Researh on Interference Suppression Method for Circulation Current in the Grouding Loop of High-voltage Cables Based on SOGI-PLL

ZHAO Weili; LIN Qingjie; CHEN Tengbiao; LEI Da; LEI Song; LI Dong; TANG Zhiguo

doi:10.13296/j.1001-1609.hva.2026.03.019

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Researh on Interference Suppression Method for Circulation Current in the Grouding Loop of High-voltage Cables Based on SOGI-PLL

Research & Analysis | 更新时间：2026-03-11

- Researh on Interference Suppression Method for Circulation Current in the Grouding Loop of High-voltage Cables Based on SOGI-PLL
- High Voltage Apparatus Vol. 62, Issue 3, Pages: 153-162(2026)
- 作者机构：
  
  深圳供电局有限公司，广东深圳 518000
  华北电力大学高电压与电磁兼容北京市重点实验室，北京 102206
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.03.019
  CLC：
- Received：23 July 2025，
  
  Revised：2025-09-28，
  
  Published：16 March 2026
- 稿件说明：
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ZHAO Weili, LIN Qingjie, CHEN Tengbiao, et al. Researh on Interference Suppression Method for Circulation Current in the Grouding Loop of High-voltage Cables Based on SOGI-PLL[J]. High Voltage Apparatus, 2026, 62(3): 153-162.
DOI：

ZHAO Weili, LIN Qingjie, CHEN Tengbiao, et al. Researh on Interference Suppression Method for Circulation Current in the Grouding Loop of High-voltage Cables Based on SOGI-PLL[J]. High Voltage Apparatus, 2026, 62(3): 153-162. DOI： 10.13296/j.1001-1609.hva.2026.03.019.

摘要

回路电阻带电检测是高压电缆金属护层接地回路电气连接状态检测的一种新技术，该技术通过磁场耦合方式向高压电缆接地回路中注入异频激励，通过测量回路中的异频激励电压与电流响应信号的幅值与相位求解回路电阻，可有效发现回路中的进水受潮、螺栓松动、护层开裂等缺陷。电缆护层中工频环流的存在会对异频信号的注入产生影响，导致激励电源及耦合线圈工作异常，并且对异频信号的检测造成严重干扰，能否有效地抑制工频环流干扰是高压电缆接地回路电阻高精度检测的关键所在。为此，文中提出了一种基于二阶广义积分器锁相（second-order generalized integration-phased lock loop，SOGI-PLL）跟踪原理的工频环流干扰主动抑制技术，通过跟踪护层工频环流干扰信号，动态地控制激励源输出同频反相的信号以抵消其干扰，仿真与试验相结合验证了该方法的有效性。研究结果表明，文中提出的方法能有效消除运行环流干扰对回路电阻带电检测造成的影响，避免耦合线圈磁饱和，大幅提升了耦合注入效率与参数检测精度，在干扰电流为54.9 A的情况下跟踪精度达到了98%，实现了强工频环流干扰情况下回路电阻高精度测量，测量误差小于1%。

Abstract

Live detection of loop resistance is a new technology for detecting the electrical connection status of the grounding loop in the metal sheath of high-voltage cables.This technology injects a variable-frequency excitation current into the high-voltage cable grounding loop through magnetic field coupling and calculates the loop resistanc by measuring the amplitude nd phase of the voltae and current response signals of the excitation. It can effectively identify defects such as moisture ingress

loose bolts and sheath cracks in the loop. The presence of power frequency loop current in the cable sheath can result in influence on the injection of heterogenous frequency signal

leanding to not only abnormal operation of excitation power supply and coupling coils

but also serious interference to the detection of the heterogeneous frequency. Whether the power frequency loop current interference can be effectively mitigated is the key to attaining high-precision detection of the grounding circuit resistance of high-voltage cables. Therefore

in this paper an active suppression technique based on the tracking principle of second-order generalized integration-phased lock loop (SOGI-PLL) is proposed. The excitation source is dynamically controlled to output signals of the same frequency and opposite phase to nullify its interference through tracking power frequency loop current interference signal of the sheat. The effectiveness of the method is verified through the combination of simulation and test. The research result shows that the method proposed in this paper can effectively eliminate the influence of the interference of the operating loop current on the live detection of circuit resistance

avoid the magnetic saturation of the coupling coil and significantly enhance the coupling injection efficiency and parameter detection accuracy of the coupling. The tracking accuracy is up to 98% when the interference current is 54.9 A. The circuit resistance can be precisely measured under intense power frequencyloop current interference and the measurement error is less than 1%.

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