<p>Induction Motors (IM) are extensively deployed in industrial processes, but its high starting current necessitates the use of a reliable soft starting mechanism. However, soft starting increases the current ripples, which in turn is detrimental to the motor speed and lifespan. Therefore, an advanced control strategy using Vienna rectifier, which focuses on providing Power Factor (PF) unity, improved Power Quality (PQ), lower starting current, reduced harmonic distortion and precise speed control of IM, is presented in this work. Moreover, the approach uses Space Vector Pulse Width Modulation (SVPWM) for controlling Vienna rectifier to achieve excellent DC utilization and reduced harmonic distortion. The SVPWM also enables the Vienna rectifier to achieve high output voltage with low modulation index. An Artificial Flora Optimization (AFO) based Proportional Integral (PI) controller is implemented to fine-tune the speed control of IM and ensure a stable operation across varying load conditions. Additionally, Modified SVPWM, which combines the advantages of Discontinuous PWM and SVPWM, is also employed for the IM control as it addresses challenges like current distortion during zero-crossing and mid-point voltage imbalance. The appraisal is conducted with simulations using MATLAB and validation with a lab-scale prototype. The attained results accredit to the effectiveness of the proposed technique in providing superior motor control and compliance with industrial standards for energy efficiency.</p>

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A Novel Control Approach to Improve Power Factor in Three-Phase Induction Motor Systems implementing Vienna Rectifier

  • A. A. Mohamed Faizal,
  • M. Maheswaran,
  • Murali Matcha,
  • D. Karthikeyan

摘要

Induction Motors (IM) are extensively deployed in industrial processes, but its high starting current necessitates the use of a reliable soft starting mechanism. However, soft starting increases the current ripples, which in turn is detrimental to the motor speed and lifespan. Therefore, an advanced control strategy using Vienna rectifier, which focuses on providing Power Factor (PF) unity, improved Power Quality (PQ), lower starting current, reduced harmonic distortion and precise speed control of IM, is presented in this work. Moreover, the approach uses Space Vector Pulse Width Modulation (SVPWM) for controlling Vienna rectifier to achieve excellent DC utilization and reduced harmonic distortion. The SVPWM also enables the Vienna rectifier to achieve high output voltage with low modulation index. An Artificial Flora Optimization (AFO) based Proportional Integral (PI) controller is implemented to fine-tune the speed control of IM and ensure a stable operation across varying load conditions. Additionally, Modified SVPWM, which combines the advantages of Discontinuous PWM and SVPWM, is also employed for the IM control as it addresses challenges like current distortion during zero-crossing and mid-point voltage imbalance. The appraisal is conducted with simulations using MATLAB and validation with a lab-scale prototype. The attained results accredit to the effectiveness of the proposed technique in providing superior motor control and compliance with industrial standards for energy efficiency.