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AN ECONOMIC VERY HIGH POWER PWM INVERTER FOR INDUCTION MOTOR DRIVES
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| Author(s) |
J. Holtz; S. Stadtfeld; P. Lammert |
| Abstract |
A novel PWM inverter operates at high dc link voltage. The output voltage can assume three different levels (three-state inverter). The principle of temporary series connection of different power semiconductors avoids dynamic overvoltages that are usually encountered with series connected power switches. In the thyristorized version which is presented here, the commutation is performed with a single current pulse that is supplied by a comparatively small commutation capacitor. There are no high turn-on currents in the main thyristors. The high utilization of the active and passive components of the circuit permits the application at a high power level of several megawatts. The three different levels of the output voltage allow the operation at a low switching frequency with reduced harmonic currents. An optimal PWM control algorithm is implemented in a 16 bit microprocessor. Experimental results obtained with a 650 kVA induction motor drive system are presented. |
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| Filename: | Unnamed file |
| Filesize: | 3.724 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-03-11 by System |
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