Design of New Type of Arc Suppressing Coil Capable of Suppressing Harmonic Components in Fault Currents
LIANG Dingshou
CHEN Kunyi
HU Qingwei
KE Xianwang
Abstract：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.
Keywords：harmonic currentarc suppressing coilfault point residual currentinverterlow harmonic impedanceovercompensation
Publication Date：2024-09-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 375-381,394 )