Title :
Space vector modulator for forced commutated cycloconverters
Author :
Huber, Láasló ; Borojevic, D.
Author_Institution :
Inst. for Power & Electron. Eng., Novi Sad Univ., Yugoslavia
Abstract :
A pulse-width modulation (PWM) control technique for forced commutated cycloconverters is presented. The technique is based on the space vector representation of the voltages in the complex plane. It is shown that with the allowable switching combinations, six output voltage space vectors with varying amplitudes can be obtained, in addition to the zero vector. The variation is compensated by adapting the standard modulation technique. The technique permits space vector synthesis of a three-phase, nonsymmetrical, nonsinusoidal output voltage, even under non-steady-state conditions, which is essential for the control of AC servo drives. A detailed explanation of the modulator principles and the switch control as well as simulation results for the time- and frequency domain analysis is given. The results are compared with the results obtained using the standard modulation technique. A possible microprocessor implementation of the modulator is also proposed.<>
Keywords :
AC motors; commutation; cycloconvertors; electric drives; machine control; pulse width modulation; servomotors; AC servo drives; PWM; forced commutated cycloconverters; frequency domain analysis; machine control; microprocessor; output voltage; pulse-width modulation; space vector representation; switching; three-phase; time-domain analysis; Analytical models; Force control; Frequency domain analysis; Microprocessors; Pulse width modulation; Servomechanisms; Space vector pulse width modulation; Switches; Voltage control; Zero voltage switching;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96746