Topdogical structure of neutral-point-clamped three-level rectifier was analyzed. A mathematical model of the rectifier was established based on switching function in d-q frames. On the basis,current d-q decouple control was realized by means of dual closed loops control,so dynamic performance of the rectifier was improved. In view of shortcoming that there are a large number of trigonometric calculations in determining sector and solving action time of space vector in traditional SVPWM algorithm,a SVPWM algorithm based on non-orthogonal 60° coordinate system was proposed. The algorithm optimizes vector calculation of the three-level rectifier. The results of simulation and experiment valified correction of the algorithm.%分析了三电平中点钳位式整流器的拓扑结构,在d-q旋转坐标系下建立了其基于开关函数的数学模型,通过双闭环控制实现了电流的d-q轴解耦,使整流器的动态性能得到改善；针对传统的SVPWM算法在扇区判定和矢量作用时间求解过程中需要进行大量复杂的三角函数运算的缺点,提出了一种基于非正交60°坐标系的SVPWM算法,优化了三电平整流器的矢量运算过程.仿真和实验结果验证了该算法的正确性.
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