绕线转子无刷双馈电机的链型等效电路模型

Chain Equivalent Circuit Model of Wound-Rotor Brushless Doubly-Fed Machine

为了建立准确的无刷双馈电机等效电路和分析谐波对电机性能的影响,从该类电机的基本电磁关系出发,在其基波等效电路的基础上,提出谐波等效电路,建立考虑谐波影响后的链型等效电路模型,并给出该等效电路模型中参数的计算公式和状态方程。以一台实际的绕线转子无刷双馈电机为例,利用链型等效电路模型,对样机的机械特性进行计算,并和基波等效电路模型的计算结果、实验结果进行对比分析。样机的计算结果和实验结果对比表明,本文给出的等效电路模型和计算方法是正确的。

Building the accurate equivalent circuit model of the brushless doubly-fed machine （BDFM）and analyzing the harmonic effect on the performance of the machine is the purpose of this paper.Based on the basic electromagnetic relation and the fundamental equivalent circuit for BDFM, the harmonic equivalent circuit is presented and the chain equivalent circuit model of BDFM considering the effect of the harmonic content is built in this paper.The calculating formulas of the parameters and the state equation in the chain equivalent circuit model are given.As an example,the mechanical characteristic of a practical wound-rotor BDFM is calculated by the chain equivalent circuit model and compared with the calculated results of the fundamental equivalent circuit model and the measured results.The proposed equivalent circuit model and the calculation methods are valid by the comparison of the measured and calculated results of the prototype machine.