Reliability Evaluation of Voltage Source Converters for MVDC Applications

2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) Pub Date : 2019-05-21 DOI:10.1109/ISGT-Asia.2019.8881326

Gayan Abeynayake, Gen Li, T. Joseph, Wenlong Ming, Jun Liang, A. Moon, Kevin Smith, James Yu

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引用次数: 7

Abstract

The emerging Medium Voltage Direct Current (MVDC) distribution networks are becoming more attractive due to their flexible control of power flow and lower losses compared to traditional AC networks. This will significantly increase the wide uptake of renewable energy sources. Voltage source converters (VSCs) are the main building blocks of modern DC systems. Achieving a high reliability is an important aspect of selecting the converters for a specific project. However, it is still unclear which type of VSC is the most suitable solution for MVDC systems. This paper addresses this question from the reliability point of view. Three commonly used VSCs are considered for the analysis namely, two-level (2L), three-level NPC (3L-NPC), modular multi-level (MMC) converters and the cascaded three-level VSC which is currently being built for the first MVDC link in the UK. The results suggest that during the early stage of operation MMC shows a higher reliability. However, in the long run the other VSCs have shown higher reliabilities.

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MVDC电压源变换器的可靠性评估

与传统的交流电网相比，新兴的中压直流(MVDC)配电网由于其灵活的潮流控制和更低的损耗而变得越来越有吸引力。这将大大增加可再生能源的广泛利用。电压源变换器(VSCs)是现代直流系统的主要组成部分。实现高可靠性是为特定项目选择转换器的一个重要方面。然而，目前还不清楚哪种类型的VSC最适合MVDC系统的解决方案。本文从可靠性的角度来解决这个问题。三种常用的VSC被考虑用于分析，即两电平(2L)，三电平NPC (3L-NPC)，模块化多级(MMC)转换器和级联三电平VSC，目前正在为英国的第一条MVDC链路建造。结果表明，MMC在运行初期表现出较高的可靠性。然而，从长远来看，其他vsc表现出更高的可靠性。

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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2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia)

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