【摘要】 对三相三线(3P3W)和三相四线(3P4W)两种接线制式下正弦脉宽调制(SPWM)和空间矢量脉宽调制(SVPWM)的发生原理和数字实现进行了深入分析,通过数学计算推导证明了3P4W系统中SPWM和SVPWM的归一化,并给出了相关波形对这一结论进行验证。研究表明,虽然3P3W系统中SVPWM在谐波抑制和直流电压利用率上均优于SPWM,但在3P4W系统中两者从控制效果上看是一致的,而此时SPWM因其算法简单、易于实现而优于SVPWM,从而在工程应用上更具优势。更多还原

【Abstract】 In this paper, the working principle and digital implementation of sinusoidal PWM (SPWM) and space vector PWM (SVPWM) are analyzed in both three-phase three-wire (3P3W) and three-phase four-wire systems (3P4W). Based on mathematical derivation, the unification of SPWM and SVPWM in 3P4W systems is proven. Relative waveforms are given to demonstrate the correctness of this conclusion. The unification shows that, although SVPWM is superior to SPWM in 3P3W systems due to better harmonic suppression and higher dc-link voltage utilization, their output characteristics in 3P4W systems are identical to each other. Hence, SPWM become the preferred PWM strategy due to its simple algorithm and easy implementation.更多还原