Title :
Asymmetrical modulation and over-modulation techniques of parallel connected NPC-PWM inverters for AC motor drives
Author :
Matsui, K. ; Kawata, Yasutaka ; Ueda, Fukashi ; Tsuboi, Kazuo ; Iwata, Koji
Author_Institution :
Dept. of Electr. Eng., Chubu Univ., Kasugai, Japan
Abstract :
A technique of parallel connection of power devices using current sharing reactors for neutral point clamped (NPC) PWM inverters is reported in this paper. The proposed modulation techniques can improve the output characteristics such as output voltage level or output harmonics. The output voltage waveforms of the proposed inverter have certain voltage levels during their half cycles, thus it is anticipated that it will be difficult to analyze the output waveforms. For such waveforms, a frequency analysis approach is described, whose results are verified by experiments
Keywords :
AC motor drives; DC-AC power convertors; PWM invertors; machine testing; machine theory; power system harmonics; waveform analysis; AC motor drives; asymmetrical modulation; current sharing reactors; experiments; frequency analysis approach; half cycles; neutral point clamped PWM inverters; output harmonics; output voltage level; output voltage waveforms; over-modulation techniques; parallel connection; Inductors; Leg; Phase modulation; Pulse width modulation; Pulse width modulation inverters; Switching frequency; Voltage;
Conference_Titel :
Advanced Motion Control, 1996. AMC '96-MIE. Proceedings., 1996 4th International Workshop on
Conference_Location :
Mie
Print_ISBN :
0-7803-3219-9
DOI :
10.1109/AMC.1996.509423
