中文摘要：

提出了一种T型三电平逆变器馈电双三相PMSM驱动系统直接转矩控制（DTC）策略。该系统既具有多相电机转矩脉动小、电流应力小和故障容错能力强的优点，也继承了T型三电平电机驱动谐波性能好、可靠性高的特点。该文所提出的基于双空间矢量调制（SVM）技术的直接转矩控制策略保留了DTC快速动态响应特性。与基于空间矢量解耦（VSD）的SVM技术相比，双SVM技术避免了复杂的矢量合成过程，并具有良好的谐波控制效果。所提出的控制策略还设计了谐波电流闭环控制器，能够有效抑制由绕组不对称、反电动势谐波、死区等非线性因素引起的低次谐波电流。通过实验验证了所提出的T型三电平逆变器馈电双三相PMSM驱动系统DTC策略的有效性。

英文摘要：

A direct torque control(DTC)strategy of T-type three-level inverter fed dualthree-phase PMSM drives is proposed and studied in this paper.This system possesses the advantagesof low torque pulsations,low current stress and strong fault tolerance from dual three-phase PMSM,while inheriting the characters of good harmonic performance and high reliability from T-typethree-level inverter.The double space vector modulation(SVM)technology based direct torque controlscheme proposed in this paper retains the fast dynamic performance of DTC.Compared to conventionalvector space decomposition(VSD)based SVM technology,the proposed double SVMs technology canachieve good harmonic suppression effect,while avoiding complicated process of voltage vectorsynthesis.A closed-loop harmonic current controller is also designed in the proposed strategy,whichcan suppress the low order harmonics caused by caused by motor asymmetry,EMF harmonic anddead-time effectively.The experimental result are given to verify the validity and feasibility of the DTCstrategy of T-type three-level inverter fed dual three-phase PMSM drives.