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传统的空间矢量脉宽调制(space vector pulse width modulation,SVPWM)算法需要进行扇区判断,各个扇区的表达式不统一,编程实现复杂。本文通过对电压空间矢量脉宽调制原理的深入分析,建立了一种特有的两相空间120°坐标系,并提出了一种基于新坐标系下的电压空间矢量脉宽调制的新算法。该算法改变了传统调制算法基于扇区的实现方式,无需扇区判断即可直接求解三相桥臂开关的占空比;通过简化中间量的运算步骤实现了对开关信号的直接求解。与传统调制方法相比,大大简化了数字实现,提高了实时性。仿真及实验结果表明了该方法的正确性和可行性。
The traditional space vector pulse width modulation (SVPWM) algorithm needs to judge the sectors. The expression of each sector is not uniform and the programming is complicated. In this paper, a special 120 ° coordinate system of two-phase space is established by in-depth analysis of the principle of voltage space vector pulse width modulation, and a new algorithm of voltage space vector pulse width modulation based on the new coordinate system is proposed. The algorithm changes the sector-based implementation of the traditional modulation algorithm and can directly solve the duty cycle of the three-phase bridge switch without sector decision. The direct solution to the switching signal is achieved by simplifying the intermediate steps. Compared with the traditional modulation methods, greatly simplifying the digital implementation, improve real-time. Simulation and experimental results show that the method is correct and feasible.