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Novel paralleled half-full bridge sub-module MMC topology

A sub-module and parallel technology, applied in the field of power transmission and distribution, can solve the problem of large amount of calculation of capacitance and voltage data, and achieve the effect of ensuring the ability to clear DC faults

Inactive Publication Date: 2018-03-13
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

At present, the commonly used sub-module capacitor voltage equalization method is sorting voltage equalization. However, with the development of MMC towards higher levels in the future, under the fast and accurate requirements for sensors and controllers, too much capacitor voltage data will bring huge The amount of calculation, which will pose a challenge to the hardware design of the system

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  • Novel paralleled half-full bridge sub-module MMC topology
  • Novel paralleled half-full bridge sub-module MMC topology
  • Novel paralleled half-full bridge sub-module MMC topology

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Embodiment Construction

[0014] In order to further illustrate the performance and working principle of the present invention, the composition and working principle of the invention will be described in detail below in conjunction with the accompanying drawings.

[0015] figure 1 It is a parallel half-bridge-full-bridge hybrid MMC sub-module topology, which is obtained by parallel reconstruction of a full-bridge structure and an inverted half-bridge structure. A P-HFBSM contains 6 IGBT switch groups and 1 capacitor, which retains the voltage output capability of the HBSM. Under normal operation, a single P-HFBSM can output 0, U C Two levels. Hereinafter, "1" indicates that the IGBT switch is turned on, and "0" indicates that it is turned off. The sub-module outputs 0 level, that is, the current path of the bypass is as follows: figure 2 Shown, T 1 ~T 6 The corresponding switch state is 100110 in turn; the sub-modules are connected in series U C level current paths such as image 3 Shown, T ...

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Abstract

The invention provides a novel paralleled half-full bridge sub-module (Paralleled Half-Full Bridge Sub-module, P-HFBSM) MMC topology. One half of a P-HFBSM is of a full-bridge structure and the otherhalf is of a half-bridge structure; and a sub-module capacitor is arranged in the middle of the two structures. The novel MMC topology has the full-bridge structure, so that the novel MMC topology hasDC fault ride-through capability. Through certain IGBT control, overall self-equalizing can be achieved through the novel sub-module, so that the novel MMC topology does not depend on a sorting equalizing algorithm, the control pressure of a controller is reduced and the switching loss can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a novel parallel half-bridge-full-bridge hybrid sub-module MMC topology. Background technique [0002] As a topology of the voltage source converter, the modular multilevel converter is gradually occupying an increasingly important position in the field of HVDC transmission because it does not have problems such as commutation failure. [0003] A. Lesnicar and R. Marquardt first proposed the Half-bridge Sub-Module (HBSM) topology in 2003. Because HBSM requires fewer semiconductor devices and is economical, most MMC-HVDC projects currently use a half-bridge sub-module structure. However, the half-bridge MMC does not have the ability to clear the DC fault current. When the large-capacity DC circuit breaker technology is not mature, the interruption of the fault current on the DC side depends on the blockage of the converter station and the t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 赵成勇赵禹辰冯谟可许建中
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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