双馈电机PI自适应无传感器矢量控制系统研究

Research on sensorless vector control based on PI adaptive system of double-fed induction motor

为了提高变速恒频双馈电机矢量控制系统运行的可靠性,文中探讨了无速度传感器的控制理论和控制方法,提出了基于PI自适应的基本结构及控制原理。分别介绍了以电磁转矩误差和定子磁链误差作为PI控制器输入的控制算法,并利用Matlab/Simulink软件对这2种算法分别进行仿真分析和比较。仿真结果表明,这2种算法均可实现观测转速对实际转速的准确跟踪,满足双馈电机矢量控制的要求。

The sensorless operation and its control method are studied in order to enhance the reliability of VSCF DFIG systems for wind turbines. And the basic structure and control theory of PI Adaptive System were introduced. The control methods which use the error of electromagnetic torque and stator flux as the input of PI controller are introduced. The simulations by Matlab/Simulation are implemented to study and compare these two control methods. The simulation results show that they can help the observation speed track the actual speed accurately and meet the requirement of vector control of double-fed motor.