一种消除双馈电机转矩脉动的磁场重构方法

A Field Reconstruction Method for Elimination of Torque Ripple in Doubly Fed Induction Generators

电网电压不平衡和电网电压谐波会恶化风力发电中双馈电机(Doubly Fed Induction Generator,DFIG)的性能,并且在电机中引入转矩脉动。本文从电磁场的角度,提出了一种双馈电机内部磁场重构方法(Field Reconstruction Method,FRM),通过对转子电流的优化选择来减轻转矩脉动。文章首先阐述了转矩脉动的危害及传统解决办法,分析了电压不平衡和电压谐波对DFIG性能造成影响的机理,最后提出了实现转子电流优化的流程。

System unbalance and system harmonics will deteriorate the performance of doubly fed induction generator（DFIG） in wind power by introducing unwanted torque harmonics.From the electromagnetic point of view,the paper presents a novel field reconstruction method which can actively mitigate the undesirable torque ripple by choosing the optimized rotor current.First,this paper describes the disadvantage of the torque ripple,and the traditional solutions to the problem.The mechanism of effects of voltage unbalance and system harmonics on the performance of DFIG is analyzed.The paper focuses on the principle of the magnetic field reconstruction method.The optimization process of the rotor current is proposed finally.