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本文在分析SPWM控制、矢量控制和传统直接转矩控制的基础之上提出了一种新型的直接转矩控制方法。其基本思想是由定子磁通给定值、电磁转矩给定值与由状态观测器估算出的定子磁通、电磁转矩实际值进行比较,其差值作为控制算法输入量。控制算法以维持定子磁通为恒值和电磁转矩跟随给定值为条件,决定定子电流大小和相位,进而决定一个预期工作电压矢量,这个预期工作电压矢量由相邻的逆变器6个工作矢量中的两个合成而得,并根据需要插入零矢量,在出现暂态时给出相应处理。由于对定子电流做到了实时控制,使转矩波动大为减小,响应速度得到提高。
In this paper, based on the analysis of SPWM control, vector control and traditional direct torque control, a new direct torque control method is proposed. The basic idea is that stator flux setpoint, electromagnetic torque setpoint and stator flux and electromagnetic torque estimated by state observer are compared with each other, and the difference is used as control algorithm input. The control algorithm determines the magnitude and phase of the stator current in order to maintain the stator flux constant and the electromagnetic torque follows a given value, and then determines an expected operating voltage vector. The expected operating voltage vector is determined by the number of adjacent inverters Two of the working vectors are synthesized and inserted into the zero vector as needed, giving the appropriate treatment when a transient occurs. Due to the real-time control of the stator current, torque ripple greatly reduced, the response speed is improved.