Commuter Rail Reelectrification: Is It Still Justified?

2003 ◽  
Vol 1838 (1) ◽  
pp. 11-18 ◽  
Author(s):  
John G. Allen ◽  
John P. Aurelius
Keyword(s):  
New Jersey ◽  
The Netherlands ◽  
High Voltage ◽  
Direct Current ◽  
North American ◽  
State Of The Art ◽  
Alternating Current ◽  
Dc System ◽  
Traction Motors ◽  
Commuter Rail

From the late 1960s through the mid-1990s, North American commuter railroads electrified with overhead wire moved toward high-voltage alternating current (AC) at commercial frequency so as to adopt state-of-the art technology. The extent and complexity of reelectrification have varied greatly, as projects in New Jersey, Connecticut, and Montreal, Canada, (and one planned for the Netherlands) show. Changes in the justification threshold for reelectrification are reviewed, along with a decision to retain a direct current (DC) system in Chicago. The recent development of onboard inverters, changing DC into AC for traction motors, has made it easier for electric rail operations to enjoy the benefits of AC propulsion without reelectrification costs.

A Comparative Study of GaN-Based Direct Current and Alternating Current High Voltage Light-Emitting Diodes

2018 ◽  
Vol 215 (10) ◽  
pp. 1700554 ◽  
Author(s):  
Shengjun Zhou ◽  
Yilin Gao ◽  
Chenju Zheng ◽  
Yingce Liu ◽  
Hongpo Hu ◽  
...  
Keyword(s):  
Comparative Study ◽  
High Voltage ◽  
Direct Current ◽  
Light Emitting Diodes ◽  
Alternating Current ◽  
Light Emitting

scholarly journals Heuristic remedial actions in the reliability assessment of high voltage direct current networks

2021 ◽  
Vol 11 (6) ◽  
pp. 4622
Author(s):  
Mario A. Rios ◽  
Maria F. Perez
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Reliability Assessment ◽  
Test System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Dc System ◽  
High Voltage Direct Current ◽  
Operating Limits ◽  
Remedial Actions

<p>Planning of high voltage direct current (HVDC) grids requires inclusion of reliability assessment of alternatives under study. This paper proposes a methodology to evaluate the adequacy of voltage source converter/VSC-HVDC networks. The methodology analyses the performance of the system using N-1 and N-2 contingencies in order to detect weaknesses in the DC network and evaluates two types of remedial actions to keep the entire system under the acceptable operating limits. The remedial actions are applied when a violation of these limits on the DC system occurs; those include topology changes in the network and adjustments of power settings of VSC converter stations. The CIGRE B4 DC grid test system is used for evaluating the reliability/adequacy performance by means of the proposed methodology in this paper. The proposed remedial actions are effective for all contingencies; then, numerical results are as expected. This work is useful for planning and operation of grids based on VSC-HVDC technology.</p>

scholarly journals Optimal operation of hybrid high voltage direct current and alternating current networks based on OPF combined with droop voltage control

2018 ◽  
Vol 101 ◽  
pp. 176-188 ◽  
Author(s):  
Mònica Aragüés-Peñalba ◽  
Joan Sau Bassols ◽  
Samuel Galceran Arellano ◽  
Andreas Sumper ◽  
Oriol Gomis Bellmunt
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Voltage Control ◽  
Alternating Current ◽  
Optimal Operation ◽  
High Voltage Direct Current
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