A Simple and Efficient Design of 2DOF Controllers with Application to the Speed Regulation of Electrical Motors

• Published in: 2023 IEEE 8th Southern Power Electronics Conference and 17th Brazilian Power Electronics Conference (SPEC/COBEP) pp. 1 - 6
• Main Authors: Borin, Lucas C., Viaro, Robert U. M., Mattos, Everson, Montagner, Vinicius F.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 26.11.2023
• Subjects: 2DOF control; Feedforward systems; Mathematical models; Permanent magnet motors; permanent magnet synchronous motor; PI control; Regulation; speed regulation; Synchronous motors; Transfer functions
• DOI: 10.1109/SPEC56436.2023.10407709

This paper proposes a design procedure for a two degree of freedom (2DOF) controller applied to first order plants. The feedforward controller is comprised here by a simple proportional gain, and the feedback action is provided by a proportional-integral controller. The proposed design procedure provides the control gains that allow to the closed-loop system a first order transfer function response, demanding from the control designer the choice of only one parameter: the frequency, p, of the closed-loop pole. The limit for the control signal, \bar{U} , is also taken into account in the 2DOF design, allowing operation without control signal saturation. The proposed 2DOF controller is applied to the speed regulation and current regulation of a permanent magnet synchronous motor. For a comparison, a conventional proportional-integral controller (without the feedforward action) is obtained by a specialized function in MATLAB, and the results show the superiority of the 2DOF controller, which guarantees operations without overshoot and without control signal saturation.