摘要：针对基于标准扩展卡尔曼滤波器(EKF)的永磁同步电机(PMSM)无位置传感器矢量控制技术只适用于中高速阶段而在低速阶段转子位置和转速估计困难,以及标准EKF算法在较强非线性系统中估计精度较低的缺陷，提出了一种复合式的PMSM无位置控制系统。低速段采用流频比（I/f）起动的方法，该方法不需要转子初始位置估计和电机参数估计，起动电流可控，适用于PMSM无位置传感器控制的起动。对电机中高速状态采用结合多新息法改进的EKF无位置估测控制，扩展利用之前两个时刻新息，增强非线性系统中的估计精度。最后通过仿真对该控制方案进行验证，验证结果证明了该方案使得系统抗干扰性更强，控制精度更高，更适用于PMSM全速范围控制的应用。
关键词：永磁同步电机；无传感器控制；流频比起动；扩展卡尔曼滤波器；多新息

Abstract: A hybrid sensorless control system for the permanent synchronous motor （PMSM）was proposed due to the following two aspects. Firstly, the sensorless field oriented control of PMSM on the basis of normal extended kalman filter(EKF) only applies to the mediumhigh speed stage while itis difficult to estimate rotor position and speed at lowspeed stage. Besides, normal EKF lacks the accuracy of estimation in strong nonlinear system. At lowspeed stage, this hybrid sensorless control system uses I/f startup method, which does not need initial rotor position estimation and machine parameters estimation and by which the starting current is controllable. Thus, this method is suitable to start the permanent synchronous motor(PMSM).While at mediumhigh speed stage,this hybrid sensorless control system usded the improved EKF method by combining multiinnovation sensorless estimation control. It made full use of the previous two times information to improve the estimation accuracy of the nonlinear system. Finally,by simulation the control strategy was validated.The verification results prove that the strategy makes the system has a better antiinterference performance with better control precision and is more suitable for the application of full speed range PMSM control.
Key words:  permanent synchronous motor;sensorless control; I/f startup;extended kalman filter(EKF);multiinnovation