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QUICK RESPONSE AND LOW-DISTORTION CURRENT CONTROL FOR MULTIPLE INVERTER-FED INDUCTION MOTOR DRIVES
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| Author(s) |
M. Hombu; T. Ikimi; A. Ueda; N. Kawakami; J. Takahashi; K. Kamiyama |
| Abstract |
This paper describes a PWM control method to balance two unit inverter currents and to reduce the distortion of motor currents in a multiple GTO inverter for large capacity ac variable-speed drive systems. For an 11-kW induction motor driven by a 15-kVA multiple inverter, the imbalance current can be reduced to less than 5 % of the rated motor current and the motor current waveform can be made very close to sinusoidal. The GTO switching frequency in the multiple inverter can be lowered to a quarter of that in the single inverter. In a 2750-kVA GTO inverter drive system which was developed based on the 15-kVA multiple inverter, excellent performance is obtained including unity power factor operation at an ac power source, smooth 4-quadrant operation and quick speed response of 87 rad/s. The quick response is realized by field oriented control with decoupling control between torque and exciting currents, and direct control of three-phase ac currents. In the future, the multiple GTO inverter is expected to be applied to rolling mill drives instead of cycloconverters. |
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| Filename: | Unnamed file |
| Filesize: | 3.32 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-07-19 by System |
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