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MMC sub-module and bypass protection method thereof

A bypass protection and sub-module technology, which is applied to output power conversion devices, electrical components, power transmission AC networks, etc., can solve problems such as reducing the reliability of inverter operation.

Inactive Publication Date: 2021-09-10
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the currently used sub-module bypass switch is an electromagnetic single-drive mechanical structure, there is a certain risk of refusal to operate. When the bypass switch refuses to operate, the inverter needs to stop running, which reduces the reliability of the inverter operation.

Method used

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  • MMC sub-module and bypass protection method thereof
  • MMC sub-module and bypass protection method thereof
  • MMC sub-module and bypass protection method thereof

Examples

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] A converter with a modular multilevel topology, such as figure 1 As shown, the converter includes at least one sub-module, and multiple sub-modules are connected in series. The sub-modules are half-bridge, full-bridge and other topological structures. The sub-modules use an electromagnetic double-drive bypass switch K for bypass protection.

[0023] An MMC submodule such as image 3 , 4 As shown in , the AC end of the sub-module is connected in parallel with an electromagnetic double-drive bypass switch for bypass protection. The closing driving magnetic circuit of the electromagnetic dual-drive bypass switch includes a main driving magnetic circuit and an auxiliary driving magnetic circuit, and triggering either the main driving magnetic circuit or the auxiliary driving magnetic circuit can close the bypas...

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Abstract

The invention discloses an MMC (Modular Multilevel Converter) sub-module and a bypass protection method thereof. A conventional MMC sub-module bypass switch is of an electromagnetic single drive type mechanical structure and has a certain risk of refusing to operate, and when the bypass switch refuses to operate, a converter needs to stop operating, so that the operating reliability of the converter is reduced. According to the technical scheme, when the MMC sub-module breaks down, reliable bypass of the faulted MMC sub-module is achieved through an electromagnetic dual-drive bypass switch, and the operation reliability of the converter is improved.

Description

technical field [0001] The invention relates to the field of flexible DC power transmission and distribution, in particular to an MMC sub-module and a bypass protection method thereof. Background technique [0002] Flexible DC transmission technology can be applied to distributed renewable energy grid connection, power supply in islands and urban load-intensive areas. Voltage source modular multilevel converters based on fully controlled power electronic switching devices are widely used in the field of flexible direct current transmission. Modular Multilevel Converter (MMC) achieves high voltage output by connecting several MMC sub-modules in series, does not require direct cascading of switching devices, and has low requirements for consistent triggering of devices. In addition, it has good scalability, Low switching frequency, low operating loss, high quality output voltage waveform and many other advantages. [0003] When the MMC sub-module fails, it needs to perform b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02J3/36
CPCH02M1/32H02J3/36Y02E60/60
Inventor 谢晔源朱铭炼欧阳有鹏殷冠贤
Owner NR ELECTRIC CO LTD