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A large-capacity GTO inverter with low-loss snubber circuits

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5 Author(s)
Kawakami, N. ; Hitachi Ltd., Ibaraki, Japan ; Ueda, S. ; Hombu, M. ; Ueda, A.
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A large-capacity inverter using high-power gate turn-off (GTO) thyristors that can be used instead of a cycloconverter in AC drives is presented. With the techniques of multiple configuration and GTO series connection, the inverter capacity is increased effectively. High conversion efficiency is obtained by using low-loss snubber circuits for GTOs. It is confirmed that the low-loss snubber circuits using energy recovery units (ERUs) have good performance in pulse-width modulated (PWM) operation. High-energy recovery efficiency is obtained, especially in leading operation (turn-on operation when freewheeling diodes conduct). These snubber circuits have superior ability for clamping overvoltage at GTO turn-off. A 2750 kVA inverter with low-loss snubber circuits using high-power GTOs has been fabricated and evaluated

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Industry Applications, IEEE Transactions on  (Volume:29 ,  Issue: 6 )