基于定子电流矫正的异步电机间接定子磁场定向控制

提出一种基于定子电流误差的间接定子磁场定向矫正控制方法。分析了定子dq轴电流以及定子磁链的关系,推算出q轴电流对定子磁场的去磁分量,在负载变化时加大d轴电流补偿该分量,实现定子电流dq轴分量的分解。采用了磁链开环的矢量控制,避免了传统磁场定向矢量控制在低速时磁场观测的复杂性和不准确性。然而为保证磁场定向的准确性,提出了基于定子电流误差的磁场定向矫正方法,通过分析磁场定向的超前和滞后时dq轴给定电流和反馈电流的关系,补偿到q轴电流,进而改变转差来弥补磁场定向不准带来的误差。最后,搭建了异步电机Matlab仿真模型和实验平台,结果表明,磁场定向在稳态运行和电机参数变化时有良好的矫正效果,保证控制系统的静、动态性能。

Indirect Stator Field-Oriented Control for Induction Motor Based on the Stator Current Correction

In this paper,a new method of indirect stator field-oriented control for induction motor based on the stator current correction is proposed.The dq axis stator current and the stator flux linkage are analyzed.The relationship between q axis current and demagnetization component of stator flux linkage is calculated,and the decomposition of dq axis stator current is achieved.Using the indirect field-oriented vector control,the complexity and inaccuracy of the flux linkage observation in traditional field-oriented vector control at low speed are avoided.In order to guarantee the accuracy of the flux linkage orientation,the flux linkage orientation based on the correction of stator current error is proposed in this paper.Through the analysis of flux linkage,the dq axis dvanced current and delayed current,compensates to q axis current,and changes the slip to compensate to the error of the flux linkage orientation.Finally,the asynchronous motor of Matlab simulation model and experimental platform is established.And the results show that the system has great correction effects on the steady state operation and the variation of the motor parameters to ensure accurate static and dynamic performance.