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A DC voltage conversion device and its bridge arm control method

A technology of DC voltage and control method, which is applied in the direction of converting DC power input into DC power output, output power conversion device, and adjusting electric variables, etc., to achieve the effect of high voltage and current quality, low loss level, and low investment

Active Publication Date: 2018-07-17
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The "Bidirectional Unisolated DC-DC converter based on cascaded cells" patent document WO2013 / 026477 A1 proposes a modular multi-level structure based on direct conversion from DC to DC, eliminating the need for transformers and effectively reducing investment and occupancy ground, but the output on the low-voltage side still requires a larger reactor or conjugate reactor, and for fault isolation, an additional full-bridge sub-module is required

Method used

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  • A DC voltage conversion device and its bridge arm control method
  • A DC voltage conversion device and its bridge arm control method
  • A DC voltage conversion device and its bridge arm control method

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Embodiment Construction

[0037] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0038] The present invention provides a DC voltage conversion device, the structure of which is as follows: the device includes a basic conversion unit, and the basic conversion unit forms a unipolar structure or a bipolar structure to realize the conversion of DC electric energy. The bipolar structure diagram is as follows Figure 7 shown.

[0039] The basic conversion unit is composed of two-phase or multi-phase basic functional modules connected in parallel; through the bridge arm control method, the conversion of DC electric energy is realized. image 3 It is the basic functional module of the device, which is composed of two device cascading structures and a sub-module cascading structure, and the three are connected into a star structure. The remaining end of one device cascade structure is connected to the posit...

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Abstract

The invention relates to a DC voltage conversion device and a bridge arm control method thereof. The device comprises a basic conversion unit, and a monopolar structure or a bipolar structure is formed by the basic conversion unit, thereby realizing DC energy conversion. The basic conversion unit is formed by two phases or multiple phases of basic function modules in parallel. Through a bridge arm control method, DC energy conversion is realized. Through adopting a method of combining a full-control device serial connection structure and sub module cascading, the topology realizes voltage conversion in a condition of no transformer, soft switching of serially-connected devices can also be realized, and the investment and the land occupation are reduced.

Description

technical field [0001] The invention relates to a DC-DC conversion device and a control method thereof, in particular to a DC voltage conversion device and a bridge arm control method thereof. Background technique [0002] There have been many reports on DC-DC converters. In the direction of modular multi-level technology suitable for high-voltage fields and with good scalability, the "face-to-face" modular multi-level transformer is the most basic topology. The topology occupies a large area, and the cost is high and the loss is large, so it is difficult to promote and apply it on a large scale. [0003] WO2014 / 056540 A1 patent document "Modular Multilevel DC / DC converter for HVDC applications" discloses a novel DC-DC transformer topology, which discloses that by sharing two-terminal modules in the "face-to-face" topology, the The number of sub-modules invested in the small system, loss and land occupation, but the transformer must be used to isolate the potential. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 杨杰贺之渊汤广福庞辉李强
Owner STATE GRID CORP OF CHINA
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