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Optimal Pulsewidth Modulation of a Dual Three-Level Inverter System Operated From a Single DC Link

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3 Author(s)
Boller, T. ; Electr. Machines & Drives Lab., Univ. of Wuppertal, Wuppertal, Germany ; Holtz, J. ; Rathore, A.K.

Operating a dual three-level inverter system from a single dc link circuit is an economic solution for generating five-level output voltage waveforms and to double the output power compared to a single three-level inverter. Such an inverter system is used for feeding a drive motor with open stator windings. A mechanism is then required to reduce the common-mode voltage components of the motor voltages. This paper describes an offline optimization method that minimizes both the harmonic distortion of the motor currents and the common-mode voltage components. The optimization permits reduction of the switching frequency to a very low value of 200 Hz without compromising the harmonic distortion. High performance operation of the drive system at low switching frequency is experimentally demonstrated.

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Industry Applications, IEEE Transactions on  (Volume:48 ,  Issue: 5 )