输电线路单相自适应重合闸的双SVM实现方案

Implementation of Dual Support Vector Machine Based Adaptive Single-Phase Reclosure of Transmission Line

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。

The focus of implementing adaptive reclosure of transmission line is to distinguish permanent fault from temporary fault and rapidly determine the extinguishing moment of secondary arc caused by the temporary fault. An implementation of adaptive reclosure based on dual support vector machine （SVM） is proposed. Firstly, the frequency spectrum distribution of terminal voltage of the faulty phase during the secondary arc and the different characteristics of high-frequency energy under permanent fault and temporary fault are analyzed, and discrete Fourier transform is used to obtain the total distortion rate of voltage harmonics and the two-dimensional characteristic vector of high-frequency energy, and the first SVM, namely the SVM1, is designed to differentiate fault properties; secondly, based on the varying characteristics of both voltage amplitude and voltage harmonics of the faulty phase before and after the extinction of the secondary arc, the total distortion rate of voitage harmonics and voltage amplitude are taken as the input of the second SVM, namely the SVM2, to judge whether the secondary are is extinguished. Simulation results show that the proposed method can distinguish temporary fault from permanent fault reliably, and catch the moment of arc extinction of temporary fault quickly, besides it possesses strong anti-noise ability.