适用于缓解双馈感应发电机电磁转矩脉动的新型矢量控制

Novel Vector Control for Electromagnetic Torque Ripple Mitigation of Doubly-fed Induction Generator

针对电网电压谐波含量要求,提出一种基于矢量控制的定子电流谐波抑制拓扑结构,重点解决双馈异步发电机DFIG(doubly-fed induction generator)电磁转矩的脉动问题。所提控制器即谐波矢量控制HVC(harmonic vector control),能够抑制电流谐波。电网电压5、7、11、13次谐波分量,由于定子串联阻抗低,导致发电机电流谐波分量为同次,且相对振幅较高,因此,HVC已被测试用于此类电流谐波成分的控制,不需要谐波滤波器来估计定子电流的谐波含量。最后,经过仿真和实验分析,证明了所提控制的适用性和有效性。研究结果表明,该控制器的稳态误差接近于0,此外,HVC可作为DFIG中的谐波滤波器,并可根据应用要求选择谐波。

To meet the requirement of grid voltage hannonic content,a topological structure of stator current harmonic suppression based on vector control is proposed,focusing on the electromagnetic torque ripple of doubly-fed induction generator(DFIG).The proposed controller,i.e.,hannonic vector control(HVC),can suppress current harmonics.Due to the low stator series impedance,the 5th-,7th-,11th-,and 13th-order harmonic components of grid voltage will cause the harmonic components of generator current to be of the same order,and the relative amplitude is high.Therefore,HVC has been tested for the control of this kind of current hannonic components.The proposed control does not require any hannonic filter to estimate the harmonic content of stator current.Finally,the applicability and effectiveness of the proposed control are proved by simulation and experimental analyses.Results show that the steady-state error of the proposed controller is close to zero.In addition,HVC can be used as a hannonic filter in DFIG,and the harmonics can be selected according to the application requirements.