Microgrid Restraining Strategy Based on Improved DC Grid Connected DFIG Torque Ripple

[摘要] Aiming to the voltage of the stator side is generated by the modulation of the SSC in the improved topology, especially under the circumstance with the asymmTeric fault of stator side, DFIG's electromagnTeic torque, amplifies ripple of grid-connected power for the grid side. The novel control mTehod suitable to stator side converter and rotor side converter based on reduced-order resonant controller (RORC) is proposed in this thesis, DFIG's torque and output power performance are improved. Under the RORC control conditions the transfer functions of stator current and torque control system are established, the amplitude characteristic and the system stability of RORC control are analysed. The simulation results in Matlab/Simulink verify the correctness and validity of the proposed mTehod.

[发布机构] State Grid Liaoyang Electric Power Supply Company, Liaoyang; 111000, China^1;Kunming Institute of Physics, Kunming; 650223, China^2

[效力级别] 电工学

[关键词] Amplitude characteristics;Grid-connected;MATLAB /simulink;Reduced order;Resonant controller;Rotor-side converter;Stator currents;Torque ripples