基于载波的空间矢量脉宽调制方法分析

Study on Carrier-based Space Vector PWM Method

介绍了空间矢量脉宽调制(SVPWM)的基本原理,将SVPWM和规则采样PWM进行了对比分析,给出了两种不同形式的SVPWM调制函数表达式,并证明了二者的等效性。特别是将零矢量分配方式与各种SVPWM连续调制和不连续调制之间的关系统一于一个调制函数表达式中,从而揭示出SVPWM实质上是一种零序分量注入式载波PWM。由此提出了基于载波的SVPWM实现方法,且在Matlab/Simulink环境下通过仿真分析验证了该法的正确性和有效性。

The principle of space vector pulse width modulation for the three-phase voltage source inverter is described. Then SVPWM is compared with the regular-sampled PWM. Two SVPWM modulation function formulas are presented, and their equivalence is verified. In particular, the general relationship between the zero-vector partitioned way and all continuous and discontinuous SVPWM methods is embodied in a modulation function formula ,so it is revealed that SVPWM is a zero-sequence signal injection carrier-based PWM in effect. As a result, the triangle intersection SVPWM method is proposed, and its correctness and validity are simulated and proved with the help of Matlab/Simulink.