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

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