钢铁企业供电系统电能质量分析与研究OA

Nonlinear impact loads such as electric arc furnaces in iron and steel enterprises can easily lead to the deterioration of power grid power quality,causing problems such as protection malfunctions.Taking the frequent alarm of the stator asymmetric overload protection of the 1#electric-driven blower in the power grid of Bensteel as an example,through analysis of protection messages,power supply system structure,and load characteristics,the cause of the fault was identi-fied as the negative sequence current generated during the smelting process of the 3#ladle furnace operating on the same busbar.Harmonic testing verified that the original static compensation device could not effectively suppress the negative sequence component and the 5th harmonic.After mea-sures such as adjusting the operation mode and improving SVC dynamic compensation,the negative sequence current of the system was significantly reduced,harmonic content met the standards,and the problem of protection false alarms was resolved.