SVPWM控制算法研究与实现

Study on control of SVPWM

为解决电机控制中普通正弦脉宽调制(SPWM)下谐波分量低、电压利用率低及数字化实现比较复杂等问题,将空间矢量脉宽调制(SVPWM)技术应用到交流传动控制领域具有十分重要的现实意义。通过建立基于SVPWM矢量控制原理的模型,分析了比较器中高、低有效电平与扇区选择及比较器切换点之间的关系,提出了矢量控制算法中扇区选择的方法,并以单增锯齿波为例对其进行了评价。最后针对理论推导进一步实施了仿真试验。试验结果表明,在SVPWM控制算法中,扇区选择以及比较器切换点的确定,将随着比较器中高、低有效电平的不同而变化。

In order to solve the problems of general sinepulse width modulation（SPWM） modulation in motor control, such as small harmonic component, high efficiency in voltage utilization and difficult realization of digitization, etc. , it is of great significance to apply the space vector pulse width modulation （SVPWM） technology to the field of AC drive control. By means of building models based upon the SVPWM control principles, the relationship between high ＆ low level effective, sector selection and switching point of the comparator, was analyzed and then various ways of how to select sections in vector control algorithm were put forward, which was accordingly evaluated by taking upward sawtooth wave as an example. Finally a simulation test was further conducted on the basis of theoretical deduction. The experimental results show that in the vector control algorithm the sector selection and switching point always varies with the high and low level effective in the comparator.