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MMC sub-module with direct-current short-circuit fault self-removing function

A DC short-circuit and self-clearing technology, which is applied in the conversion devices and instruments that convert DC power input into DC power output and output power, can solve the problems of reducing the number of switches and increasing the number of devices, and achieves a reduction in the number of switches. , the effect of low loss

Inactive Publication Date: 2014-12-24
SOUTH CHINA UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Clamped twin sub-blocks have fewer switches than full-bridge sub-blocks, but still a lot of devices

Method used

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  • MMC sub-module with direct-current short-circuit fault self-removing function
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  • MMC sub-module with direct-current short-circuit fault self-removing function

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Embodiment Construction

[0015] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto. If there are control processes that are not specifically described in detail below, those skilled in the art can refer to the prior art to realize.

[0016] refer to Figure 4 , a kind of MMC sub-module with DC short-circuit fault self-clearing capability of the present invention consists of a first switching tube T 1 , the second switching tube T 2 , the third switching tube T 3 , the fourth switching tube T 4 , the fifth switching tube T 5 , diode D, first capacitor C 1 and a second capacitor C 2 constitute; the switch tube is an IGBT; the port voltage of the MMC sub-module is u SM , the input current of the MMC sub-module is i SM ; the first capacitance C 1 The voltage is U C1 ...

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Abstract

The invention provides an MMC sub-module with the direct-current short-circuit fault self-removing function. The MMC sub-module is composed of a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a diode, a first capacitor and a second capacitor, wherein the switching tubes are IGBTs. The working process of the MMC sub-module is equivalent to the working process of two half-bridge modules, loss is low, the direct-current side fault self-removing capacity of a direct-current transmission system is achieved, and the number of devices forming the MMC sub-module is small. Compared with an existing half-bridge sub-module, the MMC sub-module has the direct-current side fault self-removing capacity of the direct-current transmission system; compared with an existing full-bridge sub-module, the number of the switching tubes is reduced; compared with an existing two-clamping-position sub-module, one diode is omitted, the number of the switching tubes which are powered on in the working process is reduced, and loss is low.

Description

technical field [0001] The invention relates to the field of combined module multilevel converters, in particular to an MMC sub-module with self-clearing capability for DC short-circuit faults. Background technique [0002] With the continuous development of HVDC transmission, multilevel converters have been greatly developed. Among them, the modular multilevel converter (Modular Multilevel Converter, MMC) is a new type of multilevel topology. In addition to the advantages of the traditional multilevel converter, the modular multilevel converter adopts a modular structure design. It is convenient for system expansion and redundant work; it has unbalanced operation capability, fault ride-through and recovery capability, and high system reliability; due to the common DC bus, the module combined multilevel converter is especially suitable for high-voltage direct current transmission system applications. [0003] At present, MMC sub-modules mainly include half-bridge sub-module...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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