Title :
A new approach to advanced cold mill drive systems
Author :
Seok, Jul-Ki ; Chung, Dae-Woong ; Song, Seung-Ho ; Sul, Seung-Ki ; Kwon, Byung-Ki ; Park, Ga-Woo ; Shin, Won-Chang ; Cho, Eung-Sang ; Lee, Jin-Seop ; Chang-ho Choi
Author_Institution :
Dept. of Electr. Eng., Seoul Nat. Univ., South Korea
Abstract :
This report describes an advanced 1000 kVA AC cold mill drive systems in a modern steel manufacturing facility. The presented systems consist of an AC-to-DC PWM power converter and two PWM inverters to drive each 700 kW induction motor, and all algorithms are implemented using a TMS 320C40 digital signal processor (DSP) system that provides high computing power by employing a high level of parallel processing. The displacement power factor of the input line current is always unity and total power factor including harmonics is higher than 98%. The common DC link voltage is regulated within 1% of its rated value regardless of input voltage fluctuation and output load transient. The system achieves 1:5 field weakening control range. The available speed control bandwidth of the motor is about 60 Hz and torque bandwidth is about 350 Hz. Since July 1997, it has been operating with full capacity at Pohang steel mill company (Posco) in Kwang-yang, Korea
Keywords :
AC-DC power convertors; PWM invertors; PWM power convertors; cold rolling; harmonic distortion; induction motor drives; machine control; parallel processing; power factor correction; power system harmonics; process control; rectifying circuits; rolling mills; steel industry; torque control; velocity control; 1000 kVA; 1:5 field weakening control range; 350 Hz; 60 Hz; 700 kW; AC cold mill drive system; AC-to-DC PWM power converter; Korea; PWM inverters; TMS 320C40 digital signal processor; common DC link voltage; harmonics; induction motor; input voltage fluctuation; output load transient; parallel processing; speed control bandwidth; steel manufacturing facility; torque bandwidth; unity displacement power factor; Bandwidth; Digital signal processors; Induction motors; Milling machines; Production facilities; Pulse width modulation converters; Pulse width modulation inverters; Reactive power; Signal processing algorithms; Steel;
Conference_Titel :
Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-4067-1
DOI :
10.1109/IAS.1997.626361
