基于MRAS的无直流母线电压传感器PMSM滑模控制

摘要

针对永磁同步电机直流母线电压传感器故障的问题，提出一种无直流母线电压传感器的永磁同步电机滑模控制策略。设计了基于自适应技术的模型参考自适应观测器，以精确估计直流母线电压值，从而保证电机正常运行，利用滑模控制技术，设计了积分滑模面，以保证电机转速、直轴、交轴电流能够快速收敛到给定值。同时采用连续幂次函数设计滑模控制律，消除了滑模抖振。仿真结果表明，所设计的直流母线电压观测器能够精确观测直流母线电压值，当直流母线电压传感器故障时亦能够保证系统的正常运行，且滑模控制器能够使转速、电流更快的跟随给定值，使系统具有更强的鲁棒性。%In view of the fault of DC bus voltage sensor of the permanent magnet synchronous mo-tor (PMSM),the sliding mode control strategy of PMSM for DC bus voltage sensor is proposed. A model reference adaptive observer is designed to exactly estimate DC bus voltage and to ensure the normal operation of the motor with adaptive techniques.By making use of the sliding mode control techniques,an integral sliding surface is designed to ensure that the motor speed,direct-axis and quadrature-axis current can quickly converge to the given value.At the same time,the control law is designed by using the continuous power function to eliminate the chattering of slid-ing mode.The simulation results show that the designed DC bus voltage observer can accurately observe DC bus voltage value to guarantee the normal operation of the system when DC bus volt-age sensor is fault.The sliding mode controller can make the rotating speed and current follow the given value faster,and make the system more robust.