低壓直流微電網(wǎng)短路故障早期檢測(cè)方法研究 米

打開(kāi)文本圖片集

中圖分類(lèi)號(hào)：TM77 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：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

隨著新型電力系統(tǒng)建設(shè)的推進(jìn)，低壓直流微電網(wǎng)逐漸成為能源互聯(lián)網(wǎng)的重要組成部分[1]然而，當(dāng)直流微電網(wǎng)內(nèi)發(fā)生短路故障時(shí)，穩(wěn)壓電容快速放電，短路電流迅速增大，將會(huì)對(duì)微電網(wǎng)內(nèi)的電力電子設(shè)備造成不可逆的損害[2]。（剩余9437字）