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Reliability and energy sharing analysis of a fault-tolerant multilevel inverter topology

机译：容错多级逆变器拓扑的可靠性和能量共享分析

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摘要

Photovoltaic (PV) systems, especially which are installed in the remote areas, stand in need for a highly reliable system. A high failure rate of the semiconductor switches and capacitors yields a very low reliability of the inverters used in the PV system. Conventional two-level inverters are replaced by multilevel inverters (MLIs) to effectively improve the output quality waveform. However, MLIs incorporate a high device count in their architecture which further impairs the reliability of the PV system. Recent research has focused on developing fault-tolerant MLI topologies with reduced device count. However, the number of active devices and power losses, factors which are many of the times overlooked, are key in determining the reliability of the inverter. Here, the reliability of a novel fault-tolerant MLI topology is evaluated bearing in mind the effect of power losses on the junction temperature. Equal (or best) voltage source utilisation characteristics help in maintaining the uniform charge of the batteries. The concept of reliability is evaluated mathematically. The fault tolerance and even source utilisation of the proposed topology is verified through the obtained experimental results.
机译：光伏（PV）系统，尤其是安装在偏远地区，适用于高度可靠的系统。半导体开关和电容器的高故障率产生了光伏系统中使用的逆变器的非常低的可靠性。传统的双层逆变器被多级逆变器（MLIS）取代，以有效地提高输出质量波形。然而，MLIS在其体系结构中包含高器件计数，这进一步损害了PV系统的可靠性。最近的研究专注于开发具有降低的设备数量的容错MLI拓扑。然而，有源器件和功率损耗的数量，多次被忽视的因素是确定逆变器的可靠性的关键。这里，考虑到电力损耗对结温的影响，评估了新型容错MLI拓扑的可靠性。等于（或最佳）电压源利用特性有助于保持电池的均匀电荷。在数学上评估可靠性的概念。通过获得的实验结果验证了所提出的拓扑的容错甚至源利用率。

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