中文摘要：

针对某高速飞轮储能系统中的永磁无刷直流电机在宽速范围内运行时出现的电流和转矩脉动问题,开展了换向期间的转矩脉动的分析,建立了转矩脉动和转速之间的关系,提出了在低速区功率开关管采用先脉宽调制后恒通,最后再脉宽调制（PWM-on-PWM）的方法,在高速区功率开关管采用了带PWM的重叠换向调制的一种混合调制方法;在抑制换向期间的电流和转矩脉动的效果上对该调制方式进行了评价,并搭建了Matlab/Simulink仿真模型,进行了低速区的运行试验。研究结果表明,该混合控制方案能消除非换向期间非导通相上的续流现象,并可减小换向过程中的电磁转矩脉动,可以使无刷直流电机在相对较宽的速度范围内平稳运行。

英文摘要：

Aiming at reducing the current and the torque ripple appeared in flywheel energy storage system running in wide-range speed,after the analysis of torque ripple in the commutation interval,the relation between the torque ripple and the speed was established.A hybrid method was presented that the PWM-on-PWM was chosen to control power devices during low-speed range,while during high-speed range,the overlapping commutation with PWM was used.The control method were evaluated on the effect of reducing the current and the torque ripple during the commutation interval,the Matlab/Simulink model was built,and the running test in low-speed range were tested.The experimental results show that the proposed method can eliminate diodes′ free-wheeling phenomenon and reduce the torque ripple during the commutation interval,it adapts for brushless DC motor in wide speed-range.