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A PWM INVERTER DRIVE SYSTEM WITH ON-LINE OPTIMIZED PULSE PATTERNS
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| Author(s) |
J. Holtz; S. Stadtfeld |
| Abstract |
A novel approach to the PWM problem is described which performs an on-line minimization of the inverter switching sequence. An algorithm implemented in a microcomputer is used to predict the future trajectories of the stator current space vector in the complex plane as functions of all posslble inverter switching states. This information is used to select the optimal switching state such that the switching frequency is minimized. The computing time for the optimization is a few tens of microseconds. The method is applicable to thyristor inverters having a switching frequency of a few hundred hertz. An extended algorithm is proposed for the applicatlon in fast switching power transistor or GTO lnverters. lt predicts the dynamic state of the drive system for the time instant at which the optimization will have to be made. This enables to complete the optimization just before the result is actually needed to control the system. |
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| Filename: | Unnamed file |
| Filesize: | 3.359 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-03-11 by System |
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