基于PSO的永磁同步电机分数阶滑模控制器设计

针对永磁同步电机提出了一种分数阶滑模控制器,将整数阶滑模流形面推广到分数阶滑模流形面,根据永磁同步电机的数学模型建立控制器的输出模型,采用Lyapunov理论来验证分数阶滑模控制器的稳定性。采用PSO智能算法对分数阶滑模控制器的参数进行寻优,然后在Matlab/Simulink平台上搭建模型,对所提出的分数阶滑模控制器进行仿真分析,其结果显示,分数阶滑模控制器比整数阶滑模控制器具有更好的抗扰动能力和误差精度。

基于改进分数阶滑模控制的PMSM直接转矩控制

基于滑模变结构的永磁同步电动机直接转矩控制技术,具有控制结构简单、响应速度快、鲁棒性强等优点,是一种高性能的变频调速控制方法。为此,提出一种基于分数阶滑模变结构的永磁同步电动机直接转矩控制技术,采用组合趋近率设计分数阶滑模控制器,即在控制前期采用幂指数趋近率,控制后期采用变速趋近率。仿真结果表明该控制方法能够有效减小磁链和转矩脉动,显著增加系统响应速度,抗扰动性能好,鲁棒性强。

分数阶滑模趋近率在SMVS-DTC中的应用

为了减小基于滑模变结构的直接转矩控制技术中存在的转矩、磁链脉动,以及系统抖振等问题,提出一种改进型的分数阶滑模控制器。分析了分数阶指数函数曲线的特性,并在滑模切换面设计中引入了分数阶积分项来减小转矩、磁链脉动,同时采用分数阶微分方程和指数趋近率相结合的新型趋近率来提高收敛速度、减小暂态过程中的超调量。仿真结果显示,改进后的分数阶滑模控制器能明显减小系统抖动,更快地到达稳定状态,并且对干扰信号有较强的鲁棒性。

基于EDEM的装载机工作装置运动轨迹控制研究

针对装载机工作装置控制系统在实际运行时存在收敛速度慢、跟踪精度低、干扰项(铲装阻力)难以估计等问题,提出了一种基于离散单元法(DEM)的铲装阻力补偿的非奇异快速终端滑模控制方法。首先,推导出了装载机工作装置的数学模型;在EDEM中对工作装置的铲装阻力进行了研究,并与非奇异快速终端滑模控制结合,得到了带有铲装阻力补偿的非线性反馈控制律;然后,采用Lyapunov函数对所提控制方法做了性能论证;最后,在MATLAB/Simulink中,验证了所设计控制系统的稳定性和收敛特性,且与比例微分滑模控制器(PDSMC)、分数阶比例微分滑模控制器(FOPDSMC)做了对比分析。研究结果表明:在无干扰和有干扰2种工况下,采用基于铲装阻力补偿的非奇异快速终端滑模控制方法,轨迹跟踪误差的均方根误差(RMSE)分别降至对照组数据的8%和22%,误差收敛速度可分别提升70%和57%;以上结果说明,基于铲装阻力补偿的非奇异快速终端滑模控制方法的综合表现更好。

基于分数阶滑模面控制的分数阶超混沌系统的投影同步

本文通过设计一个新型的含分数阶滑模面的滑模控制器,应用主动控制原理和滑模控制原理,实现了一个新分数阶超混沌系统和分数阶超混沌Chen系统的投影同步.应用Lyapunov理论,分数阶系统稳定理论和分数阶非线性系统性质定理对该控制器的存在性和稳定性分别进行了分析,并得到了异结构分数阶超混沌系统达到投影同步的稳定性判据.数值仿真采用分数阶超混沌Chen系统和一个新分数阶超混沌系统的投影同步,仿真结果验证了方法的有效性.

Fractional order integral sliding mode control for PMSM based onfractional order sliding mode observer

In view of the variation of system parameters and external load disturbance affecting the high-performance control of permanent magnet synchronous motor(PMSM),a fractional order integral sliding mode control(FOISMC)strategy is developed for PMSM drive system by means of fractional order sliding mode observer(FOSMO).Based on FOISMC technology,a fractional order integral sliding mode regulator(FOISM-based regulator)is designed,and a global integral sliding mode surface design method is presented,which can guarantee the global robustness of the system.Combining fractional order theory and sliding mode control theory,the FOSMO is constructed to achieve better identification accuracy of the speed and rotor position.Meanwhile the sliding mode load observer is used to observe the load torque in real time,and the observed value is transmitted to speed regulator to improve the capability of accommodating the challenge of load disturbance.Simulation results validate the feasibility and effectiveness of the proposed scheme.

Nonlinear dynamic fractional sliding mode control to the motor of mining locomotive

The harsh operating environment and complex operating conditions of the mine electric locomotive affect the control performance of the locomotive traction motor.In order to improve the speed control performance of electric locomotive traction motors,a dynamic fractional-order sliding mode control(DFOSMC)algorithm considering uncertain factors was proposed.A load torque sliding mode observer was designed for the complex load disturbance of the traction motor,and its observations were integrated into the DFOSMC controller to overcome the influence of load disturbance.Finally,the stability of the designed controller was proved by Lyapunov's theorem.Besides,the control performance of DFOSMC controller was compared with integer-order sliding mode controller and fractional-order sliding mode controller through simulation experiments.Compared with integer-order sliding mode and fractional-order sliding mode controllers,the dynamic and static performance of the DFOSMC controller with load observation is better,and it has stronger anti-interference ability.The DFOSMC controller effectively improves the control performance of the traction motor of the mining locomotive.

Speed sensorless FCS-MPTC based on FOSM-MRAS five-phase permanent magnet synchronous motor

For the two-level five-phase permanent magnet synchronous motor(FP-PMSM)drive system,an improved finite-control-set model predictive torque control(MPTC)strategy is adopted to reduce torque ripple and improve the control performance of the system.The mathematical model of model reference adaptive system(MRAS)of FP-PMSM is derived and a method based on fractional order sliding mode(FOSM)is proposed to construct the model reference adaptive system(FOSMMRAS)to improve the motor speed estimation accuracy and eliminate the sliding mode integral saturation effect.The simulation results show that the FP-PMSM speed sensorless FCS-MPTC system based on FOSM-MRAS has strong robustness,good dynamic performance and static performance,and high reliability.