| 引用本文: | 王朝明,孙志攀,洪 丰,等.新能源并网线路阻抗补偿时域距离保护方法[J].电力系统保护与控制,2026,54(03):89-98.[点击复制] |
| WANG Zhaoming,SUN Zhipan,HONG Feng,et al.Time-domain distance protection method for new energy-integrated lines based on impedance compensation[J].Power System Protection and Control,2026,54(03):89-98[点击复制] |
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| 摘要: |
| 新能源并网线路发生接地故障时，新能源电源故障电流弱馈及强受控特性将导致距离保护性能下降。针对新能源并网线路经过渡电阻接地故障常用工频量距离保护灵敏度不足，常规时域距离保护可靠性低的问题，提出一种适应单相接地故障的基于阻抗补偿原理的时域距离保护方法。首先，通过构建时域等式实时求解故障点等效过渡电阻阻值。然后，建立附加阻抗与等效过渡电阻联系，并据此得到精确的阻抗补偿模型，形成阻抗补偿时域距离保护判据。最后，基于PSCAD/EMTDC仿真实验，验证了所提方案在保证可靠性的前提下，显著提升了距离保护经过渡电阻故障时的灵敏度，可以较好地适用于新能源经交流线路送出的场景。 |
| 关键词: 距离保护 新能源并网 适应性分析 过渡电阻 阻抗补偿 |
| DOI：10.19783/j.cnki.pspc.256125 |
| 投稿时间：2025-04-18修订日期：2025-08-25 |
| 基金项目:国家重点研发计划项目资助(2021YFB2401000) |
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| Time-domain distance protection method for new energy-integrated lines based on impedance compensation |
| WANG Zhaoming,SUN Zhipan,HONG Feng,WU Tonghua,DAI Wei,JIANG Yuan |
| (State Grid Electric Power Research Institute (NARI Group Corporation), Nanjing 211106, China) |
| Abstract: |
| When ground faults occur on new energy-integrated lines, the weak fault current injection and strong controllability of new energy sources can degrade distance protection performance. To address the insufficient sensitivity of conventional power-frequency distance protection during ground faults with transition resistance on new energy-integrated lines and the low reliability of conventional time-domain distance protection, this paper proposes a time-domain distance protection method based on impedance compensation for single-phase-to-ground faults. First, the equivalent transition resistance at the fault point is solved in real time by establishing time-domain equations. Then, the relationship between the additional impedance and the equivalent transition resistance is established to derive an accurate impedance compensation model, forming the impedance-compensated time-domain distance protection criterion. Finally, PSCAD/EMTDC simulations verify that the proposed scheme significantly enhances the sensitivity of distance protection during transition resistance faults while ensuring reliability, demonstrating practical applicability for new energy integration via AC lines. |
| Key words: distance protection new energy integration adaptability analysis transition resistance impedance compensation |
