Study on evaluation system and power supply scheme for large-scale and extra-high power electric arc furnace connected to the grid

摘要

This paper analyzes adverse effect of electric arc furnace impact load on grid power quality and generator operation etc., starting from operating characteristics of electric arc furnace, and proposes evaluation system, evaluation program, and treatment measures for connection of EAF to grid. Through study of factors affecting power supply scheme for large scale extra-high power electric arc furnace, it is known that the key of power supply scheme selection is voltage fluctuation and flicker caused by connection of EAF to grid and the effect on generator shafting. Using the distributed power supply scheme for the 6 extra-high power EAF in Zhangjiagang region as an instance, an improved scheme of power supply to large scale extra-high power EAF is proposed, i.e. construction of 500 kV Jinfeng Substation that will be exclusively used for EAF loads. Results of simulation show that this scheme can greatly improve public supply network power quality and reduce effect on generator shafting.