一种新型的改善直接转矩控制低速性能的磁链观测方法  

Novel Method of Stator Flux Estimating to Improve Direct Torque Control Low Speed Performance

作　　者：蔡斌军[1] 刘国荣[1] 

机构地区：[1]湖南工程学院

出　　处：《电气传动》2007年第4期21-25,共5页Electric Drive

基　　金：湖南省自然科学基金项目(05JJ40093)

摘　　要：直接转矩控制是继矢量控制后的一种新型的控制方法,而此方法的调速性能取决于高效稳定的定子磁链。由于定子电阻压降的存在使得电机运行在低速区时难以控制。因此,提出了一种新型的改善直接转矩控制系统低速性能的磁链观测方法。该方法采用低通滤波器代替纯积分环节,并提出对磁链幅值进行闭环反馈补偿和用模糊控制器补偿引入低通滤波器造成的磁链角的误差。仿真结果表明,采用此控制方法,直接转矩控制系统的低速性能有十分明显的提高,仿真结果证实了该方法的有效性。Direct torque control is a novel control method after vector control. Speed control of this method depends on effectively establishing the stator flux. However, it becomes difficult when the motor operates in the low-speed region, because the voltage drop on stator resistance is comparable with the input stator voltage. Therefore, a novel compensation method of stator flux estimating to improve direct torque control low speed performance was proposed. Using low-pass filter to replace the integrator, compensates the value of the flux with closed-loop feed-back and compensates the subsequent error of angle with fuzzy controller. The simulation results show that this method improves direct torque control system performance of low-speed, Simulation resuits confirm the validity of this method.

关 键 词：直接转矩控制 磁链观测 低通滤波 低速性能 

分 类 号：TM343[电气工程—电机]