基于转差频率旋转坐标系的无刷双馈电机数学模型

由于无刷双馈电机功率绕组和控制绕组极数不同,两套绕组电流在电机气隙内产生的旋转磁场的转速不同,使得人们在建立无刷双馈电机数学模型时,通常建立两个旋转坐标系.为解决此问题,本文提出一种基于转差频率旋转坐标系的建模方法,将本是固定的控制绕组建立在以特定速度旋转的坐标系上,这种方法可以将无刷双馈电机数学模型建立在一个旋转的坐标系上.这种建模方法,解决了原来数学模型建立过程复杂,难以理解的问题,并为建立类似传统异步电机的矢量控制方法奠定了基础.

Physical model and mathematical model of doubly-fed brushless machine based on slip frequency rotary coordinate system

For the pole numbers of power windings and control windings are different,rotary speeds of magnetic field generated by current of two windings in air gap are different.So people generally establish complex rotary coordinate system when they set up mathematic model of doubly-fed brushless machine(DFBM).In order to solve this problem,a model building method based on slip frequency rotary coordinate system is presented in this paper,and original fixed vectors of control windings are established on rotary coordinate that rotates at a specific speed.Thus,mathematic model of DFBM is based on a rotary dq coordinate system.That solves the problem that procedure of building model is complicated and difficult to comprehend.