DC Fast-charging stations for EVs controlled by a local battery storage in low voltage grids

Gjelaj, Marjan; Træholt, Chresten; Hashemi, Seyedmostafa; Andersen, Peter Bach

doi:10.1109/ptc.2017.7980985

Cited by 16 publications

(16 citation statements)

References 10 publications

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“…The new design of the charging stations is based on the installation of two identical battery energy system (BES1 and BES2) that physically decouples a DC fast charging station (DCFCS) from an LV distribution grid, as shown in Figure 1. The operation of such a system is based on successive switches of the BES connections that allow one of the batteries (BES2) to be charged from the grid while the other (BES1) is charging an EV and vice versa [10]- [11]. The case study uses an AC/DC converter of 100kW and charging rate of 6C (9.7min) [11].…”

Section: A Connection To LV Grids Of the Dcfcd With Bes -Case Amentioning

confidence: 99%

“…Total annual cost = Cs + In + O&M (10) where Cs are the component costs (including the chargers, lines and transformer). The total revenue per year can be calculated as:…”

Section: B Cost and Revenue Calculation With Connection To MV Grids mentioning

confidence: 99%

“…Designing an appropriate DC-charging station in low voltage (LV) is important to avoid the connection in MV and minimize the operating costs [10]- [11]. In addition, distribution system operators (DSOs) are focused on minimizing losses and reducing the size of the electrical lines to mitigate the network congestion [12]- [13].…”

Section: Introductionmentioning

confidence: 99%

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Cost-benefit analysis of a novel DC fast-charging station with a local battery storage for EVs

Gjelaj

Traholt

Hashemi

et al. 2017

2017 52nd International Universities Power Engineering Conference (UPEC)

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-The increasing penetration of Electric Vehicles (EVs) and their charging systems is representing new highpower consumption loads for the distribution system operators (DSOs). To solve the problem of the EV range in terms of driving kilometers, the car manufacturers have invested resources on new EV models by increasing the size of the batteries. To satisfy EV load demand of the new EV models in urban areas the public DC Fast-Charging Station (DCFCS) is indispensable to recharge EVs rapidly. The introduction of the Battery Energy Storage within the DCFCSs is considered in this paper an alternative solution to reduce the operational costs of the charging stations as well as the ability to mitigate negative impacts during the congestion on the power grids. An accurate description of the DCFCS and its design system, which is able to decouple the peak load demand caused by EVs on the main grid and decrease the connection fees. Finally, an economic evaluation is done to evaluate the feasibility and the cost-benefit analysis (CBA) of the DCFCSs. The proposed approach considers various technical and economic issues, such as cost of installation, connection fees and life cycle cost of the batteries. The proposed cost-benefit analysis can be used to verify the effectiveness and applicability of DCFCS in large scale.

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Section: A Connection To LV Grids Of the Dcfcd With Bes -Case Amentioning

confidence: 99%

“…Total annual cost = Cs + In + O&M (10) where Cs are the component costs (including the chargers, lines and transformer). The total revenue per year can be calculated as:…”

Section: B Cost and Revenue Calculation With Connection To MV Grids mentioning

confidence: 99%

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Cost-benefit analysis of a novel DC fast-charging station with a local battery storage for EVs

Gjelaj

Traholt

Hashemi

et al. 2017

2017 52nd International Universities Power Engineering Conference (UPEC)

Self Cite

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“…Worldwide, there are three organizations working in the standardization of electrical vehicle charging equipment, namely the Society of Automotive Engineering (SAE), the CHAdeMO association and the International Electrotechnical Commission (IEC). The IEC 61851 defines four different charging modes: Mode 1 refers to the slow charge in AC with a maximum current of 16 A per phase (3.7 kW -11 kW) and the EV connection to the AC PG uses standard power connections; Mode 2 refers to the slow charge in AC with a maximum current of 32 A per phase (3.7 kW -22 kW) and the EV connection to the AC PG requires a specific power connection with an intermediate electronic device with a pilot control function and protections; Mode 3 refers to the slow or semi-quick charge in AC with a maximum current of 63 A per phase (< 43 kW) and the EV connection to the AC PG requires a specific device; Mode 4 refers to a DC charging, with a maximum DC current of 400 A (< 240 kW), where an external charger is required [3]. However, the PGs were not…”

Section: Introductionmentioning

confidence: 99%

Power Electronics Converters for an Electric Vehicle Fast Charging Station with Energy Storage System and Renewable Energy Sources

Pinto¹,

Monteiro²,

Exposto³

et al. 2020

EAI Endorsed Transactions on Energy Web

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Fast Charging Stations (FCS) are a key element for the wide spreading of Electric Vehicles (EVs), by reducing the charging time to a range between 20 to 40 minutes. However, the integration of FCS causes some adverse impacts on the Power Grid (PG), namely the huge increase in the peak demand during short periods of time. This paper addresses the design of power electronics converters for an EV DC FCS with local storage capability and easy interface of renewables. In the proposed architecture, the energy storage capability is used to smooth the peak power demand and contributes to stabilize the PG. When integrated in a smart grid, the proposed architecture may even return some of the stored energy back to the PG. The accomplishment of the aforementioned objectives requires a set of different power electronics converters, described and discussed along the paper. In order to demonstrate the potentialities of the proposed EV DC FCS architecture, four different case studies were analysed.

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“…The first is to minimize the peak under the constraint that all charging requirements have to be fulfilled. This can be realized in different ways, like the use of an intelligent charging control [1,2], of stationary batteries [3,4], of vehicle-to-grid (V2G) technology [5][6][7], or of dynamic pricing strategies [8][9][10]. A drawback of such methods is that, even though the peak load is minimized, it can still be in an undesirably high range.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Optimization-Based EV Charging Scheduling with Load Limit in a Realistic Scenario

Limmer

2019

Energies

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In the literature, optimization-based approaches are frequently proposed for the control of electric vehicle charging. However, they are usually evaluated under simplifying assumptions and are not compared to more simple approaches. The present work compares optimization-based approaches with rule-based ones in a simple but realistic scenario, in which a certain limit for the total load has to be satisfied. The scenario is based on the situation at an office building in Germany. In simulation experiments, different control approaches are evaluated not only in terms of pure performance but also from an economic perspective. The results indicate that, although the optimization-based approaches outperform the rule-based approaches, they are not always the right choice from an economic point of view.

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DC Fast-charging stations for EVs controlled by a local battery storage in low voltage grids

Cited by 16 publications

References 10 publications

Cost-benefit analysis of a novel DC fast-charging station with a local battery storage for EVs

Cost-benefit analysis of a novel DC fast-charging station with a local battery storage for EVs

Power Electronics Converters for an Electric Vehicle Fast Charging Station with Energy Storage System and Renewable Energy Sources

Evaluation of Optimization-Based EV Charging Scheduling with Load Limit in a Realistic Scenario

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