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A solid state direct on line starter for medium voltage induction motors with minimized current and torque pulsations

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5 Author(s)
Cadirci, I. ; Inf. Technol. & Electron. Res. Inst., Tubitak-Bilten, Ankara, Turkey ; Ermis, M. ; Nalcacl, E. ; Ertan, B.
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This paper describes a thyristorized static switch which is designed and implemented specifically for frequent direct-on-line starting of medium voltage large induction motors. The circuit configuration chosen utilizes back-to-back connected series thyristor strings on two of the supply lines. Both the starting current and the torque pulsations of the induction motor are minimized by a controlled, nonsimultaneous switching of motor phases to the supply. This reduces the electrical stresses on the power system and the mechanical stresses on the shaft as compared to conventional switching elements. The optimum switching strategy is found by the use of a hybrid mathematical model in ABC/dqO form. The validity of the results obtained for medium voltage, squirrel-cage induction machine are verified by the use of a physical simulator consisting of a low voltage, small induction machine and a shaft torque measuring system. The system has been in operation successfully in an iron and steel plant since 1991

Published in:

Energy Conversion, IEEE Transactions on  (Volume:14 ,  Issue: 3 )

Date of Publication:

Sep 1999

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