新型无速度传感器直接转矩控制系统

Novel Speed Senseless Direct Torque Control System

为了消除对于大多数观测器来说比较关键的转速反馈信息,磁链观测器的构建采用了双参考坐标系,即在静止坐标系下建立定子方程,在旋转坐标系下建立转子方程。由于该观测器不包含转速自适应量,消除了不准确的转速信息对磁链观测器的影响,提高了磁链观测器的精度和鲁棒性。运用MATLAB/Simulink仿真软件对无速度传感器直接转矩控制系统进行了仿真。仿真结果表明新型滑模观测器有效地提高了低速下定子磁链和转速的观测精度,并提高了系统的鲁棒性,拓宽了无速度传感器直接转矩控制系统的调速范围,最终保证了控制系统在全速范围内的高性能运行。

In order to eliminate the speed feedback information typical for most known observers, flux observer is structured by using two reference frames： the stationary frame for the stator equation, and the rotary frame for the rotor equation. The influence of inaccurate speed information on observers is eliminated due to the absence of the rotor speed adaptation in this observer, resulting in improving accuracy and increasing robustness of this flux observer. Speed senseless direct torque control system simulated respectively by using MATLAB/Simulink simulation software. Simulation results show that this novel sliding mode observer can improve the observation accuracy for the stator flux and speed at low speed and increase the system robustness effectively, resulting in widening the speed regulation range of the speed senseless direct torque control system and guaranteeing the high-performance control system operation in the whole speed range.