Direct current-direct current conversion device

Abstract

The present invention provides a direct current-direct current conversion device. The device includes a direct current-direct current module set and a central control module. The direct current-directcurrent module set includes a plurality of direct current conversion sub-modules. The input ports of the plurality of direct current conversion sub-modules are connected in series with one another sequentially, the output ports of the plurality of direct current conversion sub-modules are connected in series or in parallel with one another sequentially, and the driving ports of the plurality of direct current conversion sub-modules are connected in parallel with one another sequentially, and therefore, the input port, the output port and the driving port of the direct current-direct current conversion device can be correspondingly formed. The central control module controls each direct current conversion sub-module to perform voltage conversion. According to the direct current-direct current conversion device of the invention, a modular manner is adopted, so that the combination of various voltage input parameters and output parameters can be flexibly realized; and small-sized components can be adopted, and therefore, the overall size of the device can be reduced, and the realization of a compact structure can be facilitated.

Description

technical field [0001] The invention relates to a DC-DC conversion device, in particular to a DC-DC conversion device for reducing high-voltage direct current at a higher voltage level to direct current at a medium voltage level. Background technique [0002] Underwater DC micro-power supply network, onshore small-scale DC power distribution system and photovoltaic power generation functional system are different from traditional power grids. These power conversion systems all use DC for power supply and distribution, and it is inevitable to convert high-voltage DC to medium-voltage DC. Due to the special application occasions, especially on the underwater DC micro power supply network, there are special requirements for this type of power conversion system: 1) The input voltage level is high, up to tens of kilovolts; 2) The volume of the power conversion system It is required to be small enough, because it needs to be packaged in a narrow underwater waterproof and pressure-...

AI Technical Summary

Problems solved by technology

The traditional medium and high voltage DC power conversion system is rarely used, and basically uses large components such as thyristors for rectification and conversion. The power conversion system is bulky, does not have internal redundancy, and is difficult to operate fault-tolerantly. It is not suitable for Applied to occasions requiring high volume and redundancy

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