MMC topology structure applied to flexible direct current power transmission

A topology and capacitance technology, applied in output power conversion devices, electrical components, emergency protection circuit devices, etc., can solve problems such as loss, MMC cannot effectively block DC faults, etc., and achieve the effect of suppressing fault current.

Inactive Publication Date: 2017-06-20
TBEA SUNOASIS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the MMC formed by cascading half-bridge sub-modules cannot effectively block DC faults. Therefore, once a DC fault occurs, electronic devices such as IGBTs and diodes will inevitably be burned, resulting in great losses.

Method used

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  • MMC topology structure applied to flexible direct current power transmission
  • MMC topology structure applied to flexible direct current power transmission
  • MMC topology structure applied to flexible direct current power transmission

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Embodiment Construction

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, the embodiment of the present invention provides a MMC (Modular Multilevel Converter, modular multilevel converter) topology applied to flexible direct current transmission, which includes three phase units, respectively A phase unit and B phase unit As for the C-phase unit, each phase unit includes an upper bridge arm and a lower bridge arm. The upper bridge arm and the lower bridge arm of each phase unit have the same structure, and both include reactors L and n sub-modules connected in series in sequence. The number of sub-modules of each phase unit is determined by factors such as the DC bus voltage, the withstand voltage level of electronic devices, and the type of sub-modules at the beginnin...

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Abstract

The invention provides a MMC topology structure applied to flexible direct current power transmission. The structure comprises three phase units. Each phase unit comprises an upper bridge arm and a lower bridge arm. The upper bridge arm and the lower bridge arm of each phase unit comprise reactors which are connected in series and a plurality of submodules. Each submodule comprises a first half-bridge circuit, a second half-bridge circuit and a guiding transistor which are connected to each other. The first half-bridge circuit and the second half-bridge circuit comprise offset capacitors. The topology structure also comprises a control unit which is used for determining whether a system has a direct current fault, making the guiding transistor in each first submodule be turned off when the system is determined to have the direct current fault and making a fault current flow through the offset capacitor of the first half-bridge circuit of each first submodule and the offset capacitor of the second half-bridge circuit and then flow into a fault point so as to restrain the fault current. In the invention, when the direct current fault is generated, the fault current is effectively reduced and an electronic device can be prevented from being burnt.

Description

technical field [0001] The invention relates to the technical field of flexible DC power transmission and distribution, in particular to an MMC topology applied to flexible DC power transmission. Background technique [0002] Flexible DC transmission technology is an important part of building a smart grid. Compared with traditional power transmission methods, flexible DC transmission has strong technical advantages in island power supply, urban distribution network expansion and transformation, AC system interconnection, and large-scale wind farm grid connection. It is a strategy to change the development pattern of large power grids. choose. [0003] Voltage Source Converter High-Voltage Direct Current (VSC-HVDC, Voltage Source Converter High-Voltage Direct Current) technology based on Voltage Source Converter (VSC, Voltage Source Converter) and Pulse Width Modulation (PWM, Pulse Width Modulation) technology is The commanding heights in the application field of power ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02M1/32
CPCH02H7/268H02M1/32H02M1/325
Inventor 李战龙侯丹刘伟增黎小林陈名郝翔秦健
Owner TBEA SUNOASIS
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