MMC power module adopting double-bypass switches and overvoltage three-bypass method

A bypass switch and power module technology, applied in the electric power field, can solve the problems affecting the normal operation of the converter valve, the trip of the converter valve, and the refusal of the bypass switch, so as to improve the reliability of the system, shorten the logic link, improve the The effect of reliability

Pending Publication Date: 2020-01-31
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when there is a problem in any link, such as a failure of optical fiber communication, a failure of the main control board, or a failure of the energy harvesting power supply, it will cause the bypass switch to refuse to operate when the power module fails, and finally cause the trip of the converter valve, affecting the operation of the converter valve. normal operation

Method used

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  • MMC power module adopting double-bypass switches and overvoltage three-bypass method
  • MMC power module adopting double-bypass switches and overvoltage three-bypass method
  • MMC power module adopting double-bypass switches and overvoltage three-bypass method

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Embodiment

[0035] refer to Figure 1-2 As shown, the MMC power module using double bypass switches provided in this embodiment includes a first bypass switch K1 and a second bypass switch K2.

[0036] Wherein, the first bypass switch K1 is connected to both ends of the MMC power module in parallel; when the voltage of the capacitor C of the MMC power module exceeds the set safety value, the first bypass switch K1 is closed, so that the MMC power module is bypassed ; When the first bypass switch K1 refuses to operate when the MMC power module fails, the second bypass switch receives a closing command, and the second bypass switch is closed to bypass the MMC power module.

[0037] It can be seen that by setting two bypass switches, the reliability of the power module bypass is improved, and the DC system outage caused by the unreliable bypass of the power module is avoided.

[0038] Optionally, as in image 3 As shown, the above-mentioned MMC power module using double bypass switches als...

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Abstract

The invention discloses an MMC power module adopting double-bypass switches and an overvoltage three-bypass method. The MMC power module adopting the double-bypass switch comprises a first bypass switch and a second bypass switch, wherein the first bypass switch is connected with two ends of the MMC power module in parallel, when a capacitor voltage of the MMC power module exceeds a set safety value, the first bypass switch is closed, so the MMC power module is bypassed, when the MMC power module fails and refuses to operate, the second bypass switch receives a closing instruction, the secondbypass switch is closed, so the MMC power module is bypassed. The MMC power module is advantaged in that by arranging the two bypass switches, reliability of bypass of the power module is improved, and shutdown of a flexible direct current system caused by unreliable bypass of the power module is avoided.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an MMC power module adopting double bypass switches and an overvoltage triple bypass method. Background technique [0002] With the development of high-power flexible DC transmission technology, Modular Multilevel Converter (MMC) is more and more applied to engineering, which has the advantages of low switching frequency, low loss and flexible control. Each bridge arm of this type of converter valve has hundreds of power modules connected in series. Each power module can adopt a full-bridge or half-bridge structure. When the power supply or control board fails, the power module becomes uncontrollable. state, the running capacitor will be continuously charged. When the voltage across the capacitor is too high, it will cause the breakdown of the IGBT power devices connected in parallel at both ends of the capacitor. Since the IGBT used in the current project is in an open s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32H02M1/325
Inventor 刘坤唐金昆梁宁邹延生
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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