低速PMSM无速度传感器调速系统积分滑模控制

针对低速条件下定子电阻的变化会影响永磁同步电动机矢量控制系统的实际速度辨识问题,基于模型参考自适应控制策略(MRAS)设计速度和定子电阻同时辨识的自适应观测器.以测量的定子电压为输入变量,电机的定子电流为状态变量,基于波波夫超稳定性理论确定速度和定子电阻自适应律,采用带有积分滑模面的滑模变结构速度控制器,实现给定速度以指数趋近率无静差跟踪,通过Lyapunov定理证明所设计的速度控制器在电机参数变化和外部负载扰动情况下都具有稳定性.理论分析和仿真结果验证了所设计的无速度传感器矢量调速系统具有良好的低速性能.

Sensorless of integral sliding mode controlled PMSM at low speeds

As the variation of stator resistance may influence the speed estimation and tracking control of reference speed for the sensorless of permanent magnet synchronous motor(PMSM),so based on model reference adaptive strategy(MRAS),an observer is constructed,which provides the rotor speed and stator resistance estimation on the basis of the measured stator voltages and currents.The speed and stator resistance adaptive law was defined by Popov’s hyperstability.And also a sliding-mode controller with an integral switching surface was designed,which was employed for speed tracking of the drive system.The closed-loop stability of the proposed controller was proved under parameter uncertainties and load disturbances using the Lyapunov stability theory.Theoretical analysis and simulation results have verified the feasibility and effectiveness of the proposed method at low speeds.