Title :
Large capacity high performance 3-level GTO inverter system for steel main rolling mill drives
Author :
Okayama, Hideo ; Uchida, Ryohei ; Koyama, Masato ; Mizoguch, Shoji ; Tamai, Shinzo ; Ogawa, Haruki ; Fujii, Toshiyuki ; Shimomura, Yasuhito
Author_Institution :
Ind. Electron. & Syst. Lab., Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
This paper proposes a high performance 10 MVA 3-level GTO inverter system for steel main rolling mill drives, which consists of a three-level power converter, a three-level inverter and two series-connected DC-link capacitors with a neutral point. To realize this system, newly developed 6-inch 6 kV-6 kA GTOs have been applied first in the world. A novel regenerative snubber circuit topology is proposed to maximize power conversion efficiency of the system and to guarantee maximum turn-off current capability of 6 kA of GTOs implemented in the main circuit. By applying high power factor control of the power converter and high performance vector control of a synchronous motor, a high performance GTO inverter system has been realized. Experimental results using a 6000 kW synchronous motor demonstrate the availability of this inverter system for steel main rolling mill drives
Keywords :
DC-AC power convertors; PWM invertors; rolling mills; snubbers; steel industry; synchronous motor drives; thyristor convertors; 10 MVA; 6 in; 6 kA; 6 kV; 6000 kW; maximum turn-off current capability; power conversion efficiency; power factor control; regenerative snubber circuit topology; series-connected DC-link capacitors; steel rolling mill drives; three-level GTO inverter system; three-level power converter; vector control; Capacitors; Circuit topology; Control systems; Inverters; Milling machines; Power conversion; Reactive power; Snubbers; Steel; Synchronous motors;
Conference_Titel :
Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3544-9
DOI :
10.1109/IAS.1996.557012
