کنفرانس بین المللی ماشین و محرکه های الکتریکی

صفحه اصلی / The 5th International Conference on Electrical Machines and Drives

Mitigation of low-frequency oscillations at light loads in inverter-fed induction motors under constant V/f control

نویسندگان :

Mohammad Khalilzadeh¹ Pooya Ghani² Hamidreza Hafezi³

1- دانشگاه تربیت مدرس 2- شرکت مهندسی و ساخت برق و کنترل مپنا (مکو) 3- شرکت مهندسی و ساخت برق و کنترل مپنا (مکو)

کلمات کلیدی :

Induction motor drive،proportional-resonant controller،low-speed instability،V/f control،torque oscillations

چکیده :

Induction motors in the mid- and high-power range are widely deployed across industrial sectors due to their robustness, efficiency, and cost-effectiveness. To enable variable-speed operation, these motors are typically paired with a drive system. However, a well-known challenge arises when operating inverter-fed induction motors under the constant volts-per-hertz control method in light-load and low-speed conditions: the system may exhibit sustained torque oscillations, which in severe cases can induce speed fluctuations and escalate into unstable behavior. This paper investigates the phenomenon mathematically and proposes a novel damping strategy based on a non-ideal proportional resonant controller. A simulation study conducted in MATLAB Simulink is used to verify the effectiveness of the proposed method. The results show a significant improvement in mitigating sustained low-frequency torque oscillations compared to conventional constant volts-per-hertz control.