低压直流微电网短路故障早期检测方法研究 米

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中图分类号：TM77 文献标志码：A 文章编号：2095-8188（2025）05-0001-08

DOI： 10.16628/j .cnki.2095-8188.2025.05.001

Abstract：Inorder to further improve the sensitivityand reliabilityof short-circuit fault detection in low voltage DC microgrids，ashort-circuitfault early detectionmethod based onvoltageand currentmulti-scalewavelet transform is proposed.Basedonthe leastsquares front filtering，fullyconsidering thevoltage andcurrent shortcircuit fault singularity，the fourth layer wavelet decompositiondetailcomponentsareused toconstructtheshortcircuit faultearlydetectioncriterion.The experimentalresults showthat the proposed detection method is insensitive to the transitionresistance.Theshort-circuit faultscanbequickly detected within O.5mswhen the transition resistanceissmallTheshort-circuitfaultscanbereliablydetected withinO.6mswhen thetransitionresistance is large.Atthesametime，itcaneffctivelyavoid theinfluenceof disturbing conditionssuchasfrequent load switching，and hasbettersensitivityand reliability.

Key words：low voltage DC microgrid；short-circuit fault；early detection；wavelet transform；least ：quares fitting

0 引言

随着新型电力系统建设的推进，低压直流微电网逐渐成为能源互联网的重要组成部分[1]然而，当直流微电网内发生短路故障时，稳压电容快速放电，短路电流迅速增大，将会对微电网内的电力电子设备造成不可逆的损害[2]。（剩余9437字）