IF furnace and other equipment work generate a lot of harmonic current, if not, then it will seriously affect governance grid and the grid in the safe operation of sensitive loads, conventional reactive power compensation device (capacitor banks) can not resist and eliminate interference due harmonics, can not properly put into operation, the power wasted. Our production harmonic frequency furnace control device can effectively solve these problems, both harmonic and can control reactive power compensation, harmonic elimination characteristics such as: 5th, 7th, 11th, 13th and second-class filtering effect is obvious (average harmonic current cancellation rate of up to 70-80%), could solve the harmonic pollution and improve power factor, reduce line and transformer losses, improve the life of the transformer, smelting time can be shortened by about 10%, the economic benefit.