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Modular multi-level converter combined with series-parallel connection multiplexing

A Modular Multilevel, Multiplexing Technology

Inactive Publication Date: 2019-04-12
XI AN JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0003] However, limited by the maximum current limit of the power switching device IGBT in the sub-module, the current flexible DC transmission system can only achieve large-capacity power transmission by increasing the DC voltage level, which will increase the cost of system insulation and overvoltage design

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  • Modular multi-level converter combined with series-parallel connection multiplexing
  • Modular multi-level converter combined with series-parallel connection multiplexing
  • Modular multi-level converter combined with series-parallel connection multiplexing

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Embodiment Construction

[0020] The present invention is described in further detail below in conjunction with accompanying drawing:

[0021] The converter topology proposed by the present invention is as follows: in the original MMC topology, the connection mode of the sub-modules not only adopts the voltage series multiplexing technology, but also adds a parallel connection of multiple IGBT half-bridge modules and coupling reactors to the sub-modules Multiple connections. figure 1 Given the internal topology of a submodule, figure 1 The medium power supply represents the equivalent voltage source of the IGBT half-bridge module, because there are n half-bridge modules, and there are correspondingly n equivalent voltage sources (V oa , V ob ,...,V om ),in, figure 1 Among them, the o terminal is the input terminal connected to the negative pole of the capacitor, and the A terminal is the output terminal.

[0022] Specifically, the series-parallel multiplex combination modular multilevel converter ...

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Abstract

The invention discloses a modular multi-level converter combined with series-parallel connection multiplexing, and the converter includes several sub-modules which are connected in a series connectionmultiplexing mode, and each sub-module includes n half-bridge modules and n double-coupled reactors, wherein n half-bridge modules and n double-coupled reactors in each sub-module are connected in aparallel connection multiplexing manner, and the converter can withstand larger current, and has good harmonic performance and high operation efficiency.

Description

technical field [0001] The invention belongs to the design field of high-power electric power conversion devices, and relates to a modularized multilevel converter combining series and parallel multiplexing. Background technique [0002] With the development of power electronics technology, the high-voltage direct current transmission (VSC-HVDC) based on the voltage source converter has attracted more and more attention. Compared with the LCC-HVDC, the VSC-HVDC is more flexible, and the active power of the AC port It can be independently adjusted with reactive power to achieve unity power factor operation without additional filters and reactive power compensation. These advantages make it suitable for safe and efficient grid management. Modular multilevel converter (MMC) is the most concerned VSC topology. Compared with two-level VSC or other multilevel converters, MMC has the following significant advantages: Modularity and scalability make it Can meet the requirements of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365Y02E60/60
Inventor 孟永庆方国华李凯凯于建洋潘茜茜
Owner XI AN JIAOTONG UNIV
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