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Arc suppression coil control method and system

A technology of arc suppression coil and control method, which is applied in the field of power system, can solve problems such as slow response speed, and achieve the effect of improving arc suppression efficiency

Active Publication Date: 2017-02-01
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide an arc suppression coil control method and system for the problem of slow response speed

Method used

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  • Arc suppression coil control method and system
  • Arc suppression coil control method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Among them, the sampling frequency is set to 128 points per cycle sampling, and the limit value upper limit U0 upLin = Uq is set to 25V, U0 Max Set to 141.4V (upper limit), then U0 up It is calculated to be 993V.

[0036] like figure 2 As shown, when the grounding occurs at the 29th sampling point, and the effective value of U0 at the grounding moment is 100V, the accumulation starts from the 29th sampling point, and at the 36th point, the accumulated sum U0 Sum is 1123.7, U0 Sum greater than U0 up , it is judged as a ground fault, and the judgment time is 20 / 128*(36-29)=1.09375ms, which is about 1.1ms.

Embodiment 2

[0038] Among them, the sampling frequency is set to 6400, that is, each cycle samples 128 points, and the limit value upper limit U0 upLin = Uq is set to 25V, U0 Max Set to 35.4V (lower limit), then U0 up It is calculated to be 993V.

[0039] like image 3 As shown, when the grounding occurs at the 48th sampling point, and the effective value of U0 at the grounding moment is 25V, the judgment starts from the 48th sampling point, because the absolute value of the sampling points from 48 points to 80 points is less than U0 upLin And the continuous time is equal to 5ms, the absolute value of the sampling point from 48 points to 80 points does not participate in the accumulation, so it starts to accumulate from 80 points, and when it reaches the 112th point, the accumulated sum U0 Sum 993.24V, U0 Sum greater than U0 up , it is judged as a ground fault, and the judgment time is 20 / 128*(112-48)=10ms.

Embodiment 3

[0041] Among them, the sampling frequency is set to 6400, that is, each cycle samples 128 points, and the limit value upper limit U0 upLin = Uq is set to 25V, U0 Max Set to 35.4V (lower limit), then U0 up It is calculated to be 993V.

[0042] like Figure 4 As shown, when the grounding occurs at the 32nd sampling point, and the effective value of U0 at the grounding moment is 25V, the judgment starts from the 32nd sampling point, because the absolute value of the sampling points from 32 o’clock to 48 o’clock is greater than U0 upLin , start accumulating from 32 o'clock, when reaching the 48th o'clock, the accumulative sum U0 Sum is 496.62V, because the absolute value of the sampling points from 48 points to 80 points is less than U0 upLinAnd the continuous time is equal to 5ms, the absolute value of the sampling points from 48 points to 80 points does not participate in the accumulation, because the absolute value of the sampling points from 80 points to the 96th point is ...

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Abstract

The invention relates to an arc suppression coil control method and system. The method comprises the following steps of sampling a neutral point voltage of an arc suppression coil with a certain frequency to acquire the neutral point voltage; judging that a grounding fault occurs if the neutral point voltage conforms to a preset numerical value constraint condition and the duration of conforming to the preset numerical value constraint condition reaches a preset time threshold value, wherein the preset numerical value constraint condition is set according to the maximum value of a grounding starting voltage and the neutral point voltage; and outputting a control signal to a silicon controlled control circuit to start the arc suppression coil for compensation when the grounding fault occurs.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to an arc suppression coil control method and system. Background technique [0002] With the development of the city, the capacity of the power grid increases, and the large-scale use of cables in the distribution network increases the system capacitive current sharply. In this case, when a single-phase ground fault occurs, the arc formed by the ground capacitive current at the fault point cannot be extinguished by itself. The overvoltage generated by the arc will often expand the accident, significantly reduce the reliability of the power system operation, and pose a hidden danger to the safe operation of the power grid. [0003] At present, in my country's medium and low voltage distribution network systems, the neutral point is often grounded through the arc suppression coil. The capacity of the arc suppression coil should be able to change smoothly, and automatically track...

Claims

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Application Information

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IPC IPC(8): H02H9/08
CPCH02H9/08
Inventor 简淦杨李恒真占恺峤陈道品雷金勇詹清华郭晓斌黄松波李鹏谭勤学曾伟忠王惠蔷张振江吴洪伟
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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