基于坐标分量的三电平SVPWM快速算法

Study and Realization of a Three-Level SVPWM Fast Algorithm Based on Coordinate Components

比较并研究了不同的SVPWM改进算法,指出各种改进算法的本质差别在于算法所基于的坐标系不同,从而决定了位置判断、矢量作用时间计算的难易差别。提出一种新算法,该算法建立在一种与所有扇区及小区域严格对称的新坐标系上,只需一次计算电压参考矢量在新坐标系中的分量,即可快速判断参考矢量所在位置并计算矢量作用时间,避免了三角函数运算和矢量幅角求取,相比传统SVPWM算法具有更好的实时性。通过实验验证了算法的有效性。

A series of improved space vector pulse width modulation(SVPWM) algorithms are comparatively studied.The essential difference between them is the coordinate system on which the algorithm based,which causes the difference of position judge and calculation difficulty.A novel algorithm is proposed,which based on a new coordinate system strictly symmetrical with all sectors and small areas.Reference vector position judge and calculation time can be easily done only after calculating the coordinate components.Compared to conventional algorithms,it has better real-time,because trigonometric operation and vector argument calculation are avoid.The feasibility of the proposed algorithm is verified via experiment.