基于MRAS无速度传感器的PMSM直接转矩控制

Direct torque control of speed sensorless permanent magnet synchronous motor based on MARS

对混合动力车用永磁同步电机最大转矩电流比的直接转矩控制系统进行分析。采用无功功率作为速度估算模型的模型参考自适应的方法,建立永磁同步电机最大转矩电流比无速度传感器直接转矩控制的系统模型。利用稳态的无功功率与瞬态的无功功率的差值作为误差信号,通过对误差信号设计合适的自适应律实时调节得到估算转速,根据超稳定性理论来保证整个系统的稳定性,并对该方案进行仿真验证。研究结果表明:在不同转速下,采用无功功率的无速度传感器模型估算的转速能有效地跟随实际速度,且整个系统具有良好的动、静态运行性能。

The direct torque control system of the maximum ratio of torque to current for PMSM (permanent magnet synchronous motor) was analyzed, which was used in hybrid electric vehicle. The system model of sensorless control for PMSM of the maximum ratio of torque to current was established based on the model of reference adaptive system using the reactive power as a speed estimation model. The error of the instantaneous and steady-state reactive power was utilized to design appropriate adaptive law, and the adaptive law was adjusted to estimate the speed. The system stability was ensured by Popov super-stability theory, and simulation was carried out at different speeds. The results show that the proposed method can effectively estimate the actual speed and the system has good dynamic and statistic performance.