The active capacitor concept based on power electronic circuits has been proposed recently to exceed the physical limit of the passive capacitor. It retains the physical convenience of use as a passive capacitor and has the potential to increase either the power density or the lifetime depending on the applications. However, the cost of the existing design by using ceramic or film capacitors to achieve extreme performance increases a lot, which must be taken into account in the design from the industry aspect. This article proposes a cost-constrained design of an active capacitor used for dc-link applications. It is implemented based on high-current electrolytic capacitors instead of film capacitors or ceramic capacitors. A model-based optimization design procedure is discussed in terms of performance factors of interest. A case study of a 5.5-kW single-phase inverter demonstrates a 38% volume reduction of the dc link with the proposed active capacitor under specific constraints of cost, volume, power loss, and lifetime. The outcomes move one step further for the practical application of the active capacitor concept.

中文翻译：

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用于单相逆变器的成本受限的有源电容器

最近提出了基于电力电子电路的有源电容器概念，以超越无源电容器的物理限制。它保留了作为无源电容器使用的物理便利性，并有可能根据应用增加功率密度或寿命。然而，现有设计中使用陶瓷或薄膜电容器来实现极致性能的成本增加了很多，在设计中必须从工业方面加以考虑。本文提出了一种用于直流链路应用的有源电容器的成本受限设计。它是基于大电流电解电容器而不是薄膜电容器或陶瓷电容器来实现的。根据感兴趣的性能因素讨论了基于模型的优化设计程序。一个案例研究 5。在成本、体积、功率损耗和寿命的特定限制下，5 kW 单相逆变器展示了使用提议的有源电容器将直流链路的体积减少 38%。结果使有源电容器概念的实际应用又向前迈进了一步。