News Wire, Dec. 8, 2023]. Biden highlighted the $6.1 billion for the Brightline West and California high speed projects included in the Federal-State Partnership funding during an appearance Friday in Las Vegas, Nev., saying "world-class high speed rail" had been one of his commitments as a presidential candidate.
3.2 Cycle efficiency Cycle efficiency, also known as round-trip efficiency, is the ratio of the output electrical energy to the input electrical energy as a percentage during a full charge/discharge cycle. Therefore, it is a key indicator of energy efficiency. According to [], the cycle efficiency of ESSes can be classified into three levels: very high efficiency …
The recovered energy shows a maximum in correspondence of a 20% braking request; however, this low value of the braking request involves that the braking distance and the braking time (respectively reported in Fig. 22, Fig. 23) are quite high, beyond the acceptable limits usually considered in high-speed applications.
On the basis of the model of the TPSS, the power flow can be calculated. The high-speed railway is a nonlinear system, so the iteration method is applied to solving the power flow problem. There are two main methods for iteration: Newton–Raphson method and train-timetable method. 1) Newton–Raphson method.
Across routes, in comparison to the Hyperloop, the Japanese SCMaglev (Fritz et al., 2018) is more energy efficient with a greater average speed because SCMaglev is a mass mode of transport ...
On the other hand, the high-speed electric multiple units (EMUs) have been widely applied in China''s high-speed railway (HSR), which possess the high power factor (PF) and huge traction power. For example, the traction power of CRH380AL has arrived at 20 MW, and the PF is closed to 1 [ 2, 3 ]).
The integration of hybrid energy storage systems (HESS) in alternating current (AC) electrified railway systems is attracting widespread interest. However, little attention has been paid to the interaction of optimal size and daily dispatch of HESS within the entire project period. Therefore, a novel bi-level model of railway traction substation energy …
Courtesy : edition.cnn (CNN) — At the beginning of the 21st century China had no high-speed railways.Slow and often uncomfortable trains plodded across this vast country, with low average speeds making journeys such as Shanghai-Beijing a test of travel endurance. Today, it''s a completely different picture. The world''s most populous …
The Spanish government has given the go-ahead to develop the world''s first hydrogen-electric high-speed train capable of going over 155 mph, offering a multi-million dollar grant to help fund the ...
Traction power supply system (TPSS) sometimes suffers a short interruption, which will lead trains losing power during their operations. In this emergency situation, to ensure passenger safety, an effective way is to drive the train to a nearest station using on-board energy storage systems (OESS). This paper presents two methods to compute …
High speed rail would much more efficient and economic for these trips, yielding substantial cost, fuel, and time savings. High speed rail is particularly cost-effective under scenarios where oil prices remain at or above current levels. The most economic target speed for rail service can vary from place to place, and may change over time for …
Internationally, high-speed train aerodynamic noise tests are often carried out in German-Dutch wind tunnels (DNW), German Aerospace Center (DLR) and Japan Railway Technical Research Institute (RTRI). Taking RTRI as an example, Yamazaki et al. [15, 16] measured the aerodynamic noise of a 1:7 scaled high-speed train model, and …
In such emergency situations, trains are expected to achieve autonomy operation powered by on-board energy sto... Optimal driving strategies for emergency operation of high‐speed trains using on‐board energy storage systems - Zhu - 2023 - IET Intelligent Transport Systems - Wiley Online Library
High-speed rail transportation utilizes 80–90% less energy and produces 3–4 times less pollution than air travel [30]. The goal of achieving net-zero global CO 2 emissions by 2050 must now be maintained by ensuring that the 2021 global emissions recovery was an anomaly and that sustainable investments paired with increased clean …
The reduction of the voltage imbalance by means of the use of balancing transformers has been comprehensively studied in literature [12, 13].Most of these works make use of simple formulae to calculate such impact. However, as [] states, this latter approach can underestimate its real value because it neglects the interaction between …
HIGH speed railway has developed rapidly in recent years. Traction power supply system, which is the main source of current train power, is related to the safe operation of railway transportation and power grid. Electrified railway is considered to be …
This article presents a microscopic simulation model and corresponding energy-optimal control method for high-speed trains. The vehicle-line-coupled longitudinal dynamics model and nonlinear power loss model of the traction transmission system (TTS) for different traction force and speed pairs are discussed. Based on these detailed models, …
High speed trains receive their electric power from over head wires, mostly at a voltage of 25 kV 50 Hz, and is collected via a pantograph atop the train. Wires strung along a set of catenary are the most common types of powering high speed trains, as it is commonly the most energy efficient way, as it reduces the reliance on fossil fuels, and ...
high-speed rail (HSR), passenger train that generally travels at least 200 km (124 miles) per hour and can cruise up to 355 km (221 miles) per hour, though some have reached higher speeds. More than 20 countries, largely in Asia and Europe, have high-speed rail networks. Transportation researchers have found that traveling via high …