Title :
Two-phase modulation technique for three-level inverter fed AC drives
Author :
Halász, S. ; Huu, B.T. ; Zakharov, A.
Author_Institution :
Dept. of Electr. Machines & Drives, Budapest Tech. Univ., Hungary
Abstract :
Two-phase dipolar and unipolar modulation techniques for three-level inverters are suggested and compared with conventional three-phase ones. Two-phase PWMs with 60° (0° and ±30° shift) and 120° cycles are investigated from the point of view of harmonic losses, motor voltage spectra and torque pulsations. It is shown that two-phase dipolar PWMs have no advantages in comparison with three-phase PWMs. At the same time two-phase unipolar PWMs-in contrast with three-phase PWMs-considerably decrease the motor harmonic losses and torque pulsations in the whole motor voltage region
Keywords :
AC motor drives; PWM invertors; harmonics; losses; AC drives; harmonic losses; motor harmonic losses decrease; motor voltage region; motor voltage spectra; three-level inverter; torque pulsations; two-phase PWM; two-phase dipolar modulation; two-phase modulation technique; two-phase unipolar modulation; Commutation; DC motors; Frequency; Phase modulation; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Subspace constraints; Torque; Voltage control;
Conference_Titel :
Electrotechnical Conference, 1998. MELECON 98., 9th Mediterranean
Conference_Location :
Tel-Aviv
Print_ISBN :
0-7803-3879-0
DOI :
10.1109/MELCON.1998.699426
