输电线路单相自适应重合闸的双SVM实现方案

发布时间：2018-03-13 21:41

本文选题：自适应重合闸　切入点：支持向量机　出处：《电网技术》2014年10期 　论文类型：期刊论文

【摘要】：实现输电线路自适应重合闸的关键是正确区分永久性故障和瞬时性故障以及快速确定瞬时性故障二次电弧熄灭时刻。提出了基于双支持向量机的自适应重合闸实现方案。首先,分析二次电弧阶段的故障相端电压的频谱分布和高频能量在瞬时性故障和永久性故障下的不同特征,利用离散傅里叶变换获得电压谐波总畸变率和高频能量二维特征向量,设计支持向量机SVM1区分故障性质。其次,基于瞬时性故障二次电弧熄灭前后故障相电压谐波和电压幅值的变化特性,以电压谐波总畸变率和幅值为输入量,利用支持向量机SVM2判断二次电弧是否熄灭。仿真结果表明,所提方法能可靠区分瞬时性故障与永久性故障,快速捕捉瞬时性故障熄弧时刻,抗噪声能力较强。
[Abstract]:The key to realize adaptive reclosure of transmission line is to distinguish between permanent fault and transient fault correctly and to quickly determine the secondary arc extinguishing time of transient fault. An adaptive reclosure implementation scheme based on dual support vector machine is proposed. The spectrum distribution of the terminal voltage of the fault phase and the different characteristics of the high frequency energy in transient and permanent faults are analyzed. The total harmonic distortion rate of voltage and the two-dimensional eigenvector of high frequency energy are obtained by using discrete Fourier transform (DFT). A support vector machine (SVM1) is designed to distinguish fault properties. Secondly, based on the variation characteristics of voltage harmonics and voltage amplitudes before and after transient fault secondary arc extinguishment, the total distortion rate and amplitude of voltage harmonics are taken as input. Support vector machine (SVM2) is used to judge whether the secondary arc is extinguished or not. The simulation results show that the proposed method can reliably distinguish the transient fault from the permanent fault, and can quickly capture the extinguishing time of the transient fault and has a strong anti-noise capability.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家863高技术基金项目(2012AA050215) 国家电网公司研究项目(5216A313500N)~~
【分类号】：TM762.26

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