Seabed medium-voltage direct-current power distribution device

Abstract

The invention relates to a seabed medium-voltage direct-current power distribution device. The seabed medium-voltage direct-current power distribution device comprises an internal functional unit and a pressure-resisting seal cavity, the internal functional unit is installed in the pressure-resisting seal cavity, the pressure-resisting seal cavity is formed by sequentially connecting a front end cover, a cylinder and a rear end cover, and a first water seal connector and a second water seal connector are installed on the front end cover; the inner functional unit comprises a heat dissipation support and comprises an external interface power supply control module, an external interface state detection module, a first medium and low voltage direct-current conversion module, a medium-voltage bus monitoring module, a second medium and low voltage direct-current conversion module, an internal environment state monitoring module, an internal load monitoring module, an Ethernet switch and a PC / 104 main controller which are installed on the heat dissipation support. Electric energy distribution is controlled flexibly, the own operation state is monitored, the power distribution device is simple in structure, good in heat dissipation performance, suitable for various large-size high-power application occasions and capable of reducing the environment temperature of an internal functional circuit, and improving reliability and stability of long-term operation.

Description

technical field [0001] The invention belongs to the technical field of seabed electric power, and relates to a seabed medium-voltage direct current distribution device, in particular to a device for distributing medium-voltage direct current power output from a seabed substation to various seabed electric loads. Background technique [0002] At present, in the fields of marine scientific research, disaster warning and resource development, the number of submarine equipment is increasing, the coverage area is wider and wider, the power consumption of operation is increasing, and the continuous operation time is longer and longer. Therefore, the traditional ship-based ocean detection method has been difficult to meet the demand, and only through a special submarine power grid can the continuous power supply problem of a large number of submarine equipment be solved. In this type of submarine power grid, the subsea high-voltage DC substation device is the first-stage step-down ...

AI Technical Summary

Problems solved by technology

[0003] The existing devices have low controllability to the power distribution of electric loads, and the ability to monitor their own operating status is weak

In addition, existing devices generally adopt four methods of heat dissipation: traditional end cover heat dissipation, natural close heat dissipation, elastic close heat dissipation and oil-filled heat dissipation: since the subsea pressure-resistant sealed cavity is usually a hollow long cylinder structure, the end cover is usually Watertight connectors are installed, so the available end cover area is extremely limited, the application surface of the end cover heat dissipation method is narrow, and the installation space utilization rate inside the cavity is low; the effect of the natural heat dissipation method depends on the internal heat dissipation bracket and the inner wall of the cavity Effective contact between the two, the tighter the fit, the better the heat dissipation effect, but it will cause extremely difficult assembly, and the processing technology is usually difficult to meet the requirements; the elastic close heat dissipation method relies on the elastic structure to make the internal heat dissipation bracket and the inner wall of the cavity. The contact is good, because the internal support of the large-scale device is heavy, the design requirements for the elastic structure are high, and the installation is difficult due to the large elastic coefficient; the oil-filled heat dissipation method is to fill the cavity with insulating oil for convection heat dissipation, and the heat dissipation effect is good. However, the pressure applied to the functional circuit and sealing structure in the cavity will increase with the rise of oil temperature, so a larger oil pressure compensator must be installed, which greatly reduces the utilization of the installation space inside the cavity, and some components The device will accelerate aging after long-term oil immersion

Due to the poor heat dissipation structure of the existing device, the power that can be provided to the seabed electrical load is relatively limited, and the reliability and stability are greatly reduced

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