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Multicarrier PWM with DC-Link Ripple Feedforward for Multilevel Inverters
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| Author(s) |
Samir Kouro, Mauricio Angulo, Jose Rodriguez, Jorge Pontt |
| Abstract |
Multilevel inverters have become an attractive
alternative for medium voltage and power quality demanding
applications. However, like most power converter families,
multilevel inverters are controlled with modulation techniques
that are conceptually based on nonlinear waveform
synthesis assuming constant dc-link voltages. Nevertheless,
real applications have load and supply dependent dc-links
that usually present important low frequency ripple. Due to
the high switching frequency operation of the converter and
the low-pass nature of the loads, the dc-link ripple is also
modulated and transmitted to the load, generating undesired
low frequency voltage and current distortion. This can be
critical in high power applications due to the amount of
energy involved in these harmonics. This paper introduces
a simple but effective dc-link ripple feedforward strategy
into traditional carrier-based modulation techniques, which
eliminates the undesired harmonics. Experimental results
show the accuracy of the proposed method, which is specially
useful for open loop applications. |
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| Filename: | T3-206.pdf |
| Filesize: | 715.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-08 by System |
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