三相PWM整流器的死区效应分析及补偿方法

在三相PWM整流器的功率管驱动信号中加入死区时间可防止电压直通,但这会对变换器的电压电流波形产生影响,称之为死区效应。为此,详细描述了死区时间内变换器的工作过程,提出了三相PWM整流器的死区电压效应和电流效应,并分别进行了定量分析。然后结合空间矢量调制策略,引入了死区效应空间矢量的概念,统一并从本质上解释了死区的两种效应。为了克服死区效应的不良影响,提出了两种补偿措施,并详细介绍了利用DSP的数字实现方法,这两种措施均不需要改变硬件电路,也不会增加控制器的复杂度和负担。最后,通过实验验证了理论分析的正确性和补偿措施的有效性,还指明了进一步研究的方向。

Analysis and Compensation of Dead-time Effects in Three-phase PWM Rectifiers

To prevent short-circuit in the three-phase PWM rectifiers,dead-time should be inserted into driver signals,which affects current and voltage waveforms of the voltage-source converters,called the dead-time effects. We described the work process of the converters in the dead time,and proposed the current effect and voltage effect of the dead-time for three-phase PWM rectifier,with corresponding quantitative analysis. Combining space vector modulation strategy,the concept of dead-time space vector was introdu...