六相感应电机的非线性反推矢量控制

Nonlinear backstepping vector control of six-phase induction motor

针对电机传统矢量控制运行时存在响应速度慢、抗扰性能差等问题,从六相电机的自身特点入手,提出一种新型的六相感应电机非线性反推矢量控制方法.首先,分析和建立了六相电机数学模型,并通过新虚拟电压平衡矢量来确定空间电压矢量脉宽调制(SVPWM)方案以减小电机定子谐波电流;其次,应用反推原理设计了反推控制器取代传统的PI控制器,减少系统控制中调整参数数目,实现电机对给定信号的跟踪控制;最后,在MATLAB/Simulink中进行仿真验证.仿真结果表明:所提出的控制方法与传统的PI控制方法相比,能够改善定子电流波形,具有良好的动静态性能.

Aimed at the problem of low response speed and poor robustness of the electric motor with traditional vector control(VC)in its operation,a novel nonlinear backstepping VC method of six-phase induction motor is presented starting from the characteristics of a six-phase motor proper.Firstly,the mathematical model of the six-phase motor was built and analyzed and a new virtual voltage balance vector was used to determine the plan of space voltage vector pulse width modulation(SVPWM)to reduce the stator harmonic current of the motor.Furthermore,the backstepping principle was used to design the backstepping controller,substituting for the traditional PI controller,reduce the number of parameters in the control system,and implementing the follow-up control of the induction motor after the given signals.Finally,the control system was verified by means of simulation with software MATLAB/Simulink.The simulation result showed that compared with the traditional PI control policy,the proposed control method could be used to improve the waveform of the stator current and it would have a fine static and dynamic performance.