永磁同步电机直接转矩控制系统控制策略比较

Comparison of Control Strategies of Permanent Magnet Synchronous Motor Direct Torque Control System

为了抑制因开关表失效引起的转矩脉动,本文研究了电压矢量对永磁同步电机直接转矩控制系统的影响,得到了定子磁链幅值、转矩角和转矩的控制规律,并由此给出了永磁同步电机直接转矩控制系统电压矢量选择区域。本文提出了一种基于定子和转子磁链位置信息及空间矢量调制技术的电压矢量选择策略。仿真结果表明:与开关表相比,本文提出的电压矢量选择策略可始终满足系统对转矩的控制要求,从根本上消除因开关表失效引起的不合理转矩脉动,控制效果良好。

In order to decrease torque ripple caused by switching table, effects of the applied voltage vector on the permanent magnet synchronous motor （PMSM） direct torque control （DTC） system were studied. Control principles of the amplitude of stator flux, torque angle and torque were proposed and voltage vector selection area of PMSM DTC system was given. This paper proposed a voltage vector selection strategy based on stator flux and rotor flux position information and the technology of space vector modulation. Simulation results show： compared with switching table, voltage vector selection strategy proposed in this paper can always satisfy the control of torque and suppress unreasonable torque ripple.