The intermittent failure problem is occurred in the line of a steel mill and it is founded through analysis that the voltage distortion of the bus of mill branch leads to improper operation of the rectifier

resulting in the failure of the mill operation. The harmonic source is from the load of the electric arc furnace connectingtothesame 35 kVbus.Theboth

under normal case

are connected independently from the busbar. The harmonic problem for the branch is only considered in the operation of the rolling mill. However

with the access of the nonlinear load arc furnace

strong background harmonics appear on the busbar. The bus voltage is distorted

which affects seriously the normal operation and harmonic control of the rolling mill branch. In this paper

the model with load of electric arc furnace is set up in the Matlab environment by way of analyzing power quality control of steel mill with strong background harmonics

the load feature of the electric arc furnace and the influence of electric arc furnace load on the harmonic control is described qualitatively.Thesimulationresultofthemodeliscomparedandanalyzedandtheconclusionisdrawn.