Reliability-Oriented Design of DC-Link Considering the Second-Order Harmonic Current Routing in an SST Cell

CPSS Transactions on Power Electronics and Applications Pub Date : 2023-03-10 DOI:10.24295/CPSSTPEA.2023.00025

Jinxiao Wei;Yawei Wang;Sicong Liu;Hao Feng;Li Ran

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Abstract

Second-order harmonic current (SHC) inevitably presents in the two-stage AC/DC and DC/DC system, e.g., solid-state transformer (SST) cell. Unregulated harmonics routing leads to reliability defects, which may appear in DC-link and DC/DC stage. This manuscript presents a reliability-oriented design method via routing the SHC. Firstly, the SHC distribution in the two-stage SST cell is modeled, and their effects on the reliability of DC-link capacitor and DC/DC stage are revealed. Interactions are highlighted between the reliability of DC-link and DC/DC stage. It illustrates that a small capacitance may favor the DC-link reliability, yet jeopardizing the overall system. A tradeoff analysis is performed to achieve longer mean time to failure (MTTF) on an SST cell level. The harmonic distribution unravels a new mechanism that governs the reliability balance between critical components. It also provides an alternative perspective to the reliability-oriented design. The distribution model and design framework are performed in a 15 kW SST cell.

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考虑SST单元二阶谐波电流路由的直流链路可靠性设计

二阶谐波电流（SHC）不可避免地出现在两级AC/DC和DC/DC系统中，例如固态变压器（SST）电池。谐波路由不规范会导致可靠性缺陷，这种缺陷可能出现在直流环节和DC/DC阶段。本文通过对SHC进行布线，提出了一种面向可靠性的设计方法。首先，对两级SST单元中的SHC分布进行了建模，揭示了它们对直流环节电容器和DC/DC级可靠性的影响。直流环节的可靠性和DC/DC级之间的相互作用得到了强调。它表明，小电容可能有利于直流链路的可靠性，但会危及整个系统。执行权衡分析以在SST单元水平上实现更长的平均故障时间（MTTF）。谐波分布揭示了一种控制关键部件之间可靠性平衡的新机制。它还为面向可靠性的设计提供了另一种视角。分布模型和设计框架在15kW SST电池中执行。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

CPSS Transactions on Power Electronics and Applications

CiteScore

8.80

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0.00%

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