Title :
A new direct digital PWM technique for microprocessor-based PWM inverters
Author :
Kwon, Soon H. ; Choy, Ick ; Kim, K.H. ; Mok, H.S.
Author_Institution :
Yeungnam Univ., Kyongsan, South Korea
Abstract :
This paper describes a new pulse width modulation (PWM) scheme suitable for a microprocessor-based PWM inverter. Optimal switching patterns (i.e., width and position of the pulses) minimizing a performance index can be generated in real time by numerical calculation using the microprocessor-based control system. The switching patterns and harmonics of the output waveforms have been investigated by simulation. This PWM method is compared with conventional methods, such as the natural PWM and the direct PWM. The simulation results show that the proposed scheme has much less low-order harmonics than the other methods. Finally, the microprocessor-based implementation of the scheme is presented. The validity of the proposed method is verified by experiments using a microprocessor-based control system
Keywords :
PWM invertors; digital control; harmonics; microcomputer applications; minimisation; performance index; power engineering computing; power system harmonics; switching circuits; direct digital PWM technique; microprocessor-based PWM inverters; microprocessor-based control system; optimal switching patterns; output waveform harmonics; performance index minimisation; real time; switching patterns; Control systems; Microprocessors; Optimal control; Pulse generation; Pulse width modulation; Pulse width modulation inverters; Real time systems; Space vector pulse width modulation; Switches; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1996. PESC '96 Record., 27th Annual IEEE
Conference_Location :
Baveno
Print_ISBN :
0-7803-3500-7
DOI :
10.1109/PESC.1996.548749
