High-voltage AC/DC power conversion device and control method thereof

A technology of electric energy conversion, AC and DC, applied in the direction of irreversible DC power input conversion to AC power output, etc., can solve problems such as system loss and investment reduction, system loss and investment increase, complex energy balance control, etc., to achieve waveform quality High, low filter capacity, low loss effect

Active Publication Date: 2017-01-04
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In order to further extend the flexible DC technology to the overhead line system, the half-bridge sub-module structure ( figure 1 (a)) replaced by a full-bridge sub-module structure ( figure 1 (b)), however, this method causes system loss and a substantial increase in investment, making it difficult to meet engineering needs
[0004] Aiming at the topological structure of the cable system application, the "HYBRID 2-LEVEL ANDMULTILEVEL HVDC CONVERTER" of the patent US 20130128629A1 proposes a new type of converter structure, which can greatly reduce the semiconductor devices and capacitors used, but the control method is complicated and has Many technical problems are difficult to solve;
[0005] Aiming at the application requirements of the overhead line system, the "AMultilevel Converter with HybridFull Bridge Cells" of the patent WO2014/111164A1 proposes to change the bridge arm into a half-bridge and full-bridge hybrid structure, which reduces the system loss and investment; the "AMultilevel Converter with HybridFull Bridge Cells" of the patent WO2011/098117A1 "Converter for High voltage DC Transmission" proposes an inverter bridge arm converter, which realizes electric energy conversion by combining two-level and modular multi-level structures, but requires complex and precise energy balance control, which is actually realized more difficult

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  • High-voltage AC/DC power conversion device and control method thereof
  • High-voltage AC/DC power conversion device and control method thereof
  • High-voltage AC/DC power conversion device and control method thereof

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[0034] Example

[0035] The invention provides a high-voltage AC and DC power conversion device, which is composed of a three-phase structure, each phase is a single-phase conversion structure, and the single-phase structure is composed of upper and lower bridge arm conversion units.

[0036] The bridge arm conversion unit structure is composed of a device cascade structure and a sub-module cascade structure, including three implementation modes:

[0037] 1) Such as figure 2 (a) and (a'), the two sets of device cascade structure and submodule cascade structure are connected in a star shape, the other end of the device cascade structure S1p (S2n) is connected to the AC terminal, and the other group of device cascade structure S2p The other end of (S1n) is connected to the DC positive (negative) terminal; the other end of the sub-module cascade structure SMp (SMn) is connected to the ground point.

[0038] 2) Such as figure 2 (b) and (b'), the two sets of device cascade structure and sub

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Abstract

The invention relates to a high-voltage AC/DC power conversion device, which is formed by a three-phase structure. Each single-phase structure is formed by connecting upper and lower two bridge arm transform units. Each bridge arm transform unit is formed by two groups of device cascade structures and a submodule cascade structure. According to the technical scheme, switching operation is carried out on cascaded sub-modules through the device cascade structure, and thus AC/DC power conversion is realized; and self removal of DC fault can be realized through a full-bridge submodule structure, thereby meeting application requirements of overhead lines.

Description

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Claims

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Application Information

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Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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