Researchon DC BiasDue toMagnetic Storm

corresponding suggestions. Abstract--This paperfocuses ontheresearch ontheDC bias duetomagnetic stormandHVDC.Inthepaper, we introduce theDC biasproblemofJiangsu Yang-Huai transmit electric system andSouthern PowerGrids, discuss theharmful effect of thetransformer DC biasandthesignificance ofresearch, and analyzethecompensation, weakening and elimination of transformer biascurrent. Finally, theproblems thatshould be paidattention toand somecorresponding suggestions are proposed.