JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A 2008 Vol.9 No.12 P.1741-1752

http://doi.org/10.1631/jzus.A0820055

Optimization of total harmonic current distortion and torque pulsation reduction in high-power induction motors using genetic algorithms

Author(s): Arash SAYYAH, Mitra AFLAKI, Alireza REZAZADEH
Affiliation(s): Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA; more
Corresponding email(s): sayyah1@uiuc.edu, mitra.aflaki@gmail.com, alireza.rezazade@gmail.com
Key Words: Induction motor, Genetic algorithm (GA), Optimization, Pulse width modulation (PWM), Torque pulsation, Total harmonic current distortion (THCD)

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Abstract: This paper presents a powerful application of genetic algorithm (GA) for the minimization of the total harmonic current distortion (THCD) in high-power induction motors fed by voltage source inverters, based on an approximate harmonic model. That is, having defined a desired fundamental output voltage, optimal pulse patterns (switching angles) are determined to produce the fundamental output voltage while minimizing the THCD. The complete results for the two cases of three and five switching instants in the first quarter period of pulse width modulation (PWM) waveform are presented. Presence of harmonics in the stator excitation leads to a pulsing-torque component. Considering the fact that if the pulsing-torques are at low frequencies, they can cause troublesome speed fluctuations, shaft fatigue, and unsatisfactory performance in the feedback control system, the 5th, 7th, 11th, and 13th current harmonics (in the case of five switching angles) are constrained at some pre-specified values, to mitigate the detrimental effects of low-frequency harmonics. At the same time, the THCD is optimized while the required fundamental output voltage is maintained.

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