Loading...

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

Sayyah, A ; Sharif University of Technology | 2008

698 Viewed
  1. Type of Document: Article
  2. DOI: 10.1631/jzus.A0820055
  3. Publisher: 2008
  4. Abstract:
  5. 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. © 2008 Zhejiang University and Springer-Verlag GmbH
  6. Keywords:
  7. AC motors ; Adaptive control systems ; Control systems ; Counting circuits ; Diesel engines ; Feedback control ; Genetic algorithms ; Harmonic analysis ; Modulation ; Motors ; Optimization ; Pulse modulation ; Torque ; Current harmonics ; Detrimental effects ; First quarters ; Frequency harmonics ; Harmonic currents ; Harmonic models ; High powers ; Low frequencies ; Optimal pulses ; Output voltages ; Pulse width modulation (PWM) ; Pulse-width modulations ; Speed fluctuations ; Switching angles ; Switching instants ; Torque components ; Torque pulsation ; Torque pulsations ; Total harmonic current distortion (THCD) ; Voltage source inverters ; Induction motors
  8. Source: Journal of Zhejiang University: Science A ; Volume 9, Issue 12 , 2008 , Pages 1741-1752 ; 1673565X (ISSN)
  9. URL: https://link.springer.com/article/10.1631/jzus.A0820055