| 引用本文: | 洪聪,张员宁,黄景光,刘琦,林湘宁,李振华.基于形态边缘导向算子的风电场送出线路梯度能量匹配式纵联保护判据[J].电力自动化设备,2025,45(6):88-94,100. |
| HONG Cong,ZHANG Yuanning,HUANG Jingguang,LIU Qi,LIN Xiangning,LI Zhenhua.Gradient-energy-matched pilot protection criteria based on morphological edge-oriented operator for wind farm transmission line[J].Electric Power Automation Equipment,2025,45(6):88-94,100. |
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| 摘要: |
| 风电系统高谐波、频率偏移、弱馈等故障特征，导致传统的送出线路差动保护性能下降。为此，分析风电场电源故障特性，提出一种基于形态边缘导向算子的风电场送出线路梯度能量匹配式纵联保护判据。利用多分辨形态学梯度(MMG)提取两侧电流的边缘信息，并定义梯度能量以凸显电流间的幅值差异。引入动态时间规整(DTW)作为量化标准，深层次比较能量随时间的变化效应。在此基础上，构造梯度能量比自适应地调整制动量大小，以进一步提高保护的可靠性和灵敏性。仿真结果表明，所提判据不受频率偏移和弱馈特性影响，具有较强的耐过渡电阻能力和抗噪性能，较之传统差动保护更具优势。 |
| 关键词: 风电场送出线路 多分辨形态学梯度 动态时间规整 梯度能量 纵联保护 继电保护 |
| DOI：10.16081/j.epae.202412039 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金企业创新发展联合基金资助项目(U22B20106) |
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| Gradient-energy-matched pilot protection criteria based on morphological edge-oriented operator for wind farm transmission line |
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HONG Cong1, ZHANG Yuanning2, HUANG Jingguang1, LIU Qi2, LIN Xiangning3, LI Zhenhua1
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1.Hubei Provincial Engineering Center for Intelligent Energy Technology, China Three Gorges University, Yichang 443002, China;2.Super High Voltage Company of State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430050, China;3.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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| Abstract: |
| Fault characteristics such as high harmonics, frequency offset, and weak feedback in wind power systems lead to a decline of the performance of conventional pilot protection for transmission line. To address this, the fault characteristics of wind farm are analyzed, and a gradient-energy-matched pilot protection criteria based on morphological edge-oriented operator is proposed. The multi-resolution morphological gradient(MMG) is used to extract edge information from the currents on both sides, and the gradient energy is defined to accentuate amplitude difference between the currents. By introducing dynamic time warping(DTW) as a quantitative criterion, the temporal variation effect of energy is deeply compared. Based on this, the gradient energy ratio is used to adaptively adjust the restraint quantity, further enhancing the reliability and sensitivity of the protection. Simulative results demonstrate that the proposed protection is not affected by frequency offset and weak feedback, exhibiting strong tolerance to fault transition resistance and noise, providing advantages over conventional differential protection. |
| Key words: wind farm transmission line MMG DTW gradient energy pilot protection relay protection |
