Device for preventing sub-module capacitor overvoltage

A sub-module and overvoltage technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve problems such as overvoltage of converter valve submodules, Achieve the effect of simple structure, convenient installation and high economy

Inactive Publication Date: 2015-03-25
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some solutions in the prior art only elaborate on the protection methods of lightning overvoltage and operating overvoltage and the configuration strategy of lightning arresters, but fail to solve the problem of overvoltage of the converter valve sub-module

Method used

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  • Device for preventing sub-module capacitor overvoltage
  • Device for preventing sub-module capacitor overvoltage
  • Device for preventing sub-module capacitor overvoltage

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Embodiment Construction

[0031] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The invention provides a device for preventing overvoltage of a sub-module capacitor during the blockage of a converter valve, which comprises at least one thyristor and a resistor, and the thyristor and the resistor are connected in series. The device is installed between the DC bus and the ground or between the AC bus and the ground of the converter station.

[0033] figure 1 Shown is a schematic structural diagram of a sub-module overvoltage prevention device for a single thyristor, including a first parallel terminal 1 for connecting the bus bar of the flexible direct current transmission system and one end of the device, and a second parallel terminal 2 for connecting the device The other end and the earth. The cathode of the thyristor 4 is connected in series with the resistor 5 at 2. During normal o...

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Abstract

The invention discloses a device for preventing sub-module capacitor overvoltage. The device is applied to a flexible direct current transmission system composed of modularized multi-level converters. The device is formed by connecting at least one thyristor with at least one resistor in series, connected between an alternating current side bus of a converter valve and the ground in parallel, or between a direct current side bus and the ground, or installed in the two positions at the same time. The thyristors are triggered to be switched on, and the residual voltage on the alternating current side or the direct current side is prevented from sub-module capacitor overvoltage in the sub-module capacitor uncontrolled charging process. The installation number and the installation position of the devices can be determined according to engineering requirements, and which devices are determined to be triggered so as to be switched on according to different sub-module overvoltage prevention policies.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, in particular to a device for preventing overvoltage of sub-module capacitors. Background technique [0002] Flexible DC transmission uses voltage source converters, which can independently and quickly control active power and reactive power, thereby improving system stability, suppressing system frequency and voltage fluctuations, and improving the steady-state performance of grid-connected AC systems. The modular multilevel converter does not require direct series connection of switching devices, and can obtain excellent harmonic performance and loss performance through multilevel technology. It is a voltage source converter with the most application potential in the field of flexible direct current transmission Topology. [0003] In order to reduce the probability of failure of DC lines, the transmission lines of existing flexible DC transmission projects generally use subm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32H02M1/322H02H9/04H02M7/217
Inventor 董云龙田杰胡仙来冯亚东卢宇刘海彬曹冬明李海英
Owner NR ELECTRIC CO LTD
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