一种简化三电平SVPWM的感应电动机矢量控制方法

摘要

Since the traditional modulation method is so complicated in the control of NPC three-level inverter,a method of vector control based on a simplified three-level SVPWM algorithm was proposed.A three-level space voltage vector can be decomposed to two-level space voltage vectors,and the simplified algorithm was obtained with the translation of voltage vector.The determination of the fundamental vector and the selection of appropriate switch states were obtained respectively to use the two-level space vector SVPWM algorithm.The calculation of vector control for three-level inverter was reduced.The simulation analysis and the experiment results indicate that the control of NPC three-level inverter based on the method can reduce the calculation,and keep excellent dynamic and steady-state performances of the motor control system.%针对二极管箝位型(NPC)三电平逆变器控制中传统调制算法复杂的缺点,提出一种简化三电平SV-PWM的矢量控制方法.通过将三电平空间电压矢量分解为二电平空间电压矢量,对参考电压矢量进行平移,得到各个基本矢量的作用时间和选择合适的开关状态,从而减小三电平逆变器的矢量控制的计算量.仿真和实验表明,基于该方法的三电平逆变器控制既简化了控制计算,又能保持整个电机控制系统良好的动、静态性能.