Electric bus fast charging station resource planning considering load aggregation and renewable integration

To relieve the peak operating power of the electric grid for an electric bus fast-charging station, this paper proposes to install a stationary energy storage system and introduces an optimization problem for obtaining the optimal sizes of an energy buffer. The charging power demands of the fast-charging station are uncertain due to arrival time of the electric bus and returned state of charge of the onboard energy storage system can be affected by actual traffic conditions, ambient temperature and other factors. The introduced optimization is formulated as a stochastic program, where the power matching equality of the total charging demands of connected electric buses is described as a chance constraint by denoting a satisfaction probability, then a stochastic supremum for the operating power of the electric grid is defined by actual data and the problem finally can be solved by convex programming. A case study for an existing electric bus fast-charging station in Beijing, China was utilized to verify the optimization method. The result shows that the operation capacity cost and electricity cost of the electric grid can be decreased significantly by installing a 325 kWh energy storage system in the case of a 99% satisfaction probability.

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Partial Power Processing Based Converter for Electric Vehicle Fast Charging Stations

Electronics ◽

10.3390/electronics10030260 ◽

2021 ◽

Vol 10 (3) ◽

pp. 260

Author(s):

Jon Anzola ◽

Iosu Aizpuru ◽

Asier Arruti

Keyword(s):

Electric Vehicle ◽

Power Converters ◽

Power Ratio ◽

Charging Station ◽

Fast Charging ◽

Full Power ◽

Processing Architectures ◽

Charging Stations ◽

Fast Charging Station ◽

Partial Power Processing

This paper focuses on the design of a charging unit for an electric vehicle fast charging station. With this purpose, in first place, different solutions that exist for fast charging stations are described through a brief introduction. Then, partial power processing architectures are introduced and proposed as attractive strategies to improve the performance of this type of applications. Furthermore, through a series of simulations, it is observed that partial power processing based converters obtain reduced processed power ratio and efficiency results compared to conventional full power converters. So, with the aim of verifying the conclusions obtained through the simulations, two downscaled prototypes are assembled and tested. Finally, it is concluded that, in case galvanic isolation is not required for the charging unit converter, partial power converters are smaller and more efficient alternatives than conventional full power converters.

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Intelligent energy flow management of a nanogrid fast charging station equipped with second life batteries

International Journal of Electrical Power & Energy Systems ◽

10.1016/j.ijepes.2020.106602 ◽

2020 ◽

pp. 106602

Author(s):

Stefano Leonori ◽

Giorgio Rizzoni ◽

Fabio Massimo Frattale Mascioli ◽

Antonello Rizzi

Keyword(s):

Second Life ◽

Energy Flow ◽

Flow Management ◽

Charging Station ◽

Fast Charging ◽

Fast Charging Station

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Modular Approach to Ultra-fast Charging Stations

Journal of Electrical Engineering and Technology ◽

10.1007/s42835-021-00757-x ◽

2021 ◽

Author(s):

Carola Leone ◽

Michela Longo

Keyword(s):

Impact Analysis ◽

Road Transport ◽

Modular Approach ◽

Long Distance ◽

Charging Infrastructure ◽

Charging Station ◽

Fast Charging ◽

Modular Architectures ◽

The Impact ◽

Fast Charging Station

AbstractRoad transport electrification is essential for meeting the European Union's goals of decarbonization and climate change. In this context, an Ultra-Fast Charging (UFC) system is deemed necessary to facilitate the massive penetration of Electric Vehicles (EVs) on the market; particularly as medium-long distance travels are concerned. Anyway, an ultra-fast charging infrastructure represents the most critical point as regards hardware technology, grid-related issues, and financial sustainability. Thus far, this paper presents an impact analysis of a fast-charging station on the grid in terms of power consumption, obtained by the Monte Carlo simulation. Simulation results show that it is not economical convenient size the assumed ultra-fast charging station for the maximum possible power also considering its high impact on the grid. In view of the results obtained from the impact analysis, the last part of the paper focuses on finding a method to reduce the power installed for the DC/DC stage while keeping the possibility for the electric vehicle to charge at their maximum power. To achieve this goal a modular approach is proposed. Finally, two different modular architectures are presented and compared. In both the solutions, the probability of having EVs charging at limited power is less than 5%.

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