Electric Arc Furnace (EAF) used in metallurgy industry often causes unbalancedthree-phaseload power, and therefore generates severs flicker to the grid, which seriously impact the power quality.
在冶金工业中使用的电弧炉可引起电网三相负荷不平衡，产生谐波引起电流闪变，严重影响电网电能质量。
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The PWM control strategy with 3-th harmonic in addition is presented for four-leg three-phase inverter, the inverter can deal with unbalancedload and has a high utilization of dc bus voltage.