Title :
A three-phase AC-DC GTO thyristor converter employing equal pulse width modulation (EPWM) (for DC motor control)
Author :
Khan, B.H. ; Droadla, S.R. ; Dubey, G.K.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol., Kanpur, India
Abstract :
A comparative study of equal, triangular, stepped, sinusoidal, and inverted sinusoidal pulse-width modulation (PWM) schemes on source and load performances of a three-phase AC-DC GTO thyristor converter-fed DC motor is presented. The two-quadrant GTO thyristor converter is studied in detail using an equal PWM (EPWM) scheme. A symmetrical gate pulse pattern that reduces the number of switchings and allows switching GTOs an equal number of times in each supply cycle is reported. Smooth and continuous transition is obtained between rectification and inversion with a single GTO converter. The proposed converter was designed, constructed, and tested using a 3 hp laboratory-sized separately excited DC motor. The experimental results are shown to be in good agreement with the theory.<>
Keywords :
DC motors; machine control; power convertors; pulse width modulation; thyristor applications; velocity control; 3 hp; DC motor; EPWM; equal pulse width modulation; inversion; load performances; power convertors; rectification; source performance; switchings; symmetrical gate pulse pattern; three-phase AC-DC GTO thyristor; Analog-digital conversion; Commutation; DC motors; Delay; Pulse modulation; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Thyristors; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96749
