High-voltage DC-DC conversion device

Abstract

The invention relates to a high-voltage DC-DC conversion device comprising a cascade modular converter, a double-winding medium- and low-frequency sinusoidal transformer and an input parallel modular converter. The cascade modular converter comprises two bridge arms the same in structure. Each of upper and lower half bridge arms comprises at least two positive half-bridge topology power modules and a reactor. The double-winding medium- and low-frequency sinusoidal transformer comprises a high-voltage primary winding and a low-voltage secondary winding coupled to each other. Two leads of the high-voltage primary winding are connected to two contacts of the two bridge arms respectively. The input parallel modular converter comprises a modular converter submodule or at least two mutually parallel modular converter submodules. The input end of every submodule is connected to the low-voltage secondary winding. The high-voltage DC-DC conversion device has the advantages that the problems of voltage withstanding, voltage sharing and insufficient transmission capacity in high-voltage switching devices of the existing equipment are solved; the high-voltage DC-DC conversion device is significant to quickening the utilization and marketization progress of high-voltage DC-DC conversion devices.

Description

technical field [0001] The invention relates to a device for converting and transmitting high-voltage direct current-direct current energy, in particular to a high-voltage direct-current-direct current conversion device. Background technique [0002] High-voltage direct current (HVDC) transmission has the characteristics of large transmission power capacity, small loss, long transmission distance and good stability, and has broad application prospects. In order to adapt to the direct application of high-voltage direct current transmission to electrical equipment in the future, it is necessary to have a DC transformer device with a similar function as an AC isolation transformer to convert high-voltage direct current into isolated low-voltage direct current that meets the requirements of electrical equipment. [0003] Since the withstand voltage value of a single power semiconductor device is usually limited, a single power semiconductor device cannot be directly applied to h...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a high-voltage DC-DC conversion device, which can solve the problems of high-voltage side switching devices in existing equipment in terms of withstand voltage, voltage equalization and insufficient transmission capacity, and accelerate the practical application of high-voltage DC-DC conversion equipment and the process of marketization are of great significance

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