基于模式电压内积的单相自适应重合闸策略  

Mode Voltage Inner-product-based Single-phase Adaptive Reclosure Strategy

作　　者：马俊清 王檬[1] 刘健 王正阳 MA Junqing;WANG Meng;LIU Jian;WANG Zhengyang(State Grid Tianjin Electric Power Company Training Center,Tianjin 300181,China)

机构地区：[1]国网天津市电力公司培训中心,天津300181

出　　处：《电工技术》2024年第20期105-109,共5页Electric Engineering

摘　　要：针对不带并联电抗器的高压输电线路,提出了一种基于模电压内积的单相自适应重合闸实现方法。首先,采用Clark相模变换矩阵将电压相量转换为模量去除相间的耦合关系,再对瞬时性故障下故障相电压模量幅值进行分析,分别求出故障相电压α模分量内积和0模分量内积,得出两模分量内积比。输电线路发生单相接地故障后,不同故障类型下的故障相和健全相电压有差异,分析发现不同故障下模分量内积比值同样有差异,通过观察内积比值曲线来区分永久性故障与瞬时性故障并确定二次电弧的熄弧时刻。该方法实现简单,能够快速识别故障性质以及二次电弧是否灭弧,计算量低,受线路条件影响小,同时适用于对称和不对称的输电线路。EMTP仿真结果证明了该方法的准确性和可靠性。For high-voltage transmission lines shunt-free reactors,a single-phase adaptive reclosure method based on inner-product of mode voltage is proposed.First Clark phase-mode transformation matrix is used to convert voltage phasor into modulus to remove the coupling relationship between phases.Then the amplitude of fault phase voltage modulus under transient fault is analyzed,and the inner-products ofα-mode component and 0-mode component of fault phase voltage are obtained respectively,and the inner-product ratio of the two mode components is obtained.After a single-phase-to-ground fault occurs in a transmission line,the voltages of fault phase and sound phase are different under different fault types,and the inner-product ratio of mode components is also different under different faults.By observing the internal product ratio curve,the permanent fault and transient fault are differentiated and the quenching time of secondary arc is determined.The method is simple to realize and can quickly identify the fault nature and whether the secondary arc is extinguished.The calculation consumption is low and the influence of line conditions is small.It is also suitable for symmetric and asymmetric transmission lines.EMTP simulation results have verified the accuracy and reliability of the proposed method.

关 键 词：不带并联电抗器 单相自适应重合闸 模电压 故障性质 熄弧时刻 EMTP仿真 

分 类 号：TM723[电气工程—电力系统及自动化]