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Method for setting up modularized multi-level converter composite structure model

A technology of multi-level converter and hybrid structure, which is applied in the field of power transmission and distribution, can solve the problems that restrict the application of FBMMC engineering, and achieve the effect of strong DC fault ride-through capability, technology and cost

Active Publication Date: 2013-02-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] In order to solve this problem, Professor R. Marquardt, the founder of the HBMMC topology, introduced a full-bridge MMC (Full-BridgeMMC, FBMMC) structure in his thesis that can traverse severe DC faults. Each full-bridge sub-module (Full-BridgeMMC) Bridge Sub-module, FBSM) can output three levels, which can interrupt the bridge arm current in any direction, and can change the DC bus voltage polarity of MMC, but it requires double the number of semiconductor devices
Since FBMMC requires twice as many semiconductor devices as HBMMC, this seriously restricts the engineering application of FBMMC, which is why the current MMC-HVDC project adopts the half-bridge structure.

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  • Method for setting up modularized multi-level converter composite structure model
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Embodiment Construction

[0016] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0017] figure 1 It is a topological structure diagram of a general modular multilevel converter MMC provided by the present invention. figure 1 Among them, A, B and C respectively represent the three phases of the AC side of the MMC converter; SM1, SM2, ..., SMn, represent the first sub-module, the second sub-module, ..., the nth sub-module in a certain bridge arm of the MMC; L represents the bridge arm reactor; Udc represents the voltage difference between the positive and negative DC bus bars of the MMC.

[0018] figure 2 It is the sub-module topology structure of the half-bridge structure MMC provided by the present invention and its current path when the fault is locked. figure 2 middle, T 1 and T 2 respect...

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Abstract

The invention discloses a method for setting up a modularized multi-level converter composite structure model in the field of power transmission and distribution technology. Firstly, sub-modules on each bridge arm of a half-bridge converter HBMMC are divided into groups, and the sub-modules in an upper group are changed into full-bridge sub-module FBSM structures, and the sub-modules in a lower group are changed into half-bridge sub-module HBSM structures. Secondly, the upper group and the lower group of every bridge arm are respectively subjected to sequencing gating, and the group in full-bridge sub-module HBSM structures is switched on through adoption of an alternative breakover control method. Finally, six bridge arm electric reactors on a modularized multi-level converter are respectively connected with a discharging access in parallel mode. The method has the advantages that the modularized multi-level converter composite structure model is strong in direct current fault ride-through capability, and simultaneously does not need so many semiconductors like a full-bridge modularized multi-level converter FBMMC, and achieves good uniformity in technology and cost.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a method for establishing a hybrid structure model of a modular multilevel converter. Background technique [0002] Modular multilevel converters (MMCs) have been successfully used in high-power converters, mainly in the field of high voltage direct current (HVDC) transmission. Compared with traditional two-level and three-level voltage source converter HVDC (Voltage Source Converter based HVDC, VSC-HVDC), modular multilevel converter HVDC (ModularMultilevel Converter based HVDC, MMC- HVDC) has many advantages: the AC side and the DC side can be fully controlled, the DC bus does not need to install capacitors, the power electronic equipment has the ability to operate redundantly after a fault, no need to install AC filters, etc. Due to the unique advantages of MMC, MMC-HVDC has become the development trend in the field of HVDC in the futur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49
Inventor 赵成勇刘兴华王朝亮彭茂兰刘济豪郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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