正弦逆变电源的数字脉宽调制技术

Digital PWM Techniques for Sine Inverter Power

文章分析比较了正弦逆变电源的数字滞环PWM技术、数字SPWM技术及空间矢量PWM技术的原理、特点及其相互之间的关系.通过构建实验平台,对数字SPWM技术和SVPWM技术进行了实验验证.实验结果表明:采用数字SPWM技术与SVPWM技术的正弦逆变电源具有逆变输出电压谐波分量低、波形畸变小的优点;在三相正弦逆变电源中后者的直流母线电压利用率比前者高.文章最后指出SVPWM技术将成为正弦逆变电源数字控制的主流技术.

This paper presented several digital Pulse Width Modulation（PWM） techniques for sine inverter power. The principle, feature and relation of each technique were analyzed and compared. By constructing an experimental platform of 3-phase PWM inverter, the digital Sinusoidal PWM（SPWM） technique and Space Vector PWM （SVPWM） technique were experimented. The results proved that the inverter output voltage, controlled by the two digital PWM techniques, had low harmonic voltage and THD, but the bus voltage utiliza- tion coefficient of SPWM technique was lower than the SVPWM technique. Finally, the paper pointed out that the SVPWM technology will be a main digital control technique for sine inverter power.