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首页> 外文期刊>Power Electronics, IET >Effective space vector modulation switching sequence for three phase Z source inverters
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Effective space vector modulation switching sequence for three phase Z source inverters

机译：三相Z源逆变器的有效空间矢量调制切换序列

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摘要

A new approach in the PWM technique is proposed through proper choice of active vectors and placement of a shoot through (ST) states for three phase Z source inverter (ZSI). Compared to the existing modulation method, the power conversion interval is maximum in this technique which improves the output voltage at higher modulation indices. Also with the inclusion of ST states, the number of switching is less avoiding the switching losses. The switching is performed at higher operating frequency which reduces the voltage stress and the size of LC components. In each sector, the ST interval is properly selected to improve the bus utilisation thus increases the voltage gain of ZSI. Furthermore, the analysis is performed by deriving the expression for the RMS flux ripple over a sub-cycle and evaluated in terms of switching instants which facilitates immediate comparison for all the presented methods. The proposed method is verified through the simulation and experimental results.
机译：通过适当选择有效矢量并放置三相Z源逆变器（ZSI）的直通（ST）状态，提出了PWM技术中的一种新方法。与现有的调制方法相比，该技术中的功率转换间隔最大，从而在更高的调制指数下提高了输出电压。同样在包含ST状态的情况下，切换次数更少，避免了切换损耗。开关以较高的工作频率执行，从而降低了电压应力和LC组件的尺寸。在每个扇区中，应适当选择ST间隔以提高总线利用率，从而增加ZSI的电压增益。此外，通过推导子周期内RMS磁通纹波的表达式进行分析，并根据开关瞬间进行评估，这有助于立即比较所有现有方法。仿真和实验结果验证了该方法的有效性。

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