Research And Application Of Scale Shear System Inverter Harmonic Control

Frequency conversion technology is integrating automatic control, microelectronics, power electronics, and communication technology in the integration of high-tech technology. It with a good speed regulation, energy-saving performance in the professions, has been widely used. But it also brought some interference problems. The scene of the power supply and power consumption equipment will be in frequency converter produces an effect, inverter generated during the running of HHG also can interfere with the surrounding the operation of equipment. Inverter produce harmonic will reduce power equipment using life and impact of electrical components normal work, will make the relay protection and automatic device, and make the misoperation of instrument and electricity measurement error, appear larger to nearby communications system to produce interference, make communication system cannot work normally. Influence of electronic equipment operating precision, make the precision machining product quality decreased. Tianjin steel Co., LTD. By2the steel rolling mill is bar threads.75million tons, annual single-lane design with rebar, half-round bars give priority to, and produce grail volume and fine rolling rebar ability. But so far from2006formally put into production, exposed out many questions. Scale shear system of all kinds of faults, became the important factors which restricts production.Based on Tianjin Iron&Steel Group Co., Ltd scale shear system for background, by analyzing the scale shear system is production technology, on the basis of its occurrence of all kinds of faults conducted a comprehensive analysis and research to find fault frequent harmonic frequency converter interference is one of the main reasons. Based on this, the harmonic wave to study the influence of electric equipment, the harmonic interference and suppressing measures, proposed by passive filter, active power filter, to the jamming signal isolation, shielding and grounded means to suppress harmonic wave interference suppression method.In combination with the engineering practice conditions, to scale shear system reform, this text discussed the method applied to reality system. The actual operation shows that the whole system satisfies the scale shear system process requirement and control requirements, reduced Tianjin Iron&Steel Group Co., Ltd operating costs, guarantee the quality of the products.