Research on Asymmetrical Short-circuit Current Parameters Calculation Method Based on Envelope

GUO Shuangquan; CHEN Jiawei; YAN Duifeng; MA Jianjun; WANG Jinxin

doi:10.13296/j.1001-1609.hva.2026.03.025

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Research on Asymmetrical Short-circuit Current Parameters Calculation Method Based on Envelope

Research & Analysis | 更新时间：2026-03-11

- Research on Asymmetrical Short-circuit Current Parameters Calculation Method Based on Envelope
- High Voltage Apparatus Vol. 62, Issue 3, Pages: 212-217(2026)
- 作者机构：
  
  国网新疆电力有限公司电力科学研究院，乌鲁木齐 830011
  西安高压电器研究院股份有限公司，西安 710077
  西安交通大学，西安 710049
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.03.025
  CLC：
- Received：12 August 2025，
  
  Revised：2025-10-12，
  
  Published：16 March 2026
- 稿件说明：
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GUO Shuangquan, CHEN Jiawei, YAN Duifeng, et al. Research on Asymmetrical Short-circuit Current Parameters Calculation Method Based on Envelope[J]. High Voltage Apparatus, 2026, 62(3): 212-217.
DOI：

GUO Shuangquan, CHEN Jiawei, YAN Duifeng, et al. Research on Asymmetrical Short-circuit Current Parameters Calculation Method Based on Envelope[J]. High Voltage Apparatus, 2026, 62(3): 212-217. DOI： 10.13296/j.1001-1609.hva.2026.03.025.

摘要

针对电力系统非对称短路电流参数计算中包络线位置偏移而产生的电流有效值与直流分量误差问题，文中提出一种新的包络线切点修正方法。首先对非对称短路电流波形进行基线校正和小波去噪预处理。其次，通过局部极值点抛物线拟合的方式精确提取电流峰值及时间参数；利用这些峰值集合进行初步包络线拟合，进而计算非对称短路电流直流分量。接着，从原电流波形中剔除直流分量，得到对称分量电流峰值和时间集合，将其作为真实包络线拟合点集合。最后，进一步以修正后的切点集合重构包络线函数，从而优化有效值与直流分量的计算模型。实验比对结果显示：该修正方法显著提高了电流有效值的计算准确度，其相对误差由原方法的0.014%～0.184%降低至0%～0.042%；直流分量的相对误差从0.114%～0.625%降至0.093%～0.481%。这种方法为非对称短路电流参数的高准确度计算提供了有效的解决方案，尤其适用于直流分量时间常数超标的复杂工况。

Abstract

As for the errors in current root-mean-square (RMS) and DC component component due to the positional deviation of the envelope in the calculation of asymterical short-circuit current parameters in power systems

an improved method based on envelope tangent point correction is proposed in this paper. First

the baseline correction and wavelet denoising preprocessing of the asymmetrical short-circuit current waveform are performed.Then

the current peaks and time parameter are accurately extracted through parabolic fitting of local extreme points. With these peaks

an initial envelope fitting is conducted to calculate the DC component of the asymmetrical short-circuit current. After that

the DC component is removed from the original waveform

a symmetrical component current peak and time set is obtained and used as the true envelope tangent points. Finally

the envelope function is reconstructed with the corrected tangent points so to optimize the calculation models for the RMS value and DC component. The experimental comparison result shows that the proposed method has significantly improved the calculation accuracy of current RMS

the relative error is reduced from 0.014%-0.184% (original method) to 0%-0.042%. The relative error of the DC component is decreased from 0.114%-0.625% to 0.093%-0.481%. This method provides an effective solution for high-precision parameter calculation of asymmetrical short-circuit currents in power systems and is especially suitable for complex operating conditions with excessive DC component time constants.

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