Title :
Microprocessor based PWM inverter with third harmonic injection
Author :
El-Kassas, I.A. ; Hulley, L.N. ; Shepherd, W.
Author_Institution :
Junior Coll. of Technol. Al-ahsa, Al-Hofuf, Saudi Arabia
Abstract :
The use of a microprocessor system the MC68020, to generate a real PWM scheme to control a three-phase voltage source inverter based on the asymmetric regular sampling technique is described. One of the shortcomings of this scheme, which is the limitation placed on the fundamental voltage that cannot exceed 50% of the input DC voltage at unity depth of modulation, is partially avoided by the injection of a certain amount of third harmonics. A method of smooth variation of the output frequency is also described
Keywords :
PWM invertors; digital control; field effect transistor switches; microcomputer applications; power MOSFET; power engineering computing; power field effect transistors; power semiconductor switches; power system harmonics; switching circuits; voltage control; MC68020; PWM inverter; VSI; fundamental voltage; input DC voltage; microprocessor control; modulation depth; output frequency; third harmonic injection; three-phase; voltage source inverter; Clocks; Control systems; Equations; Frequency modulation; Microprocessors; Pulse width modulation; Pulse width modulation inverters; Sampling methods; Space vector pulse width modulation; Voltage;
Conference_Titel :
Power Electronics and Drive Systems, 1995., Proceedings of 1995 International Conference on
Print_ISBN :
0-7803-2423-4
DOI :
10.1109/PEDS.1995.405009
