Compensated synchronous PI current controller in overmodulationrange and six-step operation of space-vector-modulation-basedvector-controlled drives
Khambadkone, A.M.; Holtz, J.
Industrial Electronics, IEEE Transactions on
Volume 49, Issue 3, Jun 2002 Page(s):574 - 580
Digital Object Identifier   10.1109/TIE.2002.1005382
Summary:Overmodulation enhances the power utilization of the installed capacity of a voltage-source inverter. A space-vector strategy is used for constant-switching-frequency inverters. In order to achieve the overmodulation, a modified reference signal with nonuniform angular velocity is generated using a preprocessor. Such a reference wave produces low-frequency harmonics in currents. The presence of current harmonics restricts the bandwidth of the synchronous proportional plus integral current controller in the overmodulation range. A compensating current control is presented to allow for high-bandwidth current control in synchronous coordinates during overmodulation and six-step. The proposed scheme allows for an easy upgrade of a conventional vector control scheme to include overmodulation and, thus, reduce the design-to-market time

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