新型无扇区空间矢量脉宽调制算法  

A Novel Algorithm of Space-vector PWM Without Sector Calculation

作　　者：方斯琛[1] 李丹[1] 周波[1] 黄佳佳[1] 

机构地区：[1]航空电源航空科技重点实验室(南京航空航天大学),江苏省南京市210016

出　　处：《中国电机工程学报》2008年第30期35-40,共6页Proceedings of the CSEE

摘　　要：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 algorithm of conventional space vector PWM is based on 6 space sectors, and it needs complex coordinate transformations, and this leads more calculation operations and low calculation precision. A Novel algorithm of space vector PWM for three-phase voltage inverter is proposed, and the coordinate transformation in new algorithm is based on a new 120° coordinate system. New algorithm calculates switching time instances without space sectors calculation, and the base space vector which is used in traditional algorithm is ignored. The whole algorithm becomes very simple and the calculation results become more accurate. New algorithm can easily be used in digital control system, and it has merit of reducing calculation time. The simulation and experimental results show the validity and feasibility.

关 键 词：空间矢量脉宽调制 三相逆变器 坐标系 新型调 制算法 

分 类 号：TM41[电气工程—电器] TM345