Two-Degrees-of-Freedom PID Controller For AC/DC Converters

This paper proposes a two-degrees-of-freedom (2DOF) controller for direct power control's outer loop of a three-phase voltage source converter application. The presented scheme is based on voltage oriented (flux), which is realized on unity power factor (UPF) working and lower total harmonic distortion. Also, the 2DOF controller proposed is utilized in the outer loop owing to its high performance in set-point tracking and robustness to load changes. The proposed approach can be utilized in industrial plants in need of DC voltage alongside the advantage of UPF working. The time-domain performance of our proposal is analyzed carefully and the results are presented in Matlab/Simulink environment.