一种简化的异步电机无权值直接转矩预测控制

A simplified finite-state predictive direct torque control for induction motor drive without weighting factors

针对传统的异步电机直接转矩预测控制需要在所有可能的电压矢量中求取目标函数的最小值,随着电压矢量和控制目标的增加,其计算负担会增大,而且目标函数中权值的在线求解也会增加计算的复杂度,而根据经验的权值求解给调试带来很大的困难等情况,文中提出了一种结合开关表的直接转矩预测控制手段,通过开关表优先筛选开关矢量,以减小目标函数的计算次数。同时分解目标函数并根据排序法求得目标函数的最小值,从而省去权值的求解。结果表明,这种方法在不影响系统控制性能的基础上不仅极大地减小了程序执行时间,而且降低了系统的调试难度,并且能推广应用在多电平逆变器的控制平台上。

For the conventional finite-state predictive torque control（ FS-PTC）,the minimum value of the objective function needs to be obtained in all possible voltage vectors（ VVs）. As the VVs and the objectives increase,the computational burden increases. Moreover,the online solution of the weights in the objective function will also increase the computational complexity while tuning factors by experience is very difficult. A direct torque predictive control method combined with a switch table is proposed. The new switching table assists to select VVs and reduce amount of calculations.The proposed method use a multi-objective optimization through a ranking approach to replace the single cost function unnecessary for calculation of factors. The results show that the program execution time is cut down greatly while the debugging difficulty of the system is reduced. The method can be applied to the control platform of multi-level inverters without affecting the control performance of the system.