摘要
对一种基于改进滑模观测器的永磁同步电机SVM-DTC(Direct Torque Control)系统进行了设计研究。针对传统直接转矩控制转矩与磁链脉动较大的问题,采用生成预期电压矢量的SVM-DTC控制方式抑制转矩与磁链脉动;同时,利用Sigmoid函数实现滑模速度观测器的准滑动模态控制,改进了传统滑模观测器的不足,实现了SVM-DTC系统的无位置传感器控制。仿真结果表明,能够有效抑制转矩与磁链脉动,并能实现良好的转速观测效果。
An SVM-DTC system for PMSM based on an improved sliding-mode observer is designed. SVM-DTC control method is adopted in the system to generate an expected voltage vector for the purpose of restraining the ripple of torque and flux linkage existing in conventional direct torque control. On the other hand, the Sigmoid function is used for quasi-sliding mode control over the sliding- mode speed observer, thus improving the conventional sliding-mode observer and realizing position-sensorless control in the SVM-DTC system. Simulation results have shown that this system can restrain the ripple of torque and flux linkage effectively and realize excellent speed observation.
出处
《电气自动化》
2015年第1期4-6,30,共4页
Electrical Automation
