Steel and aluminum smelting are energy intensive processes. Smelting is carried out with disturbing loads, mostly Electric Arc Furnaces (EAFs). Electric Arc and other types of furnaces frequently cause power quality problems, including voltage variations, flicker, poor power factor and harmonic distortions. Poor power quality means longer melt time, lower productivity, energy losses and higher operating costs. If steel plants are connected to weak grids and fail to operate at full power or in daytime, production capacity is affected. Rolling mills may face similar power quality issues. Moreover, where steel plants are connected to the public grid, their operation may disturb any customers connected to the same bus.