Isolation type DC/DC (direct current/direct current) converter based on modularized multilevel current converter

A modular multi-level, inverter technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc. Restricted thyristor withstand voltage and other problems, to achieve the effect of high voltage level, reduced volume and cost, and low harmonic content

Inactive Publication Date: 2013-09-04
CHINA EPRI ELECTRIC POWER ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, resonance technology is widely used in small and medium power DC/DC converters. It has simple structure, convenient control, and high efficiency, but it cannot block the propagation of faults, and it is difficult to debug resonance parameters. At the same time, it is limited by the with

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  • Isolation type DC/DC (direct current/direct current) converter based on modularized multilevel current converter
  • Isolation type DC/DC (direct current/direct current) converter based on modularized multilevel current converter

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Embodiment Construction

[0018] The present invention will be further described in detail below in conjunction with the drawings.

[0019] Such as figure 1 , The present invention provides an isolated DC / DC converter based on a modular multilevel converter. The converter includes a modular multilevel converter at an input end, a high frequency transformer and a modular multilevel converter at an output end. The input end modular multilevel converter is connected with the output end modular multilevel converter through a high frequency transformer. The magnetic core of the high-frequency transformer is made of iron-based amorphous alloy material.

[0020] The input modular multilevel converter and the output modular multilevel converter both include MMC sub-modules.

[0021] Such as figure 2 The MMC sub-module includes a DC capacitor, two IGBT chips, two voltage equalizing resistors, and a thyristor; wherein, two IGBT chips are connected in series to form an IGBT chip series branch, and two voltage equaliz...

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Abstract

The invention provides an isolation type DC/DC (direct current/direct current) converter based on a modularized multilevel current converter. The converter comprises an input end modular multilevel current converter, a high-frequency transformer and an output end modular multilevel current converter, wherein the input end modular multilevel current converter is connected with the output end modular multilevel current converter through the high-frequency transformer. The input end modular multilevel current converter and the output end modular multilevel current converter respectively adopt MMC (multi media card) sub modules, high voltage is born, the voltage level is high, the transmission capacity is great, the expandability is high, in addition, the alternating current conversion link waveform distortion factor in the middle process is small, the harmonic wave content is low, and the electric isolation can be effectively realized on the input and output side of the converter.

Description

Technical field [0001] The invention belongs to the technical field of power electronics, and specifically relates to an isolated DC / DC converter based on a modular multilevel converter. Background technique [0002] With the application of multi-terminal flexible DC and DC grid technologies based on voltage source converters (VSC), DC / DC converters have become one of the key equipment for constructing DC grids. In the AC system, the AC transformer uses the principle of electromagnetic induction. When the primary coil has an AC transformer schematic flow, AC magnetic flux is generated in the iron core (or magnetic core), causing a voltage (or current) to be induced in the secondary coil. ). In the DC system, the voltage does not change direction, so the voltage conversion of the DC system is far more difficult than the breaking of the AC current. [0003] As one of the key equipment of the DC grid, the main functions of the DC / DC converter should include: ①Realize the connection ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 罗湘曹均正汤广福魏晓光刘杰
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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