滑模无速度传感器感应电机的简化预测转矩控制

Simplified Predictive Torque Control for Induction Motor with Sliding Mode Speed-Sensorless

针对感应电机的转矩和磁链控制,提出了一种新型的简化模型预测控制方法。通过引入新的转矩计算方案及多步多目标的模型预测控制策略,将转矩和磁链幅值的成本函数分开,不仅相对于传统的模型预测控制方法减少了计算负担,而且避免了权重因子的影响;同时通过引入滑模转速观测器,将预测模型中的实时转速替换为观测转速,实现了无速度传感器控制,避免了速度传感器带来的诸多不便。基于Matlab/Simulink给出了采用所提观测器及控制方法时电机的转速、转矩、电流等的仿真结果,并与传统磁场定向控制及直接转矩控制做了对比,仿真与对比结果验证了该控制方法的有效性。

A novel simplified predictive control method was proposed for the torque and flux control of induction motor.By introducing a new torque calculation scheme and a multi-step and multi-objective model predictive control strategy,the cost function of torque and flux amplitude was separated.Compared with the traditional model predictive control method,the new method not only reduces the calculation burden but also avoids the influence of weight factor.At the same time,the actual speed in the prediction model was replaced by the observed speed by introducing the sliding mode speed observer,which realizes the speed-sensorless control and avoids many inconve-niences brought by the speed sensor.Based on Matlab/Simulink,the simulation results for the speed,torque and current of the motor with the proposed observer and control method were obtained and compared with the traditional field oriented control and direct torque control.The simulation results and the comparison results both verified the effectiveness of the control method.