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Control method and device for voltage imbalance of ultrahigh-voltage direct-current power transmission valve groups

An ultra-high voltage DC, balanced control technology, applied in electrical components and other directions, can solve the problem of not being able to meet the power regulation requirements of two AC power grids

Active Publication Date: 2015-04-01
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, because the voltage of each series valve group is symmetrically balanced and the current in series is the same, the power delivered by each series valve group is basically the same, which cannot meet the power regulation requirements of the two AC power grids

Method used

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  • Control method and device for voltage imbalance of ultrahigh-voltage direct-current power transmission valve groups
  • Control method and device for voltage imbalance of ultrahigh-voltage direct-current power transmission valve groups
  • Control method and device for voltage imbalance of ultrahigh-voltage direct-current power transmission valve groups

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Embodiment Construction

[0019] The two valve groups on the rectifier side are respectively equipped with a current adjustment unit, and at the same time, the two valve groups are respectively equipped with a voltage correction unit, and the output of the current adjustment unit is used to correct the output of the current adjustment unit. The main point of the scheme is that the voltage reference values ​​of the voltage correction units of the two valve groups are not equal. ; The two valve groups on the inverter side are respectively equipped with voltage regulating units, and also select different voltage reference values ​​respectively.

[0020] Each valve group on the rectifier side is equipped with a current adjustment unit and a voltage correction unit. The current adjustment unit controls the current of the valve group corresponding to it, and the voltage correction unit controls the voltage of the valve group corresponding to it. The valve group mainly controls the trigger angle based on the ...

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Abstract

The invention discloses a control method and device for the voltage imbalance control of ultrahigh-voltage direct-current power transmission valve groups. The method and the device are used for regulating the valve group voltage of a series circuit consisting of two valve groups of controllable power semiconductors. According to the invention, the two valve groups connected in series and on the rectifying side are respectively equipped with current regulating units, the currents of the valve groups are used as control targets, and the two valve groups are also equipped with voltage correcting units put into use selectively. The voltages of the two valve groups are imbalanced through setting the voltage reference values of the voltage correcting units. The voltages at the two ends of the two valve groups on the inverting side are controlled by voltage regulating units, the voltage reference values of the two valve groups are set to be unequal, and the voltage imbalance running of the two valve groups is realized.

Description

technical field [0001] The invention belongs to the field of ultra-high voltage direct current power transmission, and particularly relates to a voltage unbalance control method and control device of a valve group of ultra high voltage direct current power transmission. Background technique [0002] UHVDC transmission adopts two valve groups in series with each other, and the current flowing through the power semiconductors of each valve group is the same. One of the existing UHV DC transmission valve group adjustment technologies is to set a common current adjustment unit at the so-called pole level for the high and low voltage valve groups on the rectifier side, wherein the firing angle output by the common current adjustment unit is transmitted to each series connection. The high and low pressure valve groups on the inverter side are provided with a common voltage regulating unit at the so-called pole level, wherein the firing angle output by the common voltage regulating...

Claims

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Application Information

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IPC IPC(8): H02J5/00
Inventor 王永平卢东斌张庆武王振曦潘卫明
Owner NR ELECTRIC CO LTD
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