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The method of increasing the value of the arc extinguishing angle according to the area value setting when the DC commutation fails

A technology of commutation area and commutation failure, which is applied in the field of high-voltage direct current transmission and high-voltage/ultra-high voltage direct current transmission, can solve problems such as disturbance of direct current transmission, and achieve the effect of avoiding disturbance and continuous commutation failure

Active Publication Date: 2017-10-31
CHINA SOUTHERN POWER GRID COMPANY +1
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AI Technical Summary

Problems solved by technology

At the same time, if a larger and increased arc-extinguishing angle is fixedly selected, when a slight AC grid fault causes commutation failure, due to the control operation of increasing the arc-extinguishing angle and selecting a larger angle, there will be a greater impact on DC transmission disturbance

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  • The method of increasing the value of the arc extinguishing angle according to the area value setting when the DC commutation fails
  • The method of increasing the value of the arc extinguishing angle according to the area value setting when the DC commutation fails
  • The method of increasing the value of the arc extinguishing angle according to the area value setting when the DC commutation fails

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Embodiment Construction

[0029] The DC commutation failure of the present invention sets the method of increasing the value of the arc extinguishing angle according to the value of the area, and the implementation method is:

[0030] Calculate the value of the commutation area of ​​the AC grid voltage. When the commutation fails, according to the value of the commutation area, set the value of the arc extinguishing angle that needs to be increased for the control operation of the arc extinguishing angle.

[0031] The voltage commutation area of ​​the AC grid can be: the area of ​​the arc overlapping area, the area of ​​the arc extinguishing area, or the area of ​​the overlapping arc area + the area of ​​the arc extinguishing area.

[0032] Here, the commutation area value is the voltage integral value (voltage multiplied by time). There are many options for the voltage specific value: 1. According to the actual voltage value (in kilovolts); 2. According to the per unit value (the effective value of th...

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Abstract

The invention discloses a method for setting and increasing the value of the arc extinguishing angle according to the value of the area value for DC transmission commutation failure. In the DC power transmission system, the value of the commutation area of ​​the AC grid voltage is calculated. When a commutation failure occurs, the value of the commutation area is used , to set the value of arc extinguishing angle required to increase the arc extinguishing angle control operation. The voltage commutation area of ​​the AC grid is: the area of ​​the arc overlapping area, the area of ​​the arc extinguishing area, or the area of ​​the arc overlapping area+the area of ​​the arc extinguishing area. There are linear method, limiting linear method, step method, step plus linear method to increase arc extinguishing angle value according to area value setting. According to the different degrees of faults in the AC power grid, different angle values ​​for increasing the arc extinguishing angle are selected; thus, the control operation of increasing the arc extinguishing angle can not only more effectively avoid the continuous commutation failure under the serious fault degree, but also avoid the damage caused by the minor fault degree. DC transmission brings large disturbances.

Description

technical field [0001] The invention relates to a method for setting and increasing the numerical value of the arc-extinguishing angle according to the numerical value of the area in case of DC transmission commutation failure. In particular, it involves high-voltage / ultra-high voltage direct current transmission based on thyristor single-control devices, excluding high-voltage direct current transmission based on full-control devices such as IGBT / IGCT. Background technique [0002] At present, there are many high-voltage direct current transmission projects in operation in China, and most of them are high-voltage direct current transmission projects based on thyristor single-control devices. System structure such as figure 1 shown. It usually consists of a converter station and a DC line; the converter station is usually divided into a rectifier station and an inverter station; each converter station is composed of an AC grid, a converter transformer, a converter, etc.; a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 丁晓兵吴林平刘之尧王俊生余江王永平朱韬析杨建明
Owner CHINA SOUTHERN POWER GRID COMPANY
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