异步电机无速度传感器控制系统研究

Research on Speed Sensorless Control System of Asynchronous Motor

提出了一种以异步电机本身为参考模型的新型龙贝格观测器来实现转速估算和参数辨识。在传统龙贝格观测器的基础之上,将龙贝格观测器极点的实部向左平移常数a(a>0),虚部不变,并简化其中增益矩阵使其不含转速估计值。这样不仅提高转速辨识的精度;而且可以减小电机参数变化对系统的影响,提高了系统的鲁棒性。仿真结果表明,改进后系统能够更快速跟踪转速,具有良好的抗负载干扰能力、参数变化的鲁棒性和低速性能,并且能够准确辨识定子电阻。

A new Luenberger observer based on asynchronous motor as a reference model is proposed to realize the rotor speed estimation and parameter identification.Based on the traditional Luenberger observer,the pole real part of the novel Luenberger observer is translated to the left by a constant distance a(a>0)and the imaginary part remains unchanged.Then the gain matrix is simplified,which does not contain the estimated speed.Speed identification accuracy and robustness are improved.Simulation results demonstrate that the speed estimation is quick and good at load variation,the robustness of parameter changes and low speed performance,at the same time stator resistance is accurately identified.