| 一种基于固有频率的长距离输电线路保护方案 |
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| 引用本文： | 黄少锋,王兴国,刘千宽.一种基于固有频率的长距离输电线路保护方案[J].电力系统自动化,2008,32(8):59-63. |
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| 作者姓名： | 黄少锋 王兴国 刘千宽 |
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| 作者单位： | 华北电力大学电力系统保护与动态安全监控教育部重点实验室,北京市,102206 |
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| 摘 要： | 故障后由于分布电容引起的高频分量在频域表现为固有频率主频的谐波形式.文中讨论了影响固有频率的各种因素,提出了一种基于固有频率的线路保护方案.首先对故障后的电流频谱进行分析,确定固有频率,然后计算固有频率下的阻抗,通过2种判据确定区内、区外故障.该方案不受故障时刻和故障位置的影响,大量的ATP仿真和MATLAB分析验证了该方案的可行性.
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| 关 键 词： | 线路保护 固有频率 频谱分析 阻抗 |
| 收稿时间： | 2007/10/16 0:00:00 |
| 修稿时间： | 2007年10月16 |
Natural Frequency Based Protection Scheme for Long Distance Transmission Line |
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| HUANG Shaofeng,WANG Xingguo,LIU Qiankuan.Natural Frequency Based Protection Scheme for Long Distance Transmission Line[J].Automation of Electric Power Systems,2008,32(8):59-63. |
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| Authors: | HUANG Shaofeng WANG Xingguo LIU Qiankuan |
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| Abstract: | The post-fault high frequency currents caused by distribution capacitances are mainly observed as harmonics in the frequency domain for a transmission line.The paper discusses various influencing factors and proposes a natural frequency based protection scheme.The post-fault current spectrum is first analysed to find out natural frequency.And then the impedance based on the natural frequency is calculated and internal and external zone faults are distinguished via two criteria.The method is immune to the fault location and time.The method is validated by ATP and MATLAB simulation. |
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| Keywords: | line protection nature frequency spectra analysis impedance |
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