Title :
Carrier-based PWM-VSI overmodulation strategies: analysis, comparison, and design
Author :
Hava, Ahmet M. ; Kerkman, Russel J. ; Lipo, Thomas A.
Author_Institution :
Yaskawa Electr. America Inc., Northbrook, IL, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
In this paper, the overmodulation region voltage-gain characteristics and waveform quality of carrier-based pulsewidth-modulated (PWM) methods are investigated. Through detailed analytical study, voltage-gain characteristics are extracted independent of carrier frequency. The influence of blanking time and minimum pulsewidth (MPW) control on the inverter gain characteristics are studied and shown to be significant. A comparative evaluation of the modulator characteristics reveals the advantageous high-modulation-range characteristics of discontinuous PWM methods and, in particular, the superior overmodulation performance of a discontinuous PWM method. The modulation methods under consideration are tested on a PWM voltage-source inverter (VSI)-fed induction motor drive in the laboratory, and the theoretical results are verified by experiments. Also, a gain linearization technique is presented and experimentally verified. The results of this study are useful in the design, performance prediction and development of high-performance overmodulation strategies for PWM-VSI drives
Keywords :
DC-AC power convertors; PWM invertors; harmonic distortion; linearisation techniques; power system harmonics; PWM VSI; blanking time; carrier-based overmodulation strategies; design; discontinuous PWM method; gain linearization technique; induction motor drive; minimum pulsewidth control; performance analysis; performance prediction; voltage-gain characteristics; voltage-source inverter; waveform quality; Blanking; Frequency; Induction motor drives; Laboratories; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Testing; Voltage;
Journal_Title :
Power Electronics, IEEE Transactions on
