Design of one-degree and two-degrees of freedom controllers 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 (1FOC) of induction machine drive system. To achieve zero steady state error, minimum overshoot and minimum settling time, (good dynamic response for disturbance rejection and set point tracking), 1DOF and 2DOF controllers are designed and analyzed. The design of these controllers is developed based on the transfer function of the induction machine in the synchronous reference frame at field orientation control (FOC). The 1DOF controller is an integral plus proportional (IP) configuration while the 2DOF controller consists of proportional plus integral (PI) type in the feedback loop and lead/lag compensator in the feedforward loop. To verify the design of controllers and system performance, the drive system is simulated using SIMULINK for MATLAB. The desired current and speed tracking control performances of the drive can be preserved under wide operating range and good load regulating performance can also be obtained. The dynamic performance of the drive system for different operating conditions is studied with application of IP and 2DOF 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