Current Loop Design for High-Speed Dual Three-Phase Generator Grid-Connected Control System

A current loop design scheme for a high-speed dual three-phase generator grid-connected control system is studied. The system adopts a back-to-back dual pulse width modulation converter to achieve the power transmission. The two-degree-of-freedom (2-DOF) proportional integral (PI) regulator is used to control the machine side current loop, and the improvement effect of the 2-DOF PI regulator on decoupling control with inaccurate parameters is analyzed by the closed-loop root locus. The complex-vector PI regulator is used to control the grid side current loop, and the complex-vector PI transfer function model is derived to reveal the essence of its weakening the sensitivity to decoupling parameters. The simulation model is built to verify the correctness and effectiveness of the proposed scheme. The simulation results show that the designed regulators enhance the robustness of the current loop to decoupling parameters and improve the system stability.