基于扩展卡尔曼滤波的船舶电力推进系统仿真

摘要

针对船舶电力推进系统中采用传统直接转矩控制存在磁链和转矩脉动较大,以及速度传感器的使用降低了系统可靠性,增加了系统成本等问题.提出采用扩展卡尔曼滤波器精确估计电机的定子磁链和电机转速,间接估计转矩,从而实现永磁同步电机的无速度传感器直接转矩控制.保持了直接转矩控制的转矩快速响应和系统鲁棒性强的优点,降低磁链和转矩脉动,减小了系统因电机参数的变化和负载扰动带来的影响.仿真结果表明,基于扩展卡尔曼滤波的船舶电力推进系统具有良好的转速和转矩控制性能.%Ship electrical propulsion systems suffer from big ripples of flux linkage and torque when using traditional direct torque control. Besides, those systems have the problems of lower reliability and higher costs due to the speed sensor. The direct torque control of permanent magnet synchronous motors without speed sensor is achieved through precisely estimating the stator flux linkage and rotor speed, and indirectly, the torque by means of the extended Kalman filter. Retaining the advantages of direct torque control method in rapid torque response and strong robustness, the system has significantly reduced ripples of flux linkage and torque. Besides, the effects of motor parameter variations and load disturbance are reduced, too. Simulation results show that this ship electrical propulsion system based on extended Kalman filter has good performances of control for rotor speed and torque.