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A Carrier-Based PWM Modulation Technique for Balanced and Unbalanced Reference Voltages in Multiphase Voltage-Source Inverters

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2 Author(s)
Karugaba, S. ; Dept. of Electr. Eng., Dares Salaam Inst. of Technol., Dares Salaam, Tanzania ; Ojo, O.

The advancement in power electronics has made the use of any number of phases in ac machines possible since with the inverter, any number of phase voltages can be realized as long as the corresponding inverter exists. To supply multiphase drives requires multiphase voltage source inverters (VSIs) whose output voltages depend very much on the methods of generating the pulses to turn on and turn off the inverter devices appropriately. This paper presents an analytical technique for the determination of the expressions for the modulation signals used in the carrier-based sinusoidal and generalized discontinuous pulse width modulation schemes for two-level, five-phase voltage source converters. These expressions can be used for both balanced and unbalanced phase voltages generated by any two-level multiphase inverter, in generating the required reference signals appropriately. An example of a five-phase VSI is presented to illustrate the strategy. Simulation and experimental results are presented in which a close examination shows that both results are similar for the balanced and unbalanced load voltage cases.

Published in:

Industry Applications, IEEE Transactions on  (Volume:48 ,  Issue: 6 )

Date of Publication:

Nov.-Dec. 2012

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