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

Volume

1

fYear

1996

fDate

6-10 Oct 1996

Firstpage

174

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Conference, 1996. Thirty-First IAS Annual Meeting, IAS '96., Conference Record of the 1996 IEEE

Conference_Location

San Diego, CA

ISSN

0197-2618

Print_ISBN

0-7803-3544-9

Type

conf

DOI

10.1109/IAS.1996.557012

Filename

557012