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ANALYSIS OF THE HARMONICS IN VOLTAGE FED INVERTER DRIVES CAUSED BY PWM SCHEMES WITH DISCONTINUOUS SWITCHING OPERATION
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| Author(s) |
Heinz van der Broeck |
| Abstract |
This paper deals with the pulse width modulation (PWM) for three phase voltage fed inverter drives. A review is made on established PWM strategies with continuous and discontinuous switching operation. Although PWM schemes with discontinuous switching operation generate higher harmonics than the optimum space vector PWM they are of special interest because of their lower switching losses. A new PWM scheme is presented which leaves the outputs of the inverter legs one after another on the negative rail of the DC supply voltage for 120° intervals. The mean squared value of the harmonic content of the current caused by this PWM scheme in a three phase load as well as the relative reduction of the switching losses are determined. The analysis is based on the characteristic drive parameters resulting in pure analytical equations for general use. A comparison is made to the corresponding currents of established PWM schemes. In a final evaluation application areas for the different PWM schemes with continuous and discontinuous switching operation are shown. |
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| Filename: | Unnamed file |
| Filesize: | 3.825 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-15 by System |
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