage range and a high voltage level, and at the same time have high requirements for reliability and volume. Restricted by the voltage level of a single power device, although the series connection of devices can simply solve the problem of high voltage, the reliability is greatly reduced. At present, the c...

AI Technical Summary

Problems solved by technology

Limited by the voltage level of a single power device, the use of devices in series can easily solve the problem of high voltage, but the reliability is greatly reduced

At present, the commonly used solution is to use multi-module series-parallel combination to solve the contradiction between high-voltage and high-power requirements and the limitation of a single power device. However, the internal switch part of a single module generally adopts a resonant bridge structure. There are many power devices in this structure. There is the possibility of direct connection of the bridge arm, and the added resonant circuit will further increase the size and other disadvantages, and the voltage regulation range is limited by the switching frequency

If the input side bypass redundancy function is lacking or a large mechanical DC circuit breaker is used, the reliability of the subsea power supply will be reduced or the volume of the entire device will be increased.

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