Title :
An improved single phase to three phase converter for low cost AC motor drives
Author :
Covic, Grant A. ; Peters, Grant L. ; Boys, John T.
Author_Institution :
Dept. of Electr. & Electron. Eng., Auckland Univ., New Zealand
Abstract :
A low cost four quadrant single phase to three phase converter for AC drives is described. The technique uses a single phase reversible rectifier operating at unity power factor to produce a balanced DC supply at a controlled high voltage using two IGBT power transistors. Four additional IGBT power switches operate on this high voltage to produce two pulse width modulated (PWM) waveforms using a novel space vector modulation (SVM) strategy. A three phase motor load is then connected to the centre of the DC supply, and the two PWM voltages, to give a four quadrant reversing AC drive. The unique feature of this system is the modulation strategy, which achieves higher motor voltages than any previous published method while achieving excellent harmonic suppression at high efficiency in motor sizes restricted to the rating of the single phase supply (typically 2 kW)
Keywords :
AC motor drives; AC-AC power convertors; PWM power convertors; insulated gate bipolar transistors; power factor; power semiconductor switches; power system harmonics; rectifying circuits; switching circuits; 2 kW; IGBT power switches; IGBT power transistors; balanced DC supply; four quadrant converter; harmonic suppression; high efficiency; low cost AC motor drives; modulation strategy; pulse width modulated waveforms; reversing AC drive; single phase supply; single phase to three phase converter; three phase motor load; AC motors; Costs; Insulated gate bipolar transistors; Power transistors; Pulse width modulation; Reactive power; Rectifiers; Space vector pulse width modulation; Support vector machines; Voltage control;
Conference_Titel :
Power Electronics and Drive Systems, 1995., Proceedings of 1995 International Conference on
Print_ISBN :
0-7803-2423-4
DOI :
10.1109/PEDS.1995.404863