A control method and control device for voltage unbalance of UHV DC transmission valve group

A UHV DC and balanced control technology, applied in the direction of electrical components, etc., can solve the problem of not being able to meet the power regulation requirements of two AC grids

Active Publication Date: 2017-05-17
NR ELECTRIC CO LTD +2
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  • Abstract
  • Description
  • 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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  • A control method and control device for voltage unbalance of UHV DC transmission valve group
  • A control method and control device for voltage unbalance of UHV DC transmission valve group
  • A control method and control device for voltage unbalance of UHV DC transmission valve group

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Embodiment Construction

[0019] The two valve groups on the rectification side are respectively equipped with current regulation units, and at the same time, the two valve groups are respectively equipped with voltage correction units, and the output of the two valve groups is used to correct the output of the current regulation unit. The key 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 regulation units, and also select different voltage reference values ​​respectively.

[0020] Each valve group on the rectification side is equipped with a current regulation unit and a voltage correction unit. The current regulating unit controls the corresponding valve group current, and the voltage correction unit controls the corresponding valve group voltage. The valve group mainly controls the trigger angle with the output of the current regulating...

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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 transmission, and in particular relates to a method and a control device for controlling voltage imbalance of an ultra-high voltage direct current transmission valve group. Background technique [0002] UHV DC transmission adopts two valve groups connected in series, and the current flowing through the power semiconductor of each valve group is the same. One of the existing UHVDC valve group adjustment technologies is that the high and low voltage valve groups on the rectification side set a common current regulation unit at the so-called pole level, where the firing angle output by the common current regulation unit is transmitted to each series The high and low pressure valve groups on the inverter side are equipped with a common voltage regulation unit at the so-called pole level, wherein the firing angle output by the common voltage regulation unit is transmitted to each series...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00
Inventor 王永平蒲莹卢东斌张庆武王振曦厉璇张云晓潘卫明卢亚军
Owner NR ELECTRIC CO LTD
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