主从绕组电机驱动系统及控制策略研究

Principle and Control Strategy for Master-Slave Windings Motor Drive System

针对大功率电机驱动系统工作在低载波比下引起的转矩脉动问题,该文提出一种基于双定子绕组结构的主从绕组电机驱动系统。利用向从绕组中注入高频谐波电流形成补偿磁链,再与低载波比工况下的主绕组磁链线性组合,保证圆形组合磁链,找到解决低载波比驱动系统中的转矩脉动问题的新途径。首先,阐述电机中主从绕组的磁链组合与转矩补偿原理,并给出主从绕组的设计指标;其次,针对从绕组侧高频谐波电流注入方式、控制策略等问题进行详细分析;最后,仿真与实验均表明该文提出的主从绕组系统及其控制策略的有效性。通过变换器开关损耗与导通损耗的计算与比较,结果表明,实现相同转矩脉动指标,主从绕组系统损耗可以降低30%左右,明显优于现有高载波比三相系统。

To solve the torque ripple caused by the low carrier ratio limitation in high-power motor drive systems,a master-slave motor drive system based on the double stator winding structure is proposed in this paper.The high frequency harmonic current is injected through the auxiliary winding to compensate the torque ripple caused by the low carrier ratio.The basic operation principle in master-slave motor drive system and the design of master-slave windings are presented.The low frequency torque ripple and high frequency compensation are analyzed in detail.The loss of the master-slave winding system is better than that of the three-phase system with high carrier ratio when the same torque ripple is ensured.Simulations and experiments show the effectiveness of the proposed master-slave winding system and the control strategy.The loss calculation under the same torque ripple shows that the loss can be reduced by 30%,compared with conventional system with high carrier ratio.