可抑制故障电流中谐波分量的新型消弧线圈设计  

Design of New Type of Arc Suppressing Coil Capable of Suppressing Harmonic Components in Fault Currents

作　　者：梁定守 陈坤燚 胡庆威 柯贤旺 LIANG Dingshou;CHEN Kunyi;HU Qingwei;KE Xianwang(College of Intelligent Systems Science and Engineering,Hubei Minzu University,Enshi 445000,China)

机构地区：[1]湖北民族大学智能科学与工程学院,湖北恩施445000

出　　处：《湖北民族大学学报（自然科学版）》2024年第3期375-381,394,共8页Journal of Hubei Minzu University:Natural Science Edition

基　　金：湖北省教育厅科学技术研究计划指导性项目(B2019092)。

摘　　要：针对当前的有源消弧方法因谐波电流检测精度不足而效果较差,以及传统消弧线圈在谐波影响下容易导致消弧失败的问题,设计了一种无须谐波检测便可有效抑制故障点残流中谐波分量的新型消弧线圈。该消弧线圈由逆变器并联传统消弧线圈构成,其中逆变器的指令电压根据中性点电位进行调整,可使逆变器支路不产生基波电流;逆变器的低谐波阻抗特性可有效降低故障点残流中的谐波分量;同时传统消弧线圈过补偿可抵消电容电流。经过Matlab和PSCAD/EMTDC(power systems computer aided design/electromagnetic transients including direct current)仿真,结果显示新型消弧线圈将故障点处的5次谐波、7次谐波分别由25.62、65.85 A降低到了0.11、0.57 A,能够实现可靠消弧。该研究在配电网消弧领域具有一定的应用前景。A new type of arc suppressing coil was proposed to address the poor performance of existing active arc suppression methods due to inadequate harmonic current detection accuracy,as well as the problem of arc suppression failure caused by harmonic effects on traditional arc suppressing coils.This new arc suppressing coil effectively suppressed harmonic components in residual currents at fault points without the need for harmonic detection.The arc suppressing coil consisted of a traditional arc suppressing coil connected in parallel with an inverter.The command voltage of the inverter was adjusted based on the neutral point potential,which ensured that the inverter branch did not generate fundamental current.Additionally,the low harmonic impedance characteristics of the inverter effectively reduced harmonic components in residual currents at fault points.Furthermore,the traditional arc suppressing coil provided overcompensation to counteract capacitive currents.Through Matlab and power systems computer aided design/electromagnetic transients including direct current(PSCAD/EMTDC)simulation,the results showed that the new arc suppressing coil reduced the 5th and 7th harmonic components at the fault point from 25.62 A and 65.85 A,respectively,to 0.11 A and 0.57 A,enabling reliable arc suppression.This research has promising potential applications in the field of arc suppression in distribution networks.

关 键 词：谐波电流 消弧线圈 故障点残流 逆变器 低谐波阻抗 过补偿 

分 类 号：TM771[电气工程—电力系统及自动化]