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COMPARATIVE INVESTIGATION OF RANDOM PWM TECHNIQUES WITH VARIABLE SWITCHING FREQUENCY AND PULSE POSITION FOR INVERTER-FED INDUCTION MOTORS
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| Author(s) |
M. Becht; F. Blaabjergt; J. K. Pedersent; A. M. Trzynadlowski |
| Abstract |
This paper compares experimentally two different random modulation techniques for inverter-fed
induction motors. The first technique is random switching frequency modulation and the seco.nd is random
pulse position modulation. The comparison is done on the basis that the switching losses are fixed in the
inverter and the traditional space vector modulation is used as a reference with 5kHz switching frequency.
Methods to determine the average inverter pulse frequency and how to generate random switching
frequencies with uniform density are also presented. The experimental results show fixed switching
frequency operation and random pulse position give most distinct harmonics in both current, voltage and
sound spectra. Random switching frequency with a frequency band of 5 kHz gives more distributed
spectra that in some cases are less annoying. However, there is also a higher risk to trigger resoriances. |
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| Filename: | Unnamed file |
| Filesize: | 567.8 KB |
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| Type |
Members Only |
| Date |
Last modified 2016-03-16 by System |
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