【摘要】 传统双闭环PI控制通过正负序分解来消除电网电压不平衡状态下双馈风力发电机内的磁场倍频分量,控制较为复杂。在分析不平衡电压下双馈发电机运行特性的基础上,针对转子电流中的二倍频分量,提出了一种基于比例-积分-谐振(PIR)控制器的矢量控制策略,可以有效地抑制二倍频分量,从而节省了负序控制器,使控制器设计简单。同时,使用Matlab/Simulink对上述控制策略进行仿真验证,仿真结果表明了所提策略可以提高DFIG在电网电压不平衡条件下的稳定性。更多还原

【Abstract】 In order to eliminate the frequency multiplications in doubly-fed wind power induction generator(DFIG)magnetic field under the unbalanced grid voltage,traditional double closed loop proportional integral(PI)needs the positive and negative sequence decomposition,so it is one of more complex control.Based on analysis of the operation features of DFIG in the unbalanced grid voltage,in allusion to double frequency components of rotor,it is proposed that a vector control strategy based on proportional-integral-resonant controller(PIR),which can restrain double frequency components,thus leave out the negative sequence controller,so the controller design is simple.In the meantime,the proposed strategy is verified in Matlab/Simulink and the simulation results demonstrate that control strategy with PIR controller can improve the DFIG stability in the unbalanced grid voltage.更多还原