基于混合滑模控制器和反正切观测器的SPMSM直接转矩控制

针对基于传统PI控制的表贴式永磁同步电机(SPMSM)直接转矩控制系统抖振和相位延迟等问题,在转速环节设计新型趋近律,采用模糊自适应方法,实现趋近律参数的动态调节,并通过Lyapunov方法证明稳定性.利用super-twisting滑模策略生成参考电压矢量,完成混合滑模控制器的设计,建立基于反正切函数的滑模观测器,并对转子位置进行合理补偿.仿真实验表明,与PI控制、基于指数趋近律的滑模控制器相比,所设计的控制器在电机空载起动和外加干扰情况下均能有效提高系统响应,显著降低抖振,与其他模型参考自适应观测器相比,所设计观测器能有效减小相位延迟,转子位置辨识结果更准确.

Direct torque control of SPMSM based on hybrid sliding mode controller and arctangent observer

To solve the problems of chattering and phase delay of a surface permanent magnet synchronous motor (SPMSM) direct torque control system based on traditional PI control, a new approach law is designed in the speed link, and the fuzzy adaptive method is adopted to realize the dynamic adjustment of the approach law parameters. The Lyapunov method is utilized to prove its stability. The super-twisting sliding mode strategy is utilized to control reference voltage vector, the hybrid sliding mode controller is designed, and a sliding mode observer based on the arctangent function is established and the rotor position is reasonably compensated. The simulation experiments show that compared with PI control, and the sliding mode controller based on the exponential reaching law, the proposed controller can effectively improve the system response and significantly reduce the chattering and the phase delay, when the motor is started without the load or with the external disturbance. And the proposed observer can effectively reduce the phase delay and improve the rotor position identification result compared with other model reference adaptive observer.