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Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter

A multi-level converter, three-phase module technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the problem of less research on DC power transmission technology, modulation strategy balance control, The key technology of fault protection has not been completely solved and other problems, so as to achieve the effect of being conducive to accurate design

Inactive Publication Date: 2014-12-10
SOUTHEAST UNIV
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Problems solved by technology

[0004] Although the world's first MMC-based HVDC transmission project (Trans Bay Cable Project) undertaken by Siemens was put into commercial operation in the United States in March 2010, the domestic and foreign academic circles have little understanding of MMC-type voltage source converter HVDC transmission technology. There are relatively few studies, and key technologies such as modulation strategy, capacitor voltage balance control, and fault protection have not been fully resolved, and in-depth research is urgently needed

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  • Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter
  • Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter
  • Three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and carrier phase-shifting modulation method of converter

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] A three-phase modular multilevel converter for VSC-HVDC, such as figure 1 As shown, it includes three phase units and a first voltage capacitor, two phase units of the three phase units are connected in parallel with each other and then connected in parallel with the first voltage capacitor and another phase unit; and A current regulator is connected in series on the parallel branch of each phase unit; the phase unit includes two bridge arms connected in parallel, that is, two upper and lower bridge arms form a phase unit. According to the modular design of MMC, The six bridge arms are symmetrical, and the electrical parameters of each sub-module and the reactance value of each bridge arm are the same. The bridge arm includes a reactor L and N sub modules (sub module, SM), N is greater than or equal to 1, and the sub modules and the reactor L are connected in s...

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Abstract

The invention discloses a three-phase modularized multi-level converter for VSC-HVDC (voltage source converter-high voltage DC) and a carrier phase-shifting modulation method of the converter and belongs to the technical field of level converters. The three-phase modularized multi-level converter comprises three phase units and a first voltage capacitor, and two of the phase units are connected with each other at first and connected with the first voltage capacitor and the rest phase unit in parallel; each phase unit comprises two bridge arms connected in parallel, each bridge arm comprises a reactor and N submodules. For N+1-level three-phase modularized multi-level converter, each bridge arm comprises N cascade submodules, N groups of two-level triangular carriers are adopted and phases thereof are sequentially staggered by 2 pi / N degrees. The three-phase modularized multi-level converter cannot generate extra switching loss and loss of the converter caused by power devices can be conveniently estimated.

Description

technical field [0001] The invention relates to a multilevel converter, in particular to a three-phase modular multilevel converter for VSC-HVDC and its carrier phase shift modulation strategy. Background technique [0002] The power industry around the world needs to adopt more flexible, economical and environmentally friendly power transmission and distribution methods to meet technical, economic and environmental challenges. Therefore, the demand for advanced power electronic devices has become increasingly urgent. The technical advantages of voltage source converter-high voltage DC (VSC-HVDC) make it play an important role in renewable energy grid connection, passive network power supply, urban power grid power supply, asynchronous AC grid interconnection and other fields. VSC is the core component of the VSC-HVDC transmission system, and its topology and modulation strategy have a great impact on the operating characteristics of VSC-HVDC and the effectiveness, economy a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H02M7/483
Inventor 余海涛孟高军胡敏强黄磊
Owner SOUTHEAST UNIV
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