Title :
Megawatt GTO-inverter with three-level PWM control and regenerative snubber circuits
Author :
Holtz, Joachim ; Salama, Samir F.
Author_Institution :
Wuppertal Univ., West Germany
Abstract :
Regenerative turn-on and turn-of snubbers for a three-level PWM inverter using gate turn-off thyristors (GTOs) are analyzed and discussed. Problems encountered in high-power GTO inverters, namely, trapped energy in the snubbers and switching losses, are discussed. The circuit configuration and operation are described and a comparison with a two-level inverter is made. Experimental results from the operation at reduced voltage of a 4 MVA phase-leg circuit are presented.<>
Keywords :
invertors; protection; pulse width modulation; thyristor applications; 4 MVA; GTO inverters; gate turn-off thyristors; phase-leg circuit; regenerative snubber circuits; snubber protection; switching losses; three-level PWM control; thyristor applications; two-level inverter; Capacitors; Circuits; Inductors; Power semiconductor switches; Pulse width modulation; Pulse width modulation inverters; Snubbers; Thyristors; Transformers; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE
Conference_Location :
Kyoto, Japan
DOI :
10.1109/PESC.1988.18270
