Abstract
In this paper several new techniques to reject dc-link voltage ripple in PWM inverters are examined in detail. It is demonstrated how continuous elimination of harmonics is achieved at the inverter output while simultaneously rejecting the dc-link voltage ripple. Thus with the proposed techniques it is possible to guarantee high quality inverter output voltage even with substantial low frequency voltage ripple on the dc-link. A thorough modeling of these techniques along with the tradeoffs involved in acquiring the immunity to dc-link ripple is illustrated in detail. Potential applications of these techniques are in fixed and variable frequency inverters for power supplies and ac motor drives which experience voltage ripple in the dc-link such as when fed from a weak ac system which is frequently unbalanced. Suitable design equations along with a digital implementation procedure of the proposed technique is described in detail. Finally, selected results are verified experimentally on a laboratory inverter.
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