Rotor Position Angle Compensation Strategy of Induction Motor Drives for Field Orientation Deviation Correction

In rotor field orientation control (RFOC)-based induction motor (IM) drive system, parameter perturbations induce deviations in the rotor field orientation angle, critically impacting both dynamic and steady-state performance. To mitigate these effects, this paper proposes a compensation strategy for the rotor field orientation angle, leveraging a high-accuracy stator flux observer and a torque regulator. The stator flux observer is enhanced with an electromotive force (EMF) orthogonality-based phase correction mechanism to suppress integration drift and phase distortion inherent in conventional voltage-model observers. Furthermore, based on this accurate stator flux estimation, the electromagnetic torque in the stationary αβ-axis is computed, inherently eliminating dependence on rotor parameters and avoiding errors introduced by coordinate transformations. By comparing the αβ-frame torque with its counterpart in the rotating dq-frame, the torque regulator dynamically compensates for their deviation. The resulting control signal is utilized to modulate the slip frequency in real time, thereby correcting the rotor field orientation angle. Experimental results validate the efficacy of the proposed algorithm in improving orientation accuracy and overall system performance.