Design and implementation of 2DOF I-PD controller for indirect field orientation control induction machine drive system

This paper presents analysis, design and simulation of one degree-of-freedom (1DOF) and two-degrees-of-freedom (2DOF) controllers for the indirect field orientation control (IFOC) of induction machine drive system. To achieve good dynamic performance for disturbance rejection and set point tracking, 1DOF and 2DOF controllers are designed and analyzed. The proposed controllers are designed based on the transfer function of the induction machine in the synchronous reference frame at field orientation control (FOC). The 1DOF controllers are proportional plus integral plus derivative (PID) and integral plus proportional & rate feedback (I-PD) configuration while the proposed 2DOF controllers consist of a PID type in the feedback loop and a command feedforward controller and the other I-PD type in the feedback loop and also a command feedforward controller. The dynamic performance of the drive system for different operating conditions is studied with application of 1DOF PID, 1DOF I-PD, 2DOF PID and 2DOF I-PD controllers. Taking into consideration the parameter variations of the induction machine, the dynamic performance have been studied under load changes and set-point variations. The simulation results are provided to demonstrate the effectiveness of the proposed controllers.