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A modular unit suitable for large-capacity modular multilevel voltage source converters

A modular multi-level, voltage source converter technology, applied to electrical components, irreversible DC power input conversion to AC power output, AC power input conversion to DC power output, etc., can solve transmission power constraints, Inconvenient maintenance and other problems to achieve the effect of improving protection reliability and efficiency

Active Publication Date: 2017-05-17
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a modular unit suitable for large-capacity modular multi-level voltage source converters, which can solve the problems of current flexible power transmission being restricted by devices and inconvenient maintenance. Based on this modular unit The advanced voltage source converter can increase the transmission power, high equipment efficiency, high reliability of fault protection, and good equipment maintainability

Method used

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  • A modular unit suitable for large-capacity modular multilevel voltage source converters
  • A modular unit suitable for large-capacity modular multilevel voltage source converters
  • A modular unit suitable for large-capacity modular multilevel voltage source converters

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Embodiment Construction

[0023] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The present invention provides a modular unit suitable for large-capacity modular multi-level voltage source converters, including a fixed DC energy storage unit 3 and a separate converter unit 6. image 3 As shown, the separated converter unit 6 includes a bypass switch K1, 4 power semiconductor switching devices T1, T2, T3, T4, 4 power semiconductor switching devices freewheeling diodes D1, D2, D3, D4, voltage equalizing discharge resistors R1 and the secondary control and protection unit KZ1, the fixed DC energy storage unit 3 includes a DC energy storage capacitor or at least 2 DC energy storage capacitors C1-Cn (n≥2); among them, T1 and D1 are connected in antiparallel, T2 and D2 is connected in anti-parallel, and the emitter of T1 is connected to the collector of T2, T3 and D3 are connected in anti-parallel, T4 and D4 are conne...

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Abstract

The invention discloses a module unit suitable for a high-capacity modularized multi-level voltage source converter. The module unit comprises a separated conversion unit and a fixed direct-current energy storage unit which are mutually connected, as well as a bottom plate and a clapboard, wherein the clapboard is movably installed on the bottom plate and capable of doing a reciprocating motion on the bottom plate; the separated conversion unit is installed on the clapboard, and the fixed direct-current energy storage unit is installed on the bottom plate. The structure is capable of solving the problems of device constraint and inconvenient maintenance of transmission power in the present flexible electricity transmission; the voltage source converter based on the module unit is capable of increasing the electricity transmission power; the equipment efficiency is high, the fault protection reliability is high, and the equipment maintainability is good.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, and in particular relates to a converter valve module unit suitable for a large-capacity modular multi-level voltage source converter. Background technique [0002] The core of the flexible DC transmission system is the voltage source converter based on fully controlled devices. Multi-level technology is the optimal solution for realizing high-voltage and large-capacity voltage source converters. Compared with the two-level converter, the multi-level converter can use low-voltage devices to achieve high-voltage level output without direct series connection of switching devices. In recent years, the emergence of Modular Multilevel Converter (MMC) has enabled the successful application of MMC in the field of flexible DC transmission. [0003] The converter valve of the modular multilevel converter adopts a modular design, which is composed of several basic unit sub-modules with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H02M7/48
CPCH02M7/003
Inventor 谢晔源潘淳曹冬明方太勋田杰刘为群李海英陈勇汪涛
Owner NR ELECTRIC CO LTD
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