基于空间电压矢量注入的频率可变型五相永磁同步电机最大转矩电流比控制

Variable Frequency Maximum-Torque-Per-Ampere Control for Five-Phase Permanent-Magnet Motor Based on Space Voltage Vector Injection

为了解决传统最大转矩电流比(MTPA)控制方法中高频信号注入不够灵活的难题,该文提出一种频率可变型内嵌式永磁同步电机(IPMSM)MTPA控制方法。该方法通过在空间矢量脉宽调制(SVPWM)中改变各电压矢量的作用时间,产生频率可变的高频信号,并将其直接注入到逆变器中实现MTPA。由于该方法是在SVPWM算法中实现的,所以注入信号的频率随着电机转速的变化而改变,使得信号频率的选择更加灵活。同时,由于信号直接注入到逆变器中,使注入信号的频率不干扰电机中的固有谐波且不受转速、电流环的带宽限制。实验和仿真结果表明,该方法能准确地跟踪MTPA点,并且对转矩和速度变化具有较强的鲁棒性。

In order to solve the problem that the high-frequency signal injection is not flexible enough in the traditional maximum-torque-per-ampere(MTPA)control method,a novel signal injection method with variable frequency is proposed.The proposed method changes the action time of each voltage vector in space vector pulse width modulation(SVPWM)to generate a variable frequency signal,and directly injects the signal into the inverter to realize the MTPA.Since the variable frequency signal injection method is implemented in SVPWM algorithm,the frequency of the injected signal changes with the motor speed,which makes the selection of the signal frequency more flexible.Additionally,since the signal is directly injected into the inverter,the frequency of the injected signal does not interfere with the inherent harmonics in the motor.Hence,the bandwidth limitations of the current loop can be eliminated.The proposed method simplifies the part of signal analysis without reducing the tracking performance of MTPA points.Finally,the experimental and simulation results show that the method can accurately track MTPA points,and has robustness to torque and speed changes.