New Methods for the Active Compensation of Unbalanced Supply Voltages for Two-Stage Direct Power Converters

概要

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Unbalanced supply voltages can be fully compensated in boost type power converters with active front end if sufficient energy storage is provided by the DC-link capacitor. In converters that have no energy storage, for example in a matrix converter, the maximum voltage transfer ratio will be limited if one or more input lines is at a reduced voltage. Control techniques to compensate the effect of unbalanced voltage supply for matrix converters allow for a limited output voltage and power capabilities, which depends on the level of unbalance. This paper proposes the utilization of the clamp capacitor, which is normally needed to protect a Direct Power Converter (DPC), to extend the operating range of a Two-Stage DPC during unbalanced supply conditions preserving its theoretic maximum voltage transfer ratio capability. A new topology based on a hybrid approach, consisting of an H-bridge inverter inserted into the intermediary link, which is also able to preserve the output voltage capability under unbalanced supply conditions, is proposed. Both solutions are validated through simulations.
社団法人電気学会の論文
2006-05-01