Reactive-Power-Based Robust MTPA Control for v/f Scalar-Controlled Induction Motor Drives

This article proposes a new maximum torque per ampere (MTPA) control strategy for an induction motor (IM) controlled by the scalar (v/f) method. In scalar control, constant air-gap flux control is generally adopted for IM drives to provide the same torque capability in all operating ranges. However, this control method results in poor motor efficiency due to excessive stator current at light loads. This work proposes a new MTPA control method to minimize the stator current amplitude based on reactive power without measuring the rotor mechanical speed, resulting in improved system efficiency at light loads. In addition, this method proposes an online machine parameter compensation method. Thus, this proposed method is robust to parameter variations. Simulation and experimental results are provided to verify the performance of this MTPA control strategy.

Automated summary

This article introduces a new maximum torque per ampere control strategy for induction motors, aimed at improving system efficiency by minimizing stator current amplitude. The method does not require rotor mechanical speed measurement and is robust to parameter variations, also offering an online machine parameter compensation method.