| 引用本文: | 林浩然,孔维娜,褚福亮,等.T接暂态电流对有源配电网差动保护的影响与解决方法[J].电力系统保护与控制,2026,54(06):83-93. |
| LIN Haoran,KONG Weina,CHU Fuliang,et al.Impact of T-connected transient currents on current differential protection in active distribution networks and its mitigation method[J].Power System Protection and Control,2026,54(06):83-93 |
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| 摘要: |
| 为应对分布式电源接入带来的保护问题，电流差动保护已开始应用于有源配电网。在配电网馈线区段中，常有T接变压器或感应电动机类型的负荷分支，其产生的非故障暂态电流可能导致电流差动保护误动。针对该问题，分析了T接暂态电流可能引起差动保护误动的多个场景。在此基础上，结合暂态电流波形特点，提出了一种基于差动电流正序分量衰减特征的闭锁方案。该方案采用傅里叶算法提取电流基波幅值，通过正序电流幅值衰减率区分故障差流和非故障暂态差流。仿真结果和现场数据验证表明，所提方案能够在不降低差动保护灵敏度的前提下，有效规避T接变压器或感应电机引起的保护误动风险。 |
| 关键词: T接负荷分支 暂态电流 闭锁方案 电流差动保护 有源配电网 |
| DOI：10.19783/j.cnki.pspc.250655 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(52277109) |
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| Impact of T-connected transient currents on current differential protection in active distribution networks and its mitigation method |
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LIN Haoran1, KONG Weina1,CHU Fuliang1,YUAN Tong2,YANG Mingyao1,GAO Houlei2
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1. Jining Power Supply Company, State Grid Shandong Electric Power Company, Jining 272000, China;
2. School of Electrical Engineering, Shandong University, Jinan 250061, China
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| Abstract: |
| To address protection issues arising from distributed generation integration, current differential protection has been increasingly applied in active distribution networks. In distribution feeder sections, T-connected load branches, such as transformers or induction motors, are commonly present. The non-fault transient currents generated by these branches may lead to the maloperation of current differential protection. Focusing on this problem, this paper analyzes multiple scenarios where T-connected transient currents may cause differential protection maloperation. Based on the characteristics of transient current waveforms, a blocking scheme based on the attenuation characteristics of the positive-sequence component of the differential current is proposed. This scheme employs the Fourier algorithm to extract the fundamental current amplitude and distinguishes fault differential currents from non-fault transient differential currents according to the attenuation rate of the positive-sequence current amplitude. Simulation results and field data verification demonstrate that the proposed scheme can effectively avoid the risk of protection maloperation caused by T-connected transformers or induction motors without compromising the sensitivity of current differential protection. |
| Key words: T-connected load branch transient current blocking scheme current differential protection active distribution network |
