感应电机软锁相环矢量控制系统研究

Research on Soft Phase Locked Loop Vector Control System for Induction Motor

感应电机矢量控制的难点在于电机转速及同步电角度的计算。研究了感应电机矢量控制系统工作原理。通过基于软锁相环方法解算电机转速、角度。通过感应电机磁链模型解算转差转速。利用电磁感应原理使用定子电流和电机参数实现了转差转速计算,克服了转子电流不可测的缺点。模型矢量控制用电角度采用电机转速与转差转速分别积分再求和的方法求得。建立仿真模型,取合适的控制参数对控制环路进行仿真分析,仿真结果表明系统稳定且电机转速及同步电角度计算准确。搭建实验环境测试矢量控制效果,试验结果表明此感应电机矢量控制系统快速、稳定。

The difficulty of inductive motor vector control lies in the calculation of motor speed and synchronous electric angle.The principle of vector control system of induction motor was studied.The motor speed and angle were calculated by using the soft phase locked loop method.The sliding speed was calculated by induction motor flux model.Using the principle of electromagnetic induction,stator current and motor parameters were used to calculate the rotating speed,and the unmeasurable disadvantages of rotor current were overcome.The model vector control power angle was obtained by integrating the motor speed and the sliding speed respectively.The simulation model was established,and the control loop was simulated and analyzed with the appropriate control parameters.The results show that the system is stable and the motor speed and synchronous electric angle are calculated accurately.The experimental results show that the vector control system of the induction motor is fast and stable.