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A mmc converter sub-module circuit with DC fault self-clearing capability

A DC fault and sub-module technology, applied in emergency protection circuit devices, output power conversion devices, AC power input conversion to DC power output, etc., can solve the problem of increasing system control complexity, increasing the use of switching power devices, sub-modules, etc. Problems such as the complex structure of the module circuit, to achieve the effect of improving reliability and economy

Inactive Publication Date: 2020-04-17
TIANJIN UNIV
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Problems solved by technology

These structures usually greatly increase the use of switching power devices, and make the sub-module circuit structure more complex, increase the control complexity of the system, and reduce the reliability of the system
Especially for the MMC direct current transmission system based on the half-bridge structure that has been built, these methods require a complete replacement of the MMC converter station, which is not feasible in terms of economy and engineering practice

Method used

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  • A mmc converter sub-module circuit with DC fault self-clearing capability
  • A mmc converter sub-module circuit with DC fault self-clearing capability
  • A mmc converter sub-module circuit with DC fault self-clearing capability

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Embodiment Construction

[0014] The invention proposes a new type of MMC sub-module circuit with DC fault self-clearing capability, while reducing the number of additional components as much as possible and not increasing the complexity of the system, it ensures that the structure can be automatically cut off quickly and reliably by means of a blocking action after a DC side fault DC fault current, and can be more conveniently applied to the established half-bridge structure MMC converter station. This not only improves the reliability of the MMC converter station, but also improves its economy. The present invention can be realized through the following technical solutions:

[0015] The specific topology is as figure 1 shown.

[0016] This topology is based on the traditional half-bridge MMC structure, and the sub-modules SM1 and SM2 of the two half-bridge structures are connected in reverse series to form a structural unit, so this structure is named reverse series dual sub-module (RSDSM) structur...

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Abstract

The invention belongs to the field of relay protection and automation of electric power systems, and relates to an MMC converter submodule circuit with a direct-current fault self-clearing capability.Sub-modules SM1 and SM2 of two half-bridge structures are reversely connected in series to form a structure unit. Each sub-module of each half-bridge structure comprises three parallel lines, of which one path is a capacitor C, another path is two diodes D1 and D2 which are connected in series, and still another path is two IGBTs which are connected in series. The cathode of the first diode D1 isconnected with the anode of the second diode D2. The emitting electrode of the first IGBT is connected with a collector electrode of the second IGBT, the anode of the first diode D1 is connected withthe anode of the first IGBT, and the collector of the first IGBT is connected with the positive electrode of the capacitor C. The rated capacitor voltage of one of the sub-modules is 2 Udc, the ratedcapacitor voltage of the other sub-module is Udc, and the directions of the capacitor voltage of the two sub-module are opposite to each other so as to form a reverse voltage for stopping the diodes.

Description

technical field [0001] The invention relates to the field of relay protection of electric power systems, and relates to an MMC DC side fault isolation technology. Background technique [0002] In recent years, my country's wind power, photovoltaic power generation and other renewable energy installed capacity has continued to expand, making the power generation center far away from the load center. The high-voltage direct current transmission method has gained great attention and development because it is suitable for long-distance and large-capacity power transmission. At present, VSC converters with active and reactive power independent control properties are widely used in practical projects of flexible HVDC transmission. The MMC converter is a new type of VSC structure with a modular topology. Its advantages are high output voltage level, low switching loss and good output voltage waveform. It is the development direction of flexible DC power transmission in the future....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M7/217H02H7/125
CPCH02H7/125H02M7/2173H02M7/219
Inventor 薛士敏崔淼廉杰范勃旸齐金龙
Owner TIANJIN UNIV
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