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OPTIMIZED AND NON-OPTIMIZED RANDOM MODULATION TECHNIQUES FOR VSI DRIVES
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| Author(s) |
F. Blaabjerg; J .K. Pedersen; L. Oestergaardt; R.L. Kirlin; A.M. Trzynadlowski; S. Legowski |
| Abstract |
Random pulse width modulation techniques are known to reduce acoustical noise and vibration in inverter fed ac drive systems. The randomization can easily be done by varying widths of individual switching intervals. A random modulation strategy can be optimized with respect to a given objective. Four such strategies are described and compared. Harmonic torques in an induction motor, switching
losses in the inverter, and the harmonic power in the spectrum of the inverter output voltage are targeted for optimization. Results of experimental investigation are presented for four random strategies and compared with fixed switching frequency operation. The test results show the random strategies flattern out the power spectra and acoustical spectra as well as vibrational test show a reduction in vibration using random modulated strategies. |
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| Filename: | Unnamed file |
| Filesize: | 451 KB |
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| Type |
Members Only |
| Date |
Last modified 2017-11-06 by System |
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