无刷双馈电机转矩和转速的无源性控制

Passivity-based control of torque and speed of brushless doubly-fed machine

为了提高无刷双馈电机(BDFM)的控制性能,应用非线性系统的无源性控制(PBC)理论,研究BDFM的转矩和转速控制。从三相静止坐标系下BDFM的电压方程出发,导出了BDFM在dq轴转子速旋转坐标系以及功率绕组、控制绕组同步速旋转坐标系下的电压、磁链和转矩方程,建立BDFM的欧拉-拉格朗日方程,从能量的角度分析了BDFM系统的无源性,提出一种新的转矩和转速控制结构,设计相应的非线性控制器。进而搭建BDFM的PBC系统仿真模型,并将其控制效果与矢量控制和直接转矩控制的效果进行了对比。结果表明,PBC方法可以准确实现BDFM转矩、转速的跟踪控制,具有控制结构简单、动态响应性能优良、鲁棒性好的优点,比与矢量控制方法,减少了计算量,比与直接转矩控制方法,减小了转矩脉动。

To improve the control performances of Brushless doubly-fed machine（BDFM）,the passivity-based control（PBC） theory of the nonlinear system was used to study the torque and speed controls of BDFM.Based on the voltage equations of BDFM in the 3-phase stationary frame,the voltage,flux and torque equations in dq-axis of rotor speed rotating frame,power winding and control winding synchronous speed rotating frames were deduced and obtained respectively.The Euler-Lagrange equation of BDFM was established and the passivity of BDFM system was analyzed by the concept of energy conversion.A new torque and speed control structure was proposed and a nonlinear controller based on the PBC method was designed.The simulation model was then built up and the control effects of PBC,vector control（VC） and direct torque control（DTC） were compared respectively.The results show that PBC can achieve more accurate torque and speed tracking control and has the advantages of simple control structure,excellent dynamic response performance and good robustness.The calculation amount of PBC is less than that of VC and the torque ripple of PBC is smaller than that of DTC.