基于载波的九相SVPWM算法仿真研究

Study and Simulation on Nine-Phase Carrier Based on SVPWM Algorithm

为实现九相逆变器的PWM控制,提出基于载波的九相电压空间矢量脉宽调制算法,将九相SPWM与SVPWM算法用统一数学形式表示,根据零矢量在开关周期内的不同分布,实现不同的九相PWM调制方法,系统实时性高,并可用于相数更多的传动控制系统。改善传统的矢量控制策略,提出对各谐波平面电流进行解耦,将解耦后的各dq轴电流分别进行闭环控制,减少电机输出转矩脉动,提高九相传动系统稳定性。

In order to achieve the control of the nine-phase inverter, carrier-based nine-phase SVPWM algorithm is put forward. The algorithm is that a unified mathematical form is used to represent the nine-phase SPWM and SVPWM algorithm, according to the zero vector distribution in the switching cycle, to achieve different nine-phase PWM modulations, The algorithm＇ s real-time performance is high and it can be used in the drive control system which has more phases. The improvement of the traditional vector control strategy puts forward the method of decoupling the harmonic current plane. After decoupling, every current on the DQ-axis is a closed-loop control, reduces the motor output torque ripple, and improves the nine-phase drive system stability.