Five-leg inverter PWM technique for reduced switch count two-motor constant power applications
Five-leg inverter PWM technique for reduced switch count two-motor constant power applications
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DOI：
10.1049/iet-epa:20070497
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发表时间：
2008-09
影响因子：
1.7
通讯作者：
Maxwell Jones;S. Vukosavic;D. Dujić;E. Levi;P. Wright
中科院分区：
文献类型：
--
作者：
Maxwell Jones;S. Vukosavic;D. Dujić;E. Levi;P. Wright
工业应用通常需要许多变速电驱动器。在大多数情况下，这些多电机驱动系统需要独立控制各个电机。在过去的十年里，研究人员一直在努力减少多电机驱动系统中所需的电力电子设备的数量，以降低驱动系统的总体复杂性和成本。最近已经表明，可以使用五腿电压源逆变器（VSI）作为电源独立控制两台三相感应电机，其中一个逆变器腿对两台机器都是通用的。这种电源拓扑的现有脉宽调制（PWM）方法要么限制了每台机器可用的直流母线电压的数量，要么导致VSI的五个支路的开关频率不均匀和增加。提出了一种新的PWM方法，该方法有效地利用标准三相调制器，并进行适当的修改，为VSI的所有五个分支生成调制信号。它使两个机器之间可用直流母线电压的任意分布成为可能。所考虑的电源拓扑，当与开发的PWM技术结合使用时，非常适合于恒定功率应用，如中心驱动绕线机。通过稳态和瞬态运行的实验测试，验证了所开发的调制方法及其对卷绕机系统的适用性。
Industrial applications often require a number of variable speed electric drives. In the majority of cases, these multi-motor drive systems require independent control of individual motors. Over the past decade, research efforts have been made to reduce the number of power electronic devices required in multi-motor drive systems in order to reduce the overall complexity and hence cost of the drive. It has been shown recently that it is possible to independently control two three-phase induction machines using a five-leg voltage source inverter (VSI) as the supply, with one inverter leg being common to both machines. The existing pulse-width modulation (PWM) methods for this supply topology either limit the amount of DC bus voltage available to each machine or lead to uneven and increased switching frequency across five legs of the VSI. A new PWM method that effectively utilises the standard three-phase modulators in conjunction with appropriate modifications to generate modulation signals for all five legs of the VSI is presented. It enables an arbitrary distribution of the available DC bus voltage between the two machines. The considered supply topology, when utilised in conjunction with the developed PWM technique, is well suited to constant power applications such as centre-driven winders. Verification of the developed modulation method and its applicability to winder systems are demonstrated by experimental testing that includes both steady state and transient operation.