DocumentCode :
2601691
Title :
A new current source converter using a symmetric gate commutated thyristor (SGCT)
Author :
Zargari, Navid ; Rizzo, Steven ; Xiao, Yuan ; Iwamoto, Hideo ; Sato, Katsumi ; Donlon, John
Author_Institution :
Rockwell Autom., Cambridge, Ont., Canada
Volume :
3
fYear :
2000
fDate :
2000
Firstpage :
1957
Abstract :
Extensive semiconductor development has gone into both bipolar and MOS structures for medium voltage (MV) applications. However the progression of MOS structures in MV applications has been difficult and the issues of module isolation, reliability, and dv/dt and motor/bearing life continue to limit its acceptance in these applications. A more suitable device structure and the natural choice for MV applications is the bipolar thyristor structure. The device that has been in use for many years, the GTO, is being replaced by the gate commutated thyristor (GCT). So far the GCT has been only thought of as fulfilling the needs for the voltage source topology. However, the symmetric GCT (SGCT) is viable and has significant advantages when implemented in a PWM current source inverter. This paper describes the design and characteristics of an 800 A, 6.5 kV SGCT and the effect of its implementation in a PWM-CSI. These effects include: operation at a higher switching frequency, elimination/reduction and modification of the snubber circuitry, reduction in size of the passive components, and a major impact on the cost of the converter. The paper includes experimental results on a 4160 V, 1250 hp, PWM-CSI AC drive
Keywords :
AC motor drives; PWM invertors; commutation; snubbers; thyristors; 1250 hp; 4160 V; 6.5 kV; 800 A; GTO; MOS structures; PWM current source inverter; PWM-CSI AC drive; bipolar structures; bipolar thyristor structure; current source converter; device structure; gate commutated thyristor; medium voltage; module isolation; motor/bearing life; passive components; reliability; snubber circuitry; symmetric gate commutated thyristor; voltage source topology; Circuits; Commutation; Costs; Medium voltage; Pulse width modulation; Pulse width modulation inverters; Snubbers; Switching frequency; Thyristors; Topology;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industry Applications Conference, 2000. Conference Record of the 2000 IEEE
Conference_Location :
Rome
ISSN :
0197-2618
Print_ISBN :
0-7803-6401-5
Type :
conf
DOI :
10.1109/IAS.2000.882146
Filename :
882146
Link To Document :
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