| 基于故障暂态低频分量积聚值的新能源送出线路保护方案研究 |
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| 引用本文：叶远波1,王吉文1,汪胜和1,郑涛2,苏毅2,李彪2.基于故障暂态低频分量积聚值的新能源送出线路保护方案研究[J].电网与清洁能源,2023,39(10):113~121 |
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| 基金项目:国家重点研发计划（2021YFB2401004）； 国网安徽省电力有限公司科技项目（521200220009） |
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| 中文摘要:高比例新能源接入使得传统工频量保护难以适用，而行波保护是目前解决新型电力系统可靠性问题的有效途径之一。现有电流行波极性比较式保护方案依赖于首波头的准确捕捉。对此，首先分析了区内外故障时行波的折反射过程，明确了初始行波与后续折反射波间的极性和幅值关系，并定性分析了区内外故障时电流波形的变化趋势。在此基础上，利用故障暂态电流低频分量积聚值表征初始行波极性特征，进而提出了一种新型行波极性比较式纵联保护方案，可以有效解决高阻或小故障初相角情况下传统保护方案可靠性不足问题。最后，大量的PSCAD/EMTDC仿真实验表明，新方案能够可靠识别区内外故障，且具有较好的耐过渡电阻以及抗噪声干扰的能力。 |
| 中文关键词:行波保护 折反射系数 极性特征 积聚值 纵联保护 |
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| Research on the Protection Scheme of the Renewable Energy Output Transmission Line Protection Scheme Based on the Accumulation Value of Fault Transient Low-Frequency Components |
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| Abstract:The traditional power frequency protection fails to function properly with the high proportion of renewable energy access to the power grid， and the traveling wave protection is currently one of the most effective ways to solve the reliability problem of new power systems. The existing current traveling wave polarity comparison protection schemes rely on accurate capture of the first wave head， but in the event of high resistance faults， insufficient reliability occurs. To this end， the article first analyzes the refraction and reflection process of the traveling wave， clarifying the polarity and amplitude relationship between the initial traveling wave and subsequent refraction and reflection waves， and qualitatively analyzes the waveform change trend of the fault current during faults inside and outside the zone. On this basis， the article uses the accumulated values of low-frequency components of fault transient current to characterize the initial traveling wave polarity characteristics， and then proposes a protection scheme based on the polarity characteristics of fault transient components. Finally， a large number of PSCAD /EMTDC simulation experiments have shown that the new scheme can reliably identify faults inside and outside the zone， and has good resistance to transition resistance and noise interference. |
| keywords:traveling wave protection refraction and reflection coefficient polarity characteristics accumulated value pilot protection |
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