Title :
Space vector modulation schemes for a five-phase voltage source inverter
Author :
Iqbal, A. ; Levi, E.
Author_Institution :
Sch. of Eng., Liverpool John Moores Univ.
Abstract :
Application of power electronics in electric drives enables utilisation of AC machines with a phase number higher than three. Such multiphase motor drives are nowadays considered for various applications. Multiphase drives are invariably supplied from multiphase voltage source inverters (VSIs) and adequate methods for VSI pulse width modulation (PWM) are therefore required. This paper analyses different space vector PWM (SVPWM) schemes for a five-phase VSI, which can be used for five-phase motor drives. A detailed model of a five-phase VSI is presented first in terms of space vectors. Next, the existing technique of utilising only large space vectors is elaborated. It is shown that this SVPWM method leads to generation of high amounts of low-order output voltage harmonics. Finally, a novel SVPWM method is introduced, which enables operation with pure sinusoidal output voltages up to a certain reference voltage value, which is smaller than the maximum achievable with the given DC link voltage. To enable full utilisation of the DC bus voltage, this SVPWM scheme is complemented with another one, which unavoidably does lead to generation of some low order harmonics. These harmonics are however of significantly lower values than when only large vectors are used. A detailed performance evaluation of the existing and newly developed schemes is done and it is presented in terms of quality of the output voltage waveforms. Simulation results are included throughout the paper to illustrate and verify the theoretical considerations
Keywords :
AC motor drives; PWM invertors; harmonic analysis; AC machine drives; five-phase voltage source inverter; low-order output voltage harmonics; multiphase motor drives; performance evaluation; power electronics; pulse width modulation; space vector PWM; space vector modulation schemes; Control systems; Impedance; Motor drives; Phase modulation; Power electronics; Pulse width modulation converters; Pulse width modulation inverters; Space vector pulse width modulation; Stators; Voltage; Converter control; Multi-machine system; Multiphase drive; Pulse width modulation;
Conference_Titel :
Power Electronics and Applications, 2005 European Conference on
Conference_Location :
Dresden
Print_ISBN :
90-75815-09-3
DOI :
10.1109/EPE.2005.219194