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
CN103280977AInactive Publication Date: 2013-09-04CHINA EPRI ELECTRIC POWER ENG CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA EPRI ELECTRIC POWER ENG CO LTD
Publication Date
2013-09-04
Estimated Expiration
Not applicable · inactive patent

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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.
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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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