三电平变频器在鞍钢粗轧机主传动上的应用-控制工程专业个毕业论文.docx

三电平变频器在鞍钢粗轧机主传动上的应用Application 三电平变频器在鞍钢粗轧机主传动上的应用 Application of Three-level Inverter in Main Drive of Ansteel Rougher Mill Abstract Hot strip mill production line in steel production is the largest，highly technical，and relatively highly invested one．After nearly 30 years of construction，hot strip mill production line in China has made great leap in quantity and quality．However,the problems are still very prominent．The development of the national economy demands the improvement of the steel in quantity and quality．The equipments of the early production line have a low productivity．The energy consumption does not meet the requirements of the national energy policy．The pollution to the environment is becoming increasingly serious．High-grade quality products not be produced．Therefore，it is imperative for the iron and steel enterprises to have large-scale technology reformation for the old production line． This paper makes a research on the problem of upgrading the second stand reversing rougher mill(Rougher mill 2)electric drive systems in the Ansteel 1 780mm hot strip mill production line，relying on power electronic converter technology，power transmission technology，automatic control technology，as well as the rolling process automation technology．The upgrade is to achieve through the use of enhance electron injection gate transistor(IEGT)for the power element of the new three-level medium—voltage variable speed system TMdrive一70e2． Firstly，this article summarizes the main drive of hot rolling process requirements， describes the AC-·AC frequency control system and AC··DC··AC frequency control system in the practical application ofthe rolling mill．Secondly，it determines the final technical proposal after analyzing two technical proposals in Ansteel Rougher mill main drive．Thirdly，analysis shows the characteristics of Rougher mill the old inverter MELVEC-3000N and the new inverter TMdrive-70e2．And researches are made the characteristics of the gate tum·off thyristor(GTO