一种感应电机定子磁场定向解耦控制方法

A stator flux orientated decoupling control of induction motors

针对感应电机按转子磁场定向控制,系统受电机转子参数变化影响较大的问题,采用定子磁场定向控制,以定子磁链作为反馈量,克服矢量控制系统对转子参数的直接依赖性,同时运用电流励磁分量解耦补偿环节,实现了定子磁场定向控制下电机转速与定子磁链间的解耦控制.并针对定子磁链估计算法中存在的纯积分问题,提出了一种改进型积分算法予以解决.最后在dSPACE实时仿真试验平台上,对所提出的控制方法进行了试验验证,试验结果和分析证明了所提出控制算法的有效性,系统动静态性能良好,实现了转速与定子磁链的解耦控制.

The accuracy of flux vector estimation is affected by the rotor parameters in rotor flux orientated control. The algorithm has the disadvantage of sensitivity to the rotor parameters. To solve these problems, a control strategy of induction motors with stator flux orientation is proposed. According to the dynamic model of induction motors, stator flux and rotor speed are controlled respectively. The main improvement is that the stator flux and rotor speed are decoupled dynamically. In addition, a new integration is proposed. A modified integrator based on the proposed algorithm is developed to solve problems associated with the pure integrator. Finally, the performance of the control scheme is verified on the dSPACE platform. According to the result of the experiment, decoupling control of the scheme is achieved. The dynamic and static results are satisfactory.