| 基于固有频率的超高压线路选相新方法 |
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| 引用本文： | 王兴国,黄少锋.基于固有频率的超高压线路选相新方法[J].高电压技术,2009(6):1502-1508. |
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| 作者姓名： | 王兴国 黄少锋 |
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| 作者单位： | 1. 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,北京,102206
2. 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,北京,102206;北京四方继保自动化股份有限公司,北京,100085 |
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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,分析了影响固有频率的各种因素,提出了一种基于固有频率的超高压输电线路故障选相新方法。该方法采集输电线路单侧故障后电流,通过模量变换获取模分量,利用多信号分类(MUSIC)算法求取模电流频谱,利用频谱特征进行故障类型识别,确定故障相。理论分析表明,故障后的各种频率信号中,除了工频信号以外,固有频率信号是明确的,且信号较强,便于采集。与传统选相方法相比,该方案可以准确、快速地识别故障类型,确定故障相别,且不受系统振荡、负荷电流、故障时刻和系统运行方式的影响,受TA饱和的影响较小。仿真分析验证了该方法的灵敏性和可靠性。
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| 关 键 词： | 电力系统 继电保护 固有频率 频谱分析 故障选相 故障类型 多信号分类算法 |
New Method of Phase Selection of EHV Lines Based on Natural Frequency |
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| WANG Xing-guo
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HUANG Shao-feng.New Method of Phase Selection of EHV Lines Based on Natural Frequency[J].High Voltage Engineering,2009(6):1502-1508. |
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| Authors: | WANG Xing-guo HUANG Shao-feng |
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| Affiliation: | 1.Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education;North China Electric Power University;Beijing 102206;China;2.Beijing Sifang Automation Co.;Ltd;Beijing 100085;China |
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| Abstract: | The periodic current and voltage in transient component are caused by electromagnetic wave flowing through the transmission line and reflecting between fault location and source impendence.In frequency domain the current spectrum is a series of harmonic of a frequency called nature frequency.The nature frequency is related with the length from fault location to source.A protection scheme based on nature frequencies is proposed in this paper,various impact factors of nature frequencies also are discussed.The... |
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