不对称电压跌落下考虑序分量的双馈风机故障穿越OA

Under the condition of asymmetrical grid voltage dips,the negative-sequence voltage component significant-ly impairs the stable operation of a doubly-fed induction generator(DFIG).In this paper,a negative-sequence compo-nent suppression method is proposed through the optimized control of a rotor-side converter(RSC)in the DFIG.First,to address the output phase deviation issue in the traditional phase-locked loop(PLL)under the condition of asymmet-ric voltage,a dual improved second-order generalized integrator is introduced into the conventional PLL structure to en-hance its phase-tracking accuracy,and the phase information is further utilized in the dual control of the RSC.Second,to mitigate the overcurrent problem in the RSC during asymmetrical voltage dips,a control method incorporating addi-tional positive-and negative-sequence virtual resistances on the rotor side is proposed,so as to enhance the fault ride-through capability of the DFIG under the condition of asymmetrical voltage dips and extend its fault ride-through range.Finally,a simulation model was developed on the MATLAB/Simulink platform,and experiments were conducted using the StarSim hardware-in-the-loop experimental platform to validate the effectiveness and feasibility of the proposed meth-od.