基于NESO的永磁同步电机无位置传感器控制

由于使用高分辨率的机械传感器会增加永磁同步电机(PMSM)的体积和成本,降低系统的可靠性,因此在电机控制领域引入了无位置传感器控制技术。根据扩张状态观测器的理论,设计了非线性扩张状态观测器(NESO)来观测PMSM的反电动势,实现对电机转子速度和位置的估计,并通过分区分析和Lyapunov理论分析了观测器的收敛性。最后,通过对观测器的仿真实验,验证了NESO能够对系统的转速和位置实现较好的跟踪,并且具有很好的鲁棒性。     

永磁同步电机自抗扰控制调速系统

在永磁同步电机(PMSM)调速系统中,提出采用自抗扰控制(ADRC)设计PMSM调速系统速度环,针对调速系统控制特性和ADRC策略特点,改进ADRC中的扩张状态观测器。同时,采用非线性扩张状态观测器(NESO)观测系统负载转矩并进行前馈补偿,以降低系统负载转矩扰动影响。综合以上两点改进措施,设计出速度环改进型自抗扰控制器(IADRC)。通过仿真和试验验证了IADRC在PMSM调速系统中的有效性。     

An improved nonlinear extended state observer with adaptive variable gain

This paper proposes an improved nonlinear extended observer with adaptive gain (ANESO), which can be applied to systems with large disturbance amplitude changes without parameter re-tuning. An ANESO is added an adaptive factor $A_i$ to the gain of the original NESO. The expression of $A_i$ is obtained by assuming that nonlinear extended states observer (NESO) and linear extended states observer (LESO) has the same characteristic of steady-state error when the amplitude of disturbance turns. On this basis, an adaptive adjustment algorithm based on tracking error is designed. In addition, the stability of the proposed ANESO is analyzed by using the Routh-Hurwitz criterion. Finally, through simulation experiments, the observation performance of ANESO was compared with NESO and switching extended state observer (SESO). The experimental results demonstrate that the observation performance of ANESO is hardly affected by the disturbance amplitude, and moreover, its observation precision is higher than that of NESO and SESO.