用于驱动无刷直流电机的矩阵变换器闭环调制

Closed-loop Modulation Method for Matrix Converter Driving Brushless DC Motor

给出一种矩阵变换器驱动无刷直流电机实现交交变频调速的控制策略。兼顾系统输入输出性能,将空间矢量调制和传统电压源型逆变器驱动无刷直流电机调制策略相结合,构成矩阵变换器控制无刷直流电机的新型调制方法。基于此调制方法,提出矩阵变换器驱动无刷直流电机交交变频调速的闭环控制策略。以调制比为中间变量,通过对调制比的修正及时调整变换器的输出电压,实现转速的准确跟踪。实验验证了所提控制策略的有效性。

A method using a matrix converter to drive a brushless DC motor （BLDCM） based on indirect modulation model was presented. Combining the space vector modulation and the modulation strategy of traditional voltage source inverter driving brushless DC motor, the new method was deduced. Then the closed-loop control strategy of the adjustable speed system was proposed. A modulation index was defined as intermediate variables. Through the amendment of the modulation index timely, the regulation of output voltage can be realized. And the adjustable speed was implemented. The validity and the feasibility of the control strategy are verified by experiments.