A novel reconfigurable supercapacitor system with equalization and surge current suppression to improve energy-utilization in supercapacitor urban transit systems

IF 15 1区 工程技术 Q1 ENERGY & FUELS
Zixiang Zhao , Jun Xu , Yao Feng , Zhaohuan Liu , Qi Lv , Xuesong Mei
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引用次数: 0

Abstract

—Supercapacitors (SCs), with their high energy density, long cycle life, and excellent low-temperature performance, have emerged as a highly suitable energy storage devices for the electrification of urban transit systems (UTSs), especially for the fast-charging applications. However, the wide voltage range of SCs results in low energy utilization for the SC UTSs. Reconfigurable SC systems (RSSs) are considered a promising solution to significantly improve energy utilization rate. However, the existing RSSs are unable to maximize energy utilization and lack effective equalization capability. Moreover, the surge phenomenon is common in the RSSs, which will lead to the power device failure. To tackle these challenges, a novel RSS is proposed, integrating series-parallel reconfiguration, reconfiguration equalization, and surge current suppression. This innovative approach enables achieving ultra-high energy utilization of the SCs while significantly improving voltage consistency. Furthermore, the surge current during the mode-switching process can be effectively suppressed. Experimental results demonstrate that the RSS achieves an impressive energy utilization rate of 93.7 %, which is 137.8 % higher than the fixed-connected supercapacitor pack, and 8.8 %–16.7 % higher than the existing RSSs. The voltage difference is reduced from 493 mV to a mere 13 mV, resulting in a further 10.9 % increase in energy utilization. The surge suppression method limits the surge current from 42.3 C rate to nearly zero. The RSS proposed can remarkably enhance the driving range of electric urban rail trains and electric buses, concurrently reducing the cost and volume of the SESSs.

Abstract Image

一种具有均衡和抑制浪涌电流的新型可重构超级电容系统,以提高超级电容城市交通系统的能量利用率
超级电容器(SCs)以其高能量密度、长循环寿命和优异的低温性能,成为城市交通系统(uts)电气化,特别是快速充电应用中非常合适的储能设备。然而,SC的宽电压范围导致SC uts的低能量利用率。可重构储能系统(RSSs)被认为是一种很有前途的解决方案,可以显著提高能源利用率。然而,现有的rss无法最大限度地利用能量,缺乏有效的均衡能力。此外,浪涌现象在rss中很常见,会导致电源器件故障。为了解决这些问题,提出了一种新型RSS,集成了串并联重构、重构均衡和浪涌电流抑制。这种创新的方法可以实现超导的超高能量利用率,同时显着提高电压一致性。此外,可以有效地抑制模式切换过程中的浪涌电流。实验结果表明,RSS的能量利用率达到了93.7%,比固定连接的超级电容器组高137.8%,比现有的RSS高8.8% ~ 16.7%。电压差从493 mV降低到仅13 mV,从而进一步提高了10.9%的能量利用率。浪涌抑制方法将浪涌电流从42.3 C的速率限制到几乎为零。提出的RSS可以显著提高电动城市轨道列车和电动公共汽车的续驶里程,同时降低sess的成本和体积。
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来源期刊
Etransportation
Etransportation Engineering-Automotive Engineering
CiteScore
19.80
自引率
12.60%
发文量
57
审稿时长
39 days
期刊介绍: eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation. The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment. Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.
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