Regenerative energy utilization in a.c. traction power supply system

Hayashiya, Hitoshi; Yokokawa, Shoji; Iino, Yuuki; Kikuchi, Shinya; Suzuki, Takashi; Uematsu, Shoji; Sato, Naomi; Toshihiko, Usui

doi:10.1109/epepemc.2016.7752152

Cited by 20 publications

(19 citation statements)

References 9 publications

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“…Regarding regenerative energy utilization in high-speed railway, there is a large potential but the installation costs is not feasible under the actual conditions [9].…”

Section: Future Prospectsmentioning

confidence: 99%

Recent Trend of Regenerative Energy Utilization in Traction Power Supply System in Japan

Hayashiya

2017

Urban Rail Transit

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In 2006, the first Lithium-ion battery in Japan was installed in traction power supply system by the West Japan Railway Company and now more than 20 energy storage systems have already been installed in traction power supply system in Japan. In this article, the recent Japanese trends of regenerative energy utilization are summarized not only in DC railway but also in AC railway. We, East Japan Railway Company, have installed three energy storage systems for DC railway and one railway static power conditioner (RPC), not energy storage system, for AC railway for regenerative energy utilization. The effects of these systems are also shown quantitatively in this paper.

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“…Regarding regenerative energy utilization in high-speed railway, there is a large potential but the installation costs is not feasible under the actual conditions [9].…”

Section: Future Prospectsmentioning

confidence: 99%

Recent Trend of Regenerative Energy Utilization in Traction Power Supply System in Japan

Hayashiya

2017

Urban Rail Transit

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“…Conventionally, the RBE is reversed from the traction power supply system to the public grid via traction transformers at substations. However, it is not reflected to the electric charge purchased from a utility company for railway operation [14]. Furthermore, it is not certain that the back-flown regenerative power is effectively utilized.…”

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confidence: 99%

“…By using it, the regenerative braking power can be interchanged from one supply section to an adjacent one. At present, a RPC was installed at Ushiku section post in Japan in 2014 [14]. At first, the development of RPC was to solve the three phase imbalance problem at traction substations.…”

mentioning

confidence: 99%

“…The capacity of RPCs for utilizing RBE can be much smaller than that of three phase balancing, but they have much potential to increase the environment friendliness of the AC railway systems by making use of regenerative braking power [22]. Other than that, many papers also put forward proposals for using power transfer devices (PTD; RPC [14,22], railway power quality compensator (RPQC) [23], or energy optimization controller (EOC) [24]) to utilize the RBE.However, the above schemes are independent distributed control and cannot cooperate with each other, which causes each device to not effectively play its maximum potential and may even cause energy waste. The railway smart grid paradigm provides a chance to integrate each component, including renewable energy systems, energy storage systems, RBE utilization systems, and so on, using bidirectional communication equipment and advanced computational features [25][26][27][28][29].…”

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confidence: 99%

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Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Gao

et al. 2019

Energies

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This paper presents a modified power supply system based on the current alternating current (AC)-fed railways with neutral zones that can further improve the eco-friendliness and smart level of railways. The modified system complements the existing infrastructure with additional energy-storage-based smart electrical infrastructure. This infrastructure comprises power electronic devices with energy storage system connected in parallel to both sides of each neutral zone in the traction substations, power electronic devices connected in parallel to both sides of each neutral zone in section posts, and an energy management system. The description and functions of such a modified system are outlined in this paper. The system allows for the centralized-and distributed-control of different functions via an energy management system. In addition, a control algorithm is proposed, based on the modified system for regenerative braking energy utilization. This would ensure that all the regenerative braking energy in the whole railway electrical system is used more efficiently. Finally, a modified power supply system with eight power supply sections is considered to be a case study; furthermore, the advantages of the proposed system and the effectiveness of the proposed control algorithm are verified.The installation of equipment that provide clean energy from renewable sources (e.g., solar panels and wind generators) to feed the traction loads in rail may have a significant impact in the energy costs and CO 2 emissions of a railway system, increasing the environment friendliness of the railway [4][5][6]. The introduction of renewable energy is to partially reduce the depletion of non-renewable energy resources and thus reduce CO 2 emissions. These outcomes have been favored by scholars and many countries, such as North American, European, China, and Japan [6,7]. But in practice, the traction energy consumption of railways has not been reduced.By contrast, the efficient driving and regenerative braking schemes differ the renewable energy scheme. They can essentially reduce the traction energy consumption of railways.Efficient driving is an effective way to reduce the traction energy consumption of rolling stock. Typically, the running state of vehicles comprises three phases: braking, speed-holding (cruising) and acceleration. At present, many literatures have studied the efficient driving and realize the traction energy savings through the optimum combination of these phases [8][9][10][11][12][13]. To implement such trajectories and maximize savings, some auxiliary systems, such as driver advisory systems (DAS) [10,11] and automatic train operation (ATO) [12,13], must be provided to drivers. The trials of such systems have shown savings of 5-18%. However, with efficient driving, the savings of energy consumption may sacrifice service quality, such as the train speed, stopping time, etc. [1].Regenerative braking energy (RBE) recovery is a simple and efficient way to reduce energy consumption, which cannot influence the operati...

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“…We, East Japan Railway Company, have already installed two Li-ion battery systems at Haijima and Okegawa and they can contribute to reduce annual electric energy supply form traction substation about 5-8% [1].…”

Section: Introductionmentioning

confidence: 99%

Proposal and effect evaluation of RPC application with energy storage system for regenerative energy utilization of high speed railway

Takagi

Hayashiya

et al. 2017

Journal of International Council on Electrical Engineering

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All car of Tohoku-Shinkansen is equipped with the regeneration brake. This car is returning electric power to the Catenary line when it is braking. Regenerative power can improve the energy efficiency if other cars can use regenerative power. But the regenerative power flows back to the grid via the traction substation when other train does not exist in the same section. At this time, the regenerative power flowing back is not metered. This study is to measure the regenerative energy that flows back to the grid. We need determine the equipment capacity if installing the electric energy storage systems and the RPC for use up regenerative power. By using a linear programming, we determined the optimal capacity of the electric energy storage systems and the RPC.

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Regenerative energy utilization in a.c. traction power supply system

Cited by 20 publications

References 9 publications

Recent Trend of Regenerative Energy Utilization in Traction Power Supply System in Japan

Recent Trend of Regenerative Energy Utilization in Traction Power Supply System in Japan

Energy-Storage-Based Smart Electrical Infrastructure and Regenerative Braking Energy Management in AC-Fed Railways with Neutral Zones

Proposal and effect evaluation of RPC application with energy storage system for regenerative energy utilization of high speed railway

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