无刷双馈电机等效电路及运行状态分析

Equivalent Circuit and Operation Analysis of BDFM

通过建立无刷双馈电机(BDFM)同步运行时的等效电路,将各电量分解为实部和虚部,推导了同步运行时的非线性数学方程,探讨了方程的求解方法。在等效电路的基础上,通过给定参数和输入条件,计算无刷双馈电机在控制绕组采用恒压频比控制方式下的输出转矩范围。仿真和实验结果证明,该等效电路能较好地反映无刷双馈电机同步运行时的运行状态,为分析计算提供了有效的工具,但是不能反映失步的问题,因此具有一定的局限性。

This paper presented the equivalent circuit of BDFM under the condition of synchronous operation, and deduced the nonlinear mathematical model basing on the equivalent circuit by decomposing voltage and current vector into real and imaginary parts. The solution method of the nonlinear mathematical model was also investigated in this paper. Given adequate parameters and input conditions, the equivalent circuit was used to estimate the scope of output torque whist the control windings is under the control of constant voltage and frequency ratio. The results show that the equivalent circuit is an effective tool to analysis the synchronous operation performance of BDFM, but it also has some limitations to predict the asynchronous operation performance.