改进的异步电机全速域直接转矩滑模控制仿真研究  

Research on Improved Direct Torque Sliding Mode Control of Asynchronous Motor in Full Speed Domain

作　　者：张曹辉 Zhang Caohui(Xi’an Railway Vocational and Technical Institute,Xi’an,Shaanxi 710026,China)

机构地区：[1]西安铁路职业技术学院,陕西西安710026

出　　处：《西安轨道交通职业教育研究》2023年第1期28-30,34,共4页Xi'an Rail Transit Vocational Education Research

摘　　要：针对传统牵引异步电机直接转矩控制系统存在转矩脉动大、开关频率不固定以及定子磁链观测器准确度对控制性能有较大的影响等问题。设计了一种新型的滑模控制器,并与空间矢量脉宽调制技术相结合,保证系统在交流调速过程中转矩和磁链能够快速且准确地达到期望值。仿真结果表明:该控制策略满足牵引电机在全速域范围内实现电磁转矩的平稳调节,同时在一定程度上降低了转矩谐波含量,保证了电机运行性能的稳定性。The traditional direct torque control system of traction asynchronous motor has some problems,such as large torque ripple,unfixed switching frequency,and the accuracy of stator flux observer,which have a great impact on the control performance.A new type of sliding mode controller is designed,which is combined with space vector pulse width modulation technology to ensure that the torque and flux linkage of the system can reach the expected value quickly and accurately in the process of AC speed regulation.The simulation results show that the control strategy meets the requirements of smooth adjustment of electromagnetic torque of traction motor in the full speed domain,and reduces the harmonic content of torque to a certain extent,ensuring the stability of motor operation performance.

关 键 词：异步电机 直接转矩控制 滑模控制 空间矢量脉宽调制技术 交流调速 磁链 电磁转矩 转矩谐波 

分 类 号：TM343[电气工程—电机]