基于自抗扰控制器的两电机变频调速系统最小二乘支持向量机逆控制

针对多输入多输出(multiple input multiple output,MIMO)非线性强耦合的两电机变频调速系统,对其数学模型进行可逆性存在分析,进一步设计最小二乘支持向量机(least squares support vector machines,LSSVM)逆系统,串联于两电机系统之前,组成基于阶逆的伪线性复合系统,实现MIMO系统的线性化与解耦。在此基础上,采用自抗扰控制器(active disturbances rejection control,ADRC)抑制伪线性复合系统中非线性因素的作用,引入扩张状态观测器对不确定性的估计,使之参与LSSVM逆模型的构造。仿真和实验结果表明,新型控制策略可以有效减小负载扰动和LSSVM建模误差的影响,具有良好的解耦控制效果和鲁棒性。

Least Squares Support Vector Machines Inverse Control for Two-motor Variable Frequency Speed-regulating System Based on Active Disturbances Rejection

Two-motor variable frequency speed-regulating system is a multiple input multiple output(MIMO) nonlinear,and high coupling control system.Reversibility of this two-motor system was testified.Consequently,a pseudo-linear system was completed by constructing a least squares support vector machines(LSSVM) inverse model and combining it with two-motor system.The inverse model can transform the MIMO nonlinear system into a pseudo-linear combined system.In order to suppress nonlinear characteristics of the pseudo-linear system,the control strategy based on active disturbances rejection control(ADRC) is proposed,in which the uncertainty estimated by extended state observer can be used to construct LSSVM inverse model.Simulation and experimental results have shown that the proposed strategy can reduce the interference caused by load disturbance and modeling error.Good decoupling applicability along with strong robustness can be achieved by using the proposed control method.