Calculation of DC Component Characteristic Parameters of Power System Short-circuit Current Based on Integral and Difference Method

WANG Meng; ZHANG Wenchao; GAO Xiangxiang; CAO Shengshun; WANG Ying

doi:10.13296/j.1001-1609.hva.2018.12.041

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Calculation of DC Component Characteristic Parameters of Power System Short-circuit Current Based on Integral and Difference Method

更新时间：2025-04-26

- Calculation of DC Component Characteristic Parameters of Power System Short-circuit Current Based on Integral and Difference Method
- High VoltageApparatus Vol. 54, Issue 12, Pages: 268-273+280(2018)
- 作者机构：
  
  1. 国家电网公司西北分部
  2. 北京科东电力控制系统有限公司
  3. 西安高压电器研究院有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.12.041
  CLC： TM744
- Published：2018
- 稿件说明：
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[1]王蒙,张文朝,高享想,曹生顺,汪莹.基于积分法和差分法的电力系统短路电流直流分量特征参数计算[J].高压电器,2018,54(12):268-273+280.

WANG Meng, ZHANG Wenchao, GAO Xiangxiang, et al. Calculation of DC Component Characteristic Parameters of Power System Short-circuit Current Based on Integral and Difference Method[J]. High voltageapparatus, 2018, 54(12): 268-273+280.
[1]王蒙,张文朝,高享想,曹生顺,汪莹.基于积分法和差分法的电力系统短路电流直流分量特征参数计算[J].高压电器,2018,54(12):268-273+280. DOI： 10.13296/j.1001-1609.hva.2018.12.041.

WANG Meng, ZHANG Wenchao, GAO Xiangxiang, et al. Calculation of DC Component Characteristic Parameters of Power System Short-circuit Current Based on Integral and Difference Method[J]. High voltageapparatus, 2018, 54(12): 268-273+280. DOI： 10.13296/j.1001-1609.hva.2018.12.041.

摘要

近些年随着电网中直流时间常数的增大

导致短路电流中直流分量衰减速度很慢

超出高压交流断路器在设定时间内开断短路故障的能力。因此

直流时间常数的计算与评估对电网的优化设计和安全运行尤为重要。文中通过构造函数提出了积分法、差分法、组合法3种计算短路电流中直流分量特征参数（初始值I0和时间常数τ）的方法

并应用积分法、差分法、组合法分别对含有三次、五次谐波的3种典型的短路电流波形进行直流分量特征参数计算。研究结果表明:积分法、差分法、组合法对理想的短路电流波形均能够零误差的计算直流分量的初始值和时间常数;叠加高斯白噪声信号后

3种算法的计算精度依次为积分法、组合法、差分法

且3种计算方法对叠加信噪比60 dB高斯白噪声信号的计算结果要优于叠加信噪比30 dB高斯白噪声信号。最后

应用积分法对电网实测的短路电流直流分量进行了计算

该方法为电网短路电流直流分量特征参数随时间变化时的参数计算提供了一种新的解决方法。

Abstract

In recent years

with the increase of DC time constant of power grid

which leads to DC component of short circuit decayed low and exceeded the interruption capability of circuit-breakers in the set time.Therefore

the calculation and evaluation of DC time constant is especially important for the optimal design and safe operation of power grid.In this paper

the integral method

difference method and combination method for calculating the characteristic parameters of DC component of short circuit current with three times and five times harmonic have been proposed.The results show that integral method

difference method and combination method can calculate the characteristic parameters of DC component with zero error for ideal short circuit current waveform.After superposing Gauss white noise signal the calculation precision of three algorithms is integral method

combination method and difference method in turn.What’s more

add the 60 dB Gaussian white noise calculation result is better than 30 dB Gaussian white noise.Furthermore

the DC component of short-circuit current measured in power system is calculated by integrating method

it is provided a new solution to calculated the characteristic parameters of DC component when varying to time.

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