Method for suppressing overvoltage between current converter bridges and system thereof

A converter bridge and overvoltage technology, which is applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., to achieve the effect of increasing complexity and suppressing the generation of overvoltage between bridges

Active Publication Date: 2015-11-04
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, it is necessary to provide a method and system for suppressing the overvoltage between converter bridges in view of the problem of overvoltage between converter bridges

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  • Method for suppressing overvoltage between current converter bridges and system thereof
  • Method for suppressing overvoltage between current converter bridges and system thereof
  • Method for suppressing overvoltage between current converter bridges and system thereof

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0024] see figure 1 , figure 2 and image 3 Shown is an embodiment of the method for suppressing the overvoltage between converter bridges of the present invention. The method for suppressing the overvoltage between converter bridges in this embodiment includes the following steps:

[0025] Step S101: Measure the current value of the neutral bus of the converter, and decompose to obtain the current amplitude of the 24th harmonic component, and according to the converter transformer of the single 12-pulse valve group in the double 12-pulse valve group and the The tot...

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Abstract

The invention relates to a method for suppressing overvoltage between current converter bridges and a system thereof. A widely applied 12-pulse series-structured current converter structure is arranged in an ultrahigh voltage direct current project. In the unlocking process of the actual project, the trigger angle of a 12-pulse valve group probably has deviation, 24 times of harmonic wave is excited, and resonance is caused in a current converter loop by the 24 times of harmonic wave and relatively high overvoltage is generated between the current converter bridges. The size of overvoltage between the current converter bridges is detected firstly and compared with the set threshold value. If the size of overvoltage is greater than the set threshold value, a direct current filter is enabled to be disconnected before unlocking of the current converters next time, the loop of the 24 harmonic wave in the current converters is cut off and generation of overvoltage between the current converter bridges is suppressed. The method is effective, simple and convenient, normal unlocking is performed by overvoltage is suppressed and degree of complexity of a direct current power transmission system is not increased.

Description

technical field [0001] The invention relates to the field of direct current transmission, in particular to overvoltage control transformation technology. Background technique [0002] In the UHV DC project, there is a 12-pulse series converter structure widely used. In the unlocking process of the actual project, the firing angle of the 12-pulse valve group may deviate, which excites the 24th harmonic, which causes resonance in the converter circuit and generates a high overvoltage between the converter bridges , even if a lightning arrester is used, it may cause damage to the life of the equipment. Contents of the invention [0003] Based on this, it is necessary to provide a method and system for suppressing the overvoltage between the converter bridges for the problem of overvoltage between the converter bridges. [0004] A method for suppressing overvoltage between converter bridges, comprising the following steps: [0005] Measure the current value of the neutral b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02J1/00
Inventor 杨煜赵晓斌徐迪臻
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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