Fault self-clearing MMC sub module and converter with same

A self-cleaning, sub-module technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve the problem of high cost, reduce construction costs, reduce the number of components, reduce effect of investment

Inactive Publication Date: 2017-11-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a fault self-clearing MMC sub-module and a commutator with the sub-module, which can overcome the defects of high cost caused by the number of devices and electrical stress while realizing fault current self-clearing. device

Method used

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  • Fault self-clearing MMC sub module and converter with same
  • Fault self-clearing MMC sub module and converter with same
  • Fault self-clearing MMC sub module and converter with same

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Embodiment Construction

[0023] A fault self-clearing MMC sub-module of the present invention will be described in detail below in combination with embodiments and drawings.

[0024] Such as figure 1 As shown, a fault self-clearing MMC sub-module of the present invention includes first switches K connected in series in turn 1 , the second switch K 2 , the third switch K 3 , the fourth switch K 4 and the fifth switch K 5 , the first switch K 1 The other end is connected to the first capacitor C 1 One end of the first switch K 1 with the second switch K 2 The connected intersection points are respectively connected to the second capacitor C 2 One end of the sixth diode D 6 the negative pole of the third switch K 3 with the fourth switch K 4 The connected intersection is connected to the second capacitor C 2 the other end of the fourth switch K 4 with the fifth switch K 5 The connected intersection connects the first capacitor C 1 the other end of the fifth switch K 5 The other end of the...

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Abstract

A fault self-clearing MMC (Modular Multi-level Converter) sub module and a converter with the same are provided. The fault self-clearing MMC sub module includes a first switch, a second switch, a third switch, a fourth switch and a fifth switch which are sequentially connected in series. The other end of the first switch is connected with one end of a first capacitor. The connection joint of the first switch and the second switch is connected with one end of a second capacitor and the negative pole of a sixth diode. The connection joint of the third switch and the fourth switch is connected with the other end of the second capacitor. The connection joint of the fourth switch and the fifth switch is connected with the other end of the first capacitor. The other end of the fifth switch is connected with the positive pole of the sixth diode. The connection joint of the second switch and the third switch serves as the positive pole of the fault self-clearing MMC sub module. The connection joint of the fifth switch and the sixth diode serves as the negative pole of the fault self-clearing MMC sub module. The MMC sub module outputs three levels to reduce the rated voltage or number of power electronic devices. Investment is reduced, and the economical efficiency is improved. Fault current self-clearing is realized.

Description

technical field [0001] The invention relates to an MMC submodule. In particular, it relates to a fault self-clearing MMC sub-module and a converter with the sub-module. Background technique [0002] With the advantages of low investment, high stability, and flexible control, the high-voltage direct current transmission system is more reasonable and applicable in long-distance large-capacity transmission projects, and plays a greater role in promoting the development of my country's electric power industry. However, the traditional HVDC transmission system is very easy to affect the power recovery of the system due to commutation failure, and has defects such as poor waveform quality and high cost. With the development of power electronic devices, the voltage source converter with self-commutation capability has fundamentally overcome the above defects, and the DC transmission system (flexible DC transmission system) using this converter has a good development. prospect. ...

Claims

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Application Information

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IPC IPC(8): H02M7/483H02H7/122
CPCH02M7/483H02H7/122
Inventor 孟明苏亚慧吴亚帆
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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