基于电压控制器的转子磁场准确定向方法研究

Research on Rotor Flux Oriented Scheme of Induction Machine Based on Voltage Controller

在异步电机转子磁场定向矢量控制中,电机温度以及运行条件的改变会造成电机定子电流的励磁分量和转子磁链方向不一致,从而对矢量控制性能产生严重影响,特别是在高速弱磁区域。文中提出了一种基于电压控制器的转子磁场准确定向方法。分析了电机端电压和转子磁场定向的准确度之间的关系,并采用了一种电压控制器来消除由于定向不准产生的定子电流励磁分量和转子磁链之间的误差角度。仿真结果表明本方案可以在整个速度范围内显著提高控制系统性能,从而对电机参数变化等对不利因素具有更强的鲁棒性。

The performance of the induction machine drive system with indirect vector control can easily be influenced by the effects of parameter mismatch and eddy current,which results that the magnetizing component of stator current can’t align with the rotor flux vector,especially in the range of high speed and flux weakening.A novel control strategy to achieve accurate rotor flux orientation based on the voltage controller is proposed in this paper.The relation between the phase voltage of the induction machine and the accuracy of the field orientation is analyzed and a voltage controller is used to eliminate the angle error between the d-axis and the rotor flux vector.The simulation results show that the performance of the drive system in the whole speed region can be improved obviously.So,the robustness of the control system to the motor parameters is raised highly.