基于线性扩张状态观测器的无刷双馈电机控制

LINEAR EXTENDED STATE OBSERVER BASED CONTROLLER FOR BRUSHLESS DOUBLY-FED MACHINE

无刷双馈电机内部存在复杂的非线性耦合关系,针对这些内部耦合项和外部扰动在实际中难于测得的特点,提出一种基于线性扩张状态观测器(linear extended state observer,LESO)的控制方法。首先建立无刷双馈电机在同步坐标系下的复变量模型,在此基础上分别对磁链和转速设计扩张状态观测器来估计系统的内部耦合和外部扰动并对它们做出补偿,进而实现系统的解耦控制,该控制策略不依赖系统的模型和参数。仿真对比结果表明,扩张状态观测器能够快速精确估计总扰动并做出补偿,具有很强的抗扰能力并可实现系统解耦。该控制器比传统控制器明显改进了系统的调节特性和鲁棒性。

There are complex nonlinear coupling effects in the brushless doubly-fed machine （BDFM） system. These coupling effects and the external disturbance are unknown in practice. To deal with this problem, a linear extended state observer （LESO） based control strategy was proposed The expressions of the control motor flux and the rotor speed were obtained based on the complex vector model of BDFM. The ESOs for flux and speed were designed, respectively, to eliminate the nonlinear coupling effects between them and compensate the complex external disturbances. On this basis, the system is decoupled. The proposed controller is independent of the model and parameters of the BDFM. The simulation results show the decoupling ability and rejecting disturbance ability of the proposed controller. The proposed controller improves the performance and the robustness of the system evidently.