New Approach to a High-Power GTO PWM Inverter for AC Motor Drives

A control method for GTO PWM inverter parallel-set operation and a new protection system for prevention of short-circuit faults caused by turn-off failure, both to realize a high-power drive system are described. Timing control of GTO gate pulse command provided by a feedback loop, and a reactor at...

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Bibliographic Details
Published in:IEEE transactions on industry applications 1987-03, Vol.IA-23 (2), p.263-269
Main Authors: Hashii, Makoto, Kousaka, Kenji, Kaimoto, Masahiro
Format: Article
Language:English
Subjects:
AC motors
Applied sciences
Control systems
Electrical engineering. Electrical power engineering
Electrical machines
Exact sciences and technology
Feedback loop
Inductors
Industry Applications Society
Protection
Pulse width modulation inverters
Regulation and control
Thyristors
Timing
Voltage control
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Summary:A control method for GTO PWM inverter parallel-set operation and a new protection system for prevention of short-circuit faults caused by turn-off failure, both to realize a high-power drive system are described. Timing control of GTO gate pulse command provided by a feedback loop, and a reactor at the output of the inverter can minimize the cross current flowing between inverters and can balance the output current of each inverter in inverter parallel-set operation. This method eliminates the necessity of selecting GTO's of equal characteristics, and can apply to parallel-set operation of three or more inverters. The new protection system judges the on and off states of the GTO from the GTO gate-cathode voltage and detects turn-off failure of the GTO. This method positively stops the inverter system safely and reliably upon turn-off failure of the GTO. Experiments are carried out on a 30-kVA inverter and two sets of 450-kVA GTO inverters.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.1987.4504901