Interphase fault location method for active distribution networks based on time-domain voltage similarity comparison

CHEN Hechong; YANG Fan; SHAO Xiaofei; CONG Wei; LEI Yang; YANG Zhichun; LIANG Shuang

doi:10.19783/j.cnki.pspc.251395

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Interphase fault location method for active distribution networks based on time-domain voltage similarity comparison

更新时间：2026-07-27

- Interphase fault location method for active distribution networks based on time-domain voltage similarity comparison
- Power System Protection and Control Vol. 54, Issue 12, (2026)
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- DOI：10.19783/j.cnki.pspc.251395
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- Published：2026
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CHEN Hechong, YANG Fan, SHAO Xiaofei, et al. Interphase fault location method for active distribution networks based on time-domain voltage similarity comparison[J]. Power System Protection and Control, 2026, 54(12).
DOI：

CHEN Hechong, YANG Fan, SHAO Xiaofei, et al. Interphase fault location method for active distribution networks based on time-domain voltage similarity comparison[J]. Power System Protection and Control, 2026, 54(12). DOI： 10.19783/j.cnki.pspc.251395.

摘要

准确的故障测距是提升有源配电网供电可靠性的关键。分布式电源 (distributed generation

DG) 接入后，配电网故障电气量的分布规律发生变化，导致传统测距方法精度下降，甚至失效。针对这一问题，提出一种基于时域电压波形相似度比较的有源配电网相间故障测距方法。该方法利用故障线路两侧电压、电流的故障分量，在假设故障位置的条件下分别推算故障点时域电压，并通过比较两侧推算故障点时域电压的波形相似程度判断假设位置是否正确。当电压波形相似度不满足判据时，结合二分法迭代修正假设故障位置，逐步逼近真实故障点，实现准确测距。基于 PSCAD 搭建有源配电网仿真模型，并设置多种故障场景进行验证。结果表明，所提方法对 DG 具有较强适应性，测距精度高、收敛速度快，能够有效提高有源配电网相间故障测距精度。

Abstract

Accurate fault location is crucial for improving the power supply reliability of active distribution networks. With the integration of distributed generation (DG)

the distribution characteristics of fault electrical quantities in distribution networks have changed

leading to reduced accuracy or even failure of traditional fault location methods. To address this issue

an interphase fault location method for active distribution networks based on time-domain voltage waveform similarity comparison is proposed. The method utilizes fault components of voltage and current at both ends of the faulted line. Under an assumed fault location

the fault-point voltage in the time domain is calculated from both sides

and the similarity between the reconstructed voltage waveforms is evaluated to determine whether the assumed location is correct. When the waveform similarity does not satisfy the criterion

a bisection method is used to iteratively update the assumed fault position

gradually converging to the actual fault point and achieving accurate fault location. An active distribution network model is built in PSCAD and various fault scenarios are designed for validation. Results show that the proposed method has strong adaptability to DG integration

high location accuracy

fast convergence speed

and effectively improves the accuracy of interphase fault location in active distribution networks.

关键词

Keywords

references

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