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Transformer-free distributed power router

A router and distributed technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the problem that the bidirectional converter cannot provide multi-channel DC bus input/output, etc. Improve system reliability, improve power conversion efficiency, and improve efficiency

Inactive Publication Date: 2015-04-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantage that the traditional bidirectional converter cannot provide multiple DC bus input / output and needs a transformer, the present invention proposes a transformerless distributed power router that provides multiple DC input / output

Method used

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  • Transformer-free distributed power router

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Embodiment Construction

[0017] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0018] A transformerless distributed power router such as figure 1 As shown, it includes: a modular multilevel converter and a modular voltage divider circuit; where the modular multilevel converter includes three phase units, and each phase unit is composed of an upper bridge arm and a lower bridge arm in series , the positive pole of the upper bridge arm is connected to the positive pole of the modular voltage divider circuit, the negative pole of the upper bridge arm is connected to the positive pole of the lower bridge arm and a certain phase in the power grid, and the negative pole of the lower bridge arm is connected to the negative pole of the modular voltage divider circuit ;

[0019] The upper bridge arm or the lower bridge arm of each phase is composed of n identical sub-modules in series with positive and negative poles and a reactor in series, n is a...

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Abstract

The invention belongs to the technical field of power conversion, and particularly relates to a transformer-free distributed power router. The power router comprises a modular multi-level converter and a modular voltage division circuit, wherein the modular multi-level converter comprises three phase units, each phase unit is formed by connecting an upper bridge arm and a lower bridge arm in series, the positive pole of each upper bridge arm is connected with the positive pole of the modular voltage division circuit, the negative pole of each upper bridge arm is connected with the positive pole of each lower bridge arm and a certain phase in a power grid, and the negative pole of each lower bridge arm is connected with the negative pole of the modular voltage division circuit; each upper bridge arm or each lower bridge arm of each phase is formed by connecting positive and negative poles of n identical sub-modules in series and connecting an electric reactor in series; the modular voltage division circuit is formed by connecting positive and negative poles of k identical sub-modules in series and connecting an electric reactor in series. With the adoption of the power router, the power conversion efficiency can be effectively improved, and multiple channels of direct-current output can be provided; simultaneous connection of various distributed power storage devices can be facilitated by multi-end input, the system reliability is improved, and meanwhile, the efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of power conversion, and in particular relates to a distributed power router without a transformer. Background technique [0002] After the Modular Multilevel Converter (MMC) was proposed, it has the characteristics of its highly modular structure, common DC bus, easy engineering implementation, unbalanced operation capability, fault ride-through and recovery capability, etc. Favored by researchers at home and abroad, it is widely used in high-voltage direct current transmission (High-Voltage Direct Current, HVDC), power quality and other fields by domestic and foreign researchers. play an important role in the construction of [0003] In the traditional example of using a modular multilevel converter to achieve AC / DC bidirectional conversion, in the process of power conversion with a large voltage span, due to the limitation of the duty cycle of the DC / DC conversion, a transformer is needed as a medium to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797
CPCH02M7/797
Inventor 袁敞刘昌徐永海李善颖吴涛贺惠民丛诗学
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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