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UHV DC transmission control method and control device based on voltage calculation value

An ultra-high voltage DC and voltage calculation technology, applied in the direction of power transmission and AC network, which can solve the problems of valve block overvoltage protection action blocking and inability to accurately control the valve group voltage.

Active Publication Date: 2020-02-07
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If the UHV DC transmission is not equipped with a voltage measuring point at the midpoint of the double-twelve pulsating DC poles, the valve group voltage cannot be precisely controlled; if the voltage measuring point is configured, the overvoltage protection action of the valve group may be blocked due to the failure of the measuring point

Method used

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  • UHV DC transmission control method and control device based on voltage calculation value
  • UHV DC transmission control method and control device based on voltage calculation value
  • UHV DC transmission control method and control device based on voltage calculation value

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Embodiment Construction

[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] figure 1 It shows the main circuit of a single converter station in a conventional UHVDC transmission system where the high and low-end valve groups are connected to the same AC grid. One DC pole 10 of the conventional UHV DC transmission is connected to the converter station at the other end through the DC line 6 . The DC pole 10 has two high-end valve groups 8 and low-side valve groups 9 composed of valve groups 4 , which can be bridged by DC switches 5 respectively. The low-end valve group 9 is connected to the ground electrode 11 through the ground electrode line 7. The valve group 4 is a twelve-pulse three-phase bridge circuit, that is, it includes two six-pulse bridges 4a and 4b connected in series, which are respectively connected to the high-voltage direct current transmission transformer 3 . The HVDC transformer 3 has a p...

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Abstract

The invention discloses a UHVDC transmission control method and control device based on a calculation voltage value. A midpoint voltage measurement fault is determined according to a 12-12 pulsating DC pole midpoint voltage measurement value or a midpoint voltage measurement point feedback signal, and a valve group voltage calculation value is employed as a feedback voltage for control; a voltage correction unit is configured at a rectification side, difference of the valve group voltage calculation value and a valve group voltage reference value is superposed to difference of a valve group current measurement value of a current adjusting unit and a valve group current reference value, and a trigger delay angle of a valve group is controlled through a PI adjusting device according to the result; a voltage control unit is configured at an inversion side, the trigger delay angle of the valve group is controlled through the PI adjusting device according to the difference of the valve group voltage reference value and the valve group voltage calculation value. The method is advantaged in that stable voltage control on UHVDC can be realized without a 12-12 pulsating DC pole midpoint voltage measurement point or under a voltage measurement point fault. The invention further discloses a UHVDC transmission control device based on the calculation voltage value.

Description

technical field [0001] The invention belongs to the field of ultra-high voltage direct current transmission, and in particular relates to a voltage control method and a control device for an ultra-high voltage direct current transmission valve group. Background technique [0002] UHV DC transmission adopts double twelve pulse valve groups connected in series, and the DC current flowing through each valve group is the same. In order to control the voltage of each valve group, a voltage measuring point is arranged at the midpoint of the double twelve-pulse DC pole, and the measured voltage of each single twelve-pulse valve group can be accurately obtained. The rectifier side is equipped with a voltage correction unit, which superimposes the difference between the measured voltage of the valve group and the reference value of the valve group voltage on the difference between the measured value of the valve group current of the current adjustment unit and the reference value, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 张福轩余军卢东斌郭贤珊刘杰黄志岭侍乔明
Owner STATE GRID CORP OF CHINA
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