Research On Power Quality Control Methods Of Lectromagnetic Station Based On The STATCOM

As the large company of consuming electrical energy, the power loss will impact the improvement of product cost in iron and steel enterprise directly, at the same time weaken the competitiveness of the products, which is not conducive to the development of the enterprise in the future. Therefore, improving the quality and reducing the loss is the key to the iron and steel enterprises. According to the Jilin Province Science and Technology Development Project "the research and development of harmonic suppression and power factor compensation in electric furnace system", the paper takes the103#electric furnace as the research object, and studies the integrated governance program of loss reduction and energy saving.As the important place of voltage transform, the electromagnetic station often appears the bad situations:the harmonic current in low (high) side is high, and the power factor is low, and the reactive power is too big, which impact on the quality of power supply of electric furnace directly, and reduce the steel-making efficiency of electric furnace. Based on the problems above all, the paper presents a detailed analysis of the short-net structure and working characteristic in103#electric furnace, and establishes the mathematical model of short circuit, and calculates the maximum reactive power the system required. According to the reactive power compensation technology, the paper presents segmented compensation control method and develops a set of comprehensive compensation device, with static synchronous compensator STATCOM for reactive power compensation and passive filter PF for harmonic suppression. The device realizes the comprehensive treatment contained reactive compensation and harmonic suppression, and it improves the power supply quality of electric net.Through the field data analysis, the results show that the power factor compensates from0.78to0.85, and the active power of electric furnace transformer is improved effectively, and the current in transformer primary side is reduced by10%. The harmonic suppression effect is obvious, and it reaches to the purpose of reducing power loss.