| Abstract |
Using GTOs and microprocessor based control algorithms voltage source PWM frequency converters of up to 10000 kVA have been developed that can succesfully meet the requirements set by the metal industry. This paper describes the design and application of sectional drives for processing lines in the metal industry. First design and control of present day PWM frequency converters are examined. This is followed by a description of common DC bus system drives. Attention is paid to the communication of frequency converters with higher level automation systems. Practical examples serve to illustrate the application of PWM frequency converters in the metal industry. These include a galvanizing line consisting of 35 sections at the steel mill of Rautaruukki in Hämeenlinna, Finland, and an annealing and pickling line at the steel mill of Outokumpu in Tornio, Finland. |
