Title :
Fully digital-controlled PWM inverter with software based modulation for AC machine control
Author :
Pedersen, John K. ; Thogersen, Paul
Author_Institution :
Inst. of Energy Technol., Aalborg Univ., Denmark
Abstract :
A fully digitally controlled PWM (pulsewidth-modulation) inverter is presented with software modulation suitable for three-phase open and closed-loop power control, particularly AC machine control. The inverter is a three-phase 30 kVA voltage source PWM inverter using triple Darlington modules, operating at a 1 kHz switching frequency. The power circuit, base drive circuit, control circuit, and interface for the computer are described and related to the protection and monitoring strategy. The software-based stator flux oriented asynchronous vector modulation is also described. Some test results are presented. The system is suitable for both simple open-loop applications and demanding closed-loop servo drives with field oriented control
Keywords :
AC machines; bipolar transistors; closed loop systems; digital control; invertors; machine control; power engineering computing; pulse width modulation; stators; 1 kHz; 30 kVA; AC machine control; asynchronous vector modulation; base drive circuit; closed-loop power control; closed-loop servo drives; digital-controlled PWM inverter; field oriented control; monitoring strategy; open loop power control; power circuit; protection; pulsewidth-modulation; software based modulation; software-based stator flux; switching frequency; three-phase; triple Darlington modules; voltage source PWM inverter; AC machines; Circuits; Digital control; Digital modulation; Open loop systems; Open source software; Power control; Pulse inverters; Pulse width modulation inverters; Voltage;
Conference_Titel :
Industrial Electronics Society, 1990. IECON '90., 16th Annual Conference of IEEE
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-87942-600-4
DOI :
10.1109/IECON.1990.149274
