A step forward or backward? Sound Transit opts for 1500 VDC traction electrification
A step forward or backward? Sound Transit opts for 1500 VDC traction electrification
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前进还是后退？
DOI：
10.1109/rrcon.2000.869989
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Bardslkey
中科院分区：
文献类型：
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作者：
K. Pham;R. Eacker;M. Burnett;M. Bardslkey
中央普吉湾地区交通管理局（或健全的交通）面临着一些有趣的权衡，他们的新轻轨系统在西雅图。每列列车的汽车数量和列车频率足够高，表明重型铁路系统可以满足预测的乘客量。由于这条21英里长的线路有三分之一是在城市街道上运行的，因此第三条铁路被取消了作为一种可能的电力收集方法。如系统模拟所证实的，采用传统的750 VDC系统时，重牵引负荷和四节车厢列车的紧密间距会导致架空接触导线和运行轨道的电压降过大。设计团队还负责减少变电站的数量，以最大限度地降低资本和维护成本。该机构及其系统工程顾问发现，750 VDC牵引电气化不是一个经济实用的解决方案。项目小组考虑了若干备选办法。晶闸管控制的整流器变电站可以扩展变电站间距，但这只能使变电站总数减少10%，并带来其他挑战。电池储能或飞轮储能违反了另一个机构的任务，即保持成熟的技术。1500 VDC牵引电气化满足所有要求，在世界范围内被广泛接受，但在美国很少见。只有两个运营中的美国公交物业使用1500 VDC的街道运行的交通，这些系统，都在芝加哥地区，可以追溯到上个世纪之交。在进行了一项研究，其中包括从牵引电气化设备供应商，车辆和推进系统制造商和其他机构的反馈，声音过境作出了选择，开发一个1500伏直流系统。本文总结了设计团队在做出这一决定时所经历的过程。讨论了系统分段、故障检测、电压调节、接触网间隙、硬件可用性等问题。
The Central Puget Sound Regional Transit Authority (or Sound Transit) faces some interesting tradeoffs for their new light rail system in Seattle. The number of cars per train and train frequency are high enough to suggest a heavy rail system to meet predicted ridership. Since one-third of the 21-mile route is surface-running on city streets, third rail was eliminated as a possible power collection method. Heavy traction loads and close spacing of the four-car trains would result in excessive voltage drop in the overhead contact conductors and running rails with a conventional 750 VDC system, as verified by the system simulations. The design team also had a mandate to reduce the number of substations to minimize capital and maintenance costs. The agency and its systems engineering consultant found that 750 VDC traction electrification was not an economically practical solution. The project team considered a number of alternatives. Thyristor-controlled rectifier substations made it possible to stretch substation spacing but this provided only, a 10% reduction in the total number of substations and posed other challenges. Battery-energy storage or flywheel-energy storage violated another agency mandate-that of staying with proven technology. 1500 VDC traction electrification met all requirements and is widely accepted worldwide, but is rare in the United States. Only two operating US transit properties use 1500 VDC for street running transit, and those systems, both in the Chicago area, date back to the turn of the last century. After conducting a study that included feedback from traction electrification equipment suppliers, vehicle and propulsion system manufacturers and other agencies, Sound Transit has made a choice to develop a 1500 VDC system. This paper summarizes the process that the design team went through in making this decision. System sectionalizing, fault detection, voltage regulation, overhead contact system (OCS) clearances, hardware availability and other issues are discussed.