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PULSE POSITION MODULATION FOR INVERTER-FED AC DRIVES
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| Author(s) |
X. Gao; J. Richardson |
| Abstract |
Pulse position modulation (PPM) is a new technique which complements existing PWM strategies. PPM has the advantage of ease of pulse generation and control without complex circuitry. This development outlines the theoretica] development and practical implementation of the technique for a 3-phase inverter-fed a.c. induction drive system. The scheme is shown to be somewhat simpler and more flexible than that of near-optimal PWM control. No extensive arithmetic operations are required to produce the inverter gate triggering trains. The attraction of slightly reduced pulse widths in PPM control enables higher switching frequencies. Spectrum analyses of PPM waveforms are obtained numerically and compared with practical results. The disadvantage of a somewhat higher total harmonic distortion with PPM is not considered detrimental for a.c. drives. |
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| Filename: | Unnamed file |
| Filesize: | 2.048 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-15 by System |
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