Reliability and Cost-Oriented Analysis, Comparison and Selection of Multi-Level MVdc Converters
Reliability and Cost-Oriented Analysis, Comparison and Selection of Multi-Level MVdc Converters
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DOI：
10.1109/tpwrd.2021.3051531
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发表时间：
2021-01
影响因子：
4.4
通讯作者：
Gayan Abeynayake;Gen Li;T. Joseph;Jun Liang;Wenlong Ming
中科院分区：
文献类型：
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作者：
Gayan Abeynayake;Gen Li;T. Joseph;Jun Liang;Wenlong Ming
由于直流技术相对于交流技术的优势，它在中压领域的应用引起了人们的极大兴趣。然而，要充分利用这一发展的能力，选择合适的电力电子变流器拓扑是一个关键方面。从电压型换流器(VSC)池中，尚不清楚哪种拓扑结构适合中压直流(MVDC)级别的多兆瓦应用。针对这一问题，提出了一种基于可靠性和最优冗余水平的MVDC应用VSC选择准则。这将与运营效率和投资回报等其他功能因素结合在一起。三种候选的多电平拓扑，即三电平中点钳位变流器(3L-NPC)、模块化多电平变流器(MMC)和级联3L-NPC(正用于英国第一个MVDC链路)已经在$\pm$10千伏到$\pm$50千伏的两级VSC上进行了评估。结果表明，随着MVDC电压水平的增加，MMC具有更好的性能，而在低MVDC电压水平下，3L-NPC是最突出的拓扑结构。
DC technology has gained considerable interest in the medium voltage applications due to the benefits over the AC counterpart. However, to utilize the full capacity of this development, the selection of a suitable power electronic converter topology is a key aspect. From the pool of voltage source converters (VSC's), it is unclear which topology is suitable for multi-megawatt applications at medium voltage dc (MVdc) levels. To address this, the paper proposes a selection guideline based on reliability and optimum redundancy levels of VSCs for MVdc applications. This will be combined with other functional factors such as operational efficiency and return-on-investment. Three candidate multi-level topologies namely three-level neutral point clamped converter (3L-NPC), modular multi-level converter (MMC) and cascaded 3L-NPC (which is being used for the first MVdc link in the U.K.) have been evaluated over two-level-VSC from $\pm$10 kV to $\pm$50 kV. Results show that with the increase of MVdc voltage level MMC shows better performance whereas at low MVdc voltage levels 3L-NPC is the prominent topology.