低速时直接转矩控制系统磁链观测器的改进研究  

Research on Improvement of Flux Observer of Direct Torque Control System at Low Speed

作　　者：侯程 邓福军[1] Hou Cheng;Deng Fujun

机构地区：[1]大连交通大学

出　　处：《变频器世界》2020年第4期48-51,共4页The World of Inverters

摘　　要：直接转矩控制与矢量控制相比,不需要矢量控制中复杂的解耦过程,直接对电机的磁链和转矩进行控制,通过计算转矩和定子磁链的偏差来确定电压矢量,实现对电机的控制。但是低速时,由于定子电阻压降的存在,定子磁链的观测有较大偏差,使得电机在低速运行时调速性能难以控制。因此,为改善其低速时的磁链观测性能,运用限幅和模糊控制器的相位角补偿的方法,达到直接转矩控制系统的低速磁链观测准确程度的目的,并通过仿真实验结果证实方法的有效性。Compared with vector control,direct torque control system does not need complex decoupling of the vector control,direct to control flux linkage and torque of the motor,by calculating the torque and stator flux linkage deviation to determine the voltage vector,the control system for the motor.But when low speed,due to the presence of stator resistance voltage drop,the observation of the stator flux linkage has larger deviation,make the motor at low speed run-time speed control performance is difficult to control.Therefore,it is to improve its performance,low speed performance of flux linkage and use limiter and phase Angle compensation method of fuzzy controller,to achieve direct torque control system of the purpose of flux observation accuracy at low speed,and through the simulation results verify the effectiveness of the method.

关 键 词：直接转矩控制 低速性能 磁链观测器 

分 类 号：TM301.2[电气工程—电机]