异步电机DTC系统脉动最小化研究

直接转矩控制具有控制简单、动态响应迅速、对参数变化鲁棒性强的特点,因此得到了广泛的应用。在传统的异步电动机直接转矩控制系统中,存在电压空间矢量对定子磁链幅值和磁通角的影响,特别是低速时系统脉动大。针对此问题,文章提出了一种的新的控制方法,该方法将磁链区间细分控制与电压矢量合成结合在一起,并通过引入模糊控制算法进一步提高了转矩响应时间,且减小了转矩脉动。仿真结果表明,本控制方法可以大大减小转矩脉动,具有较好的动静态性能。

Study of Torque Ripple Minimization for Direct Torque Control of Asynchronous Motors

Direct torque control has been applied widely due to its simple arithmetic, fast transient response and robust stability to parameter changed. As for the conventional direct torque control system for asynchronous motors, there is the effect of voltage space vector on the magnitude of stator flux and flux angle, especially there are large ripples at low speed. Aiming at this issue and based on conventional DTC, a new control strategy is proposed in this paper, this strategy combines flux linkage section subdivision control with synthesizing vectors and can improve the torque response time by introducing Fussy control algorithm, thereby reducing torque ripples effectively. Simulation results show that the strategy can greatly reduce the torque ripples and has a better dynamic and steady performance.