一种考虑死区与最小脉宽限制的IPWM算法

发布时间：2018-04-22 10:30

本文选题：电压源型逆变器 + 综合式脉宽调制　；参考：《电工技术学报》2014年12期

【摘要】：由于存在死区时间和最小脉宽限制,造成两电平三相电压源型逆变器的实际电压空间缩小,因此,传统的七段式SVPWM及其过调制算法不再完全适用。为此,本文提出了一种新颖的考虑死区与最小脉宽限制的综合式脉宽调制(IPWM)算法。首先,该算法将经典的七段式SVPWM与五段式DPWM1、三段式PWM、一段式PWM综合起来,并重新划分了线性调制区和过调制区,有效扩展了实际的电压空间。其次,该算法对过调制算法进行优化,减小了运算量并降低了输出谐波;同时,通过对参考电压进行线性修正,有效地提高了输出电压基波幅值的线性度。针对调制电平与恒定电平之间的切换问题,也给出了基于有限状态机的新死区插入方法。最后,在感应电机的实验结果验证了该算法的可行性与优越性。
[Abstract]:Due to the existence of dead time and minimum pulse width restriction, the actual voltage space of the two level three-phase voltage source inverter is reduced. Therefore, the traditional seven segment SVPWM and its over modulation algorithm are no longer completely applicable. Therefore, a novel integrated PWM (IPWM) algorithm which considers the dead zone and the minimum pulse width is proposed. The algorithm combines the classic seven segment SVPWM with five segment DPWM1, three segment PWM and one segment PWM, and redivides the linear modulation and over modulation regions to effectively expand the actual voltage space. Secondly, the algorithm optimizes the over modulation algorithm to reduce the amount of operation and reduce the output harmonics; at the same time, through the reference voltage. Linear correction has effectively improved the linearity of the amplitude of the output voltage base wave. For the switching between the modulation level and the constant level, a new dead zone insertion method based on the finite state machine is also given. Finally, the feasibility and superiority of the algorithm are verified by the experimental results of the induction motor.

【作者单位】：华南理工大学自动化科学与工程学院;
【分类号】：TM464

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