Mitigating circulating common-mode currents between parallel soft-switched drive systems
Cuzner, Robert M.
Nowak, Daniel J.
Julian, Alexander L.
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A mathematical model that is developed for a generalized drive system, including common-mode passive and active elements, is used to explore the issues of paralleling soft-switched resonant dc-link drive systems. Differences between the modulation pattern for each drive system cause common voltage disturbances, which lead to significant circulating currents between the drive systems. Control methods for actively compensating for common-mode circulating currents or reducing the commonmode voltage disturbances are investigated. Practical modifications to the drive system controls are implemented to reduce the circulating currents between paralleled systems.
The article of record as published may be found at http://dx.doi.org/10.1109/TIA.2007.904415
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