Power electronic converters are increasingly used in power systems. However, they are vulnerable components and prone to aging failures, thus affecting overall system reliability. Therefore, their availability modeling especially in large-scale power electronic-based power systems is of paramount importance. This letter introduces four different approaches for converter availability modeling considering aging failures under different maintenance strategies. The accuracy and calculation burden of these approaches are illustrated by numerical analysis. It is shown that the method of device of stages and piece-wise approach are the most applicable methods in the case of corrective and preventive maintenance strategies respectively.

中文翻译：

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考虑组件老化的电源转换器的可用性建模

电力电子转换器越来越多地用于电力系统。然而，它们是易受攻击的组件，容易出现老化故障，从而影响整体系统的可靠性。因此，它们的可用性建模尤其是在基于大型电力电子的电力系统中尤为重要。这封信介绍了四种不同的考虑到不同维护策略下的老化故障的转换器可用性建模方法。数值分析说明了这些方法的准确性和计算负担。结果表明，阶段装置法和分段法分别是纠正性和预防性维护策略中最适用的方法。